Important Questions – Page 10

TN Board 11th Computer Science Important Questions Chapter 5 Working with Typical Operating System (Windows & Linux)

October 21, 2021

TN State Board 11th Computer Science Important Questions Chapter 5 Working with Typical Operating System (Windows & Linux)

Question 1.
What is an operating system?
Answer:
An Operating System (OS) is a system software that enables the hardware to communicate and operate with other software. It also acts as an interface between the user and the hardware and controls the
overall execution of the computer.

Question 2.
What is Desktop?
Answer:
The opening screen of Windows is called ‘Desktop’. The desktop shows the Start button, Taskbar, Notification Area and date and time.

Question 3.
What is an Icon?
Answer:
Icon is a graphic symbol representing the window elements like files, folders, shortcuts etc., It plays a vital role in GUI based applications.

Question 4.
What is window?
Answer:
Window is a typical rectangular area in an application or a document. It is an area on the screen that displays information for a specific program.

Question 5.
What is Application Window?
Answer:
It is an area on a computer screen with defined boundaries and within which information is displayed. Such windows can be resized, maximized, minimized, placed side by side, overlap, and so on.

Question 6.
What is document window?
Answer:
The smaller window, which is inside the Application Window, is called the Document window. This Window is used for typing, editing, drawing, and formatting the text and graphics.

Question 7.
Where the task bar is located? What it contains?
Answer:
A horizontal bar at the bottom of the screen is called the taskbar. This bar contains (from left to right) the Start button, shortcuts to various programs, minimized programs and in the extreme right comer you can see the system tray which consist of volume control, network, date and time etc. Next to the Start button is the quick Launch Toolbar which contains task for frequently used applications.

Question 8.
What is meant by multitasking?
Answer:
Multiple applications can execute simultaneously in Windows, and this is known as “multitasking”.

Question 9.
What is launcher?
Answer:
The vertical bar of icons on the left side of the desktop is called the Launcher. The Launcher provides easy access to applications, mounted devices and the Trash. All current applications on your system will place an icon in the Launcher.

Question 10.
How will you delete a file in Ubuntu OS?
Answer:
A file / folder created by user can be moved to j trash by using right click or by using menu.

Question 11.
Define Ubuntu.
Answer:
Ubuntu is a Linux-based operating system. It is designed for computers, smartphones and network servers. The system is developed by a UK based company called Canonical Ltd.
Ubuntu was conceived in 2004 by Mark Shuttleworth, a successful South African entrepreneur.

Question 12.
Define Trash.
Answer:
Trash is the equivalent of Recycle bin of windows OS. All the deleted files and folders are moved here.

Question 13.
List the functions of an operating system.
Answer:

Memory Management
Process Management
Device Management
File Management
Security Management
Control overall system performance
Error detecting aids
Coordination between other software and users.

Question 14.
Write some of the most popular operating systems.
Answer:

Windows Series – for desktop and laptop computers.
Android – for smart phones.
iOS – for Apple phones, i-Pad and i-Pod.
Linux – Open source Operating System for desktop and server.

Question 15.
Write down the various mouse actions.
Answer:

Action	Reaction
Point to an item	Move the mouse pointer over the item.
Click	Point to the item on the screen, press and release the left mouse button.
Right click	Point to the item on the screen, press and release the right mouse button. Clicking the right mouse button displays a pop up menu with various options.
Double click	Point to the item on the screen, quickly press twice the left mouse button.
Drag and drop	Point to an item then hold the left mouse button as you move the pointer and when you have reached the desired position, release the mouse button.

Question 16.
Explain the icons in windows operating system.
Answer:
Icon:
It is a graphic symbol representing the window elements like files, folders, shortcuts etc. It plays a vital role in GUI based applications.

Standard Icons:
The icons which are available on desktop by default while installing Windows OS are called standard icons. The standard icons available in all Windows OS are My Computer, Documents and Recycle Bin.

Shortcut Icons:
It can be created for any application or file or folder. By double clicking the icon, the related application or file or folder will open. This represents the shortcut to open a particular application.

Disk drive icons:
The disk drive icons graphically represent five disk drive options.

Hard disk
CD-ROM/DVD Drive
Pen drive
Other removable storage such as mobile, smart phone, tablet etc.,
Network drives if your system is connected with other system.

Question 17.
Write the difference between the application window and the document window.
Answer:

Application Window	Document Window
The larger window is called the Application Window.	The smaller window, which is inside the Application Window is called the Document Window.
This window helps the user to communicate with the Application Program.	This window is used for typing, editing, drawing and formatting the text and graphics.

Question 18.
Write the ways of creating folders in windows.
Answer:
Method I:
Step 1: Open Computer Icon.
Step 2: Open any drive where you want to create a new folder. (For example select D:)
Step 3: Click on File → New → Folder.
Step 4: A new folder is created with the default name “New folder”.
Step 5: Type in the folder name and press Enter key.

Method II:In order to create a folder in the desktop:
Step 1: In the Desktop, right click → New → Folder.
Step 2: A Folder appears with the default name “New folder” and it will be highlighted.
Step 3: Type the name you want and press Enter Key.
Step 4: The name of the folder will change.

Question 19.
Write the steps to delete a file or folders in windows.
Answer:
Select the file or folder you wish to delete.
(i) Right-click the file or folder, select Delete option from the pop-up menu or Click File → Delete or press Delete key from the keyboard.
(ii) The file will be deleted and moved to the Recycle bin.

Question 20.
Write short note on Recycle Bin.
Answer:
Recycle bin is a special folder to keep the files or folders deleted by the user, which means user still have an opportunity to recover them. The user cannot access the files or folders available in the Recycle bin without restoring it. To restore file or folder from the Recycle Bin.

Open Recycle bin.
Right click on a file or folder to be restored and select Restore option from the pop-up menu.
To restore multiple files or folders, select Restore all items.
To delete all files in the Recycle bin, select Empty the Recycle Bin.

Question 21.
Write the steps to create shortcuts on the Desktop.
Answer:
Shortcuts to your most often used folders and files may be created and placed on the Desktop to help automate your work.

Select the file or folder that you wish to have as a shortcut on the Desktop.
Right click on the file or folder.
Select Send to from the shortcut menu, then select Desktop (create shortcut) from the sub-menu.
A shortcut for the file or folder will now appear on your desktop and you can open it from the desktop in the same way as any other icon.

Question 22.
Write the significant features of Ubuntu.
Answer:

The desktop version of Ubuntu supports all normal software like Windows such as Firefox, Chrome, VLC, etc.
It supports the office suite called LibreOffice.
Ubuntu has in-built email software called Thunderbird, which gives the user access to email such as Exchange, Gmail, Hotmail, etc.
There are free applications for users to view and edit photos, to manage and share videos.
It is easy to find content on Ubuntu with the smart searching facility.
The best feature is, it is a free operating system and is backed by a huge open source community.

Question 23.
What is Ambiance?
Answer:
The default desktop background, or wallpaper, belonging to the default Ubuntu 16.04 theme is known as Ambiance.

Question 24.
Write the steps to create files in the windows.
Answer:
Wordpad is an in-built word processor application in Windows OS to create and manipulate text documents.
In order to create files in wordpad you need to follow the steps given below.

Click Start → All Programs → Accessories → Wordpad or Run → type Wordpad, click OK. Wordpad window will be opened.
Type the contents in the workspace and save the file using File → Save or Ctrl + S.
Save As dialog box will be opened.
In the dialog box, select the location where you want to save the file by using look in drop down list box.
Type the name of the file in the file name textbox.
Click save button.

Question 25.
Draw and explain the elements of windows.
Answer:
Title Bar:
The title bar will display the
name of the application and the name of the document opened. It will also contain minimize, maximize and close button.

Menu Bar:
The menu bar is seen under the title bar. Menus in the menu bar can be accessed by pressing Alt key and the letter that appears underlined in the menu title. Additionally, pressing Alt or F10 brings the focus on the first menu of the menu bar.
In Windows 7, in the absence of the menu bar, click Organize and from the drop down menu, click the Layout option and select the desired item from that list.

The Workspace:
The workspace is the area in the document window to enter or type the text of your document.

TN State Board 11th Computer Science Important Questions Chapter 5 Working with Typical Operating System (Windows & Linux) 2

Scroll bars:
The scroll bars are used to scroll the workspace horizontally or vertically. Comers and borders:The comers and borders of the window helps to drag and resize the windows. The mouse pointer changes to a double headed arrow when positioned over a border or a comer. Drag the border or comer in the direction indicated by the double headed arrow to the desired. The window can be resized by dragging the comers diagonally across the screen.

Question 26.
Write the steps to log off / shut down the computer.
Answer:
(i) Click start → log off (click the arrow next to Shut down) or Start → Shutdown.
(ii) If any programs are opened, then it will be asked to close them or windows will Force shut down, user will lose any un saved information if you do this.
(iii) Switch User: Switch to another user account on the computer without closing open programs and Windows processes.
(iv) Log Off: Switch to another user account on the computer after closing all open programs and Windows processes.
(v) Lock: Lock the computer while you’re away from it.
(vi) Restart: Reboot the computer. (This option is often required as part of installing new software or Windows update.)
(vii) Sleep: Puts the computer into a low- power mode that retains all miming programs and open Windows in computer memory for a super-quick restart.
(viii) Hibernate (found only on laptop computers): Puts the computer into a low-power mode after saving all miming programs and open windows on the machine’s hard drive for a quick restart.

Question 27.
Explain the different method of renaming files and folders.
Answer:
There are number of ways to rename files or folders. You can rename using the File menu, left mouse button or right mouse button.
Method I: Using the FILE Menu

Select the File or Folder to Rename.
Click File → Rename.
Type in the new name.
To finalise the renaming operation, press Enter.

Method II:Using the Right Mouse Button

Select the file or folder to rename.
Click the right mouse button over the file or folder.
Select Rename from the pop-up menu.
Type in the new name.
To finalise the renaming operation, press Enter.
The folder “New Folder” is renamed as C++.

Method III: Using the Left Mouse Button

Select the file or folder to rename.
Press F2 or click over the file or folder. A surrounding rectangle will appear around the name.
Type in the new name.
To finalise the renaming operation, press Enter.

Question 28.
What are the different method of copying files and folders to removable disk.
Answer:
There are several methods of transferring files to or from a removable disk.
(i) Copy and Paste
(ii) Send To

Method I: Copy and Paste
(a) Plug the USB flash drive directly into an available USB port.
(b) If the USB flash drive or external drive folder does NOT open automatically, the following steps are followed.
(c) Click Start → Computer.
(d) Double-click on the Removable Disk associated with the USB flash drive.
(e) Navigate to the folders in computer containing files to be transfered.

Right-click on the file to copy, then select Copy.
Return to the Removable Disk window, right- click within the window, then select Paste.

Method II: Send To
(a) Plug the USB flash drive directly into an available USB port.
(b) Navigate to the folders in computer containing files to be transfered.
(c) Right-click on the file transfer to removable disk.
(d) Click Send To and select the Removable Disk associated with the USB flash drive.

Question 29.
Explain the indicators in the menubar of Ubuntu OS.
Answer:
(i) Network indicator:
This manages network connections, allowing user to connect to a wired or wireless network.

(ii) Text entry settings:
This shows the current keyboard layout (such as En, Fr,Ku, and so on) . If more than one keyboard layout is shown, it allows to select a keyboard layout out of those choices. The keyboard indicator menu contains the following menu items: Character Map, Keyboard Layout Chart, and Text Entry Settings.

(iii) Messaging indicator:
This incorporates your social applications. From here, user can access instant messenger and email clients.

(iv) Sound indicator:
This provides an easy way to adjust the volume as well as access the music player.

(v) Clock:
This displays the current time and provides a link to calendar and time and date settings.

(vi) Session indicator:
This is a link to the system settings, Ubuntu Help and session options (like locking your computer, user/guest session, logging out of a session, restarting the computer or shutting down completely).

(vii) Title bar:
The title bar shows the name of the currently selected directory. It also contains the Close, Minimize, and Maximize buttons.

(viii) Toolbar:
The toolbar displays user directory browsing history (using two arrow buttons), location in the file system, a search button and options for current directory view.

Question 30.
How will you move files and folders?
Answer:
Method I: CUT and PASTE
To move a file or folder, first select the file or
folder and then choose one of the following:
(i) Click on the Edit → Cut or Ctrl + X or right click → cut from the pop-up menu.
(ii) To move the filets) or folder(s) in the new location, navigate to the new location and paste it using Click Edit → Paste from edit menu or Ctrl + V using keyboard.
(in) Or Right click → Paste from the pop-up menu. The file will be pasted in the new location.

Method II: Drag and Drop
In the disk drive window, there are two panes called left and right panes. In the left pane, the files or folders are displayed like a tree structure. In the right pane, the files inside the specific folders in the left pane are displayed with various options.

(i) In the right pane of the Disk drive window, select the file or folder to be moved.
(ii) Click and drag the selected file or folder from the right pane, to the folder list on the left pane.
(iii) Release the mouse button when the target folder is highlighted (active).
(iv) File or folder will now appear in the new area.

Question 31.
How will you copy files and folders in windows?
Answer:
There are variety of ways to copy files and folders:
Method I: COPY and PASTE
To copy a file or folder, first select the file or folder and then choose one of the following:
(i) Click Edit → Copy or Ctrl + C or right click → Copy from the pop-up menu.
(ii) To paste the file(s) or folder(s) in the new location, navigate to the target location then do one of the following:
(iii) Click Edit → Paste or Ctrl + V.
(iv) Or Right click → Paste from the pop-up menu.

Method II: Drag and Drop
(i) In the RIGHT pane, select the file or folder to be copied.
(ii) Click and drag the selected file and/or folder to the folder list on the left, and drop it where to copy the file and/or folder.
(iii) File(s) and folder(s) will now appear in the new area.

Question 32.
Start the application Wordpad using Start menu and Run option.
Answer:
Click, Run option on the Start menu, the Run dialog box appears. Type the “Word Pad” in the open window box, then press OK button. Now, wordpad window is opened.
Close the Wordpad application using File
menu.
Click, File → Exit (or) File → Close.

Question 33.
Create a Folder in My Documents with your name using any one of the methods discussed.
Answer:
(i) Open My Computer or Computer icon.
(ii) Open any drive where you want to create a new folder, (eg: select D drive)
(iii) Click on File → New → Folder.
(iv) Now, a new folder is created with the default name “New Folder”.
(v) Type in the New Folder for your name and press Enter key. Now, Folder name created for you name.

Question 34.
Open the Wordpad application and save it under a folder created with your name in My Document.
Answer:

Click Start → All programs → Accessories → Wordpad (or) Run → type Wordpad, click OK. Wordpad window will be opened.
Type the contents in the workspace and save the file using File → save or Ctrl + S.
Save As dialog box will be opened.
In this dialog box, select the drive name and folder name, where you want to save the file.
Now, type the name of the file in the file name text box.
Click save button.

Question 35.
Find the file created in Workshop-3 using the above procedure.
Answer:

Click computer icon from desktop or from start menu.
The computer disk drive screen will be appear and at the top right comer of that screen, there is a search box.
Type the name of File / Folder you want I to search. Even if you give the part of the File or Folder name. It will displays the list of files or folders starting with the specified name.
Just click and open that file or the folder.

Question 36.
Rename the file created by you using the File menu, left mouse button or right mouse button.
Answer:
Method 1:

Select the file or folder to Rename.
Click File → Rename.
Type in the new name as you desired.
Press Enter key.

Method 2:

Select the file or folder to rename.
Click the right mouse button over the file or folder.
Select Rename from the pop-up menu.
Type in the new name.
Press Enter key.

Question 37.
Find the file created in Workshop-3 using the above procedure.
Answer:

Click computer icon from desktop or from start menu.
The computer disk drive screen will be appear and at the top right comer of that screen, there is a search box.
Type the name of File / Folder you want I to search. Even if you give the part of the File or Folder name. It will displays the list of files or folders starting with the specified name.
Just click and open that file or the folder.

Question 38.
Rename the file created by you using the File menu, left mouse button or right mouse button.
Answer:
Method 1:

Select the file or folder to Rename.
Click File → Rename.
Type in the new name as you desired.
Press Enter key.

Method 2:

Select the file or folder to rename.
Click the right mouse button over the file or folder.
Select Rename from the pop-up menu.
Type in the new name.
Press Enter key.

Question 39.
Move the file created by you in My Documents to Drive D:.
Answer:
There are variety of ways to copy files and folders.
Drag and drop method:

Open computer icon.
In the disk drive window, there are two panes called left and right panes. In the left pane, the files or folders are displayed like a tree structure. In the right pane, the files inside the specific folders in the left pane are displayed with various options.
In the right pane of the disk drive window, select My Documents with created your file name.
Click filename and drag to drive D: in the left pane.
Release the mouse button, now file name is moved from My Documents to Drive D.
Drive D: to a removable Disk.

* Copy the file created by you from drive D: to a removable disk.

Plug the USB flash drive directly into an available USB port, (or)
Click start → Computer.
Click Drive D: Select file name you want to move.
Click the right mouse button, send to option and select the Removable Disk with the USB flash drive.

Question 40.
Delete the file created by you after duplicating the same under My Documents.
Answer:

Select My Documents, then click to delete.
Right-click the file created. Select Delete Option from the pop-up menu (or) Click File → Delete (or) Press Delete key from the keyboard.
The file will be deleted from the My Documents and moved to the Recycle bin.

Question 41.
Differentiate cut and copy options.
Answer:

Cut	Copy
When an object is cut from a document it is completely removed and placet into a clipboard.	When an object is copied a duplicate of it is placed into a clipboard while the original remains in place.
Ctrl + X and Ctr + V is the shortcul command for cul and paste.	Ctrl + C and Ctrl + V is the shortcul command for copy and paste.

Question 42.
What is the use of a file extension?
Answer:
The extension of the file name simply says the format in which the data in the file is stored.
Eg: If a file is named letter.doc, the .doc is the file extension, and it tells windows that

Question 43.
Differentiate Files and Folders.
Answer:

Files	Folders
A file is a collection of data on a single unit. It can be anything from a word file to a music, video or photo file.	Folders are places where files are stored. Folders can contain folders inside them.
Files have a size ranging from a few bytes to several giga bytes.	Folders take up no space on hard drive.

Question 44.
Differentiate save and save as option.
Answer:

Save	Save as
The ‘save’ simply saves our work by updating the Iasi saved version o1 the file to match the current version we see on our screen.	The ‘save as’ brings upto save our work as a file with a different name.

Question 45.
What is Open Source?
Answer:

Open Source refers to a program or software in which the source code is available in the web to the general public free of cost.
Open Source code is typically created as a collaborative effort in which programmers continuously improve upon the source code in the web and share the changes within the community.

Question 46.
What are the advantages of open source?
Answer:
The advantages of open sources are better security, better quality, more control, no vendor dependence, easier licence management.

Question 47.
Mention the different server distributions in Linux OS.
Answer:

Ubuntu Linux
Linux Mint
Arch Linux
Deepin
Fedora
Debian
CentOS

Question 48.
How will you log off from Ubuntu OS?
Answer:
When you have finished working on your computer, you can choose to Log Out, Suspend or Shut down through the Session Indicator on the far right side of the top panel.

Question 49.
Analyse:
Why the drives are segregated?
Answer:
A drive is a computer component used to store data. Partitioning a hard drive essentially tells the computer to treat portions of that drive as separate entities. It can be for a variation for reasons, keeping things organized, creating a backup and recovery partition.

(i) Multiple file systems:
If we require
different file systems on our computer for specific action then we make multiple partition and assign one type of file system to one of the partitions and another to one of the other partitions.

(ii) Partition size:
If we have more storage space on a hard drive, we would need to create other partitions, to utilize this unused space.

(iii) Multiple operating system:
If we went to use two operating systems on the same computer then we could make two partitions, one for each operating system.

(iv) Wasted disk space:
By having multiple partitions of smaller size, we can reduce the amount of waste that file systems may create.

(v) Separate system files from users files:
By creating a partition we can store system files in one partition and users data to another partition to avoid causing problem.

Question 50.
If you are working on multiple files at a time, sometimes the system may hang. What is the reason behind it. How can you reduce it?
Answer:
When each program or files are opened, computer takes some of the computer resources to keep it running. If too many programs are opened to one time, computer If we have too many programs open at one time, our computer may be low on resources and it slows down or it may hang. Try only one program running at a time to make sure our hang-ups is not being caused by multiple programs running at the same time.

To determine computer in this situation is by pressing the Num Lock button on the keyboard and watching the Num Lock to see if it turns off and on. To get the light to turn off and on, press Ctrl + Alt + Del and End Task for the hang-up files.

Question 51.
Are drives such as hard drive and floppy drives represented with drive letters? If so why, if not why?
Answer:
The drive letters plays an important role in telling windows where to look. All the computers with a hard drive will always have that default hard drive assigned to a C: and for floppy drivers has a drive letter of A:.

Question 52.
Write the specific use of Cortana.
Answer:
Cortana – the personal assistant feature from windows phone. This has become a major part of windows 10 doing double duty as a web search and a start merfu / windows search. Plus the ability to search by voice.
Uses:
(i) It is used to set reminder in our PC.
(ii) It can alert you whenever you miss a call on your phone.
(iii) It can also help find the latest news.

Question 53.
List out the major differences between Windows and Ubuntu OS.
Answer:

Windows OS	Ubuntu OS
It is a GUI based operating system.	It is a Linux based operating system.
It is a closed source (proprietary software).	It is an open source operating system.
It is strictly Microsoft company based.	It is based around the company canonical and is also community based.

Question 54.
Are there any difficulties you face while using Ubuntu? If so, mention it with reasons.
Answer:
Yes, Many difficulties are there while using Ubuntu operating system.

A lack of familiarity and shared experiences fragments users they do not have a shared any points.
Many Linux newbies start with Ubuntu. This should not take away from Ubuntu, it is a testament to its smart design and ease of use.
Ubuntu has come a long way regarding hardware compatibility and some accessory hardware will not have the needed software to interface.

Question 55.
Differentiate Thunderbird and Firefox in Ubuntu OS.
Answer:

Thunderbird	Firefox
Ubuntu has in – built email software called Thunderbird.	Firefox is a internet browser, you can directly browse the internet.
It gives the user Access to email such as Gmail, Hotmail etc.,	It is the fastest browser and numerous features that protect you, from viruses and other common exploits.
There are free applications for users to view and edit photos, to manage and share videos.	Fire fox has some advanced security measures that guard against the spyware and viruses.

Question 56.
Differentiate Save, Save As and Save a Copy in Ubuntu OS.
Answer:
Save:
This will save the document without asking for a new name or location. It will over-write the original.

SaveAs:
This will prompt user to save the document using a dialog box. User will have the ability to change the file name or location.

Save a Copy:
This will prompt user to save a copy using the same dialog box as save as. User will have the ability to change the file name or location. If the name or location of the document is changed user will be working on the original document not the copy. That means if user make additional changes and then hit save the original will be overwritten with new changes, but the copy user saved earlier will be left at the state of the ‘save a copy.

Question 57.
Explain the versions of Windows Operating System.
Answer:

TN State Board 11th Computer Science Important Questions Chapter 5 Working with Typical Operating System (Windows & Linux) 1

TN State Board 11th Computer Science Important Questions Chapter 5 Working with Typical Operating System (Windows & Linux) 2

TN State Board 11th Computer Science Important Questions Chapter 5 Working with Typical Operating System (Windows & Linux) 3

Question 58.
Draw and compare the icon equivalence in Windows and Ubuntu.
Answer:

TN State Board 11th Computer Science Important Questions Chapter 5 Working with Typical Operating System (Windows & Linux) 4

Question 59.
Complete the following matrix:
Answer:

Navigational method	Located on	Ideally suited for
Start Button	Task bar	Quick access to common applications and settings.
My Computer	Desktop	Exploring your disk drives and using system tools.
Windows Explorer	Task bar	Seeing hierarchy of all computer contents and resources in one window.
Quick Launch	Task bar	Enables a user the ability to launch their programs.

Question 60.
Observe the figure and mark all the window elements. Identify the version of the Windows OS.
Answer:

TN State Board 11th Computer Science Important Questions Chapter 5 Working with Typical Operating System (Windows & Linux) 5

All the Window elements are same. The version of OS is Windows 10.

Question 61.
Write the procedure to create, rename, delete and save a file in Ubuntu OS. Compare it with Windows OS.
Answer:
The procedure to create, rename, delete and save a file in Ubuntu OS is similar to windows OS. User can create, rename, delete and save the files and folders with the same procedure by clicking files icon. The some related figure on the desktop represents creating a file or folder by right clicking in the Desktop.
A New Folder can also be created by using menus in the files icon.
A document created by user can be moved to ‘trash’ by using right click or by using menus as in windows.
All the other options like rename, cut, copy can be performed by using right click or by using menus as windows.

Choose the correct answer:

Question 1.
Microsoft windows is a based operating system.
(a) GUI
(b) command driven
(c) window
(d) menu driven
Answer:
(a) GUI

Question 2.
Multiple applications which can execute simultaneously in windows is known as :
(a) multi programming
(b) multi tasking
(c) time sharing
(d) based on priority
Answer:
(b) multi tasking

Question 3.
________ is used to interact windows by clicking its elements.
(a) Keyboard
(b) Light pen
(c) Mouse
(d) Scanner
Answer:
(c) Mouse

Question 4.
_______ is used to enter alphabets and characters.
(a) Light pen
(b) Mouse
(c) Notes taker
(d) Keyboard
Answer:
(d) Keyboard

Question 5.
Multiple desktop is available in :
(a) windows XP
(b) windows vista
(c) windows 8
(d) windows 10
Answer:
(d) windows 10

Question 6.
The opening screen of windows is called :
(a) desktop
(b) icons
(c) windows
(d) documents
Answer:
(a) desktop

Question 7.
The __________ is an area on the screen that displays information for a specific program.
(a) desktop
(b) icons
(c) window
(d) document
Answer:
(c) window

Question 8.
The larger window is called the:
(a) document window
(b) application window
(c) workspace
(d) scroll bar
Answer:
(b) application window

Question 9.
The first level in a multilevel or hierarchical directory system is:
(a) root directory
(b) additional directory
(c) sub directories
(d) directories
Answer:
(a) root directory

Question 10.
The shortcut keyboard command to cut is:
(a) Ctrl + X
(b) Ctrl + C
(c) Ctrl + V
(d) Ctrl + S
Answer:
(a) Ctrl + X

Question 11.
The shortcut keyboard command to copy is:
(a) Ctrl + X
(b) Ctrl + C
(c) Ctrl + V
(d) Ctrl + S
Answer:
(b) Ctrl + C

Question 12.
The shortcut keyboard command to paste is:
(a) Ctrl + X
(b) Ctrl + C
(c) Ctrl + V
(d) Ctrl + A
Answer:
(c) Ctrl + V

Question 13.
The paste option is on ______ menu.
(a) edit
(b) file
(c) view
(d) tools
Answer:
(a) edit

Question 14.
______ switches to another user account on the computer without closing the open programs and windows processes.
(a) Log off
(b) Restarting the computer
(c) Shut down
(d) Switch user
Answer:
(d) Switch user

Question 15.
__________ shows the name of the currently selected directory.
(a) Tool bar
(b) Menu bar
(c) Task bar
(d) Title bar
Answer:
(d) Title bar

Question 16.
__________ displays your directory browsing history, location in the file system, a search button and options for the current directory view.
(a) Tool bar
(b) Menu bar
(c) Task bar
(d) Title bar
Answer:
(a) Tool bar

Question 17.
Windows 7 was released in :
(a) October 2012
(b) September 2014
(c) October 2009
(d) October 2015
Answer:
(c) October 2009

Question 18.
A horizontal bar at the very bottom of the screen is called the:
(a) tool bar
(b) menu bar
(c) task bar
(d) title bar
Answer:
(c) task bar

Question 19.
We can select multiple files by holding down the _____ key.
(a) Alt
(b) Shift
(c) Ctrl
(d) Home
Answer:
(c) Ctrl

Question 20.
________ is located at the top of the screen.
(a) Tool bar
(b) Menu bar
(c) Task bar
(d) Title bar
Answer:
(b) Menu bar

Question 21.
The graphic symbol representing the window elements is:
(a) Icon
(b) Desk
(c) Start
(d) Task
Answer:
(a) Icon

Question 22.
Which shortcut key is used to move the desktop anytime?
(a) Winkey + M
(b) Winkey + V
(c) Winkey + D
(d) Winkey + C
Answer:
(c) Winkey + D

Question 23.
Which is not available in the windows standard icon?
(a) My computer
(b) Documents
(c) Recycle Bin
(d) Paint icon
Answer:
(d) Paint icon

Question 24.
Shortcut icons can be created for any:
(a) application
(b) file
(c) folder
(d) all the above
Answer:
(d) all the above

Question 25.
How many disk drive options are graphically represented?
(a) 2
(b) 3
(c) 4
(d) 5
Answer:
(d) 5

Question 26.
Which is known as typical rectangular area in an application or a document?
(a) Window
(b) Icon
(c) Disk
(d) Drive
Answer:
(a) Window

Question 27.
Which will display the name of the application and name of the document in the window?
(a) Title bar
(b) Menu bar
(c) Task bar
(d) Scroll bar
Answer:
(a) Title bar

Question 28.
Which key is pressed in the menus that appears underlined in the menu title?
(a) Ctrl key
(b) Alt key
(c) Shift key
(d) Home key
Answer:
(b) Alt key

Question 29.
Which is the area in document window to type the text?
(a) Document window
(b) Application window
(c) Work space
(d) Desktop
Answer:
(c) Work space

Question 30.
The smaller window, which is inside the application window is called the:
(a) document window
(b) application window
(c) work space
(d) desktop
Answer:
(a) document window

Question 31.
The title bar will display the name of the:
(a) file
(b) document
(c) directory
(d) program
Answer:
(b) document

Question 32.
Which bars are used to scroll the workspace horizontally or vertically?
(a) Title bar
(b) Task bar
(c) Scroll bar
(d) Menu bar
Answer:
(c) Scroll bar

Question 33.
Which changes to a double headed arrow when positioned over a border or a comer?
(a) Mouse pointer
(b) Enter key
(c) Arrow keys
(d) Mouse click
Answer:
(a) Mouse pointer

Question 34.
Write the order from left to right in the taskbar contains:
(1) Network icon
(2) Volume adjustment
(3) Default language
(4) Time and Date
(a) 1, 3, 4 and 2
(b) 3, 1, 2 and 4
(c) 1, 4, 3 and 2
(d) 1, 2, 3 and 4
Answer:
(b) 3, 1, 2 and 4

Question 35.
Which icon is used by windows 8 and 10 instead of My computer icon?
(a) Computer icon
(b) PC icon
(c) This PC icon
(d) My system icon
Answer:
(c) This PC icon

Question 36.
To quit an application of document click on:
(a) File → Exit
(b) File → Close
(c) ☒ Close button
(d) All the above
Answer:
(d) All the above

Question 37.
Which is an in-built word processor application in windows OS?
(a) MS word
(b) Wordpad
(c) Star writer
(d) Libre office writer
Answer:
(b) Wordpad

Question 38.
Which box on the start menu can be used to quickly search a particular folder or file in the computer?
(a) Search
(b) Find
(c) Seek
(d) Look in
Answer:
(a) Search

Question 39.
Which is the most common way of opening a file or a folder?
(a) Open
(b) Double-click
(c) Click
(d) Right click
Answer:
(b) Double-click

Question 40.
Which function key is used to change the file name or folder for selected?
(a) F1
(b) F2
(c) F3
(d) F4
Answer:
(b) F2

Question 41.
Which combination of keys are used to select multiple files or folders?
(a) Alt + Click
(b) Alt + Enter
(c) Ctrl + Click
(d) Ctrl + Enter
Answer:
(c) Ctrl + Click

Question 42.
Which keys are used to delete a file or folder permanently?
(a) Shift + Delete
(b) Shift + Enter
(c) Ctrl + Delete
(d) Ctrl + Enter
Answer:
(a) Shift + Delete

Question 43.
Recycle bin is a:
(a) folder
(b) box
(c) drive
(d) program
Answer:
(a) folder

Question 44.
Most often used folders and files may be created on the desktop in:
(a) Copy
(b) Send
(c) Shortcut
(d) Move
Answer:
(c) Shortcut

Question 45.
Which button is used to switch to another user account on the computer without closing existing account?
(a) Switch user
(b) Log off
(c) Lock
(d) Sleep
Answer:
(a) Switch user

Question 46.
Switch to another user account after closing all your open programs, if you do this:
(a) Switch user
(b) Log off
(c) Lock
(d) Sleep
Answer:
(b) Log off

Question 47.
Puts the computer into a low-power mode after saving all running programs is:
(a) Hibernate
(b) Sleep
(c) Log off
(d) Lock
Answer:
(a) Hibernate

Question 48.
Which is one of the popular Open Source versions of the UNIX operating system?
(a) LINUX
(b) MS-DOS
(c) Windows
(d) XENIX
Answer:
(a) LINUX

Question 49.
Which OS is designed for computers, smartphones and network servers?
(a) MS-DOS
(b) Uhuntu
(c) Windows
(d) UNIX
Answer:
(b) Uhuntu

Question 50.
When was Ubuntu OS conceived?
(a) 2001
(b) 2002
(c) 2003
(d) 2004
Answer:
(d) 2004

Question 51.
Who was the successful entrepreneur of Ubuntu?
(a) Mark Shuttleworth
(b) Mark Wagh
(c) John Mauchly
(d) Engelbart
Answer:
(a) Mark Shuttleworth

Question 52.
Which is the in-built email software in Ubuntu?
(a) Thunderbird
(b) Yahoo
(c) Gmail
(d) Hotmail
Answer:
(a) Thunderbir

Question 53.
Which is the default desktop background or wallpaper in Ubuntu?
(a) Natural
(b) Ambiance
(c) Elephant
(d) Peacock
Answer:
(b) Ambiance

Question 54.
Which is known as equivalent to taskbar in Ubuntu?
(a) Launcher
(b) Device
(c) Trash
(d) VBox
Answer:
(a) Launcher

Question 55.
All current applications on your system will place an icon in the:
(a) Device
(b) Launcher
(c) Trash
(d) VBox
Answer:
(b) Launcher

Question 56.
Which icon is equivalent of recycle bin of windows OS?
(a) Trash
(b) Device
(c) Launcher
(d) Vbox
Answer:
(a) Trash

Question 57.
Match the following:

(i) Windows series	(a) For Apple phones, I – pad and I – pod.
(ii) Android	(b) For Desktop and Laptop computers
(iii) iOS	(c) For smart phones
(iv) Linux	(d) Open source Operating System for desktop and server.

(a) (i) – (b); (ii) – (c); (iii) – (a); (iv) – (d)
(b) (i) – (a); (ii) – (b); (iii) – (c); (iv) – (d)
(c) (i) – (b); (ii) – (a); (iii) – (c); (iv) – (d)
(d) (i) – (d); (ii) – (a); (iii) – (b); (iv) – (c)
Answer:
(a) (i) – (b); (ii) – (c); (iii) – (a); (iv) – (d)

Question 58.
Match the following:

(i) Windows 3.x	(a) 2001
(ii) Windows Me	(b) 2006
(iii) Windows XP	(c) 2000
(iv) Windows Vista	(d) 1992

(a) (i) – (d); (ii) – (c); (iii) – (a); (iv) – (b)
(b) (i) – (b); (ii) – (c); (iii) – (a); (iv) – (d)
(c) (i) – (c); (ii) – (d); (iii) – (b); (iv) – (a)
(d) (i) – (b); (ii) – (c); (iii) – (d); (iv) – (a)
Answer:
(a) (i) – (d); (ii) – (c); (iii) – (a); (iv) – (b)

Question 59.
Choose the incorrect pair:

Column – I	Column – II
(a) Windows NT	Designed to act as servers in network.
(b) Windows 8	Served as common platform for mobile and computer.
(c) Windows 7	Multiple desktop
(d) Windows XP	Introduced 64 – bit processor.

Answer:
(c)

Question 60.
Choose the correct pair:

Column – I	Column – II
(a) Menu bar	Displays the name of the application.
(b) Work space	Telps to drag and resize the windows.
(c) Computer icon	We can start any application.
(d) Task bar	Contains shortcuts to /various programs.

Answer:
(d)

Question 61.
Choose the odd man out:
(a) Ctrl + X
(b) Ctrl + C
(c) Ctrl + S
(d) Ctrl + V
Answer:
(c) Ctrl + S

Question 62.
Assertion (A):
Recycle bin is a special folder to keep the files or folders deleted by the user.
Reason (R):
We can still have an opportunity to recover them.
(a) Both A and R are true, and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Answer:
(a) Both A and R are true, and R is the correct explanation for A.

Question 63.
Match the following:

(i) Messaging indicator	(a) To adjust the volume
(ii) Sound indicator	(b) Access instant messenger and email clients.
(iii) Session indicator	(c) Manages the network connections.
(iv) Network indicator	(d) Link to the system settings.

(a) (i) – (d); (ii) – (b); (iii) – (c); (iv) – (a)
(b) (i) – (b); (ii) – (a); (iii) – (d); (iv) – (c)
(c) (i) – (a); (ii) – (b); (iii) – (c); (iv) – (d)
(d (i) – (b); (ii) – (c); (iii) – (a); (iv) – (d)
Answer:
(b) (i) – (b); (ii) – (a); (iii) – (d); (iv) – (c)

Question 64.
Identify the correct pair:

Column – I	Column – II
(a) Libre office writer	Similar to MS Excel
(b) Libre office calc	To prepare any presentation.
(c) Trash	Equivalent to Recycle bin.
(d) Tool bar	Contains Close, Minimize and Maximize buttons.

Answer:
(c)

Question 65.
Identify the incorrect pair:

Column – I	Column – II
(a) Launcher	Provides easy access to applications.
(b) Files	Equivalent to My computer icon.
(c) Software Icon	To add any additional applications.
(d) Menu bar	Displays the current time.

Answer:
(d)

Question 66.
Choose the odd man out.
(a) Libre office writer
(b) Libre office calc
(c) Libre office Impress
(d) MS power point
Answer:
(d) MS power point

Question 67.
Assertion (A):
The Menu bar is located at the top of the screen.
Reason (R):
Network indicator manages network connections.
(a) Both A and R are true, and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Answer:
(b) Both A and R are true, but R is not the correct explanation for A.

Question 68.
From the options given below, choose the operations managed by the operating system.
(a) memory
(b) processes
(c) disks and I/O devices
(d) all of the above
Answer:
(d) all of the above

Question 69.
Which is the default folder for many Windows Applications to save your file?
(a) My Document
(b) My Pictures
(c) Documents and Settings
(d) My Computer
Answer:
(a) My Document

Question 70.
Under which of the following OS, the option Shift + Delete – permanently deletes a file or folder?
(a) Windows 7
(b) Windows 8
(c) Windows 10
(d) None of the OS
Answer:
(a) Windows 7

Question 71.
What is the meaning of “Hibernate” in Windows XP/Windows 7?
(a) Restart the Computer in safe mode
(b) Restart the Computer in hibernate mode
(c) Shutdown the Computer terminating all the running applications
(d) Shutdown the Computer Without closing the running applications
Answer:
(d) Shutdown the Computer Without closing the running applications

Question 72.
Which of the following OS is not based on Linux?
(a) Ubuntu
(b) Redhat
(c) CentOs
(d) BSD
Answer:
(d) BSD

Question 73.
Which of the following in Ubuntu OS is used to view the options for the devices installed?
(a) Settings
(b) Files
(c) Dash
(d) VBox_GAs_5.2.2
Answer:
(d) VBox_GAs_5.2.2

Question 74.
Identify the default email client in Ubuntu:
(a) Thunderbird
(b) Firefox
(c) Internet Explorer
(d) Chrome
Answer:
(a) Thunderbird

Question 75.
Which is the default application for spreadsheets in Ubuntu? This is available in the software launcher.
(a) LibreOffice Writer
(b) LibreOffice Calc
(c) LibreOffice Impress
(d) LibreOffice Spreadsheet
Answer:
(b) LibreOffice Calc

Question 76.
Which is the default browser for Ubuntu?
(a) Firefox
(b) Internet Explorer
(c) Chrome
(d) Thunderbird
Answer:
(a) Firefox

Question 77.
Where will you select the option to log out, suspend, restart, or shut down from the desktop of Ubuntu OS?
(a) Session Indicator
(b) Launcher
(c) Files
(d) Search
Answer:
(a) Session Indicator

TN Board 11th Computer Science Important Questions

TN Board 11th Computer Science Important Questions Chapter 4 Theoretical Concepts of Operating System

October 21, 2021

TN State Board 11th Computer Science Important Questions Chapter 4 Theoretical Concepts of Operating System

Question 1.
What is a software?
Answer:
A software is set of instructions that perform specific task. It interacts basically with the hardware to generate the desired output.

Question 2.
Mention the types of software.
Answer:
Software is classified into two types:
(i) Application Software
(ii) System Software.

Question 3.
Define application software.
Answer:
Application software is a set of programs to perform specific task. Eg: MS-Word is an application software to Create text document and VLC player is familiar application software to play audio, video files and many more.

Question 4.
Define system software.
Answer:
System software is a type of computer program that is designed to run the computer’s hardware and application programs.
Eg: Operating System and Language Processor.

Question 5.
Define OS.
Answer:
An Operating System (OS) is a system software Which serves as an interface . between a user and a computer.

Question 6.
Write the key features of the operating system.Answer:
The key features of the operating system are:

User Interface
Memory Management
Process Management
Security Management
Fault Tolerance
File Management.

Question 7.
What is the main objective of memory management?
Answer:
The objective of Memory Management process is to improve both the utilization of the CPU and the speed of the computer ’s response to its users via main memory. The computers must keep several programs in main memory that associates with many different Memory Management schemes.

Question 8.
What is Garbage collection?
Answer:
Allocation and de-allocation of memory blocks as needed by the program in main memory is called Garbage collection.

Question 9.
How the processes are classified?
Answer:
A computer consists of a collection of processes, they are classified into two categories:

Operating System proc|sses which is executed by system code.
User Processes which is execute by user code.

Question 10.
Write the resources of a process.
Answer:
A process needs certain resources including CPU time, memory, files and I/O devices to finish its task.

Question 11.
What is Round Robin Scheduling?
Answer:
The Round Robin (RR) scheduling algorithm is designed especially for time sharing systems. Jobs (processes) are assigned and processor time in a circular method. Eg: Take three jobs A, B, C. First the job A is assigned to CPU then job B and job C and then again A, B and C and so on.

Question 12.
What is meant by fault tolerance?
Answer:
The Operating Systems should be robust. When there is a fault, the Operating System should not crash, instead the Operating System have fault tolerance capabilities and retain the existing state of system.

Question 13.
List the prominent operating system.
Answer:
Prominent OS are as follows:

UNIX
Microsoft Windows
Linux
iOS
Android.

Question 14.
What is Unix?
Answer:
UNIX is a family of multitasking, multi-user operating systems that derive originally from AT&T Bell Labs, where the development began in the 1970s by Ken Thompson and Dennis Ritchie.

Question 15.
What is iOS?
Answer:
iOS (formerly iPhone OS) is a mobile Operating System created and developed by Apple Inc., exclusively for its hardware. It is the Operating System that presently powers many of the company’s mobile devices, including the iPhone, iPad and iPod Touch. It is the second most popular mobile Operating System globally after Android.

Question 16.
What is meant by Error Log File?
Answer:
The user interface should reduce number of errors committed by the user with little practice the user should be in a position to avoid errors (Error Log File).

Question 17.
What is process?
Answer:
A process is the unit of work (program) in a computer. A word-processing program being run by an individual user on a computer is a process. A system task, such as sending output to a printer or screen, can also be called as a Process.

Question 18.
Expand the following FAT and NTFS.
Answer:
FAT – Be location Table.
NTFS – Nx Tgeneration Be System.

Question 19.
What are the popular operating systems used in personal computers and laptops?
Answer:
Popular operating systems used in personal computers and laptops are:- Windows, UNIX and Linux.

Question 20.
What is the need of operating system?
Answer:
It is an interface between the user and hardware.

Question 21.
Why operating system works as translator?
Answer:
Operating system translates the user request into machine language (Binary language), processes it and then sends it back to operating systems.

Question 22.
Why is Linux called open source operating systems?
Answer:
It can be modified and distributed by anyone around the world. The main advantage of Linux operating system is that it is open source. There are many versions and their updates. Most of the servers run on Linux because if is easy to customize.

Question 23.
Write the few different distributions of Linux?
Answer:
Few different distributions of Linux are Ubuntu, Mint, Fedora, RedHat, Debian, Google’s Android, Chrome OS and Chromium OS.

Question 24.
What are the operating systems used in mobile devices?
Answer:
Apple iOS and Google Android are the mobile operating systems.

Question 25.
What is a Android?
Answer:
Android is a mobile operating system developed by Google, based on Linux and designed primarily for touch screen mobile devices such as smart phones and tablets.

Question 26.
What are the devices that uses Android operating system?
Answer:
Android TV for televisions, Android Auto for cars and Android wear for wrist watches, each with a specialized user interface. It is also used on game consoles, digital cameras, PCs and other electronic gadgets.

Question 27.
Write the uses of operating system.
Answer:
The main use of Operating System is

to ensure that a computer can be used do to exact if what the user wants it do.
easy interaction between the users and computers.
starting computer operation automati¬cally when power is turned on (Booting).
controlling Input and Output Devices.
manage the utilization of main memory.
providing security to user programs.

Question 28.
Mention the types of operating system.
Answer:

Single user operating system
Multi-user operating system
Multi processing operating system
Time sharing operating system
Real time operating system
Distributed operating system
Interactive operating system.

Question 29.
How the operating system provides securities to the end user?
Answer:
The Operating System provides three levels of securities to the user end.
They are
(i) File access level
(ii) System level
(iii) Network level.
(i) In order to access the files created by other people, one should have the access permission. Permissions can either be granted by the creator of the file or by the administrator of the system.
(ii) System level security is offered by the password in a multi-user environment. Both windows and Linux offer the password facility.
(iii) Network security is an indefinable one. So people from all over the world try to provide such a security.

Question 30.
Write short notes on time-sharing.
Answer:
Time sharing is one of the features of Operating Systems. It allows execution of multiple tasks or processes concurrently. For each task a fixed time is allocated. This division of time is called Time- sharing. The processor switches rapidly between various processes after a time is elapsed or the process is completed.
Eg: Assume that there are three processes called P1, P2, P3 and time allocated for each process 30, 40, 50 minutes respectively. If the process PI completes within 20 minutes then processor takes the next process P2 for the execution. If the process P2 could not complete within 40 minutes, then the current process P2 will be paused and switch over to the next process P3.

Question 31.
Write the responsibilities of operating system in connection with memory management.
Answer:
The Operating System is responsible for the following activities in connection with memory management:

Keeping track of which portion of memory are currently being used and who is using them.
Determining which processes (or parts of processes) and data to move in and out of memory.
Allocation and de-allocation of memory blocks as needed by the program in main memory. (Garbage Collection)

Question 32.
Write the responsibilities of operating system associated with the process management.
Answer:
The Operating System is responsible for the following activities associated with the process management:

Scheduling processes and threads on the CPUs.
Creating and deleting both user and system processes.
Suspending and resuming processes.
Providing mechanisms for process synchronization.
Providing mechanisms for process communication.

Question 33.
Write short note on file management.
Answer:
File management is an important function of OS which handles the data storage techniques. The operating System manages the files, folders and directory systems on a computer. Any type of data in a computer is stored in the form of files and directories/ folders through File Allocation Table (FAT). The FAT stores general information about files like filename, type (text or binary), size, starting address and access mode (sequential/ indexed/indexed-sequential/direct/relative).

Question 34.
What are the advantages of distributed operating system?
Answer:
The advantages of distributed Operating System are as follows:

A user at one location can make use of all the resources available at another location over the network.
Many computer resources can be added easily in the network.
Improves the interaction with the customers and clients.
Reduces the load on the host computer.

Question 35.
Write short note on Linux.
Answer:
Linux is a family of open-source operating systems. It can be modified and distributed by anyone around the world. This is different from proprietary software like Windows, which can only be modified by the company that owns it. The main advantage of Linux operating system is that it is open source. There are many versions and their updates. Most of the servers run on Linux because it is easy to customize.

Linux distributions: Linux mint, Fedora, Ubuntu, BOSS, Redhat.

Question 36.
Write in detail about memory management.
Answer:
Memory Management is the process of controlling and coordinating computer’s main memory and assigning memory block (space) to various running programs to optimize overall computer performance. It involves the allocation of specific memory blocks to individual programs based on user demands. At the application level, memory management ensures the availability of adequate memory for each running program at all times.

The Operating System is responsible for the following activities in connection with memory management:
(i) Keeping track of which portion of memory are currently being used and who is using them.
(ii) Determining which processes (or parts of processes) and data to move in and out of memory.
(iii) Allocation and de-allocation of memory blocks as needed by the program in main memory. (Garbage Collection)

Question 37.
How will you classify the operating system?
Answer:

TN State Board 11th Computer Science Important Questions Chapter 4 Theoretical Concepts of Operating System 1

Question 38.
What is a software? Explain the types of software?
Answer:
A software is set of instructions that perform specific task. It interacts basically with the hardware to generate the desired output.
Types of Software: Software is classified into two types:
(i) Application Software,
(ii) System Software.

Application software is a set of programs to perform specific task.
Eg: MS – word is an application software to create text document and VLC player is familiar application software to play audio, video files and many more.

System software is a type of computer program that is designed to run the computer ’s hardware and application programs.
Eg: Operating System and Language Processor.

Question 39.
Explain in detail the User Interface (Ul) in operating system.
Answer:
User interface is one of the significant feature in Operating System. The only way that user can make interaction with a computer. If the computer interface is not user-friendly, the user slowly reduces the computer usage from their normal life. This is a main reason for key success of GUI (Graphical User Interface) based Operating System.

The GUI is a window based system with a pointing device to direct I/O, choose from menus, make selections and a keyboard to enter text. Its vibrant colours attract the user very easily. Beginners are impressed by the help and pop up window message boxes. Icons are playing vital role of the particular application.

Now Linux distribution is also available as GUI based Operating System. The following points are considered when User Interface is designed for an application.
(i) The user interface should enable the user to retain this expertise for a longer time.
(ii) The user interface should also satisfy the customer based on their needs.
(iii) The user interface should save user’s precious time. Create graphical elements like Menus,Window,Tabs, Icons and reduce typing work will be an added advantage of the Operating System.
(iv) The ultimate aim of any product is to satisfy the customer. The User Interface is also to satisfy the customer.
(v) The user interface should reduce number of errors committed by the user with little practice the user should be in a position to avoid errors (Error Log File).

Question 40.
Explain the process management.
Answer:
Process management is function that includes creating and deleting processes and providing mechanisms for processes to communicate and synchronize with each other. A process is the unit of work (program) in a computer. A word-processing program being run by an individual user on a computer is a process. A system task, such as sending output to a printer or screen, can also be called as a Process.
A computer consists of a collection of processes, they are classified as two categories:

(i) Operating System processes which is executed by system code.
(ii) User Processes which is execute by user code.
All these processes can potentially execute concurrently on a single CPU.
A process needs certain resources including CPU time, memory, files and I/O devices to finish its task.

The Operating System is responsible for the following activities associated with the process management:
(i) Scheduling processes and threads on the CPUs
(ii) Creating and deleting both user and system processes
(iii) Suspending and resuming processes
(iv) Providing mechanisms for process synchronization
(v) Providing mechanisms for process communication.

Question 41.
What are the advantages of memory management in Operating System?
Answer:
Memory Management is the process of controlling and coordinating computer’s main memory and assigning memory block (space) to various running programs to optimize overall computer performance. It involves the allocation of specific memory blocks to individual programs based on user demands. At the application level, memory management ensures the availability of adequate memory for each running program at all times.

Question 42.
What is multi-user Operating system?
Answer:
It is used in computers and laptops that allow same data and applications to be accessed by multiple users at the same time. The users can also communicate with each other. Eg: Windows, Linux and UNIX.

Question 43.
What is a GUI?
Answer:
The Graphical User Interface is a type of user interface that allows users to interact with electronic devices through graphical icons and visual indicators such as secondary notation, instead of text-based user interfaces, typed command labels or text navigation.

Question 44.
List out different distributions of Linux operating system.
Answer:
Different distributions of Linux are Linux Mint, Fedora, Ubuntu, BOSS, RedHat.

Question 45.
What are the security management features available in Operating System?
Answer:
The Operating System provides three levels of securities to the user end. They are

File access level
System level
Network level.

Question 46.
What is multi-processing?
Answer:
Multi-processing is one of the features of Operating System. It has two or more processors for a single running process (job). Processing takes place in parallel is known as parallel processing. Each processor works on different parts of the same task or on two or more different tasks.

Question 47.
What are the different Operating Systems used in computer?
Answer:
Operating Systems used in personal computers and laptops are Windows, UNIX and Linux. The mobile devices mostly use Android and iOS as mobile OS.

Question 48.
What are the advantages and disadvantages of Time-sharing features?
Answer:
Advantages:

Provides the advantage of quick response.
Avoids duplication of software.
Reduces CPU idle time.
It can execute tasks simultaneously.

Disadvantages:

Problem of data communication and security.
Problem of reliability.

Question 49.
Explain and List out examples of mobile operating system.
Answer:
Mobile devices such as phones, tablets and MP3 players are different from desktop and laptop computers and hence they need special Operating Systems.
Eg: Apple iOS and Google Android.

Android:
It is a mobile operating system developed by Google, based on Linux and designed primarily for touch screen mobile devices such as smart phones and tablets. Google has developed Android TV for televisions, Android Auto for cars and Android Wear for wrist watches, each with a specialized user interface. Android are also used on game consoles, digital cameras, PCs and other electronic gadgets.

iOS-iPhone OS:
iOS (formerly iPhone OS) is a mobile Operating System created and developed by Apple Inc., exclusively for its hardware. It is the Operating System that powers many of the company’s mobile devices, including the iPhone, iPad and iPod Touch. It is the second most popular mobile Operating System globally after Android.

Question 50.
What are the differences between Windows and Linux Operating system?
Answer:

Windows	Linux
Microsoft Windows is a family of proprietary operating system.	Linux is a family of open source operating system.
It is a user interface.	It is a command line access.
It can only be modified by the company that owns it.	It can be modified and distributed by anyone around the world.

Question 51.
Explain the process management algorithms in Operating System.
Answer:
The following algorithms are mainly used to allocate the job (process) to the processor,
(i) FIFO
(ii) SJF
(iii) Round Robin
(iv) Based on Priority.
(i) FIFO (First In First Out) Scheduling:
The process that enters the queue first is executed first by the CPU, followed by the next and so on. The processes are executed in the order of the queue (row).

(ii) SJF (Shortest Job First) Scheduling:
This algorithm works based on the size of the job being executed by the CPU. Consider two j obs A and B.
(a) A = 6 kilo bytes, (b) B = 9 kilo bytes First the job “A” will be assigned and then job “B” gets its turn.

(iii) Round Robin Scheduling:
This algorithm is designed especially for time sharing systems. Jobs (processes) are assigned and processor time in a circular method. Take three jobs A, B, C. First the job A is assigned to CPU then job B and job C and then again A, B and C and so on.

(iv) Based On Priority:
The given job (process) is assigned based on a Priority. The job which has higher priority is more important than other jobs. Eg: Take two jobs A and B. Let the priority of A be 5 and priority B be 7.
Job B is assigned to the processor before job A.

Question 52.
Explain the concept of a Distributed Operating System.
Answer:
The distributed operating system takes care of the data and application that are stored and processed on multiple physical locations across the world over the digital network (internet/intranet). The Distributed Operating System is used to access shared data and files . that reside in any machine around the world. The user can handle the data from different locations. The users can access as if it is available on their own computer.
The advantages of distributed Operating System are as follows:
(i) A user at one location can make use of all the resources available at another location over the network.
(ii) Many computer resourcgs can be added easily in the network.
(iii) Improves the interaction with the customers and clients.
(iv) Reduces the load on the host computer.

Question 53.
Explain the main purpose of an operating system.
Answer:
In earlier day’s user had to design the application to the internal structure of the hardware. Operating system was needed to enable the user to design the application without the knowledge of the computer’s internal structure and hardware system.

Nowadays, user needs an interface to interact with the computer and controls the execution of all kinds of programs without knowing the internals of the hardware.
Usage of Operating system:
(i) Easy interaction between the human and computer.
(ii) Starting computer operation automatically when power is turned on.
(iii) Loading and scheduling users program.
(iv) Controlling input and output devices.
(v) Managing use of main memory.
(vi) Providing security to users program.

Question 54.
Explain advantages and disadvantages of open source operating systems.Answer:
Advantages:

It is cheaper.
It is high quality.
Open source operating system is very reliable.
Help us become more flexible.
Creativity.

Disadvantages:

Vulnerable to malicious users.
It is not always user-friendly.
Personalized support is rarely available.
Institutional and organizational procurement process affecting the decision making process.

Choose the correct answer:

Question 1.
__________ is set of instructions that perform specific test.
(a) Software
(b) Hardware
(c) Instruction
(d) Data
Answer:
(a) Software

Question 2.
There are _____ types of software.
(a) 2
(b) 3
(c) 4
(d) 6
Answer:
(a) 2

Question 3.
__________ is a set of programs to perform specific task.
(a) Software
(b) System software
(c) Application software
(d) Hardware
Answer:
(c) Application software

Question 4.
__________ is an application software.
(a) Linux
(b) Unix
(c) MS-Word
(d) Windows
Answer:
(c) MS-Word

Question 5.
________ is an system software:
(a) Windows
(b) MS-Word
(c) MS-Excell
(d) Lotus
Answer:
(a) Windows

Question 6.
An operating system allows only a single user to perform a task at a time is called as a:
(a) single user operating system
(b) multi-user operating system
(c) time sharing
(d) distributed operating system
Answer:
(a) single user operating system

Question 7.
The operating system provides levels of securities to the end user.
(a) four
(b) five
(c) six
(d) three
Answer:
(d) three

Question 8.
The expansion of FIFO is
(a) First In First Out
(b) Fast In Fast Out
(c) Fast In First Out
(d) First In Fast Out
Answer:
(a) First In First Out

Question 9.
The expansion of SJF is
(a) Slower Job First
(b) Slower Job Front
(c) Shortest Job First
(d) Shortest Job Front
Answer:
(c) Shortest Job First

Question 10.
________ Security is offered by the password in a multi-user environment:
(a) System level
(b) File level
(c) Network level
(d) Software level
Answer:
(a) System level

Question 11.
The Linux operating system was originated in the year:
(a) 1991
(b) 1997
(c) 1980
(d) 1993
Answer:
(a) 1991

Question 12.
__________ is an example for a single user operating system:
(a) Windows
(b) Linux
(c) Unix
(d) MS-Dos
Answer:
(d) MS-Dos

Question 13.
_______ management is the process of controlling and coordinating computer’s main memory:
(a) Memory
(b) Process
(c) Security
(d) Fault tolerance
Answer:
(a) Memory

Question 14.
The __________ operating system is used to access shared data and files that residue in any machine around the world:
(a) multiuser
(b) single user
(c) distributed
(d) time sharing
Answer:
(c) distributed

Question 15.
The ________ scheduling algorithm is designed especially for time sharing system:
(a) FIFO
(b) SJF
(c) Round Robin
(d) Based on priority
Answer:
(c) Round Robin

Question 16.
iOS was created and developed by:
(a) Apple Inc
(b) IBM
(c) Apple iOS
(d) Microsoft
Answer:
(a) Apple Inc

Question 17.
__________ is a computer related mistake.
(a) Data
(b) Program
(c) File
(d) Error
Answer:
(d) Error

Question 18.
An example of a single user and single task operating system is:
(a) MS-DOS
(b) UNIX
(c) Windows
(d) Linux
Answer:
(a) MS-DOS

Question 19.
An example of a multi user and multi task operating system:
(a) MS-DOS
(b) UNIX
(c) Windows
(d) Both (b) and (c)
Answer:
(d) Both (b) and (c)

Question 20.
Memory management is the process of controlling and co-ordinating:
(a) Operating system
(b) Application software
(c) Main memory
(d) Devices
Answer:
(c) Main memory

Question 21.
How many categories are classified by the collection of process?
(a) 1
(b) 2
(c) 3
(d) 4
Answer:
(b) 2

Question 22.
Which is based on queuing technique?
(a) FIFO
(b) SJF
(c) Round Robin
(d) Based on Priority
Answer:
(a) FIFO

Question 23.
Which scheduling works based on the size . of the job being executed by the CPU?
(a) FIFO
(b) SJF
(c) Round Robin
(d) Based on Priority
Answer:
(b) SJF

Question 24.
Which security is an indefinable one?
(a) Network level
(b) System level
(c) File level
(d) Process level
Answer:
(a) Network level

Question 25.
Which is one of the feature of operating system that allows execution of multiple tasks?
(a) File management
(b) Time sharing
(c) Memory management
(d) Process management
Answer:
(b) Time sharing

Question 26.
Which is used to access shared data and files that reside in any computer around the world?
(a) Single user operating system
(b) Multi user operating system
(c) Distributed operating system
(d) Mobile operating system
Answer:
(c) Distributed operating system

Question 27.
Which is a family of multitasking and multi-user operating systems?
(a) MS-DOS
(b) DOS
(c) CP / M
(d) UNIX
Answer:
(d) UNIX

Question 28.
UNIX was developed by:
(a) Ken Thompson
(b) Dennis Ritchie
(c) Thomas wood
(d) Both (a) and (b)
Answer:
(a) Ken Thompson

Question 29.
Which is called family of open-source operating systems?
(a) LINUX
(b) MS-DOS
(c) DOS
(d) Windows
Answer:
(a) LINUX

Question 30.
Linux operating system is similar to:
(a) MS-DOS
(b) UNIX
(c) DOS
(d) Windows
Answer:
(b) UNIX

Question 31.
Which is a windows alternative open source operating system?
(a) React OS
(b) LINUX
(c) UNIX
(d) MS-DOS
Answer:
(a) React OS

Question 32.
Who developed Android mobile operating system?
(a) Wipro
(b) Microsoft
(c) IBM
(d) Google
Answer:
(d) Google

Question 33.
Which is the second most popular mobile operating system globally after Android?
(a) UNIX
(b) LINUX
(c) iOS
(d) BOSS
Answer:
(a) UNIX

Question 34.
Match the following:

(a) Allocation and de – allocation of memorv blocks	(i) Process management
(b) Round Robin	(ii) Multi Drocessine
(c) File access level	(iii) Memory management
(d) Two or more processors for a single running process	(iv) Security management

(a) (iii), (i), (iv), (ii)
(b) (i), (iv), (ii), (iii)
(c) (iii), (iv), (i), (ii)
(d) (ii), (iii), (iv), (i)
Answer:
(a) (iii), (i), (iv), (ii)

Question 35.
Match the following:

(i) Application Software	(a) Assigning memory blocks to various running programs.
(ii) System Software	(b) A set of programs to perform specific task.
(in) Operating System	(c) Designed to run the computers hardware and application program.
(iv) Memory Management	(d) Interface between a user and a computer.

(a) (i) – (a); (ii) – (b); (iii) – (c); (iv) – (d)
(b) (i) – (b); (ii) – (c); (iii) – (d); (iv) – (a)
(c) (i) – (c); (ii) – (b); (iii) – (a); (iv) – (d)
(d) (i) – (d); (ii) – (a); (iii) – (b); (iv) – (c)
Answer:
(b) (i) – (b); (ii) – (c); (iii) – (d); (iv) – (a)

Question 36.
Find the odd man out:
(a) FIFO
(b) SJF
(c) Android
(d) Round Robin
Answer:
(c) Android

Question 37.
Find the odd man out:
(a) Unix
(b) Linux
(c) iOS
(d) Fault Tolerance
Answer:
(d) Fault Tolerance

Question 38.
Choose the correct pair.

Column – I	Column – II
(a) FIFO	Size of the job
(b) SJF	Queuing technique
(c) Multi – processing	Provides security to the end user.
(d) Time – sharing	Allows execution of multiple tasks or process concurrently.

Answer:
(d)

Question 39.
Identify the odd man out:
(a) Alpha
(b) Donut
(c) Froyo
(d) Mint
Answer:
(d) Mint

Question 40.
Choose the incorrect pair.

Column – I	Column – II
(a) Memory Management	Controlling and coordinating computer’s main memory
(b) Process Management	Function that includes creating and deleting process
(c) File Management	Handles the data storage techniques
(d) Time Sharing	Data and application are stored and processed on multiple physical locations across the world.

Answer:
(d)

Question 41.
Assertion (A):
Linux is a family of proprietary operating system.
Reason (R):
It can be modified and distributed by anyone around the world.
(a) Both A and R are true, and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Answer:
(d) A is false, but R is true.

Question 42.
Assertion (A):
Modem operating system use a Graphical User Interface (GUI).
Reason (R):
A GUI lets us use mouse to click icons, buttons, menus and everything clearly displayed on the screen.
(a) Both A and R are true, and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Answer:
(a) Both A and R are true, and R is the correct explanation for A.

Question 43.
Operating system is a:
(a) application software
(b) hardware
(c) system software
(d) component
Answer:
(c) system software

Question 44.
Identify the usage of operating systems:
(a) easy interaction between the human and computer
(b) controlling input and output Devices
(c) managing use of main memory
(d) all the above
Answer:
(d) all the above

Question 45.
Which of the following is not a function of an Operating System?
(a) Process Management
(b) Memory Management
(c) Security management
(d) Compiler Environment
Answer:
(d) Compiler Environment

Question 46.
Which of the following OS is a Commercially licensed Operating system?
(a) Windows
(b) UBUNTU
(c) FEDORA
(d) REDHAT
Answer:
(a) Windows

Question 47.
Which of the following Operating systems support Mobile Devices?
(a) Windows 7
(b) Linux
(c) BOSS
(d) iOS
Answer:
(d) iOS

Question 48.
File Management manages:
(a) files
(b) folders
(c) directory systems
(d) all the above
Answer:
(d) all the above

Question 49.
Interactive Operating System provides:
(a) Graphics User Interface (GUI)
(b) Data Distribution
(c) Security Management
(d) Real Time Processing
Answer:
(a) Graphics User Interface (GUI)

Question 50.
Android is a:
(a) Mobile Operating system
(b) Open Source
(c) Developed by Google
(d) All the above
Answer:
(d) All the above

Question 51.
Which of the following refers to Android operating system’s version?
(a) JELLY BEAN
(b) UBUNTU
(c) OS/2
(d) MITTIKA
Answer:
(a) JELLY BEAN

TN Board 11th Computer Science Important Questions

TN Board 11th Computer Science Important Questions Chapter 3 Computer Organization

October 20, 2021

TN State Board 11th Computer Science Important Questions Chapter 3 Computer Organization

Question 1.
Define computer organisation.
Answer:
Computer organization deals with the hardware components of a computer system. It includes input/output devices, the central processing unit, storage and primary memory. It is concerned with how the various components of computer hardware operate. It also deals with how they are interconnected to implement an architectural specification.

Question 2.
Define instruction set.
Answer:
A command which is given to a computer to perform an operation on data is called an instruction. Basic set of machine level instructions that a microprocessor is designed to execute is called as an instruction set.

Question 3.
What do you mean by word size?
Answer:
The number of bits that can be processed by a processor in a single instruction is called its word size. Word size determines the amount of RAM that can be accessed by a microprocessor. Total number of input and output pins in turn determines the architecture of the microprocessor.

Question 4.
Define bus.
Answer:
A bus is a collection of wires used for communication between the internal components of a computer.

Question 5.
What is decoder?
Answer:
A decoder is a digital circuit that is used to point to the specific memory location where the word can be located.

Question 6.
What is read operation?
Answer:
The read operation transfers the data (bits) from memory word to memory data register.

Question 7.
What is write operation?
Answer:
The write operation transfers the data (bits) from memory data register to word.

Question 8.
What criteria microprocessors are classified?
Answer:
Microprocessors are classified based on the following criteria:
(i) The width of data that can be processed.
(ii) The instruction set.

Question 9.
What is USB 3.0?
Answer:
USB 3.0 is the third major version of the Universal Serial Bus (USB) standard to connect computers with other electronic gadgets. It can transfer data up to 5 Giga byte/second. USB 3.1 and USB 3.2 are also released.

Question 10.
What are the two basic types of RAM?
Answer:
There are two basic types of RAM. They are
(i) Dynamic RAM (DRAM)
(ii) Static RAM (SRAM)

Question 11.
What is Access time?
Answer:
Access time is the time delay or latency between a request to an electronic system, and the access being completed or the requested data returned.

Question 12.
What is a computer memory?
Answer:
Computer memory is the storage space in the computer, where data and instructions are stored. Sequential access and random access are the two types of accessing methods to access (store or retrieve) the memory. In sequential access, the memory is accessed in an orderly manner from starting to end. In random access, any byte of memory can be accessed directly without navigating through previous bytes.

Question 13.
What is a system bus?
Answer:
The system bus is a bunch of wires which is the collection of address bus, data bus and control bus.

Question 14.
What do you understand by the word microprocessor?
Answer:
The microprocessor is a programmable multipurpose silicon chip. It is driven by clock pulses. It accepts input as a binary data and after processing, it provides the output data as per the instructions stored in the memory.

Question 15.
What is meant by Hertz?
Answer:
Hertz (Hz) is the standard unit of measurement used for measuring frequency. Frequency is measured in cycles per second, one hertz equals one cycle per second.

Question 16.
What is called clock speed?
Answer:
The speed at which the microprocessor executes instructions is called the clock speed. Clock speed is measured in MHz (Mega Hertz) or in GHz (Giga Hertz).

Question 17.
How the word size is determined?
Answer:
It determines the amount of RAM that can be accessed by a microprocessor at one time and the total number of pins on the microprocessor. Total number of input and output pins in turn determines the architecture of the microprocessor.

Question 18.
Why is top surface of the EPROM chip is covered by stickers?
Answer:
EPROM chips have a transparent area at the top surface which is covered by stickers. If it gets removed, the ultraviolet light in the sunlight may erase the contents.

Question 19.
What do you understand about cache memory?
Answer:
It is a very high speed and expensive memory, which is used to speed up the memory retrieval process.

Question 20.
What do you understand by backup storage?
Answer:
Secondary storage devices serve as a supportive storage to main memory and they are non-volatile in nature,
secondary storage is also called as backup storage.

Question 21.
What are the areas that can use flash memories?
Answer:
Flash memories can be used in personal computers, personal digital assistants (PDA), digital audio players, digital cameras and mobile phones.

Question 22.
What are the uses of Blu-ray disc?
Answer:
It enables recording, rewriting and playback of high-definition video and storing large amount of data.

Question 23.
What is the use of MDR?
Answer:
The memory Data Register (MDR) keeps the data which is transferee! between the memory and the CPU.

Question 24.
What is microprocessor? Draw the block diagram of microprocessor.
Answer:
The microprocessor is a programmable multipurpose silicon chip that is based on a register. It is driven by clock pulses. It accepts input as a binary data and after processing, it provides the output data as per the instructions stored in the memory.

TN State Board 11th Computer Science Important Questions Chapter 3 Computer Organization 1

Question 25.
Write short notes on DVD.
Answer:
A DVD (Digital Versatile Disc or Digital Video Disc) is an optical disc capable of storing up to 4.7 GB of data, more than six times what a CD can hold. They are often used to store movies at a better quality. Like CDs, DVDs are read with a laser.

The disc can have one or two sides, and one or two layers of data per side; the number of sides and layers determines how much it can hold. A 12 cm diameter disc with single sided, single layer has 4.7 GB capacity, whereas the single sided, double layer has 8.5 GB capacity. The 8 cm DVD has 1.5 GB capacity.

The capacity of a DVD-ROM can be visually determined by noting the number of data sides of the disc. Double-layered sides are usually gold- coloured, while single-layered sides are usually silver-coloured, like a CD.

Question 26.
Write short notes on Blu-ray Disc.
Answer:
Blu-Ray Disc is a high-density optical disc similar to DVD. It is used for PlayStation games and for playing high-definition (HD) movies. A double-layer BIu-Ray disc can store up to 50GB (gigabytes) of data. This is more than 5 times the capacity of a DVD, and above 70 times of a CD.

The format was developed to enable recording, rewriting and playback of high-definition video, as well as storing large amount of data. DVD uses a red laser to read and write data. Blu-ray uses a blue-violet laser to write. Hence, it is called as Blu-Ray.

Question 27.
What are the methods to access the memory? Draw the Memory Hierarchy.
Answer:
There are two types of accessing methods to access (read or write) the memory. They are sequential access and random access. In sequential access, the memory is accessed in an orderly manner from starting to end. But, in random access, any byte of memory can be accessed directly without navigating through previous bytes.
→ refer figure no. 3.4.

Question 28.
Differentiate static RAM and Dynamic RAM.
Answer:

Static RAM	Dynamic RAM
It needs to be refreshed less often.	It needs to be refreshed frequently.
It is more expensive.	It is less expensive.
It uses transistor to store a single bit of data.	It uses a separate capacitor to store each bit of data.
It is used in cache memory.	It is used in main memory.

Question 29.
What are the three main units of microprocessor?
Answer:
The microprocessor is made up of 3 main units. They are-
(i) Arithmetic and Logic unit (ALU):
To perform arithmetic and logical instructions based on computer instructions.

(ii) Control unit:
To control the overall operations of the computer through signals.

(iii) Registers (Internal Memory):
They are used to hold the instruction and data for the execution of the processor.

TN State Board 11th Computer Science Important Questions Chapter 3 Computer Organization 2

Question 30.
List down the types of operations that carried out by the instruction set.
Answer:

Data transfer
Arithmetic operations
Logical operations
Control flow
Input / output

Question 31.
Explain in detail the various types of storage devices.
Answer:
Secondary Storage Devices:
The secondary storage devices are used to store data that is of larger size which can be accessed later. Since the main memory is costly, the size is generally very limited in a computer. A portion of a secondary storage which can serve as an extension of the main memory and can perform its job is called as virtual memory.

Hard Disks:
Hard disk is a magnetic disk on which you can store computer data. Hard disks can store more data and are faster than floppy disks. A hard disk cqtn store from 10 megabytes to several gigabytes, whereas most floppies have a maximum storage capacity of 1.4 megabytes. Hard disks are less portable than floppies, although it is possible to port by removable hard disks. There are two types of removable hard disks: disk packs and removable cartridges.

Compact Disc (CD):
A CD or CD-ROM is made from 1.2 millimeters thick, polycarbonate plastic material. A thin layer of aluminum or gold is applied to the surface. CD data is represented as tiny indentations known as “pits”, encoded in a spiral track moulded into the top of the polycarbonate layer. The areas between pits are known as “lands”. A motor within the CD player rotates the disk. The capacity of an ordinary CD-ROM is 700MB.

Digital Versatile Disc (DVD):
A DVD (Digital Versatile Disc or Digital Video Disc) is an optical disc capable of storing up to 4.7 GB of data, more than six times what a CD can hold. DVDs are often used to store movies at a better quality than with a VHS. They can also have interactive menus and bonus features such as deleted scenes and commentaries. Like CDs, DVDs are read with a laser.

Flash Memory Devices:
It is an electronic (solid-state) non-volatile computer storage medium that can be electrically erased and
reprogrammed. They are either EEPROM or EPROM. Eg: Pendrives, memory cards etc. Flash memories can be used in personal computers, Personal Digital Assistants (PDA), digital audio players, digital cameras and mobile phones. Flash memory offers fast access times. The time taken to read or write a character in memory is called access time. The capacity of the flash memories vary from 1 Gigabytes (GB) to 2 Terabytes (TB).

Blu-Ray Disc:
It is a high-density optical disc format similar to DVD. Blu-ray is used for Play station games and for playing high-definition (HD) movies. A double¬layer Blu-Ray disc can store up to 50GB (gigabytes) of data. This is more than 5 times the capacity of a DVD, and above 70 times of a CD.

The format was developed to enable recording, rewriting and playback of high-definition video (HD), as well as storing large amounts of data. DVD uses a red laser to read and write data. Blu-ray uses a blue-violet laser to write. Hence, it is called as Blu-Ray.

Question 32.
What are the parameters which influence the characteristics of a microprocessor?
Answer:
A Microprocessor’s performance depends on the following characteristics:

Clock speed
Instruction set
Word size.

Question 33.
What is an instruction?
Answer:
A command which is given to a computer to perform an operation on a piece of data is called an instruction.

Question 34.
What is a program counter?
Answer:
The Program Counter (PC) is a special register in the CPU which always keeps the address of the next instruction to be executed.

Question 35.
What is HDMI?
Answer:
High-Definition Multimedia Interface is an audio/video interface which transfers the uncompressed video and audio data from a video controller, to a compatible computer monitor, LCD projector, digital television etc.

Question 36.
Which source is used to erase the content of a EPROM?
Answer:
Erasable Programmable Read Only Memory is a special type of memory which serves as a PROM, but the content can be erased using ultraviolet rays. EPROM retains its contents until it is exposed to ultraviolet light. The ultraviolet light clears its contents, making it possible to reprogram the memory.

Question 37.
Differentiate Computer Organisation from Computer Architecture.
Answer:

Computer Organisation	Computer Architecture
Computer organisation deals with the hardware components of a computer system. It includes input / output devices, the central processing unit, storage and primarv memory.	Computer architecture deals with the engineering considerations involved in designing a computer.

Question 38.
Classify the microprocessor based on the size of the data.
Answer:
Depending on the data width, microprocessors can process instructions. The microprocessors can be classified as follows:

8-bit microprocessor
16-bit microprocessor
32-bit microprocessor
64-bit microprocessor.

Question 39.
Write down the classifications of microprocessors based on the instruction set.
Answer:
Reduced Instruction Set Computers (RISC):
They have a small set of highly optimized instructions. Complex instructions are also implemented using simpler instructions, thus reducing the size of the instruction set. Eg: RISC processors are Intel P6, Pentium IV, AMD K6 and K7.

Complex Instruction Set Computers (CISC):
They support hundreds of instructions. Computers supporting CISC can accomplish a wide variety of tasks, making them ideal for personal computers.
Eg: CISC processors are Intel 386 & 486, Pentium, Pentium II and III, and Motorola 68000.

Question 40.
Differentiate PROM and EPROM.
Answer:

PROM	EPROM
PROM is a memory on which data can be written only once.	EPROM is a memory on which ultra violet rays are used to clear its contents and making it possible to reprogram the memory.

Question 41.
Write down the interfaces and ports available in a computer.
Answer:

TN State Board 11th Computer Science Important Questions Chapter 3 Computer Organization 3

Serial Port:
To connect the external devices, found in old computers.

Parallel Port:
To connect the printers, found in old computers.

USB Ports:
To connect external devices like cameras, scanners, mobile phones, external hard disks and printers to the computer. USB 3.0 is the third major version of the Universal Serial Bus (USB) standard to connect computers with other electronic gadgets. USB 3.0 can transfer data up to 5 Giga byte/second. USB 3.1 and USB 3.2 are also released.

VGA Connector:
To connect a monitor or any display device like LCD projector.

Audio Plugs:
To connect sound speakers, microphone and headphones.

PS/2 Port:
To connect mouse and keyboard to PC.

SCSI Port:
To connect the jtard disk drives and network connectors.

High Definition Multimedia Interface (HDMI):
It is an audio/video interface which transfers the uncompressed video and audio data from a video controller, to a compatible computer monitor, LCD projector, digital television etc.

Question 42.
Differentiate CD and DVD.
Answer:

CD	DVD
CD stands for Compact Disk.	DVD stands for Digital Versatile Disc.
CDs are made with the purpose of holding audio files as well as program files.	DVDs are made with the purpose of holding video files, movies, substantial amount of programs etc.
A standard CD can store about 700 MB of data.	A standard DVD can hold 4.7 GB of data.

Question 43.
How will you differentiate a flash memory and an EEPROM?
Answer:

Flash Memory	EEPROM
The flash memory allows data to be written or erased in blocks.	The EEPROM requires data to be written or erased one bvte at a time.
Flash memory is faster in performance.	EEPROM is slower in performance.
It uses NAND type memory.	It uses NOR type memory.

Question 44.
Explain the characteristics of a micro processor.
Answer:
A Microprocessor’s performance depends on the following characteristics:
(i) Clock speed
(ii) Instruction set
(iii) Word size.

(i) Clock Speed:
Every microprocessor has an internal clock that regulates the speed at which it executes instructions. The speed at which the microprocessor executes instructions is called the clock speed. Clock speed is measured in MHz (Mega Hertz) or in GHz (Giga Hertz).

Instruction Set:
A command which is given to a computer to perform an operation on data is called an instruction. Basic set of machine level instructions that a microprocessor is designed to execute is called as an instruction set This instruction set carries Data transfer, Arithmetic operations, Logical operations, Control flow, Input/output operations.

(iii) Word Size:
The number of bits that can be processed by a processor in a single instruction is called its word size. Word size determines the amount of RAM that can be accessed by a microprocessor at one time and the total number of pins on the microprocessor. Total number of input and output pins in turn determines the architecture of the microprocessor.

Question 45.
How the read and write operations are performed by a processor? Explain.
Answer:
The read operation fetches data from memory and transfers to MDR. A single control line performs two operations like Read / Write using 1 or 0. The write operation transfers data from the MDR to memory. This organisation is shown below in figure.

TN State Board 11th Computer Science Important Questions Chapter 3 Computer Organization 4

The word in the RAM has the same size (no. of bits) as the Memory Data Register (MDR). If the processor is an 8-bit processor like Intel 8085, its MDR and the word in the RAM both have 8 bits. If the size of the MDR is eight bits, which can be connected with a word of eight bits where the data can be stored or retrieved, the data bus has eight wires in parallel to transfer the data in any one direction which depends on whether the control is read or write.

This control line is labeled as R/W, which becomes 1 means READ operation and 0 means WRITE operation. Figure shows the content of MDR and the Memory Word before the READ operation. Also Figure shows the content of MDR and the Memory Word after the READ operation.read operation transfers the data (bits) from word to memory data register. The write operation transfers the data (bits) from memory data register to word.

TN State Board 11th Computer Science Important Questions Chapter 3 Computer Organization 5

TN State Board 11th Computer Science Important Questions Chapter 3 Computer Organization 6

Question 46.
Arrange the memory devices in ascending order based on the access time.
Answer:

TN State Board 11th Computer Science Important Questions Chapter 3 Computer Organization 7

Cache memory:
The cache is a very hi§h speed, expensive piece of memory, which is used to speed up the memory retrieval process. The idea of introducing a cache is that, this extremely fast memory would store data that is frequently accessed and if possible, the data that is spatially closer to it. This helps to achieve the fast response time.

Random-access memory / main memory:
RAM is a volatile memory, which means that the information stored in it is not permanent. When the power is turned off, whatever data that resided in a RAM is lost. It allows both read and write operations.

Hard Disk:
Hard disk a ma§netic disk on which we can store computer data. Hard disks are less portable than floppies, although it is possible to port by removable hard disks. Disk packs and removable cartridges are the two types of removable hard disks.

Compact disk:
A CD or CD-ROM is made from 1.2 millimeters thick, polycarbonate plastic material. A thin layer of aluminium or gold is applied to the surface. CD data is represented as tiny indentations known as “pits”, encoded in a spiral track moulded into the top of the polycarbonate layer. The areas between pits are known as “lands”. A motor within the CD player rotates the disk. The capacity of an ordinary CD-ROM is 700MB.

Question 47.
Explain the types of ROM.
Answer:
Read-Only memory (ROM):
It refers to special memory in a computer with pre-recorded data at manufacturing time which cannot be modified. The stored programs that start the computer and perform diagnostics are available in ROMs. ROM stores critical programs such as the program that boots the computer. Once the data has been written onto a ROM chip, it cannot be modified or removed and can only be read. ROM retains its contents even when the computer is turned off. So, ROM is called as a non¬volatile memory.

Programmable Read-Only Memory (PROM):
It is also a non-volatile memory on which data can be written only once. Once a program has been written onto a PROM, it remains there forever. Unlike the main memory, PROMs retain their contents even when the computer is turned off.

The PROM differs from ROM. PROM is manufactured as a blank memory, whereas a ROM is programmed during the manufacturing process itself. PROM programmer or a PROM burner is used to write data to a PROM chip. The process of programming a PROM is called burning the PROM.

Erasable Programmable Read-Only Memory (EPROM):
It is a special type of memory which serves as a PROM, out the content can be erased using ultraviolet rays. EPROM retains its contents until it is exposed to ultraviolet light. The ultraviolet light clears its contents, making it possible to reprogram the memory.

An EPROM differs from a PROM, PROM can be written only once and cannot be erased. EPROMs are used widely in personal computers because they enable the manufacturer to change the contents of the PROM to replace with updated versions or erase the contents before the computer is delivered.

Electrically Erasable Programmable Read Only Memory is a special type of PROM that can be erased by exposing it to an electrical charge. Like other types of PROM, EEPROM retains its contents even when the power is turned off. Comparing with all other types of ROM, EEPROM is slower in performance.

Choose the correct answer:

Question 1.
Which type of integrated circuit were introduced in early 1970s?
(a) Microprocessor
(b) Pentium
(c) Intel
(d) AMD
Answer:
(a) Microprocessor

Question 2.
Which is the first microprocessor developed by Intel Inc?
(a) 8008
(b) 4004
(c) 8086
(d) 8085
Answer:
(b) 4004

Question 3.
What is the standard unit of speed measurement used for measuring frequency?
(a) Watt
(b) Speed
(c) Hertz
(d) Meter
Answer:
(c) Hertz

Question 4.
One hertz equals:
(a) one cycle per second
(b) one cycle per minute
(c) one cycle per hour
(d) one cycle per year
Answer:
(a) one cycle per second

Question 5.
Which regulates the speed and executes instructions in every microprocessor?
(a) Instruction set
(b) Internal clock
(c) Clock speed
(d) Control flow
Answer:
(b) Internal clock

Question 6.
What is the unit of measuring clock speed?
(a) MHz (Mega Hertz)
(b) GHz (Giga Hertz)
(c) Speed
(d) Both (a) and (b)
Answer:
(d) Both (a) and (b)

Question 7.
Which command is given to a computer to perform an operation on data?
(a) Instruction
(b) Data
(c) Program
(d) Operation
Answer:
(a) Instruction

Question 8.
What is called a basic set of machine level instructions that a microprocessor is designed to execute?
(a) Instruction set
(b) Internal clock
(c) Internal memory
(d) Frequency
Answer:
(a) Instruction set

Question 9.
Which keeps the data that is transferred between the memory and the CPU?
(a) RAM
(b) Data transfer
(c) Instruction
(d) Memory Data Register
Answer:
(d) Memory Data Register

Question 10.
What is the special register which always keeps the address of next instruction to be executed?
(a) Program counter
(b) Data transfer
(c) Memory Register
(d) Memory Data Register
Answer:
(a) Program counter

Question 11.
What is called a collection of wires used for communication between internal components of the computer?
(a) Memory
(b) Data
(c) Bus
(d) Processor
Answer:
(c) Bus

Question 12.
Which digital circuit is used to point to the specific memory location where the word can be located?
(a) Instruction
(b) Decoder
(c) Compiler
(d) Interpreter
Answer:
(b) Decoder

Question 13.
Which operation is transfers the data from word to Memory Data Register?
(a) Read
(b) Write
(c) Copy
(d) Move
Answer:
(a) Read

Question 14.
Which operation transfers the data from Memory Data Register to word?
(a) Read
(b) Write
(c) Copy
(d) Move
Answer:
(b) Write

Question 15.
RISC stands for:
(a) Reduced Instruction Set Computers
(b) Replaced Instruction Set Computers
(c) Resolved Instruction Set Computers
(d) Recalled Instruction Set Computers
Answer:
(a) Reduced Instruction Set Computers

Question 16.
Which of the following is RISC processor?
(a) Pentium IV
(b) Intel P6
(c) AMD K7
(d) All the above
Answer:
(d) All the above

Question 17.
CISC stands for:
(a) Completed Instruction Set Computers
(b) Complex Instruction Set Computers
(c) Compiled Instruction Set Computers
(d) Copied Instruction Set Computers
Answer:
(b) Complex Instruction Set Computers

Question 18.
Which of the following is CISC processor?
(a) Intel 386
(b) Pentium
(c) Motorola 68000
(d) All the above
Answer:
(d) All the above

Question 19.
How many types of accessing methods are used to access the memory?
(a) 2
(b) 3
(c) 4
(d) 5
Answer:
(a) 2

Question 20.
The memory is accessed in an orderly manner from starting to end in:
(a) Sequential access
(b) Random access
(c) Directly access
(d) All the above
Answer:
(a) Sequential access

Question 21.
The memory is accessed directly without navigating through previous bytes is:
(a) Sequential access
(b) Random access
(c) Ascending access
(d) All the above
Answer:
(b) Random access

Question 22.
The Random access memory (RAM) is also called:
(a) Primary memory
(b) Main memory
(c) Volatile memory
(d) All the above
Answer:
(d) All the above

Question 23.
What is the smallest unit of information that can be stored in the memory?
(a) Bit
(b) Byte
(c) Kilo byte
(d) Mega byte
Answer:
(a) Bit

Question 24.
The bytes are referred by:
(a) Be
(b) B
(c) Bi
(d) By
Answer:
(b) B

Question 25.
Which of the following memory is more expensive than other memories?
(a) Static RAM (SRAM)
(b) Dynamic RAM (DRAM)
(c) PROM
(d) ROM
Answer:
(a) Static RAM (SRAM)

Question 26.
Which of the memory can store critical programs such as that boots the computer?
(a) RAM
(b) ROM
(c) Memory
(d) All the above
Answer:
(b) ROM

Question 27.
Which memory is programmed during the manufacturing process itself?
(a) ROM
(b) RAM
(c) PROM
(d) EPROM
Answer:
(a) ROM

Question 28.
Which memory retains its contents until it is exposed to ultraviolet light?
(a) ROM
(b) RAM
(c) PROM
(d) EPROM
Answer:
(d) EPROM

Question 29.
Which memory is used widely in personal computers?
(a) ROM
(b) RAM
(c) PROM
(d) EPROM
Answer:
(d) EPROM

Question 30.
Which memory is used to speedup the memory retrieval process?
(a) RAM
(b) ROM
(c) Cache memory
(d) EPROM
Answer:
(c) Cache memory

Question 31.
Which refers to how quickly the memory can respond to a read / write request?
(a) Response time
(b) Memory time
(c) Read time
(d) Both (a) and (b)
Answer:
(a) Response time

Question 32.
Secondary storage is also called as:
(a) Main storage
(b) Backup storage
(c) Temporary storage
(d) None of these
Answer:
(b) Backup storage

Question 33.
The CD data is represented as tiny indentations is:
(a) pits
(b) track
(c) layer
(d) disk
Answer:
(a) pits

Question 34.
The areas between pits are:
(a) lands
(b) tracks
(c) layers
(d) disks
Answer:
(a) lands

Question 35.
DVD stands for:
(a) Digital Versatile Disc
(b) Digital Video Disc
(c) Digital Volatile Disc
(d) Either (a) or (b)
Answer:
(d) Either (a) or (b)

Question 36.
CDs and DVDs are read with:
(a) layer
(b) laser
(c) pins
(d) rays
Answer:
(b) laser

Question 37.
What is the colour of double-layered CD sides?
(a) Silver
(b) Yellow
(c) White
(d) Gold
Answer:
(d) Gold

Question 38.
What is the colour of single-coloured CD sides?
(a) Silver
(b) Yellow
(c) White
(d) Gold
Answer:
(a) Silver

Question 39.
Which memory is an electronic non-volatile computer storage medium?
(a) RAM
(b) ROM
(c) Flash
(d) Blu-ray disc
Answer:
(c) Flash

Question 40.
Which of the following is known as flash memory?
(a) ROM
(b) Pen drives
(c) Memory cards
(d) Both (b) and (c)
Answer:
(d) Both (b) and (c)

Question 41.
Which is a high-density optical disc similar to DVD?
(a) HD
(b) RAM
(c) ROM
(d) Blu-ray
Answer:
(d) Blu-ray

Question 42.
How much gigabytes (GB) of data can be stored in double-layer Blu-ray disc?
(a) 20
(b) 30
(c) 40
(d) 50
Answer:
(d) 50

Question 43.
Which type of laser is used to read and write the data in blu-ray disc?
(a) Violet
(b) Blue-violet
(c) Red-violet
(d) Silver-violet
Answer:
(b) Blue-violet

Question 44.
Which type of laser is used to read and write the data in DVD?
(a) Red
(b) Blue
(c) Blue-violet
(d) Red-violet
Answer:
(a) Red

Question 45.
USB stands for:
(a) Universal Serial Bus
(b) United Serial Bus
(c) Union Serial Bus
(d) Uniform Serial Bus
Answer:
(a) Universal Serial Bus

Question 46.
Which port is used to connect external devices?
(a) USB
(b) VGA
(c) PS/2
(d) SCSI
Answer:
(a) USB

Question 47.
Which port is used to connect input devices?
(a) USB
(b) VGA
(c) PS/2
(d) SCSI
Answer:
(c) PS/2

Question 48.
Which port is used to connect sound devices and head phones?
(a) Audio plugs
(b) USB
(c) VGA
(d) PS/2
Answer:
(a) Audio plugs

Question 49.
Which port is used to connect hard disk and network connectors?
(a) USB
(b) VGA
(c) PS/2
(d) SCSI
Answer:
(d) SCSI

Question 50.
HDMI stands for:
(a) High Definition Multimedia Interface
(b) High Deallocation Multimedia Interface
(c) High Deblocking Multimedia Interface
(d) High Debugging Multimedia Interface
Answer:
(a) High Definition Multimedia Interface

Question 51.
HDMI is a/an:
(a) locator
(b) encoder
(c) audio / video interface
(d) multiplexer
Answer:
(c) audio / video interface

Question 52.
Match the following:

(a) The speed which micro processor executes instructions	(i) Word size
(b) Determined by the processor	(ii) Write operation
(c) Address of the next instruction to be executed	(iii) Clock speed
(d) Transfers data from memory data register to word.	(iv) Program counter

(a) (ii), (iii), (i), (iv)
(b) (iii), (i), (iv), (ii)
(c) (iv), (ii), (iii), (i)
(d) (iii), (iv), (ii), (i)
Answer:
(b) (iii), (i), (iv), (ii)

Question 53.
________ deals with the engineering considerations involved in designing a computer.
(a) Computer organisation
(b) Computer architecture
(c) Microprocessor
(d) Registers
Answer:
(b) Computer architecture

Question 54.
Microprocessor is made up of ______ units.
(a) 3
(b) 2
(c) 4
(d) 5
Answer:
(a) 3

Question 55.
The speed at which the microprocessor executes instructions is called:
(a) clock speed
(b) instruction set
(c) word size
(d) control flow
Answer:
(a) clock speed

Question 56.
The number of bits that can be processed by a processor in a single instruction is called its:
(a) clock speed
(b) instruction set
(c) word size
(d) control flow
Answer:
(c) word size

Question 57.
_________ is unidirectional.
(a) Data bus
(b) Control bus
(c) Register
(d) Address bus
Answer:
(d) Address bus

Question 58.
________ is bidirectional.
(a) Data bus
(b) Control bus
(c) Register
(d) Address bus
Answer:
(a) Data bus

Question 59.
_________ is a volatile memory.
(a) ROM
(b) EPROM
(c) PROM
(d) RAM
Answer:
(d) RAM

Question 60.
The areas between pits are known as:
(a) sector
(b) track
(c) layer
(d) lands
Answer:
(d) lands

Question 61.
The capacity of an ordinary CD-ROM is:
(a) 800 MB
(b) 700 MB
(c) 900 MB
(d) 600 MB
Answer:
(b) 700 MB

Question 62
________ is the type of disc used for play station games and for playing high-definition (HD) movies.
(a) Hard disks
(b) CD
(c) DVD
(d) Blu-ray disc
Answer:
(d) Blu-ray disc

Question 63.
Match the following:

(i) ALU	(a) Perform an operation on data
(ii) Clock speed	(b) The number of bits that can be processed.
(iii) Instruction set	(c) Perform Arithmetic and Logical instructions
(iv) Word size	(d) Regulates the speed at which the microprocessor executes instruction

(a) (i) – (c); (ii) – (d); (iii) – (a); (iv) – (b)
(b) (i) – (c); (ii) – (b); (iii) – (a); (iv) – (d)
(c) (i) – (b); (ii) – (a); (iii) – (d); (iv) – (c)
(d) (i) – (d); (ii) – (c); (iii) – (a); (iv) – (b)
Answer:
(a) (i) – (c); (ii) – (d); (iii) – (a); (iv) – (b)

Question 64.
Find the odd man out:
(a) Serial
(b) USB
(c) Keyboard
(d) SCSI
Answer:
(c) Keyboard

Question 65.
Find the odd man out:
(a) Intel 386
(b) Pentium II
(c) Motorola 68000
(d) AMD K6
Answer:
(d) AMD K6

Question 66.
Match the following:

(i) Parallel port	(a) To connect sound speakers, microphones
(ii) Audio plugs	(b) To connect the printers
(iii) Ps/2 port	(c) To connect the hard disk drives and network connectors
(iv) SCSI port	(d) To connect mouse and keyboard to PC

(a) (i) – (a); (ii) – (c); (iii) – (d); (iv) – (b)
(b) (i) – (b); (ii) – (a): (iii) – (c); (iv) – (d)
(c) (i) – (a); (ii) – (d); (iii) – (c); (iv) – (b)
(d) (i) – (b); (ii) – (a); (iii) – (d); (iv) – (c)
Answer:
(d) (i) – (b); (ii) – (a); (iii) – (d); (iv) – (c)

Question 67.
Match the incorrect pair:

Column I	Column II
(a) CPU	Central Processing Unit
(b)MDR	Memory Digital Register
(c) MAR	Memory Address Register
(d) ALU	Arithmetic and Logic Unit

Answer:
(b)

Question 68.
Assertion (A):
Computer organization deals with the hardware components of a computer system.
Reason (R):
It includes Input/Output devices, the central processing unit, storage devices and primary memory.
(a) Both A and R are true, and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Answer:
(a) Both A and R are true, and R is the correct explanation for A.

Question 69.
Assertion (A):
RISC have big set of highly optimized instructions.
Reason (R):
It reduces the size of the instruction set.
(a) Both A and R are true, and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Answer:
(d) A is false, but R is true.

Question 70.
Which Of the following is said to be the brain of a computer?
(a) Input devices
(b) Output devices
(c) Memory device
(d) Microprocessor
Answer:
(d) Microprocessor

Question 71.
Which of the following is not the part of a microprocessor unit?
(a) ALU
(b) Control unit
(c) Cache memory
(d) Register
Answer:
(c) Cache memory

Question 72.
How many bits constitute a word?
(a) 8
(b) 16
(c) 32
(d) Determined by the processor used.
Answer:
(d) Determined by the processor used.

Question 73.
Which of the following device identifies the location when address is placed in the memory address register?
(a) Locator
(b) Encoder
(c) Decoder
(d) Multiplexer
Answer:
(c) Decoder

Question 74.
Which of the following is a CISC processor?
(a) Intel P6
(b) AMD K6
(c) Pentium III
(d) Pentium IV
Answer:
(c) Pentium III

Question 75.
Which is the fastest memory?
(a) Hard disk
(b) Main memory
(c) Cache memory
(d) Blue-Ray disc
Answer:
(c) Cache memory

Question 76.
How many memory locations are identified by a processor with 8 bits address bus at a time?
(a) 28
(b) 1024
(c) 256
(d) 8000
Answer:
(c) 256

Question 77.
What is the capacity of 12cm diameter DVD with single sided and single layer?
(a) 4.7 GB
(b) 5.5 GB
(c) 7.8GB
(d) 2.2 GB
Answer:
(a) 4.7 GB

Question 78.
What is the smallest size of data represented in a CD?
(a) Blocks
(b) Sectors
(c) Pits
(d) Tracks
Answer:
(c) Pits

Question 79.
Display devices are connected to the computer through:
(a) USB port
(b) PS/2 port
(c) SCSI port
(d) VGA connector
Answer:
(d) VGA connector

TN Board 11th Computer Science Important Questions

TN Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2

October 20, 2021

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2

Question 1.
Define Truth Table.
Answer:
A truth table represents all the possible values of logical variable or statements along with all the possible results of given combination of truth values.

Question 2.
What are logical operators?
Answer:
The basic logical operations are AND, OR and NOT, which are symbolically represented by dot (.), plus (+), and by over bar / single apostrophe respectively. These symbols are also called as “Logical Operators”.

Question 3.
Define AND operator?
Answer:
The AND operator is defined in Boolean algebra by the use of the dot (.) operator. It is similar to multiplication in ordinary algebra. The AND operator combines two or more input variables. So that the output is true only if all the inputs are true. The truth table for a 2-input AND operator is

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 5

The above 2-input AND operation is expressed as: Y = A . B

Question 4.
What is OR operator?
Answer:
The plus sign is used to indicate the OR operator. The OR operator combines two or more input variables. So that the output is true if at least one input is true. The truth table for a 2-input OR operator is

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 6

The above 2-input OR operation is expressed as: Y = A + B

Question 5.
What is NOT operator?
Answer:
The NOT operator has one input and one output. The input is either true or false, and the output is always the opposite, i.e., the NOT operator inverts the input. The truth table for a NOT operator where A is the input variable and Y is the output shown below:

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 7

The NOT operator is represented algebraically by the Boolean expression: Y = $\overline{\mathrm{A}}$.

Question 6.
What is NAND operator?
Answer:
The NAND is the combination of NOT and AND. The NAND is generated by inverting the output of an AND operator. The algebraic expression of the NAND function is:
Y = $\overline{\mathrm{A} \cdot \mathrm{B}}$
The NAND function truth table is shown below:

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 8

A NAND B = NOT (A AND B)

Question 7.
What is called basic logic gates?
Answer:
A gate is a basic electronic circuit which operates on one or more signals to produce an output signal. There are three fundamental gates namely AND, OR and NOT.

Question 8.
Write the Distributive law.
Answer:
A . (B + C) = A . B + A . C
A + (B . C) = (A + B) . (A + C)

Question 9.
Complete the following:
(i) A + $\overline{\mathrm{A}}$ =
(ii) A. $\overline{\mathrm{A}}$ =
(iii) $\overline{\overline{\mathrm{A}}}$ =
(iv) A + A =
(v) A. A =
(vi) A + 1 =
Answer:
(i) A+ $\overline{\mathrm{A}}$ = 1
(ii) A. $\overline{\mathrm{A}}$ = 0
(iii) $\overline{\overline{\mathrm{A}}}$ = A
(iv) A + A = A
(v) A . A = A
(vi) A + 1 = 1

Question 10.
Draw the logic circuit of Bubbled AND Gate and explain.
Answer:
The Logic Circuit of Bubbled AND Gate

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 9

In the above circuit, invertors on the input lines of the above circuit, invertors on the input lines of the AND gate gives the output as C = ($\overline{\mathrm{A}}$ . $\overline{\mathrm{B}}$)This circuit can be redrawn as the bubbles on the inputs, where the bubbles represent inversion.

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 10

It is referred as bubbled AND gate.

If A = 0 and B = 0 C = ($\overline{0} . \overline{0}$) = 1 . 1 = 1
If A = 0 and B = 1 C = ($\overline{0} . \overline{1}$) = 1 . 0 = 0
If A = 1 and B = 0 C = ($\overline{1} . \overline{0}$) = 0 . 1 = 0
If A = 1 and B = 1 C = ($\overline{1} . \overline{1}$) = 0 . 0 = 0

Here the truth table is

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 11

A bubbled AND gate produces the same output as a NOR gate. So, replace each NOR gate by a bubbled AND gate. The circuits are interchangeable.

Therefore,
$(\overline{\mathrm{A}+\mathrm{B}})=\overline{\mathrm{A}} \cdot \overline{\mathrm{B}}$
Which establishes the De Morgan’s second theorem.

Question 11.
Draw the logic circuit of Bubbled OR Gate and explain.
Answer:
The logic circuit of bubbled OR gate is

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 12

The output of this circuit can be written as
C = $\overline{\mathrm{A}}$ + $\overline{\mathrm{B}}$
The above circuit can be redrawn as the bubbles on the input, where the bubbles represents the inversion.

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 13

It is referred as bubbled OR gate. The truth table for the bubbled OR is

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 14

Comparing the truth tables of the bubbled OR gate with NAND gate, they are identical. So the circuits are interchangeable.

Therefore,

$(\overline{\mathrm{A} \cdot \mathrm{B}})=\overline{\mathrm{A}}+\overline{\mathrm{B}}$

which establishes the De Morgan’s second theorem.

Question 12.
Draw the symbol of logic agtes and their corresponding Truth tables.
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 15

Question 13.
Explain XOR gate with truth table.
Answer:
The XOR (exclusive – OR) gate acts in the same way as the logical “either/or.” The output is “true” if either, but not both, of the inputs are “true”. The output is “false” if both inputs are “false” or if both inputs are “true”. The output is 1 if the inputs are different, but 0 if the inputs are the same. The logic circuit of XOR gate is

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 16

The output of the XOR gate is
The truth table for XOR gate is

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 17

In boolean algebra, exclusive – OR operator © or “encircled plus”.
Hence, C = A © B
The logical symbol of XOR gate is

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 18

Question 14.
What is Boolean Algebra?
Answer:
It is a mathematical discipline that is used for designing digital circuits in a digital computer. It describes the relation between inputs and outputs of a digital circuit.

Question 15.
Write a short note on NAND Gate.
Answer:
The NAND gate operates an AND gate followed by a NOT gate. It acts in the manner of the logical operation “AND” followed by inversion. The output is “false” if both inputs are “true”, otherwise, the output is “true”. The output of the NAND gate is 0 if and only if both the inputs are 1, otherwise the output is 1.

Question 16.
Draw the truth table for XOR gate.
Answer:
The truth table for XOR gate is

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 19

Question 17.
Write the associative laws?
Answer:
A + (B + C) = (A + B) + C
A. (B . C) = (A . B) . C

Question 18.
What are derived gates?
Answer:
Logic gates like NAND, NOR, XOR and XNOR are derived gates which are derived from the fundamental gates.

Question 19.
Write the truth table of fundamental gates.
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 20

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 21

Question 20.
Write a short note on XNOR gate.
Answer:
The XNOR (exclusive – NOR) gate is a combination XOR gate followed by an inverter. Its output is “true” if the inputs are the same, and “false” if the inputs are different. In simple words, the output is 1 if the input are the same, otherwise the output is 0. The logic circuit of XNOR gate is

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 22

The output of the XNOR is NOT of XOR
C = A ⨁ B
= $\overline{\mathrm{A}}$ . B + A . $\overline{\mathrm{B}}$
= A B + $\overline{\mathrm{A}}$ $\overline{\mathrm{B}}$
(Using De Morgan’s Theorem)
In boolean algebra, ⊙ or “included dot” stands for the XNOR.
Therefore, C = A ⊙ B
The logical symbol is

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 23

Truth Table for XOR Gate

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 24

Question 21.
Reason out why the NAND and NOR are called universal gates?
Answer:
NAND and NOR gates are called Universal gates, because the fundamental logic gates can be realized through them.

Question 22.
Give the truth table of XOR gate.
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 25

Question 23.
Write the De Morgan’s law.
Answer:
De Morgan’s law $\overline{\mathrm{A}+\mathrm{B}}$ = A . $\overline{\mathrm{B}}$
($\overline{\mathrm{A} \cdot \mathrm{B}}$) = $\overline{\mathrm{A}}$ + $\overline{\mathrm{B}}$

Question 24.
Explain the fundamental gates with expression and truth table.
Answer:
The three fundamental gates namely AND, OR and NOT.
AND Gate:
The AND gate can have two or more input signals and produce an output signal. The output is “true” only when both inputs are “true”, otherwise, the output is “false”. The output will be 1 if and only if both inputs are 1; otherwise the output is 0. The output of the AND gate is represented by a variable say C, where A and B are two and if input boolean variables. In boolean algebra, a variable can take either of the values ‘0’ or ‘1’.

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 26

One way to symbolize the action of an AND gate is by writing the boolean function.
C = A AND B
In boolean algebra the multiplication sign stands for the AND operation. Therefore, the output of the AND gate is
C = A . B or simply C = AB
Read this as “C equals A AND B”. Since there are two input variables here, the truth table has four entries, because there are four possible inputs : 00, 01, 10 and 11.
For instance if both inputs are 0,
C = A .B = 0 . 0 = 0
The truth table for AND Gate is

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 27

OR Gate:
The OR gate behaves like the logical inclusive “OR”. The output is “true” if either or both of the inputs are “true”. If both inputs are “false” then the output is “false”. The output will be 1 if and only if one or both inputs are 1; otherwise, the output is 0. The logical symbol of the OR gate is

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 28

The OR gate output is
C = A OR B
We use the + sign to denote the OR function. Therefore,
C = A + B
Read this as “C equals A OR B”.
For instance, if both the inputs are 1
C = A + B = 1 + 1 = 1
The truth table for OR gate is

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 29

NOT Gate:
The NOT gate, called a logical inverter, has only one input. It reverses the logical state. The output C is always the complement of the input. The logical symbol of the NOT gate is

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 30

C = NOT A
In boolean algebra, the overbar stands for NOT operation. Therefore,
C = $\overline{\mathrm{A}}$
Read this as “C equals NOT A” or “C equals the complement of A”.
If A is 0,
C = $\overline{1}$ = 0
On the otherhand, if A is 1,
C = $\overline{1}$ = 0
The truth table for NOT gate is

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 31

Question 25.
How AND and OR can be realized using NAND and NOR gate.
Answer:
The output of NOR gate is
C = $\overline{\mathrm{A}+\mathrm{B}}$

The output of Bubbled AND gate is
C = $\overline{\mathrm{A}}$ . $\overline{\mathrm{B}}$

The truth table for both Bubbled AND and NOR gate is

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 32

From the above table, a bubbled AND gate produces the same output as a NOR gate. In this way we can realised AND gate using NOR gate.
The output of NAND gate is C = $\overline{\mathrm{A} \cdot \mathrm{B}}$
The output of Bubbled OR gate is C = $\overline{\mathrm{A}}$ + $\overline{\mathrm{B}}$

The truth table for both bubbled OR gate and NAND gate is

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 33

From the above table, a bubbled OR gate produces the same output as a NAND gate. In this way we can realised OR gate using NAND gate.

Question 26.
Explain the Derived gates with expression and truth table.
Answer:
The NAND gate operates an AND gate followed by a NOT gate. It acts in the manner of the logical operation “AND” followed by inversion. The output is “false” if both inputs are “true”, otherwise, the output is “true”. The output of the NAND gate is 0 if and only if both the inputs are 1, otherwise the output is 1. The logic circuit of NAND gate is

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 34

The logical symbol of NAND gate is

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 35

The output of the NAND gate is
C = ($\overline{\mathrm{A} \cdot \mathrm{B}}$)

Read this as “C equals NOT of A AND B” or “C equals the complement of A and B”.

For example if both the inputs are 1

C = $(\overline{1.1})=\overline{1}$ = 0
The truth table for NAND gate is

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 36

TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 37

Choose the correct answer:

Question 1.
The AND operator is defined in Boolean algebra by the use of the operator
(a) +
(b) –
(c) *
(d) .
Answer:
(d) .

Question 2.
The plus sign is used to indicate the ______ operator.
(a) AND
(b) OR
(c) NOT
(d) NAND
Answer:
(b) OR

Question 3.
The _______ is the combination of NOT and AND.
(a) NAND
(b) XOR
(c) XNOR
(d) NOT
Answer:
(a) NAND

Question 4.
Which gate is the combination XOR gate followed by the inverter?
(a) XNOR
(b) XOR
(c) OR
(d) NOR
Answer:
(a) XNOR

Question 5.
How many fundamental logic gates?
(a) 1
(b) 2
(c) 3
(d) 4
Answer:
(c) 3

Question 6.
A + 0 is:
(a) 1
(b) 0
(c) A
(d) $\overline{\mathrm{A}}$
Answer:
(c) A

Question 7.
A. $\overline{\mathrm{A}}$ is:
(a) A
(b) 0
(c) $\overline{\mathrm{A}}$
(d) 1
Answer:
(b) 0

Question 8.
A + A is:
(a) 2A
(b) A²
(c) A
(d) +1
Answer:
(c) A

Question 9.
A + 1 is:
(a) 1A
(b) A
(c) 1
(d) 2A
Answer:
(c) 1

Question 10.
________ Gate is called logic inverter.
(a) OR
(b) NOT
(c) AND
(d) None
Answer:
(b) NOT

Question 11.
Who proposed the basic principles of Algebra?
(a) George Boole
(b) George William
(c) George Kingston
(d) George Barsley
Answer:
(a) George Boole

Question 12.
The variable which can stored truth values are called:
(a) Logical variable
(b) Binary valued variables
(c) Boolean variable
(d) All the above
Answer:
(d) All the above

Question 13.
The basic logical operations symbol are also called:
(a) Arithmetic operators
(b) Logical operators
(c) Conditional operators
(d) Relational operators
Answer:
(b) Logical operators

Question 14.
Which logical operator has one input and one output?
(a) AND
(b) OR
(c) NOT
(d) NAND
Answer:
(c) NOT

Question 15.
Which operator is generated by inverting the output of an AND operator?
(a) NAND
(b) NOT
(c) OR
(d) NOR
Answer:
(a) NAND

Question 16.
Which operator is the combination of NOT and OR?
(a) NAND
(b) NOT
(c) OR
(d) NOR
Answer:
(d) NOR

Question 17.
Which operator is generated by inverting the output of an OR operator?
(a) NOR
(b) NAND
(c) NOT
(d) OR
Answer:
(a) NOR

Question 18.
Which operator uses multiplication sign in boolean algebra?
(a) NOR
(b) NOT
(c) AND
(d) OR
Answer:
(c) AND

Question 19.
Which gate gets its name from its behaviour like the logical inclusive?
(a) OR
(b) AND
(c) NOT
(d) NAND
Answer:
(a) OR

Question 20.
Which gate circuit is an OR gate followed by an inverter?
(a) NAND
(b) NOR
(c) NOT
(d) AND
Answer:
(b) NOR

Question 21.
⊙ – (included dot) stands for the:
(a) XNOR
(b) XOR
(c) NAND
(d) NOR
Answer:
(a) XNOR

Question 22.
Which of the logic gates are found in digital integrated circuits?
(a) gates
(b) arrays
(c) operation
(d) physical space
Answer:
(b) arrays

Question 23.
A + $\overline{\mathrm{A}}$ is:
(a) 0
(b) 1
(c) A
(d) $\overline{\mathrm{A}}$
Answer:
(b) 1

Question 24.
A.A is:
(a) 0
(b) 1
(c) A
(d) $\overline{\mathrm{A}}$
Answer:
(c) A

Question 25.
A.0 is:
(a) 0
(b) 1
(c) A
(d) $\overline{\mathrm{A}}$
Answer:
(a) 0

Question 26.
$(\overline{\overline{\mathrm{A}})}$ is:
(a) 0
(b) 1
(c) A
(d) $\overline{\mathrm{A}}$
Answer:
(c) A

Question 27.
The symbol of NOT gate is:
(a) TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 1

(b) TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 2

(d) TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 4

Answer:

(a) TN State Board 11th Computer Science Important Questions Chapter 2 Boolean Algebra Part 2 1

Question 28.
Choose the odd man out:
(a) F
(b) E
(c) D
(d) H
Answer:
(d) H

Question 29.
Choose the odd man out:
(a) AND
(b) OR
(c) NOR
(d) NOT
Answer:
(c) NOR

Question 30.
Match the following:

(i) AND Operator	(a) Y = A + B
(ii) OR Operator	(b) Y= $\overline{\mathrm{A}}$
(iii) NOT Operator	(c) Y = $\overline{\mathrm{A} \cdot \mathrm{B}}$
(iv) NAND Operator	(d) Y = A . B

Answer:

(a) (i) – (a); (ii) – (b); (iii) – (c); (iv) – (d)
(b) (i) – (b); (ii) – (a); (iii) – (c); (iv) – (d)
(c) (i) – (c); (ii) – (b); (iii) – (d); (iv) – (a)
(d) (i) – (d); (ii) – (a); (iii) – (b); (iv) – (c)
Answer:
(d) (i) – (d); (ii) – (a); (iii) – (b); (iv) – (c)

Question 31.
Match the following:

(i) A + 0	(a) A + B
(ii) A . $\overline{\mathrm{A}}$	(b) 1
(iii) A + 1	(c) 0
(iv) A . $\overline{\mathrm{A}}$ . B	(d) A

(a) (i) – (d); (ii) – (c); (iii) – (b); (iv) – (a)
(b) (i) – (c); (ii) – (b); (iii) – (a); (iv) – (d)
(c) (i) – (d); (ii) – (b); (iii) – (a); (iv) – (c)
(d) (i) – (d); (ii) – (a); (iii) – (b); (iv) – (c)
Answer:
(a) (i) – (d); (ii) – (c); (iii) – (b); (iv) – (a)

Question 32.
Choose the incorrect pair:

Column I	Column II
(a) A + B	B + A
(b) A + (A . B)	A
(c) A + $\overline{\mathrm{A}}$ . B	A . B
(d) $\overline{\mathrm{A}+\mathrm{B}}$	$\overline{\mathrm{A}}$ . $\overline{\mathrm{B}}$

Answer:
(c)

Question 33.
Assertion (A):
The NAND gate operates on OR gate followed by a NOT gate.
Reason (R):
It acts in the manner of the logical operation ‘AND’ followed by inversion.
(a) Both A and R are true, and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Answer:
(d) A is false, but R is true.

Question 34.
Assertion (A):
The XOR(exclusive-OR) gate acts in the same way as the logical ‘either/or’.
Reason (R):
The output is ‘true’ if either, but not both of the inputs are ‘true’.
(a) Both A and R are true, and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Answer:
(a) Both A and R are true, and R is the correct explanation for A.

Question 35.
Which is a basic electronic circuit which operates on one or more signals?
(a) Boolean algebra
(b) Gate
(c) Fundamental gates
(d) Derived gates
Answer:
(b) Gate

Question 36.
Which gate is called as the logical inverter?
(a) AND
(b) OR
(c) NOT
(d) XNOR
Answer:
(c) NOT

Question 37.
A + A = ?
(a) A
(b) O
(c) 1
(d) A
Answer:
(a) A

Question 38.
NOR is a combination of ?
(a) NOT(OR)
(b) NOT(AND)
(c) NOT(NOT)
(d) NOT(NOR)
Answer:
(a) NOT(OR)

Question 39.
NAND is called as ________ Gate.
(a) Fundamental Gate
(b) Derived Gate
(c) Logical Gate
(d) Electronic Gate
Answer:
(b) Derived Gate

TN Board 11th Computer Science Important Questions

TN Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1

October 19, 2021

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1

Question 1.
Define word length.
Answer:
Word length refers to the number of bits processed by a Computer’s CPU. A word length can have 8 bits, 16 bits, 32 bits and 64 bits (Present Computers use 32 bits or 64 bits).

Question 2.
Define byte.
Answer:
A collection of 8 bits is called Byte. A byte is considered as the basic unit of measuring the memory size in the computer.

Question 3.
What is a bit?
Answer:
A bit is the short form of Binary digit which can be ‘0’ or ‘ 1 ’. It is the basic unit of data in computers.

Question 4.
What is Decimal Number System?
Answer:
It consists of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 (10 digits). It is the oldest and most popular number system used in our day-to-day life. In the positional number system, each decimal digit is weighted relative to its position in the number. It means that each digit in the number is multiplied by 10 raised to a power corresponding to that digit’s position.

Question 5.
What is meant by Octal Number System?
Answer:
Octal number system uses digits 0, 1, 2, 3, 4, 5, 6 and 7 (8 digits). Each octal digit has its own positional value or weight as a power of 8.

Question 6.
Convert (547)8 to its decimal equivalent?
Answer:
The Octal sequence (547)8 has the decimal equivalent:
(547)₈ = 5 × 8² + 4 × 8¹ + 7 × 8⁰
= 5 × 64 + 4 × 8 + 7 × 1
= 320 + 32 + 7 = (359)₁₀

Question 7.
(11.011)₂ convert into decimal number.
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 1

= 3 + (0 × 0.5 + 1 × 0.25 + 1 × 0.125)
= 3 + 0 + 0.25 + 0.125 = (3.375)₁₀

Question 8.
(6213)₈ convert into binary number.
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 2

Question 9.
What is a character set?
Answer:
In general, 26 uppercase letters, 26 lowercase letters, 0 to 9 digits and special characters are used in a computer is called character set. All these character set are denoted through numbers only.

Question 10.
Convert (65)₁₀ into its equivalent binary number.
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 3

Question 11.
How will you convert decimal to octal? Give example.
Answer:
To convert Decimal to Octal, “Repeated Division by 8” method can be used. Here, we have to divide the given number by 8.
Eg: Convert (65)₁₀ into its equivalent Octal Number.

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 4

Question 12.
Write octal numbers and their binary equivalent.
Answer:

Octal	Binary Equivalent
0	000
1	001
2	010
3	011
4	100
5	101
6	110
7	111

Question 13.
In what ways the numbers are represented in computers?
Answer:
The numbers are represented in computers in different ways:
(i) Signed Magnitude representation.
(ii) 1 ’s Complement.
(iii) 2’s Complement.

Question 14.
Convert (11010110)₂ into octal equivalent.
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 5

Question 15.
Convert the following binary numbers to decimal
(i) 11101,
(ii) 1011010.
Answer:
(i) 11101

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 6

(ii) 1011010

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 7

Question 16.
Convert (3EF)16 to decimal.
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 8

Question 17.
Convert (111011)₂ into its equivalent decimal number.
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 9

Question 18.
Write short note on hexadecimal number system.
Answer:
A hexadecimal number is represented using base 16. Hexadecimal or Hex numbers are used as a shorthand form of binary sequence. This system is used to represent data in a more compact manner. Since 16 symbols are used, 0 to F, the notation is called hexadecimal. The first 10 symbols are the same as in the decimal system, 0 to 9 and the remaining 6 symbols are taken from the first 6 letters of the alphabet sequence, A to F, where A represents 10, B is 11, C is 12, D is 13, E is 14 and F is 15.
Eg: The hexadecimal sequence (25)16 has the decimal equivalent:
(25)16 = 2 × 161 + 5 × 160
= 32 + 5 = (37)10

Question 19.
Write the hierarchy of data representation.
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 10

Question 20.
Write the steps for binary to decimal conversion.
Answer:
To convert Binary to Decimal we can use
positional notation method.
Step 1: Write down the Binary digits and list the powers of 2 from right to left (Positional Notation)
Step 2: For each positional notation written for the digit, now write the equivalent weight.
Step 3: Multiply each digit with its corresponding weight.
Step 4: Add all the values.

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 11

Question 21.
How will you convert binary to octal?
Answer:
Step 1: Group the given binary number into 3 bits from right to left.
Step 2: You can add preceding 0 to make a group of 3 bits if the left most group has less than 3 bits.
Step 3: Convert equivalent octal value using “2’s power positional weight method”.
Eg: Convert (11010110)₂ to its Octal equivalent.

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 12

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 13

Question 22.
Write the steps for converting binary to hexadecimal.
Answer:
Step 1: Group the given number into 4 bits from right to left.
Step 2: You can add preceding 0’s to make a group of 4 bits if the left most group has less than 4 bits.
Step 3: Convert equivalent Hexadecimal value using “2’s power positional weight method”.
Eg: Convert (111 1010110)₂ to Hexadecimal.

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 14

[Note: 0’s are added to the left most group to make it a group of 4 bits]

Question 23.
Write the steps for octal to decimal conversion.
Answer:
To convert octal to decimal, we can use positional notation method.
(i) Write down the octal digits and list the powers of 8 from right to left(Positional Notation).
(ii) For each positional notation of the digit write the equivalent weight.
(iii) Multiply each digit with its corresponding weight.
(iv) Add all the values.
Eg: Convert (1265)₈ to equivalent Decimal number.

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 15

(1265)₈ = 512 × 1 + 64 × 2 + 8 × 6 + 1 × 5
= 512 + 128+ 18 + 5
(1265)₈ = (693)₁₀

Question 24.
Write the steps for converting hexadecimal to decimal.
Answer:
To convert Hexadecimal to Decimal we canuse positional notation method.
(i) Write down the Hexadecimal digits and list the powers of 16 from right to left (Positional Notation).
(ii) For each positional notation written for the. digit, now write the equivalent weight.
(iii) Multiply each digit with its corresponding weight.
(iv) Add all the values to get one final value.
Eg: Convert (25F)₁₆ into its equivalent Decimal number.

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 16

(25F)₁₆ = 2 × 256 + 5 × 16 + 15 × 1
= 512 + 80 + 15
(25F)₁₆ = (607)₁₀

Question 25.
Write short note on signed magnitude representation.
Answer:
The value of the whole numbers can be determined by the sign used before it. If the number has ‘+‘ sign or no sign it will be considered as positive. If the number has ‘—‘ sign it will be considered as negative.
Eg: +43 or 43 is a positive number.
– 43 is a negative number.

In signed binary representation, the left most bit is considered as sign bit. If this bit is O, it is a positive number and if it is 1, it is a negative number. Therefore a signed binary number has 8 bits, only 7 bits used for storing values (magnitude) and the 1 bit is used for sign.
+ 43 is represented in memory as follows:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 17

– 43 is represented in memory as follows:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 18

Question 26.
Write 2’s complement procedure with example.
Answer:
The 2’s complement method for negative number is as follows:
(i) Invert all the bits in the binary sequence
(i.e., change every 0 to 1 and every 1 to 0 i.e.,1‘s complement).
(ii) Add I to the result to the Least Significant Bit (LSB).
Eg: 2’s Complement represent of (-24)₁₀
Binary equivalent of +24 = 11000
8bit format = 00011000
1’s complement = 11100111
Add 1 to LSB = +1
2’s complement of -24 = 11101000

Question 27.
Write short note unicode.
Answer:
Unicode is used in most of the modem computers. The popular coding scheme after ASCII is Unicode. ASCII can represent only 256 characters. ‘English and European Languages alone can be handled by ASCII.
Languages like Tamil, Malayalam, Kannada and Telugu could not be represented by ASCII. Hence, the Unicode was generated to handle all the coding system of Universal languages. Unicode is 16 bit code and can handle 65536 characters.

Question 28.
Give the steps to convert fractional binary to decimal equivalent with example.
Answer:
Step 1:
Convert integral part of Binary to Decimal equivalent using positional notation method.

Step 2:
To convert, the fractional part of binary to its decimal equivalent.

Step 2.1:
Write down the Binary digits in the fractional part.

Step 2.2:
For all the digits write powers of 2 from left to right starting from 2^-1, 2^-2, 2^-3, ………….2^-n, now write the equivalent weight.

Step 2.3:
Multiply each digit with its corresponding weight.

Step 2.4:
Add all the values which you obtained in Step 2.3.

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 19

Step 3:
To get final answer write the integral part (after conversion), followed by a decimal point(.) and the answer arrived at

Step 2.4.
Eg: Convert the given Binaxy number(11.011)₂ into its decimal equivalent Integer part
(11)₂ = 3.

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 20

3 + (0 × 0.5 + 1 × 0.25 + 1 × 0.125) = 3.375
3 + 0.75 = 3.75
(11.011)₂ = (3.375)₁₀

Question 29.
Explain in detail the different encoding systems used for computer.
Answer:
There are several encoding systems used for computer. They are –
(i)Binary Coded Decimal (BCD):
It is 26 bit encoding system. It can handle 26 = 64 characters only. This encoding system is not in the practice right now.

(ii)American Standard Code for information Interchange (ASCII):
This is the most popular encoding system recognized by United States. Most of the computers use this system. This encoding system can handle English characters only. This can handle 27 bit which means 128 characters. Here each character has individual number.

The new edition (version) ASCII – 8, has 28 bits and can handle 256 characters represented from 0 to 255 unique umbers.

The ASCII code equivalent to the uppercase letter ‘A’ is 65. The binary representation of ASCII (7 bit) value is 1000001. Also 01000001 in ASCII-8 bit.

(iii)Extended Binary Coded Decimal Interchange Code (EBCDIC):
This is similar to ASCII Code with 8 bit representation. This coding system is formulated by International Business Machine(IBM). The coding system can handle 256 characters. The input code in ASCII can be converted to EBCDIC system and vice – versa.

(iv)Indian Standard Code for Information Interchange (ISCII):
ISCII is the system of handling the character of Indian local languages. This is a 8-bit coding system and can handle 256 (28) characters. It is formulated by the department of Electronics in India in the year 1986- 88 and recognized by Bureau of Indian Standards (BIS). Now this coding system is integrated with Unicode.

(v) Unicode:
This coding system is used in most of the modem computers. The popular coding scheme after ASCII is Unicode. ASCII can represent only 256 characters. Therefore English and European Languages alone can be
handled by ASCII. Languages like Tamil, Malayalam, Kannada and Telugu could not be represented by ASCII. Hence, the Unicode was generated to handle all the coding system of Universal languages. This is 16 bit code and can handle 65536 characters.

Question 30.
Identify the number system for the following numbers.
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 21

Question 31.
State whether the following numbers are valid or not. If invalid, give reason.
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 22

Question 32.
Convert the following Decimal numbers to its equivalent Binary, Octal, Hexadecimal.
(i) 1920,
(ii) 255,
(iii) 126.
Answer:
(i) 1920

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 23

(ii) 255

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 24

(iii) 126

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 25

Question 33.
Convert the given Binary number into its equivalent Decimal, Octal and Hexadecimal number.
(i) 101110101, (ii) 1011010, (iii) 101011111.

(i) 101110101 into Decimal number
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 26

(ii) 1011010 to Decimal
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 27

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 28

(iii) 101011111 to Decimal
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 29

Question 34.
Convert the foltowing Octal numbers into Binary numbers.
(a) 472, (b) 145, (c) 347, (d) 6247, (e) 645.

(a) 472
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 30

(b) 145
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 31

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 32

(d) 6247
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 33

(e) 645
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 34

Question 35.
Convert the following Hexadecimal numbers to Binary numbers:
(a) A6, (b) BE, (c) 9BC8, (d) BC9.

(a) A6
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 35

(b) BE
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 36

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 37

(d) BC9
Answer:
B → 11 C → 12

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 38

Question 36.
Write the l’s complement number and 2’s complement number for the following decimal numbers:
(a) 22 (b) -13 (c) -65 (d) -46

(a) – 22 → 10110₂
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 39

(b) -13 → 1101
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 40

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 41

(d) -46 → 101110₂
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 42

Question 37.
Perform the following binary computations:
(a) 10₁₀ + 15₁₀
(b) – 12₁₀ + 5₁₀
(c) 14₁₀ – 12₁₀
(d) (-2)₁₀ – (- 6₁₀).

(a) 10₁₀ + 15₁₀
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 43

(b) – 12₁₀ + 5₁₀
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 44

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 45

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 46

[The final carry bit is lost because it cannot be accommodated in the 8 – bit register]

(d) (-2)₁₀ – (- 6₁₀)
Answer:
-2 = 10
8 bit from = 00000010
1’s complement = 11111101

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 47

Question 38.
What is data?
Answer:
The term data comes from the word datum, which means a raw fact. The data is a fact about people, places or some objects.
Eg: Let ‘Name’, ‘Age’, ‘Class’, ‘Marks’ and ‘Subject’ be some defined variables. Assign a value to each of these variables.
Name = Rajesh
Age = 16
Class = XI
Mark = 65
Subject = Computer Science
Here, the values assigned to the five different variables are called data.

Question 39.
Write the l’s complement procedure.
Answer:
Step 1: Convert the given Decimal number into Binary
Step 2: Check if the binary number contains 8 bits , if less add 0 at the left most bit, to make it as 8 bits.
Step 3: Invert all bits (i.e.,s Change 1 as 0 and 0 as 1)

Question 40.
Convert (46)₁₀ into Binary number.
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 48

Question 41.
We cannot find l’s complement for (28)₁₀. State reason.
Answer:
1 ’s complement representation is an easier approach to represent signed numbers. This is for negative numbers only. This (28)₁₀ this whole numbers cannot be determined by negative number because the number whose MSB is 1.

Question 42.
List the encoding systems for characters in memory.
Answer:
There are several encoding systems used for computer. They are
(i) BCD: Binary Coded Decimal.
(ii) EBCDIC: Extended Binary Coded Decimal Interchange Code.
(iii) ASCII: American Standard Code for Information Interchange.
(iv) Unicode
(v) ISCII: Indian Standard Code for Information Interchange.

Question 43.
What is radix of a number system? Give example.
Answer:
A numbering system is a way of representing numbers. The most commonly used numbering system in real life is Decimal number system. Other number systems are Binary, Octal, Hexadecimal number system. Each number system is uniquely identified by its base value or radix. Radix or base is the count of number of digits in each number system. Radix or base is the general idea behind positional numbering system.
Eg:(123)₁₀, (547)₈, (1001)₂, (25)₁₆.
In this, 10, 8, 2, 16 are radix or base value.

Question 44.
Write note on binary number system.
Answer:
There are only two digits in the Binary system, 0 and 1. The numbers in the binary system are represented to the base 2 and the positional multipliers are the powers of 2. The left most bit in the binary number is called as the Most Significant Bit (MSB) and it has the largest positional weight. The right most bit is the Least Significant Bit (LSB) and has the smallest positional weight.

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 49

Eg: The binary sequence (1101)₂ has the decimal equivalent:
(1101)₂ = 1 × 2³ + 1 × 2² + 0 × 2¹ + 1 × 2⁰
= 8 + 4 + 0 + 1 =(13)₁₀

Question 45.
Convert (150)₁₀ into Binary, then convert that Binary number to Octal.
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 50

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 51

Question 46.
Write short note on ISCII.
Answer:
ISCII is the system of handling the character of Indian local languages. This is a 8-bit coding system. So it can handle 256 (28) characters. This system is formulated by the department of Electronics in India in the year 1986-88 and recognized by Bureau of Indian Standards (BIS). Now this coding system is integrated with Unicode.

Question 47.
Add: (i)-22₁₀ + 15₁₀;
(ii) 20₁₀ + 25₁₀.

(i) -22₁₀ + 15₁₀
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 52

(ii) 20 + 25
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 53

Question 48.
(a) Write the procedure to convert fractional Decimal to Binary.
(b) Convert (98.46)₁₀ to Binary.
Answer:
(a) The method of repeated multiplication by 2 has to be used to convert such kind of decimal fractions.
The steps involved in the method of repeated multiplication by 2:

Step 1: Multiply the decimal fraction by 2 and note the integer part. The integer part is either 0 or 1.
Step 2: Discard the integer part of the previous product. Multiply the fractional part of the previous product by 2. Repeat Step 1 until the same fraction repeats or terminates (0).
Step 3: The resulting integer part forms a sequence of 0s and Is that become the binary equivalent of decimal fraction.
Step 4: The final answer is to be written from first integer part obtained till the last integer part obtained.

(b) (98.46)₁₀
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 54

Question 49.
Find 1’s Complement and 2’s Complement for the following Decimal number: (a) – 98,
(b) -135.
(a) – 98
Answer:
First, convert given decimal number into binary.

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 55

Binary number = 1100010₂
Second, check binary number as 8 bits, If less add 0 as the left most bit, 01100010
Third, Invert all bits (change 1 as 0 and 0 as 1) 1 ’s complement for 10011101.
2’s complement:
Binary equivalent of + 98 = 1100010
8 bit format = 01100010
1 ’s complement = 10011101
Add 1 to LSB = 1
10011110
2’s complement of – 98 = 10011110₂

(b) – 135
Answer:
First, convert given decimal number into Binary.

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 56

Second, check binary number as 8 bits, If less add 0 at the left most bit. It has 8 bits, 10000111.
Third, Invert all bits (change 1 as 0 and 0 as 1) 1 ’s complement for 01111000.

2’s complement:
Binary equivalent of + 135 = 10000111
8 bit format = 10000111
1 ’s complement = 01111000
Add 1 to LSB = 1
01111001
2’s complement of- 135 = 01111001₂

Question 50.
(a) Add 1101010₂+ 101101₂
(b) Subtract 1101011₂ – 111010₂

(a) Add 1101010₂+ 101101₂
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 57

(b) Subtract 1101011₂ – 111010₂
Answer:

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 58

1101011₂ – 111010₂

TN State Board 11th Computer Science Important Questions Chapter 2 Number Systems Part 1 59

1101011₂ – 111010₂ = 110001₂

Choose the correct answer:

Question 1.
A bit is the short form of:
(a) binary data
(b) binary digit
(c) binary decimal
(d) big digit
Answer:
(b) binary digit

Question 2.
A ________ is a collection of 4 bits.
(a) bit
(b) byte
(c) nibble
(d) word length
Answer:
(c) nibble

Question 3.
A collection of 8 bits is called:
(a) bit
(b) byte
(c) word length
(d) nibble
Answer:
(b) byte

Question 4.
2^40 is referred as:
(a) mega
(b) giga
(c) peta
(d) tera
Answer:
(d) tera

Question 5.
2^70 is referred as:
(a) peta
(b) exa
(c) zetta
(d) yotta
Answer:
(c) zetta

Question 6.
1024 GB is referred as :
(a) kilo byte
(b) mega byte
(c) giga byte
(d) tera byte
Answer:
(d) tera byte

Question 7.
____________ are used to represent characters in a text.
(a) Bits
(b) Bytes
(c) Nibble
(d) Wordlength
Answer:
(b) Bytes

Question 8.
The ASCII value for blank space is:
(a) 32
(b) 91
(c) 48
(d) 65
Answer:
(a) 32

Question 9.
The ASCII value for numeric 0 is:
(a) 32
(b) 97
(c) 48
(d) 65
Answer:
(c) 48

Question 10.
Each number system is uniquely identified by its:
(a) decimal value
(b) binary value
(c) base value or radix
(d) octal value
Answer:
(c) base value or radix

Question 11.
The range of ASCII values for lower case alphabets is from:
(a) 97 to 122
(b) 65 to 90
(c) 98 to 122
(d) 97 to 123
Answer:
(a) 97 to 122

Question 12.
The range of ASCII values for upper case alphabets is from:
(a) 97 to 122
(b) 65 to 90
(c) 66 to 90
(d) 65 to 97
Answer:
(b) 65 to 90

Question 13.
The expansion of MSB is:
(a) Most Significant Bit
(b) Most Signed Bit
(c) Must Significant Bit
(d) Must Signed Bit
Answer:
(a) Most Significant Bit

Question 14.
The expansion of LSB is:
(a) Lower Significant Bit
(b) Least Significant Bit
(c) Lower Signed Bit
(d) Least Signed Bit
Answer:
(b) Least Significant Bit

Question 15.
Radix of octal number is:
(a) 2
(b) 10
(c) 16
(d) 8
Answer:
(d) 8

Question 16.
The binary sequence (1101)₂ has the decimal equivalent:
(a) (25)₁₀
(b) (15)₁₀
(c) (17)₁₀
(d) (13)₁₀
Answer:
(d) (13)₁₀

Question 17.
In hexadecimal C represents:
(a) 11
(b) 10
(c) 12
(d) 15
Answer:
(c) 12

Question 18.
The simplest method to represent negative binary numbers is called:
(a) signed magnitude
(b) unsigned magnitude
(c) magnitude bit
(d) unmagnitude bit
Answer:
(a) signed magnitude

Question 19.
EBDIC coding system can handle characters.
(a) 64
(b) 255
(c) 256
(d) 128
Answer:
(c) 256

Question 20.
The most commonly used coding scheme is the:
(a) Binary Coded Decimal
(b) Extended Binary Coded Decimal Interchange Code
(c) Indian Standard Code for Information Interchange
(d) American Standard Code for Information Interchange
Answer:
(d) American Standard Code for Information Interchange

Question 21.
Which is the basic unit of measuring the memory size in the computer?
(a) bit
(b) byte
(c) nibble
(d) word length
Answer:
(b) byte

Question 22.
What is the most commonly used numbering system in real life?
(a) Binary
(b) Octal
(c) Decimal
(d) Hexadecimal
Answer:
(c) Decimal

Question 23.
Which of the following is octal number?
(a) 1101
(b) 1178
(c) 778
(d) 8005
Answer:
(a) 1101

Question 24.
Which of the following is not a binary number?
(a) 2101
(b) 1000
(c) 1111
(d) 1001
Answer:
(a) 2101

Question 25.
Which of the following is a Hexadecimal number?
(a) 1234
(b) ABCD
(c) 1001
(d) All the above
Answer:
(d) All the above

Question 26.
Unicode is a ______ bit code.
(a) 8
(b) 16
(c) 32
(d) 64
Answer:
(b) 16

Question 27.
What is the 1 ’s complement for (-24)₁₀?
(a) 00011000
(b) 11100111
(c) 11110011
(d) 11100001
Answer:
(b) 11100111

Question 28.
Who formulated ASCII coding system?
(a) Microsoft
(b) Oracle
(c) IBM
(d) SVN
Answer:
(c) IBM

Question 29.
What is the ASCII value of A in decimal number?
(a) 65
(b) 66
(c) 67
(d) 68
Answer:
(a) 65

Question 30.
ISCII coding system is formulated by:
(a) Electronics in India
(b) IBM
(c) Oracle corporation
(d) Sun micro systems
Answer:
(a) Electronics in India

Question 31.
Which coding system is used in most of the modern computers?
(a) ASCII
(b) BCD
(c) ISCII
(d) Unicode
Answer:
(d) Unicode

Question 32.
Unicode scheme is denoted by:
(a) Binary numbers
(b) Octal numbers
(c) Hexadecimal numbers
(d) Decimal numbers
Answer:
(c) Hexadecimal numbers

Question 33.
What is the ASCII value of a in decimal number?
(a) 95
(b) 96
(c) 97
(d) 98
Answer:
(c) 97

Question 34.
What is the ASCII value of * symbol in Hexadecimal number?
(a) 2B
(b) 2A
(c) 2C
(d) 2D
Answer:
(b) 2A

Question 35.
What is the ASCII value of @ symbol in octal number?
(a) 111
(b) 571
(c) 100
(d) 123
Answer:
(c) 100

Question 36.
Unicode can handle characters.
(a) 65536
(b) 75536
(c) 66535
(d) 85536
Answer:
(a) 65536

Question 37.
BCD can handle _______ characters only.
(a) 65
(b) 75
(c) 64
(d) 94
Answer:
(c) 64

Question 38.
ASCII can handle characters.
(a) 365
(b) 128
(c) 256
(d) 255
Answer:
(b) 128

Question 39.
________ can handle all the coding system of universal languages.
(a) Unicode
(b) ISCII
(c) EBCDIC
(d) BCD
Answer:
(a) Unicode

Question 40.
Choose the odd man out:
(a) Bit
(b) Byte
(c) Nibble
(d) IBM
Answer:
(d) IBM

Question 41.
Choose the odd man out:
(a) Octal variable
(b) Logical variable
(c) Binary valued variable
(d) Boolean variable
Answer:
(a) Octal variable

Question 42.
Match the following:

(i) (1010)₂	(a) Octal
(ii) (989)₁₆	(b) Binary
(iii) (750)₈	(c) Decimal
(iv) (926)₁₀	(d) Hexadecimal

(a) (i) – (d); (ii) – (a); (iii) – (b); (iv) – (c)
(b) (i) – (b); (ii) – (d); (iii) – (a); (iv) – (c)
(c) (i) – (b); (ii) – (a); (iii) – (d); (iv) – (c)
(d) (i) – (d); (ii) – (b); (iii) – (a); (iv) – (c)
Answer:
(b) (i) – (b); (ii) – (d); (iii) – (a); (iv) – (c)

Question 43.
Match the following:

Hexadecimal	Binary
(i) A	(a) 1101
(ii) B	(b) 1010
(iii) D	(c) 1110
(iv) E	(d) 1011

(a) (i) – (d); (ii) – (b); (iii) – (a); (iv) – (c)
(b) (i) – (c); (ii) – (d); (iii) – (a); (iv) – (b)
(c) (i) – (b); (ii) – (d); (iii) – (a); (iv) – (c)
(d) (i) – (b); (ii) – (a); (iii) – (d); (iv) – (c)
Answer:
(c) (i) – (b); (ii) – (d); (iii) – (a); (iv) – (c)

Question 44.
Match the following:

(i) BCD	(a) 0 – 15
(ii) EBCDIC	(b) 65536 characters
(in) Unicode	(c) 256 characters
(iv) Hexadecimal	(d) 64 characters

(a) (i) – (d); (ii) – (c); (iii) – (b); (iv) – (a)
(b) (i) – (d); (ii) – (a); (iii) – (b); (iv) – (c)
(c) (i) – (a); (ii) – (b); (iii) – (d); (iv) – (c)
(d) (i) – (c); (ii) – (a); (iii) – (d); (iv) – (b)
Answer:
(a) (i) – (d); (ii) – (c); (iii) – (b); (iv) – (a)

Question 45.
Choose the correct pair.

Column – I	Column – II
(a) 2	011
(b) 4	100
(c) 5	110
(d) 7	010

Answer:
(b)

Question 46.
Choose the incorrect pair.

Column – I	Column – II
(a) Kilo byte	2^10
(b) Mega byte	2^20
(c) Peta byte	2^50
(d) Exa	2^70

Answer:
(d)

Question 47.
Assertion (A):
The computer can understand only Machine language.
Reason (R):
The Machine language is 0 and 1.
(a) Both A and R are true, and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Answer:
(a) Both A and R are true, and R is the correct explanation for A.

Question 48.
Assertion (A):
A numbering system is a way of representing numbers.
Reason (R):
The most commonly used numbering system in real life is Binary number system.
(a) Both A and R are true, and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Answer:
(c) A is true, but R is false.

Question 49.
Assertion (A):
The popular coding scheme after ASCII is Unicode.
Reason (R):
The Unicode was generated to handle all the coding system of universal language.
(a) Both A and R are true, and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A
(c) A is true, but R is false.
(d) A is false, but R is true.
Answer:
(a) Both A and R are true, and R is the correct explanation for A.

Question 50.
A collection of 8 bits is called:
(a) bit
(b) byte
(c) word length
(d) nibble
Answer:
(b) byte

Question 51.
The ASCII value for numeric 0 is:
(a) 32
(b) 97
(c) 48
(d) 65
Answer:
(c) 48

Question 52.
The expansion of LSB is:
(a) Lower Significant Bit
(b) Least Significant Bit
(c) Lower Significant Bit
(d) Least Signed Bit
Answer:
(b) Least Significant Bit

Question 53.
Which refers to the number of bits processed by a computer’s CPU?
(a) Byte
(b) Nibble
(c) Word length
(d) Bit
Answer:
(c) Word length

Question 54.
How many bytes does 1 KiloByte contain?
(a) 1000
(b) 8
(c) 4
(d) 1024
Answer:
(d) 1024

Question 55.
Expansion for ASCII:
(a) American School Code for Information Interchange
(b) American Standard Code for Information Interchange
(c) All Standard Code for Information Interchange
(d) American Society Code for Information Interchange
Answer:
(b) American Standard Code for Information Interchange

Question 56.
2^50 is referred as:
(a) kilo
(b) tera
(c) peta
(d) zetta
Answer:
(c) peta

Question 57.
How many characters can be handled in Binary Coded Decimal System?
(a) 64
(b) 255
(c) 256
(d) 128
Answer:
(a) 64

Question 58.
For 11012 what is the Hexadecimal equivalent?
(a) F
(b) E
(c) D
(d) B
Answer:
(c) D

Question 59.
What is the 1 ’s complement of 00100110?
(a) 00100110
(b) 11011001
(c) 11010001
(d) 00101001
Answer:
(b) 11011001

Question 60.
Which amongst this is not an Octal number?
(a) 645
(b) 234
(c) 876
(d) 123
Answer:
(c) 876

TN Board 11th Computer Science Important Questions

TN Board 11th Computer Science Important Questions Chapter 1 Introduction to Computers

October 18, 2021

TN State Board 11th Computer Science Important Questions Chapter 1 Introduction to Computers

Question 1.
What are Registers?
Answer:
Registers are the high speed temporary storage locations in the CPU. Although the number of registers varies from computer to computer, there are some registers which are common to all computers.

Question 2.
What type of challenges are frequently involved in natural language processing (NLP)?
Answer:
Speech Recognition, Natural Language Understanding and Natural Language Generation.

Question 3.
What is the function of Robotics?
Answer:
Robotics deals with the design, construction, operation and use of robots, as well as computer systems for their control, sensory feedback and processing.

Question 4.
What is Data?
Answer:
Data is defined as an unprocessed collection of raw facts, suitable for communication, interpretation or processing.
Eg: 134, 16 ‘Kavitha’, ‘C’ are data.

Question 5.
What is Information?
Answer:
Information is a collection of facts from which conclusions may be drawn. Data is the raw facts that is processed to give meaningful, ordered or structured information. Eg: Kavitha is 16 years old. This information is about Kavitha and conveys some meaning. This conversion of data into information is called data processing.

Question 6.
Write the different types of mouse.
Answer:
The different types of mouse are: Mechanical Mouse, Optical, Laser Mouse, Air Mouse, 3D Mouse, Tactile Mouse, Ergonomic Mouse and Gaming Mouse.

Question 7.
What is Track Ball?
Answer:
Track ball is similar to the upside-down design of the mouse. The user moves the ball directly, while the device itself remains stationary. The user spins the ball in various directions to navigate the screen movements.

Question 8.
Mention the uses of scanner.
Answer:
Scanners are used to enter the information directly into the computer’s memory. This device works like a Xerox machine. It converts any type of printed or written information including photographs into a digital format, which can be manipulated by the computer.

Question 9.
What is the use of plotters?
Answer:
Plotter is an output device that is used to produce graphical output on papers. It uses single color or multi color pens to draw pictures.

Question 10.
How printers are categorized?
Answer:
Printers are used to print the information on papers. They are divided into two main categories:
(i) Impact Printers.
(ii) Non-Impact Printers.

Question 11.
Name the types of Booting process?
Answer:
Booting process is of two types:
(i) Cold Booting.
(ii) Warm Booting.

Question 12.
What is meant by Cold Booting?
Answer:
When the system starts from initial state i.e., it is switched on, we call it Cold Booting or Hard Booting. When the user presses the Power button, the instructions are read from the ROM to initiate the booting process.

Question 13.
What is meant by Warm Booting?
Answer:
When the system restarts or when Reset button is pressed, we call it Warm Booting or Soft Booting. The system does not start from initial state and so all diagnostic tests need not be carried out in this case. There are chances of data loss and system damage as the data might not have been stored properly.

Question 14.
Write the performance of a Retinal Scanner?
Answer:
It performs a retinal scan which is a biometric technique that uses unique patterns on a person’s retinal blood vessels.

Question 15.
What is meant by Abacus?
Answer:
It is the first calculating device which led to an extremely high speed calculating devices.

Question 16.
What is a Artificial Neural Networks?
Answer:
It is one of the most dramatic changes in the sixth generation and will be the explosive growth of wide area networking. Natural Language Processing (NLP) is a component of Artificial Intelligence (AI).

Question 17.
What is developed using Deep Learning Neural Networks?
Answer:
Optical Character Recognition (Optical Grapheme Recognition) engine for the Indus scripts has been developed using Deep Learning Neural Networks (a sub-field of Artificial Intelligence).

Question 18.
What is mean by hardware?
Answer:
It is the physical component of a computer like motherboard, memory devices, monitor, keyboard etc.

Question 19.
What is known as IPO cycle?
Answer:
Task given to a computer follows an Input- Process-Output cycle (IPO cycle). It needs certain input, processes that input and produces the desired output.

Question 20.
What are the different types of keys available in the keyboard?
Answer:
Different set ofkeys available in the keyboard: Character keys, modifier keys, system and GUI keys, enter and editing keys, function keys, navigation keys, numeric keypad and lock keys.

Question 21.
What are the different actions using mouse?
Answer:
Move, click, double click, right click, drag and drop are the actions using mouse.

Question 22.
What is meant by booting?
Answer:
When the computer is switched on, the post will be executed and check if the devices are connected properly and ready to operate. If these devices are ready, then the BIOS gets executed. This process is called booting.

Question 23.
What is called bootstrap loader?
Answer:
After the booting process is over, a program called bootstrap loader transfers OS from hard disk into main memory. The OS will load and get executed. This is called bootstrap loader.

Question 24.
What is known as punched cards?
Answer:
Punch cards are paper cards containing several punched or perforated holes that were punched by hand or machine to represent data. They are also known as Hollerith cards.

Question 25.
What is meant by machine language?
Answer:
It is a collection of binary digits or bits that the computer reads and interprets.

Question 26.
What is meant by High level language?
Answer:
It is a computer programming language that isn’t limited by the computer, designed for a specific job, and is easier to understand.

Question 27.
What is meant by Nano technology?
Answer:
Nano technology is an engineering, science, and technology that develops machines or • works with one atom or one molecule that is 100 nanometers or smaller.

Question 28.
What is meant by bioengineering?
Answer:
It is a discipline that applies engineering principles of design and analysis to biological systems and biomedical technologies.

Question 29.
What is a mouse?
Answer:
Mouse (wired/wireless) is a pointing device used to control the movement of the cursor on the display screen. It can be used to select icons, menus, command buttons or activate something on a computer. Some mouse actions are move, click, double click, right click, drag and drop.

Question 30.
What are the variety of mouse available?
Answer:
Mechanical Mouse, Optical and Laser Mouse, Air Mouse, 3D Mouse, Tactile Mouse, Pucks, Ergonomic Mouse and Gaming Mouse are the available mouses. Among all Mechanical and Optical and Laser mouse is very familiar.

Question 31.
What are the two types of printers? Give example.
Answer:
Printers are used to print the information on papers. They are divided into two main categories:
(i) Impact Printers and
(ii) Non Impact printers

(i) Impact Printers:
These printers print with striking of – hammers or pins on ribbon. These printers can print on multi-part (using carbon papers) by using mechanical pressure. Eg: Dot Matrix printers and Line matrix printers are impact printers.

(ii) Non-Impact Printers:
These printers do not use striking mechanism for printing. They use electrostatic and laser technology. Quality and speed of these printers is better than Impact printers. Eg: Laser printers and Inkjet printers are hon-impact printers.

Question 32.
What is the classification of memory?
Answer:
The Memory Unit is of two kinds which are primary memory and secondary memory. The primary memory is used to temporarily store the programs and data when the instructions are ready to execute.Eg: RAM
The secondary memory is used to permanently store the data. Eg: Hard disk, CD-ROM.

Question 33.
What is boot sequence? (or) Write the process of Booting.
Answer:
An Operating System (OS) is a basic software that makes the computer to work. When a computer is switched on, there is no information in its RAM. At the same time, in ROM, the pre-written program called POST (Power on Self Test) will be executed first. This program checks if the devices like RAM, keyboard, etc., are connected properly and ready to operate. If these devices are ready, then the BIOS (Basic Input Output System) gets executed. This process is called Booting. Thereafter, a program called “Bootstrap Loader” transfers OS from hard disk into main memory. Now the OS gets
loaded (Windows/Linux, etc.,) and will get executed.
Booting process is of two types:
(i) Cold Booting
(ii) Warm Booting.

Question 34.
Write short notes on sixth generation computers.
Answer:
In the Sixth Generation, computers could be defined as the era of intelligent computers, based on Artificial Neural Networks. One of the most dramatic changes in the sixth generation will be the explosive growth of Wide Area Networking. Natural Language Processing (NLP) is a component of Artificial Intelligence (AI). It provides the ability to develop the computer program to understand human language.

Question 35.
Write the mechanism for mechanical mouse.
Answer:
(i) A small ball is kept inside and touches the pad through a hole at the bottom of the mouse.
(ii) When the mouse is moved, the ball rolls.
(iii) This movement of the ball is converted into signals and sent to the computer.

Question 36.
Write the function of keyboard.
Answer:
Keyboard (wired / wireless, virtual) is the most common input device used today. The individual keys for letters, numbers and special characters are collectively known as character keys. This keyboard layout is derived from the keyboard of original typewriter. The data and instructions are given as input to the computer by typing on the keyboard.

Apart from alphabet and numeric keys, it also has Function keys for performing different functions. There are different set of keys available in the keyboard such as character keys, modifier keys, system and GUI keys, enter and editing keys, function keys, navigation keys, numeric keypad and lock keys.

Question 37.
Write short notes on
(i) Optical character reader
(ii) Voice input system.
Answer:
(i) Optical Character Reader:
It is a device which detects characters printed or written on a paper with OCR, a user can scan a page from a book. The Computer will recognize the characters in the page as letters and punctuation marks and stores. The Scanned document can be edited using a word processor.

(ii) Voice Input System:
Microphone serves as a voice input device. It captures the voice data and send it to the Computer. Using the microphone along with speech recognition software can offer a completely new approach to input information into the Computer.

Question 38.
Expand the following:
(i) POST
(ii) BIOS
(iii) NLP.
Answer:
(i) POST: Power On Self Test.
(ii) BIOS: Basic Input Output System.
(iii) NLP: Natural Language Processing.

Question 39.
How the touch screen allows the user to interact with computer?
Answer:
A touch screen is a display device that allows the user to interact with a computer by using the finger. It can be quite useful as an alternative to a mouse or keyboard for navigating a Graphical User Interface (GUI).

Touch screens are used on a wide variety of devices such as computers, laptops, monitors, smart phones, tablets, cash registers and information kiosks. Some touch screens use a grid of infrared beams to sense the presence of a finger instead of utilizing touch-sensitive input.

Question 40.
What is the use of Fingerprint Scanner?
Answer:
Fingerprint Scanner is a fingerprint recognition device used for computer security, equipped with the fingerprint recognition feature that uses biometric technology. Fingerprint Reader / Scanner is a very safe and convenient device for security instead of using passwords, which is vulnerable to fraud and is hard to remember.

Question 41.
Write about the light pen.
Answer:
A light pen is a pointing device shaped like a pen and is connected to a monitor. The tip of the light pen contains a light-sensitive element which detects the light from the screen enabling the computer to identify the location of the pen on the screen. Light pens have the advantage of ‘drawing’ directly onto the screen, but this becomes hard to use, and is also not accurate.

Question 42.
What is hardware and software?
Answer:
Hardware is the physical component of a computer like motherboard, memory devices, monitor, keyboard etc. Software is the set of programs or instructions.

Question 43.
Give the use of speakers.
Answer:
Speakers produce voice output (audio). Using speaker along with speech synthesize software, the computer can provide voice output. This has become very common in places like airlines, schools, banks, railway stations, etc.

Question 44.
List a few commonly used Input devices and explain them briefly.
Answer:
The most commonly used Input devices are:
(i) Keyboard: For answer refer Page 18, Q.No. 8.
(ii) Mouse: For answer refer Page 17, Q.No. 1.
(iii) Scanner: For answer refer Page 15, Q.No. 8.
(iv) Barcode Readers: A Bar code is a pattern printed in lines of different thickness. The Bar code reader scans the information on the bar codes and transmits to the Computer for further processing. The system gives fast and error free entry of information into the computer.
(v) Digital camera: It captures images / videos directly in the digital form. It uses a CCD (Charge Coupled Device) electronic chip. When light falls on the chip through the lens, It converts light rays into digital format.

Question 45.
Write the commonly used output devices and explain them briefly.
Answer:
The most commonly used output devices are
(i) Monitor,
(ii) Printers.
(i) Monitor:
For answer refer Page 5,
Q.No. 8.

(ii)Printers:
Printers are used to print the information on papers. Printers are divided into two main categories.
Printers

TN State Board 11th Computer Science Important Questions Chapter 1 Introduction to Computers 1

(a) Impact Printers:
For answer refer Page 4, Q.No. 6.

(b) Non-Impact Printers:
These printers donot use striking mechanism for printing. They use electrostatic or laser technology. Quality and speed of these printers are better than Impact printers. Eg: Laser printers and Inkjet printers are non-impact printers.

Thermal Printers:
It is a digital printing process which produces a printed image by selectively heating coated thermochromic paper or thermal paper as it is commonly known, when the paper passes over the thermal print head. The coating turns black in the areas where it is heated, producing an image. Two colour direct thermal printers can print both black and an additional colour (often red) by applying heat at two different temperature.

Laser Printers:
Laser printers mostly work with similar technology used by photocopiers. It makes a laser beam scan back and forth across a drum inside the printer, building up a pattern. It can produce very good quality of graphic images. One of the chief characteristics of laser printer is their resolution – how many Dots per inch(DPI). The available resolution range around 1200 dpi. Approximately it can print 100 pages per minute(PPM).

Inkjet Printers: For answer refer Page 7, Q.No. 3 (I).

Question 46.
Explain the types of mouse.
Answer:

TN State Board 11th Computer Science Important Questions Chapter 1 Introduction to Computers 2

Question 47.
Explain the classification of computers.
Answer:
The computer systems can be classified on the following basis:
(i) On the basis of size.
(ii) On the basis of functionality.
(iii) On the basis of data handling.
Classification on the basis of size:
Super computers:
The super computer is a computers are the most high performing system. The actual performance of a super
computer is measured in FLOPS [Floating point Operations Per Second] instead of MIPS [Million Instruction Per Second]. All of the world’s fastest 500 supercomputers run Linux-based operating systems.

Super computers are used for intensive computation tasks in various fields, including weather forecasting, climate research, oil and gas exploration, molecular modeling and physical simulations. Eg: PARAM, Jaguar, roadrunner.

Main frame computers:
These are commonly called as big iron, they are usually used by big organisations for bulk data processing such as statistics, census data processing, transaction processing and are widely used as the servers. Eg: IBMZ series, system Z9 and system Z10 servers.

Minicomputer:
Computer that is smaller, less expensive and less powerful than mainframe or supercomputer, but more expensive and more powerful than a personal computer. Minicomputers are used for scientific and engineering computations, business transaction processing, file handling and database management. Eg: Person laptop, PC etc.

Micro computers:
A microcomputer is a computer with a central processing unit (CPU) as a microprocessor. Designed for individual use, a microcomputer is small than a mainframe or a minicomputer. It includes a microprocessor, memory and minimal I/O circuitry mounted on a single printed circuit board. Eg: Tablets, Smart watches.

Classification on the basis of functionality:
Servers:
Servers are nothing but dedicated computers which are set up to offer some services to the clients. Eg: Security server, database server.
Workstation:
Those are the computers designed to primarily to be used by single user at a time. They are the ones which we use for our day to day personal / commercial / work.

Information Appliances:
They are the portable devices which are designed to perform a limited set of tasks like basic calculations, playing multimedia, browsing internet etc. They are generally referred as the mobile devices.

Embedded computers:
They are the computing devices which are used in other machines to serve limited set of requirements.

Classification on the basis of data handling:

Analog computer:
An analog computer is a computer which is used to process analog data. Analog computers store data in a continuous form of physical quantities and perform calculations with the help of measures. Example of such data are pressure, temperature, voltage, speed and weight. Real-time operation and simultaneous computation is possible with the help of analog computers.

Digital computer:
A computer that performs calculations and logical operations with quantities represented as digits, usually in the binary number system of “0” and “1” computer capable of solving problems by processing information in discrete form.

Hybrid computer: A computer that processes both analog and digital data, Hybrid computer is a digital computer that accepts analog signals, converts them to digital and processes them in digital form.

Question 48.
Give the details of motherboard names, RAM capacity used in the years 1993, 1995, 2005, 2008, 2016.
Answer:
1993 – Intel develops PPGA for setting chipset to mother board. Plastic pin grid array was developed by intel in 1993. It is assisted in Integrated circuit packaging 4 MB RAM capacity used.

1995 – Intel releases new mother board ATX form factor. This motherboard including new dimensions and layout. Improving, space and interchange ability of parts, it solved many issues faced by system builders. 8 MB RAM capacity used.

2005 – Intel introduces balanced technology extended. Intel’s concept to redesign the ATX case was short lived mainly because compatible components where limited as well as it not being able to accept energy efficient components. 2 GB RAM is used.

2008 – TheT Mobile ITX, VIAS mobile – ITX is the world smallest complaint mother board
form factor. Just 60 MM by 60 MM. 4 GB RAM is used.

2016 – Intel 100 series motherboard has been superseded by the 200 series with the advent of the 7th generation Kaby Lake CPUs. 16 GB RAM is used.

Question 49.
Mention two new input and output devices that are not given in this chapter.
Answer:
Input devices:
(i) Joystick:
Joystick is also a pointing device, which is used to move the cursor position on a monitor screen. It is a stick having a spherical ball as its both lower and upper ends. The function of the joystick is similar to that of a mouse. It is mainly used in computer Aided Designing (CAD) and playing computer games.

(ii) Digitizer:
Digitizer is an input device which converts analog information into digital form. It can convert a signal from the television or camera into a series of numbers that could be stored in a computer. It is also known as graphics tablet. It is used for five works of drawing and image manipulation applications.

(iii) Optical Mark Reader (OMR):
OMR is a special type of optical scanner used to recognize the type of mark made by pen or pencil. It is specially used for checking the answer sheets of examinations having multiple choice questions.

(iv) MIDI keyboard:
MIDI keyboard is the most uses keyboard for composing the songs. Generally, the piano is used with a computer to compose the song with the use of USB or MIDI cable.

Output devices:
(i) Speech generating device:
SGD is an output device that assists speech impaired individuals to communicate. Speech – generating devices also find use with children who are suspected of having speech deficiencies.

(ii) Film recorder:
A film recorder is a graphical output device for transferring digital images to photographic film.

(iii) Computer Output Microfilm (COM):
Computer Output Microfilm is a system that converts stored data directly to microfilm. A high speed recorder transfers machine readable digital data on to human-readable microfilm using laser technology and a processor, which develops the microfilm after it is exposed to the light source.

Question 50.
What is a computer?
Answer:
“A Computer is an electronic device that takes raw data (unprocessed) as an input from the user and processes it under the control of a set of instructions (called program), produces a result (output) and saves ¡t for future use.”

Question 51.
Distinguish between data and information.
Answer:

Data	Information
An unprocessed collection of raw facts, suitable for communication, interpretation or processing.	A collection of facts from which conclusions may be drawn.
Data is individual unit and doesn’t carry any meaning.	Information is the product and group of data collectively carry a logical meaning.
Eg: 134, 16, ‘Kavitha’, ‘C’ are data. This will not give any meaningful message.	Eg: Kavitha is 16 years old.

Question 52.
What are the components of a CPU?
Answer:
Control Unit, Arithmetic and Logic Unit (ALU) and Memory Unit are the three components of a CPU.

Question 53.
What is the function of an ALU?
Answer:
In CPU, ALU performs various computing functions on data. The ALU performs arithmetic operations such as addition, subtraction, multiplication, division and logical operations. Such as AND, OR, NOT. The result of an operation is stored in internal memory of CPU. The logical operations of ALU promote the decision-making ability of a computer.

Question 54.
Write the functions of control unit.
Answer:
Controls the flow of data between the CPU, memory and I/O devices. Controls the entire operation of a computer.

Question 55.
What is the function of memory?
Answer:
The basic function of computer memory is essential to store data. The memory unit is of two types:- Primary memory and Secondary memory. The Primary Memory (main memory) is volatile, i.e., the content is lost when the power supply is switched off.
Eg: the Random Access Memory (RAM). The Secondary memory is non-volatile. The content is available even after the power supply is switched off.
Eg: Hard disk, CD-ROM and DVD ROM.

Question 56.
Differentiate Input and output unit.
Answer:

Input unit	Output unit
Input unit is used to feed data to the computer, initially which can be stored in the memory unit for further processing.	An output unit is any hardware component that conveys information in users understandable form.
Eg: Keyboard, Mouse, etc.	Eg: Printer, Plotter etc.

Question 57.
Distinguish Primary and Secondary memory.
Answer:

Primary memory	Secondary memory
It is used to temporarily store the programs and data when the instructions are ready to execute.	It is used to store the data permanently.
It is a volatile memory i.e., the content is Lost when the power supply is switched off.	It is a non volatile memory i.e., the content is available even after the power supply is switched off.
It is also known as main memory.	It is also known as auxiliary memory.
Eg: Random Access Memory (RAM)	Eg: Hard disk, CD ROM and DVD ROM.

Question 58.
What are the characteristics of a computer?
Answer:
The general characteristics of computers are speed, memory capacity, accuracy, diligence, representativeness, reliability, endurance and versatility.

Question 59.
Write the applications of computer.
Answer:
The applications of computers are business, education, marketing,banking, insurance, communication, health care, military, engineering design, entertainments, advertisement.

Question 60.
What is an input device? Give two examples.
Answer:
The input device is the component through which data and instructions are provided to the computer. Eg: Keyboard and mouse.

Question 61.
Name any three output devices.
Answer:
The output device is the component which delivers the data and informtion proceed by the CPU. Eg: Monitor, printers, speaker.

Question 62.
Differentiate optical and Laser mouse.
Answer:

Optical Mouse	Laser Mouse
It uses LED lights to track the movements.	It uses laser to track the movements.
It has three buttons.	It has as many as 12 buttons and can be programmed by user.
It is less sensitive towards surface.	It is highly sensitive and able to work on any hard surface.

Question 63.
Write short note on impact printer.
Answer:
Impact printers print with striking of hammers or pins on ribbon. They can print on multi-part (using carbon papers) by using mechanical pressure. Eg: Dot Matrix printers and Line matrix printers.

TN State Board 11th Computer Science Important Questions Chapter 1 Introduction to Computers 3

A Dot matrix printer prints using a fixed number of pins or wires. Each dot is produced by a tiny metal rod, also called a “wire” or “pin”, which works by the power of a tiny electromagnet or solenoid, either directly or through a set of small levers. It generally prints one line of text at a time. The printing speed of these printers varies from 30 to 1550 CPS (Character Per Second).

Line matrix printers use a fixed print head for printing. It prints a page-wide line of dots, but it builds up a line of text by printing lines of dots. They are capable of printing much more than 1000 Lines Per Minute, resulting in thousands of pages per hour. These printers also uses mechanical pressure to print on multi-part (using carbon papers).

Question 64.
Write the characteristics of sixth generation.
Answer:
(i) Parallel and Distributed computing.
(ii) Computers have become smarter, faster and smaller.
(iii) Development of robotics.
(iv) Natural Language Processing.
(v) Development of Voice Recognition Software.

Question 65.
Write the significant features of monitor.
Answer:
Monitor is the most commonly used output device to display the information. It looks like a TV. Pictures on a monitor are formed with picture elements called Pixels. Monitors may either be Monochrome which display text or images in Black and White or can be color, which display results in multiple colors.

There are many types of monitors available such as CRT (Cathode Ray Tube), LCD (Liquid Crystal Display) and LED (Light Emitting Diodes). The monitor works with the VGA (Video Graphics Array) card. The video graphics card helps the keyboard to communicate with the screen. It acts as an interface between the computer and display monitor. Usually the recent motherboards incorporate built-in video card.

Question 66.
Explain the basic components of a computer with a neat diagram.
Answer:
The computer is the combination of hardware and software. Hardware is the physical
component of a computer like motherboard, memory devices, monitor, keyboard etc., Software is the set of programs or instructions. Both hardware and software together make the computer system function.

TN State Board 11th Computer Science Important Questions Chapter 1 Introduction to Computers 4

Input unit:
It is used to feed any form of data to the computer, which can be stored in the memory unit for further processing. Eg: Keyboard, mouse etc.

Central processing unit (CPU):
It is the major component which interprets and executes software instructions. It also control the operation of all other components such as memory, input and output units. It accepts binary data as input, process the data according to the instructions and provide the result as output. The CPU has three components which are Control unit, Arithmetic and logic unit (ALU) and Internal Memory.

(i) Arithmetic and Logic Unit:
In CPU, ALU performs various computing functions data. The ALU performs arithmetic operations such as addition, subtraction, multiplication, division and logical operations. The result of an operation is stored in internal memory of CPU. The logical operations of ALU promote the decision-making ability of a computer.

(ii) Control Unit:
It controls the flow of data between the CPU, memory and I/O devices. It also controls the entire operation of a computer. memory (or) main memory, often referred to simply as memory is the only one directly accessible to the CPU.

Output Unit:
Any hardware component that conveys information to users in an understandable form. Eg: Monitor, Printer etc.

Memory Unit:
The Memory Unit is of two types:- Primary memory and Secondary memory. The primary memory is used to temporarily store the programs and data when the instructions are ready to execute. The secondary memory is used to store the data permanently.

(i) The Primary Memory (main memory) is volatile, the content is lost when the power supply is switched off. Random Access Memory (RAM).
(ii) The Secondary memory is non-volatile, the content is available even after the power supply is switched off. Eg: Hard disk, CD-ROM and DVD ROM.

Question 67.
Discuss the various generations of computers.
Answer:

TN State Board 11th Computer Science Important Questions Chapter 1 Introduction to Computers 5

TN State Board 11th Computer Science Important Questions Chapter 1 Introduction to Computers 6

Question 68.
Explain the following:
(i) Inkjet Printer
(ii) Multimedia projector
(iii) Bar code / QR code Reader.
Answer:
(i) Inkjet Printer:
It uses colour cartridges which combine Magenta, Yellow and Cyan inks to create color tones. A black cartridge is also used for monochrome output. They work by spraying ionised ink at a sheet of paper. The speed of it generally range from 1-20 PPM (Page Per Minute).

They use the technology of firing ink by heating it so that it explodes towards the paper in bubbles or by using piezoelectricity in which tiny electric currents controlled by electronic circuits are used inside the printer to spread ink in jet speed. An Inkjet printer can spread millions of dots of ink at the’ paper every single second.

(ii) Multimedia projector:
They are used to produce computer output on a big screen. These are used to display presentations in meeting halls or in classrooms.

(iii) Bar code / QR code Reader:
A Bar code is a pattern printed in lines of different thickness. Scans the information on the bar codes and transmits to the computer for further processing. The system gives fast and error free entry of information into the computer.

(iv) QR (Quick response) Code:
The QR code is the two dimension bar code which can be read by a camera and processed to interpret the image.

Choose the correct answer:

Question 1.
_______ is the father of computer.
(a) John Napier
(b) William Oughtred
(c) Blaise Pascal
(d) Charles Babbage
Answer:
(d) Charles Babbage

Question 2.
The expansion of ALU is:
(a) Arithmetic Logic Unit
(b) Arithmetic Long Unit
(c) Arithmetic Law Unit
(d) Arithmetic Logo Unit
Answer:
(a) Arithmetic Logic Unit

Question 3.
The first generation was in the year:
(a) 1942-1955
(b) 1955-1964
(c) 1964-1975
(d) 1975 – present
Answer:
(a) 1942-1955

Question 4.
The first generation computers used:
(a) assembly language
(b) machine language
(c) high level language
(d) word processor language
Answer:
(b) machine language

Question 5.
__________ used in second generation computers.
(a) Punched cards
(b) Plotter
(c) Printers
(d) Keyboard
Answer:
(a) Punched cards

Question 6.
Second generation computers used:
(a) vacuum tube
(b) transistor
(c) integrated circuit
(d) micro processor
Answer:
(b) transistor

Question 7.
Batch processing and multi programming operating system were used in:
(a) first generation
(b) second generation
(c) third generation
(d) fourth generation
Answer:
(b) second generation

Question 8.
The second generation was in the year:
(a) 1942-1955
(b) 1955-1964
(c) 1964-1975
(d) 1975-1980
Answer:
(b) 1955-1964

Question 9.
Third generation computers used:
(a) vacuum tube
(b) transistor
(c) integrated circuit
(d) microprocessor
Answer:
(c) integrated circuit

Question 10.
The third generation was in the year:
(a) 1955 – 1964
(b) 1964 – 1975
(c) 1975 – 1980
(d) 1942 – 1955
Answer:
(b) 1964 – 1975

Question 11.
High level language appeared in:
(a) first generation
(b) second generation
(c) third generation
(d) fourth generation
Answer:
(c) third generation

Question 12.
Fourth generation computers used:
(a) vacuum tube
(b) transistor
(c) integrated circuit
(d) microprocessor
Answer:
(d) microprocessor

Question 13.
Portable computers were introduced in _______ generation.
(a) first
(b) second
(c) third
(d) fourth
Answer:
(d) fourth

Question 14.
Fourth generation computers was in the year:
(a) 1942-1955
(b) 1955-1964
(c) 1964-1975
(d) 1975-1980
Answer:
(d) 1975-1980

Question 15.
Microcomputer series such as IBM and APPLE developed in __________ generation.
(a) first
(b) second
(c) third
(d) fourth
Answer:
(d) fourth

Question 16.
Fifth generation was in the year:
(a) 1980-1990
(b) 1955-1964
(c) 1980 – present
(d) 1942-1955
Answer:
(c) 1980 – present

Question 17.
Computers can recognize images and graphs in:
(a) first generation
(b) second generation
(c) fourth generation
(d) fifth generation
Answer:
(d) fifth generation

Question 18.
Introduction of Artificial intelligence is in generation.
(a) sixth
(b) third
(c) fourth
(d) fifth
Answer:
(d) fifth

Question 19.
__________ is in the sixth generation.
(a) Introduction of portable computers
(b) Introduction of artificial intelligence
(c) Development of robotics
(d) Introduction of word processors
Answer:
(c) Development of robotics

Question 20.
Sixth generation computers are:
(a) batch processing
(b) parallel processing
(c) natural language processing
(d) natural networks
Answer:
(c) natural language processing

Question 21.
Voice Recognition is in the generation.
(a) sixth
(b) fourth
(c) fifth
(d) third
Answer:
(a) sixth

Question 22.
____________ is the ability of a computer program to understand human language.
(a) NLP
(b) CPU
(c) ANN
(d) AI
Answer:
(a) NLP

Question 23.
______ is a component of artificial intelligence.
(a) CPU
(b) ANN
(c) NLP
(d) ALU
Answer:
(c) NLP

Question 24.
_______ deals with the design, construction, operation and use of robots.
(a) NLP
(b) Robotics
(c) AI
(d) ANN
Answer:
(b) Robotics

Question 25.
___________ is the study and application of extremely small things.
(a) Nanotechnology
(b) ANN
(c) Natural language processing
(d) Bio Engineering
Answer:
(a) Nanotechnology

Question 26.
________ involves the ability to see and to control individual atoms and molecules.
(a) Robotics
(b) Artificial neural networks
(c) Nanotechnology
(d) NLP
Answer:
(c) Nanotechnology

Question 27.
_________ applies engineering principles of design and analysis to biological systems and biomedical technologies.
(a) Nanotechnology
(b) Robotics
(c) Bio-engineering
(d) NLP
Answer:
(c) Bio-engineering.

Question 28.
__________ is the term used for rawfacts and figures.
(a) Data
(b) Information
(c) Mother board
(d) Data processing
Answer:
(a) Data

Question 29.
Data represented in useful and meaningful form is:
(a) data processing
(b) information
(c) data
(d) information set
Answer:
(b) information

Question 30.
The conversion of data into information is called:
(a) computer
(b) information
(c) data processing
(d) software
Answer:
(c) data processing

Question 31.
The computer is the combination of:
(a) hardware and software
(b) mother board and memory devices
(c) monitor and keyboard
(d) monitor and CPU
Answer:
(a) hardware and software

Question 32.
_________ is the physical components of a computer.
(a) Software
(b) Hardware
(c) Mouse
(d) CPU
Answer:
(b) Hardware

Question 33.
________ is the set of programs or instructions.
(a) Hardware
(b) Software
(c) Input – Process – Output
(d) Data
Answer:
(b) Software

Question 34.
Every task given to a computer follows an:
(a) instruction
(b) input – process – output cycle
(c) data
(d) process cycle
Answer:
(b) input – process – output cycle

Question 35.
_________ holds the data and instructions during the processing.
(a) Input unit
(b) Memory unit
(c) Output unit
(d) Storage unit
Answer:
(b) Memory unit

Question 36.
_________ is the component through which data and instructions are provided to the computer.
(a) Input device
(b) Output device
(c) Memory unit
(d) Storage device
Answer:
(a) Input device

Question 37.
_______ is the heart of the computer.
(a) Memory
(b) Software
(c) Storage devices
(d) CPU
Answer:
(d) CPU

Question 38.
The is the component which delivers the data and information processed by the CPU.
(a) memory storage device
(b) input device
(c) CPU
(d) output device
Answer:
(d) output device

Question 39.
The expansion of CPU is:
(a) Central Processing Unit
(b) Central Prefix Unit
(c) Central Power Unit
(d) Central Printer Unit
Answer:
(a) Central Processing Unit

Question 40.
__________ is the logical machine which interprets and executes software instructions.
(a) CPU
(b) Mother Board
(c) Input Device
(d) Storage Device
Answer:
(a) CPU

Question 41.
The CPU has units.
(a) four
(b) five
(c) two
(d) three
Answer:
(d) three

Question 42.
The performs arithmetic operations.
(a) ALU
(b) CPU
(c) control unit
(d) memory unit
Answer:
(a) ALU

Question 43.
The operations of ALU promote the decision making ability of a computer.
(a) arithmetic
(b) logical
(c) comparison
(d) text
Answer:
(b) logical

Question 44.
The _______ unit controls the flow of data between the CPU, memory and I/O devices.
(a) memory
(b) ALU
(c) CPU
(d) control
Answer:
(d) control

Question 45.
The memory unit is of kinds.
(a) three
(b) four
(c) five
(d) two
Answer:
(d) two

Question 46.
________ memory is used to temporarily store the programs and data.
(a) Primary
(b) Secondary
(c) PROM
(d) EPROM
Answer:
(a) Primary

Question 47.
___________ is the most common input device used today.
(a) Keyboard
(b) Mouse
(c) Scanner
(d) Light Pen
Answer:
(a) Keyboard

Question 48.
________ is a pointing device used to control the movement of the cursor on the display screen.
(a) Keyboard
(b) Scanner
(c) Trackball
(d) Mouse
Answer:
(d) Mouse

Question 49.
________ are used to enter information directly into the computer’s memory.
(a) Mouse
(b) Keyboard
(c) Scanner
(d) Trackball
Answer:
(c) Scanner

Question 50.
__________ used for computer security equipped with the fingerprint recognition.
(a) Fingerprint scanner
(b) Retinal scanner
(c) Optical character reader
(d) Touch screen
Answer:
(a) Fingerprint scanner

Question 51.
___________ uses the unique patterns on a person’s retinal blood vessels.
(a) Scanners
(b) Finger print scanner
(c) Barcode reader
(d) Retinal scanner
Answer:
(d) Retinal scanner

Question 52.
______ is an input device which is used to draw lines or figures on a computer screen.
(a) OCR
(b) Light pen
(c) Mouse
(d) Keyboard
Answer:
(b) Light pen

Question 53.
__________ is a device which detects alpha numeric characters printed or written on a paper.
(a) Optical Character Reader
(b) Light Pen
(c) Scanner
(d) Bar code Reader
Answer:
(a) Optical Character Reader

Question 54.
_______ reads bar codes and converts them into electric pulses to be processed by a computer.
(a) Scanner
(b) Track Ball
(c) Mouse
(d) Bar Code Reader
Answer:
(d) Bar Code Reader

Question 55.
A ________ converts human speech into electrical signals.
(a) digital camera
(b) touch screen
(c) microphone
(d) keyboard
Answer:
(c) microphone

Question 56.
_________ captures images and videos directly into the digital form.
(a) Microphone
(b) Light pen
(c) Touch screen
(d) Digital camera
Answer:
(d) Digital camera

Question 57.
__________ is a display device that allows the uses to interact with a computer by using the finger.
(a) Microphone
(b) Light pen
(c) Touch screen
(d) Digital camera
Answer:
(c) Touch screen

Question 58.
__________ is a device for signalling by hand.
(a) Keyer
(b) Microphone
(c) Touchscreen
(d) Scanner
Answer:
(a) Keyer

Question 59.
_________ is the most commonly used output device to display the information.
(a) Printer
(b) Monitor
(c) Plotter
(d) Keyer
Answer:
(b) Monitor

Question 60.
______ is used to produce graphical output on papers.
(a) Printers
(b) Plotters
(c) Monitor
(d) Scanners
Answer:
(b) Plotters

Question 61.
_________ are used to print the information on papers.
(a) Plotters
(b) Monitor
(c) Printers
(d) Scanners
Answer:
(c) Printers

Question 62.
Printers are divided into _______ main categories.
(a) three
(b) two
(c) four
(d) five
Answer:
(b) two

Question 63.
The printing speed of serial dot matrix printers varies from:
(a) 50 to 1000 cps
(b) 100 to 1000 cps
(c) 40 to 1550 cps
(d) 30 to 1550 cps
Answer:
(d) 30 to 1550 cps

Question 64.
Line printers are capable of printing _______ lines per minute.
(a) more .than 500
(b) more than 800
(c) more than 100
(d) more than 1000
Answer:
(d) more than 1000

Question 65.
_________ produces voice output.
(a) Printer
(b) Projector
(c) Speakers
(d) Plotters
Answer:
(c) Speakers

Question 66.
________ is used to produce computer output
on a big screen.
(a) Monitor
(b) Multimedia projector
(c) Speakers
(d) Plotters
Answer:
(b) Multimedia projector

Question 67.
Booting process is of ________ types.
(a) two
(b) three
(c) four
(d) five
Answer:
(a) two

Question 68.
Cold Booting is also called as:
(a) hard booting
(b) soft booting
(c) rough booting
(d) fast booting
Answer:
(a) hard booting

Question 69.
___________ transfers from hard disk into main memory.
(a) Assembler
(b) Complier
(c) Bootstrap loader
(d) Loader
Answer:
(c) Bootstrap loader

Question 70.
When was Analytical Engine invented?
(a) 1835
(b) 1836
(c) 1837
(d) 1838
Answer:
(c) 1837

Question 71.
Who invented the Analytical Engine?
(a) John Napier
(b) William Oughtred
(c) Charles Babbage
(d) Blaise Pascal
Answer:
(c) Charles Babbage

Question 72.
Which is the first calculating machine?
(a) Abacus
(b) Analytical Engine
(c) Napier bones
(d) ENLAC
Answer:
(a) Abacus

Question 73.
Which of the following is first digital computer?
(a) ENIAC
(b) ED VAC
(c) UNIVAC – 1
(d) UNIVAC -1108
Answer:
(a) ENIAC

Question 74.
Who invented ENIAC?
(a) J. Presper Eckert
(b) John Mauchly
(c) Both (a) and (b)
(d) John Napier
Answer:
(c) Both (a) and (b)

Question 75.
Which one of the following is known as subfield of AI?
(a) Deep Learning Neural Networks
(b) Optical Character Recognition
(c) Optical Grapheme Recognition
(d) Artificial Natural Network
Answer:
(a) Deep Learning Neural Networks

Question 76.
How many Indus scripts are available in the Indus valley civilization artifact system?
(a) 414
(b) 415
(c) 416
(d) 417
Answer:
(d) 417

Question 77.
What is called a set of Instructions given to the computer?
(a) Hardware
(b) Program
(c) Output
(d) Input
Answer:
(b) Program

Question 78.
(a) Richard Lyon
(b) Steve Krish
(c) Telefunken
(d) John Mauchly
Answer:
(c) Telefunken

Question 79.
Which of the following is a non-volatile memory?
(a) ROM
(b) RAM
(c) CDROM
(d) DVD
Answer:
(c) CDROM

Question 80.
In which type of mouse a small ball is kept inside and touches the pad?
(a) Mechanical mouse
(b) Optical mouse
(c) Laser mouse
(d) Air mouse
Answer:
(a) Mechanical mouse

Question 81.
How many buttons are there in an optical mouse?
(a) 1
(b) 2
(c) 3
(d) 4
Answer:
(c) 3

Question 82.
Who invented and developed the mouse?
(a) Douglas Engelbart
(b) William Oughtred
(c) Douglas Einestein
(d) John Napier
Answer:
(a) Douglas Engelbart

Question 83.
Which one of the device works like a xerox machine?
(a) OCR
(b) Barcode
(c) Scanner
(d) QR code Reader
Answer:
(c) Scanner

Question 84.
Which one of the device uses biometric technology?
(a) Fingerprint scanner
(b) Track ball
(c) Retinal scanner
(d) Both (a) and (c)
Answer:
(d) Both (a) and (c)

Question 85.
Which device has upside-down design of the mouse?
(a) Mouse
(b) Scanner
(c) Track ball
(d) Light pen
Answer:
(c) Track ball

Question 86.
Which device is a pointing device shaped like a pen?
(a) Track ball
(b) Light pen
(c) Scanner
(d) OCR
Answer:
(b) Light pen

Question 87.
Which device is used for fast and error free entry of information into the computer?
(a) Bar code
(b) OCR
(c) Scanner
(d) Camera
Answer:
(a) Bar code

Question 88.
Which system can be read by a camera and processed to interpret the image?
(a) QR code
(b) OCR
(c) Scanner
(d) Track ball
Answer:
(a) QR code

Question 89.
Which system serves as voice input device?
(a) QR code
(b) OCR
(c) Bar code
(d) Microphone
Answer:
(d) Microphone

Question 90.
Which device captures images or videos directly in the digital form?
(a) Bar code
(b) Digital camera
(c) OCR
(d) Scanner
Answer:
(b) Digital camera

Question 91.
Which device can be used as an alternate to input for navigating a GUI?
(a) Bar code
(b) Digital camera
(c) OCR
(d) Touch screen
Answer:
(d) Touch screen

Question 92.
Which input device has a large number of switches?
(a) OCR
(b) Camera
(c) Keyer
(d) Touch screen
Answer:
(c) Keyer

Question 93.
Which card act as a interface between the computer and display monitor?
(a) Video graphics card
(b) CRT
(c) LCD
(d) Keyer
Answer:
(a) Video graphics card

Question 94.
Which is the first computer monitor was part of the xerox?
(a) Alto computer
(b) Micro computer
(c) Mini computer
(d) Super computer
Answer:
(a) Alto computer

Question 95.
Which printer prints using a fixed number of pins or wires?
(a) Plotter
(b) Dot matrix printer
(c) Line printer
(d) Laser printer
Answer:
(b) Dot matrix printer

Question 96.
Which printer prints one line of text at a time?
(a) Dot matrix printer
(b) Plotter
(c) Line printer
(d) Laser printer
Answer:
(a) Dot matrix printer

Question 97.
What type of printers uses a fixed print head for printing page-wide line of dots?
(a) Line Matrix Printer
(b) Plotter
(c) Laser Printer
(d) Inkjet Printer
Answer:
(a) Line Matrix Printer

Question 98.
What type of printers work with similar technology used by photocopiers?
(a) Line Printer
(b) Laser Printer
(c) Dot Matrix Printer
(d) Plotter
Answer:
(b) Laser Printer

Question 99.
How many Dot Per Inch (DPI) resolution available in Laser Printer?
(a) 1000 dpi
(b) 1100 dpi
(c) 1200 dpi
(d) 1300 dpi
Answer:
(c) 1200 dpi

Question 100.
Which printer works by spraying ionised ink at a sheet of paper?
(a) Line printer
(b) Laser printer
(c) Inkjet printer
(d) Dot matrix printer
Answer:
(c) Inkjet printer

Question 101.
What is the speed of Inkjet printer in Page Per Minute (PPM)?
(a) 1 – 10 PPM
(b) 1 – 12 PPM
(c) 1 15 PPM
(d) 1 – 20 PPM
Answer:
(d) 1 – 20 PPM

Question 102.
Which printer use the technology of firing ink by heating?
(a) Inkjet printer
(b) Line printer
(c) Laser printer
(d) Dot matrix printer
Answer:
(a) Inkjet printer

Question 103.
Which device can provide voice output and using speech synthesize software?
(a) Laser printer
(b) Speakers
(c) Monitor
(d) Keyer
Answer:
(b) Speakers

Question 104.
What is the basic software that makes the computer to work?
(a) Operating system
(b) Application software
(c) Hardware
(d) Assembly language
Answer:
(a) Operating system

Question 105.
The computer devices connected properly and ready to the BIOS gets executed. This process is called:
(a) compiling
(b) booting
(c) starting
(d) shutdown
Answer:
(b) booting

Question 106.
Pre-written program in the ROM memory is called:
(a) POST
(b) BIOS
(c) OS
(d) Compiler
Answer:
(a) POST

Question 107.
Expand BIOS:
(a) Based Input Output System
(b) Basic Input Output System
(c) Before Input Output System
(d) Behind Input Output System
Answer:
(b) Basic Input Output System

Question 108.
When the system starts from initial state that is switched on, it is called:
(a) Booting
(b) Cold booting
(c) Warm booting
(d) Boot strap
Answer:
(b) Cold booting

Question 109.
Who invented the different versions of optical mouse?
(a) Richard Lyon
(b) Steve Krish
(c) Both (a) and (b)
(d) John Maunchly
Answer:
(c) Both (a) and (b)

Question 110.
The warm booting also known as:
(a) cold booting
(b) soft booting
(c) compiling
(d) boot strap
Answer:
(b) soft booting

Question 111.
Mechanical mouse was introduced in the year:
(a) 02/10/1968
(b) 02/10/1978
(c) 10/02/1998
(d) 10/02/1968
Answer:
(a) 02/10/1968

Question 112.
Which company introduced the mechanical mouse?
(a) German
(b) American
(c) Indian
(d) Britain
Answer:
(a) German

Question 113.
Which year optical mouse was introduced?
(a) 1998
(b) 1988
(c) 1996
(d) 1976
Answer:
(b) 1988

Question 114.
Match the following:

(a) Pointing device	(i) Barcode Reader
(b) Error free entry	(ii) Video graphics card
(c) Voice input device	(iii) Light pen
(d) Interface	(iv) Microphone

(a) (ii), (iii), (iv), (i)
(b) (iii), (iv), (i), (ii)
(c) (iii), (i), (iv), (ii)
(d) (i), (ii), (iii), (iv)
Answer:
(c) (iii), (i), (iv), (ii)

Question 115.
Match the following:

(i) First Generation	(a) Integrated circuits
(ii) Second Generation	(b) Vacuum tubes
(iii) Third Genenration	(c) Micro processor
(iv) Fourth Generation	(d) Transistors

(a) (i) – (c); (ii) – (d); (iii) – (a); (iv) – (b)
(b) (i) – (b); (ii) – (c); (iii) – (d); (iv) – (a)
(c) (i) – (b); (ii) – (d); (iii) – (a); (iv) – (c)
(d) (i) – (d); (ii) – (a); (iii) – (b); (iv) – (c)
Answer:
(c) (i) – (b); (ii) – (d); (iii) – (a); (iv) – (c)

Question 116.
Match the following:

(i) Analytical Engine	(a) Richard Lyon and Steve Krish
(ii) ENIAC	(b) Charles Babbage
(iii) Mechanical Mouse	(c) J.Presper Eckert and John Mauchly
(iv) Optical Mouse	(d) Telefunken

(a) (i) – (d); (ii) – (b); (iii) – (a); (iv) – (c)
(b) (i) – (b); (ii) – (c); (iii) – (d); (iv) – (a)
(c) (i) – (a); (ii) – (c); (iii) – (b); (iv) – (d)
(d) (i) – (b); (ii) – (d); (iii) – (c); (iv) – (a)
Answer:
(b) (i) – (b); (ii) – (c); (iii) – (d); (iv) – (a)

Question 117.
Choose the odd man out:
(a) Plotter
(b) Digital camera
(c) Track Ball
(d) Light Pen
Answer:
(a) Plotter

Question 118.
Choose the odd man out:
(a) Laser printer
(b) Inkjet printer
(c) Thermal printer
(d) Dot matrix printer
Answer:
(d) Dot matrix printer

Question 119.
Choose the incorrect pair.

Column – I	Column – II
(a) Keyboard	Most common input device
(b) Bar code Reader	A barcode is a pattern printed in lines of different thickness.
(c) Light Pen	Pointing device
(d) Retinal scanner	Similar to the upside – down design of the mouse.

Answer:
(d)

Question 120.
Choose the correct pair.

Column – I	Column – II
(a) First Generation	EDVAC
(b) Second Generation	UNIVAC 1
(c) Third Generation	IBM 1620
(d) Fourth Generation	Honeywell 6000 series

(a) Both A and R are true and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Answer:
(a) Both A and R are true and R is the correct explanation for A.

Question 121.
Assertion (A):
In the Sixth Generation, computers could be defined as the era of intelligent computers, based on Artificial Neural Networks.
Reason (R):
It provides the ability to develop the computer program to understand human language.
(a) Both A and R are true and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Answer:
(a) Both A and R are true and R is the correct explanation for A.

Question 122.
Assertion (A):
The term ‘Computer’ is derived from the word ‘Datum’ which means to calculate.
Reason (R):
The person who performs calculation is called as computer.
(a) Both A and R are true and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Answer:
(d) A is false, but R is true.

Question 123.
Assertion (A):
A touch screen is a display device that allows the user to interact with a computer by using the finger.
Reason (R):
It captures images/videos directly in the digital form.
(a) Both A and R are true and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Answer:
(b) Both A and R are true, but R is not the correct explanation for A.

Question 124.
First generation computers used:
(a) vacuum tubes
(b) transistors
(c) integrated circuits
(d) microprocessors
Answer:
(a) vacuum tubes

Question 125.
Name the volatile memory:
(a) ROM
(b) PROM
(c) RAM
(d) EPROM
Answer:
(c) RAM

Question 126.
Identify the output device:
(a) keyboard
(b) memory
(c) monitor
(d) mouse
Answer:
(c) monitor

Question 127.
Identify the input device:
(a) printer
(b) mouse
(c) plotter
(d) projector
Answer:
(b) mouse

Question 128.
_____ output device is used for printing building plan, flex board, etc.
(a) Thermal printer
(b) Plotter
(c) Dot matrix
(d) Inkjet printer
Answer:
(b) Plotter

Question 129.
Which one of the following is used to in ATM machines:
(a) touch screen
(b) speaker
(c) monitor
(d) printer
Answer:
(a) touch screen

Question 130.
When a system restarts which type of booting is used?
(a) Warm booting
(b) Cold booting
(c) Touch boot
(d) Real boot
Answer:
(a) Warm booting

Question 131.
Expand POST:
(a) Post on self Test
(b) Power on Software Test
(c) Power on Self Test
(d) Power on Self Text
Answer:
(c) Power on Self Test

Question 132.
Which one of the following is the main memory?
(a) ROM
(b) RAM
(c) Flash drive
(d) Hard disk
Answer:
(b) RAM

Question 133.
Which generation of computer used IC’s?
(a) First
(b) Second
(c) Third
(d) Fourth
Answer:
(c) Third

TN Board 11th Computer Science Important Questions

TN Board 11th Computer Science Important Questions and Answers

October 18, 2021

TN 11th Computer Science Important Questions State Board English Medium 2021-2022.

TN State Board 11th Computer Science Important Questions and Answers

TN Board 12th Computer Science Important Questions Chapter 10 Python Classes and Objects

October 18, 2021

TN State Board 12th Computer Science Important Questions Chapter 10 Python Classes and Objects

Question 1.
What is a public variable in python?
Answer:

The variables which are defined inside the class is public by default.
These variables can be accessed anywhere is the program using dot operator.

Question 2.
What is private variable in python?
Answer:
A variable prefixed with double underscore becomes in nature. These variables can be accessed only within the class.

Question 3.
Explain class methods using python.
Answer:

Python class function or method is very similar to ordinary function with a small difference that, the class method must have the first argument names as self.
No need to pass a value for this argument when we call the method.
Python provides its value automatically. Even if a method takes no arguments.

Question 4.
Write a program to check if the given number j is odd or even using class.
Answer:
class Odd Even:
even = 0 #class varaiable
def check(self,.num):
if num%2==0:
print(num,“ is Even number”)
else.
print(num,“ is Odd number”)
n=Odd_Even()
x = int(input(“Enter a value: ”))
n.check(x)

Question 5.
Write a program, to calculate area and circumference of a circle.
Answer:
class Circle:
pi=3.14
def_init_(self,radius):
self.radius=radius
def area(self):
return Circle.pi*(self.radius**2)
def circumference(self):
return 2*Circle.pi*self.radius
r = int(input(“Enter Radius: ”))
C = Circle(r)
print(“The Area =”,C.area( )) ,
print(“The Circumference =”,
C.circumference( ))

Question 6.
What is class?
Answer:

In python, a class is defined by using the keyword class.
Every class has unique name followed by a colon (:).
Eg: class student:

Question 7.
What is instantiation?
Answer:
When a class is created, next we should create an object or instance of that class. The process of creating object is called as class instantiation.

Question 8.
What is the output of the following program?
Answer:
class Sample:
_num=10
def disp(self):
print(self._num)
S=Sample( )
S.disp( )
print(S._num)
Output:
10
10

Question 9.
How will you create constructor in Python?
Answer:

In python, there is special function called ‘init’ which act as a constructor.
It must begin and end with double underscore.
It is executed automatically when the object is created.

Question 10.
What is the purpose of Destructor?
Answer:

Destructor is just opposite to constructor.
It is also a special method gets executed automatically when an object exit from the scope.
In python, _del_( ) method is used as destructor.

Question 11.
What are class members? How do you define it?
Answer:
(i) Any class member that is class variable or method (function) can be accessed by using object with a dot (.) operator.
(ii) Class variable and methods are together known as member of the class. The class members should be accessed. Though objects or instance of class.
The syntax is
object_name.class_member
Eg: stud name.Nam
In the above example, the name of the class is stud_name. Nam is called variable as class variable or member variable of the class.

Question 12.
Write a class with two private class variables and print the sum using a method.
Answer:
A variable prefixed with double underscore becomes private in nature. These variables can be accessed only within the class.
Eg:
Class student:
def_init_(self m, m1, m2):
self, m1 = m1
self._m2 = m2
In this example, there are two private class variables ml and m2 are declared, ml and m2 are added and display the sum values.
defdisplsy (self):
sum = student.ml+student.m2
print (“sum=”, self.sum)

Question 13.
Find the error in the following program to get the given output?
Answer:
class Fruits:
def_init_(self, fl, f2):
self.f1=f1
self.f2=f2
def display(self):
print(“Fruit 1 = %s, Fruit 2 = %s” %(self.fl, self.f2))
F = Fruits (‘Apple’, ‘Mango’)
del F.dispiay
F.display( )
Output:
Fruit 1 = Apple, Fruit 2 = Mango
Errors:
(i) Space between def and _init not allowed. (Correct statement is def_init_(self,f1,f2)
(ii) Space not allowed between Fruit and 1.
(iii) Space not allowed between Fruit and 2.
(iv) Space not allowed between Fruits and open bracket.
(v) del statement should not be allowed here.

Question 14.
What is the output of the following program?
Answer:
class Greeting:
def_init_(self, name):
self._name = name
def display(self):
print(“Good Morning”, self._name)
obj=Greeting(‘Bindu Madhavan’)
obj.display( )
Output:
Good morning Bindumadhavan.

Question 15.
How do define constructor and destructor in Python?
Answer:
(i) In python, there is a special function called ‘init’ which act as a constructor.
(ii) It must begin and end with double under j score.
(iii) This constructor function can be defined with or without arguments. This method is used initialize the class variables.
Eg:
class sample:
def _init_(self, num)
This example class sample has only a constructor with one argument named as num.
Destructor is also a special method gets executed automatically when an object exit from the scope. It is. just opposite to constructor.
In python, _del_() method is used as destructor.
Eg:
class sample:
def_del_(self):

Question 16.
Write a menu driven program to add or delete stationary items. You should use dictionary to store items and the brand.
Answer:
Class Dictionary:
def_init_(self):
self.dictionaryname =“ ”
self, brand =“ ”
def get data (self):
self.dictionaryname = input (“Type Dictionary name”)
self.brand = input (“Type brand name”)
def display (self):
Print(“Name of Dictionary”, self.dictionary)
printed (“Name of the company”, self.brand)
print (“\n”)
dictionary = [ ]
choice – ‘Y’
while (choice =‘y’):
print (“ 1. Add New Dictionary”)
resp = int (input (“Type your choice”))
if (resp =1):
D = Dictionary
D.getdata ( )
dictionary, append (D)
elif (resp==2):
for x in dictionary
x.display ( )
else:
print (“Invalid Input….”)
choice = input (“Do you continue”)

Question 17.
Write a program using class to store name | and marks of students in list and print total marks.
Answer:
Class student:
_stud_name = [ ]
_stud_markl = [ ]
_stud_mark2 = [ ]
_stud_mark3 = [ ]
defgetdata(self):
self.s = int(input(“Type the student Name and marks to store”))
for i in range (self.s):
self._stud_name.append(str(input(“Type Name”)))
self._stud_mark1.append(int(input (“TypeMarkl”)))
self._stud_mark2.append(int(input (“TypeMark2”)))
self._stud mark3.append(int(input (“TypeMark3”)))
total_marks = 0
totafmarks-total marks + self. __stud_mark1+ self. studjnark2 + self._stud_mark3
for i in range (self. S)
print (“student name\t markl \t mark2 \t mark3”)
print (self._stud_name [i], “\t”,
self _stud_markl [i], “\t”,
self._stud_mark2 [i], “\t”,
self._stud_mark3 [i], “\t”,
print (“Total marks =”, total marks)

Question 18.
Write a program using class to accept three I sides of a triangle and print its area.
Answer:
Class Triangle
def_int_(self, a, b, c):
self. a = a
self. b = b
self. c = c
def area (self):
S = (self. a + self. b+ self. c)/2
return (s*((s_selfa)*(s_selfb)* (s_selfc))) **0.5
a = input (“Type the value a”)
b = input (“Type the value b”)
c = input (“Type the value c”)
print (“Area =”, s. area ( ))

Question 19.
Write a menu driven program to read, display, add and subtract two distances.
Answer:
Class dist ( ):
def _init_(self, x1, y1, x2, y2):
self.x1 = x1
self.y1 = y1
self.x2 = x2
self.y2 = y2
def add(self):
return
((abs (x 1 +x2) * *2)+(abs(y 1 +y2)* *2 * * .5)
def sub (self):
return ((abs (x1-x2)**2) + (abs(y1-y2) **2**.5))
x1 = int (input(“Type xl value”))
x2 = int (input(“Type x2 value”))
y1 = int (input(“Type yl value”))
y2 = int (input(“Type y2 value”))
obj = cal (x1, x2, y 1, y2)
choice = 1
while choice ! = 0:
print (“0. Exit”)
print (“1. Add”)
print (“2. Subtract”)
Choice = int (input(‘Type choice”))
if choice == 1:
print (“Result”, obj. add( ))
elif choice == 2:
print (“Result”, obj.sub( ))
elif choice == 0:
print (“Exit’)
else:
print (“Invalid choice”)
print ( )

Choose the correct answer:

Question 1.
In python every class has a unique name followed by a:
(a) . (dot)
(b) : (colon)
(c) – (hyphen)
(d) ; (semi colon)
Answer:
(b) : (colon)

Question 2.
Class variable and methods are together known as:
(a) member of class
(b) methods
(c) class variable
(d) functions
Answer:
(a) member of class

Question 3.
Variables defined inside a class are called as
(a) member of class
(b) methods
(c) class variable
(d) function
Answer:
(c) class variable

Question 4.
What is the first arguments value defined the class method?
(a) self
(b) init
(c) proc
(d) obj
Answer:
(a) self

Question 5.
What is a special function called in python, i which act as constructor?
(a) self
(b) init
(c) proc
(d) obj
Answer:
(b) init

Question 6.
The public variables can be accessed anywhere in the program using:
(a) (.) dot operator
(b) & (ampersand)
(c) # (hash)
(d) % (percentage)
Answer:
(a) (.) dot operator

Question 7.
Which variable can be accessed only within the class?
(a) Pubilc
(b) Private
(c) Class variable
(d) Method
Answer:
(b) Private

Question 8.
Match the following:

(i) Class Variable	A. class method
(ii) Class Instantiation	B. constructor
(iii) init	C. object
(iv) self	D. inside a class

(a) (i) – D, (ii) – C, (iii) – B, (iv) – A
(b) (i) – D, (ii) – B, (iii) – A, (iv) – C
(c) (i) – B, (ii) – A, (iii) – C, (iv) – D
(d) (i) – B, (ii) – C, (iii) – D, (iv) – A
Answer:
(a) (i) – D, (ii) – C, (iii) – B, (iv) – A

Question 9.
Choose the incorrect pair:
(a) class – keyword
(b) Function – method
(c) constructor – object
(d) Destructor – exits
Answer:
(c) constructor – object

Question 10.
Choose the correct pair:
(a) . (dot) – class member
(b) _del_() – constructor
(c) _num – public
(d) : (colon) – object
Answer:
(a) . (dot) – class member

Question 11.
Choose the incorrect statement:
(a) Classes and object are the key features of OOP.
(b) Class is the main building block in python.
(c) Class is a template for the object.
(d) Class has unique name followed by a # (hash).
Answer:
(d) Class has unique name followed by a # (hash).

Question 12.
Choose the correct statement:
(a) Variable defined inside a class are called as class variable.
(b) Variable defined inside a functions are called constructor.
(c) Class variable and methods are together known as function.
(d) A Class can be defined only in the top of the python program.
Answer:
(a) Variable defined inside a class are called as class variable.

Question 13.
Assertion (A):
The process of creating object is called as class instantiation.
Reason (R):
Once a class is created, next you should create an object or instance of that class is known as process of object.
(a) Both A and R are true and R is the correct explanation for A.
(b) Both A and R are true and R is not the correct explanation for A.
(c) A is True but R is false.
(d) A is false but R is True.
Answer:
(a) Both A and R are true and R is the correct explanation for A.

Question 14.
Assertion (A):
In python, _del_ ( ) method is used as constructor.
Reason (R):
Constructor is special method gets executed automatically when an object exit from the scope.
(a) Both A and R are true and R is the correct explanation for A.
(b) A is true but R is false
(c) A is false but R is true
(d) Both A and R are false.
Answer:
(d) Both A and R are false.

Question 15.
Pick the odd one out:
(a) classes
(b) object
(c) destructor
(d) methods
Answer:
(c) destructor

Question 16.
By default, the class variable is:
(a) Public
(b) Private
(b) Protected
(d) local
Answer:
(a) Public

Question 17.
Which of the following called as instance of a class or class variable?
(a) methods
(b) objects
(c) class
(d) Function
Answer:
(b) objects

Question 18.
Which of the following are the key features of 1 an Object Oriented Programming language?
(a) Constructor and Classes
(b) Constructor and Object
(c) Classes and Objects
(d) Constructor and Destructor
Answer:
(c) Classes and Objects

Question 19.
Functions defined inside a class:
(a) Functions
(b) Module
(c) Methods
(d) section
Answer:
(c) Methods

Question 20.
Class members are accessed through which operator?
(a) &
(b) .
(c) #
(d) %
Answer:
(b) .

Question 21.
Which of the following method is automatically executed when an object is created?
(a) _object_( )
(b) _del_( )
(c) _fonc_( )
(d) _init_( )
Answer:
(d) _init_( )

Question 22.
A private class variable is prefixed with:
(a) _
(b) &&
(c) ##
(d)**
Answer:
(a) _

Question 23.
Which of the following method is used as destructor?
(a) _init_( )
(b) _dest ( )
(c) _rem_( )
(d) _del_( )
Answer:
(d) _del_( )

Question 24.
Which of the following class declaration is correct?
(a) class class_name
(b) class class_name<>
(c) class class_name:
(d) class class_name[ ]
Answer:
(c) class class_name:

Question 25.
Which of the following is the output of the following program?
class Student:
def __init__(self, name):
self.name=name
S=Student(“Tamil”)
(a) Error
(b) Tamil
(c) Name
(d) Self
Answer:
(b) Tamil

Question 26.
Which of the following is the private class variable?
(a) num
(b) ##num
(c) $$num
(d) &&num
Answer:
(a) num

Question 27.
The process of creating an object is called as:
(a) Constructor
(b) Destructor
(c) Initialize
(d) Instantiation
Answer:
(d) Instantiation

TN Board 12th Computer Science Important Questions

TN Board 12th Computer Science Important Questions Chapter 16 Data Visualization Using Pyplot: Line Chart, Pie Chart and Bar Chart

October 16, 2021

TN State Board 12th Computer Science Important Questions Chapter 16 Data Visualization Using Pyplot: Line Chart, Pie Chart and Bar Chart

Question 1.
What is Infographics?
Answer:
An Infographic is the representation of information in a graphic format.

Question 2.
Answer:
A Dashboard is a collection of resources assembled to create a single unified visual display.

Question 3.
What is Matplotlib?
Answer:

Matplotlib is the most popular data visualization library in python.
It allows you to create charts in few lines of code.

Question 4.
What is difference between Scatter plot and Box plot?
Answer:

Scatter plot	Box plot
A scatter plot is a type of plot that shows the data as a collection of points.	The Box plot is a standerdized way of displaying the distribution of data based on the five number summary.
The position of a point depends on its two dimensional value.	Minimum, first quartile, median, third quartile and maximum.

Question 5.
What is called markers?
Answer:
A line chart or line graph is a type of chart . which displays information as a series of data points called markers. It is connected by straight line segments.

Question 6.
What is pip?
Answer:

Matplotlib installed using pip.
Pip is a management software for installing python package.

Question 7.
What is the use of pan Axis?
Answer:
Pan Axis is cross-looking button allows you to click it, and then click and drag your graph around.

Question 8.
What are different kinds of plot that allows Matplotlib?
Answer:
Matplotlob allows you to crate different kinds of plots ranging from Histograms and scatter plots to bar graphs and bar charts.

Question 9.
How will you start to draw a chart?
Answer:
(i) By importing Matplotlib using the command import matplotlib.pyplot as pit.
(ii) Now you have imported Matplotlib in your work space. You need to display the plots.
(iii) Using Matplotlib from within a python script.
(iv) Now you have to add plt.show() method inside the file to display your plot.
Eg:
import malplotlib.pyplot as pit plt.
plot ([1, 2, 3, 4])
plt.show( )

Output:
TN State Board 12th Computer Science Important Questions Chapter 16 Data Visualization Using Pyplot Line Chart Pie Chart and Bar Chart 1

Question 10.
What are the key difference between Histogram and Bar graph.
Answer:
The differences between Histogram and bar graph are as follows:

Histogram	Bar Graph
Histogram refers to a graphical representation; that displays data by way of bars to show the frequency of numerical data.	A bar graph is a pictorial representation of data that uses bars to compare different categories of data.
A histogram represents the frequency distribution of continuous variables.	A bar graph is a diagrammatic comparison of discrete variables.
The histogram is drawn in such a way that there is no gap between the bars.	On the other hand, there is proper spacing between bars in a bar graph that indicates discontinuity.
Histogram presents numerical data.	Bar garaph shows categorical data.
Items of the histogram are numbers, which are categorised together, to represent ranges of data.	As opposed to the bar graph, items are considered as individual entities.
A histogram, this cannot be done, as they are shown in the sequence of classes.	Bar graph, it is quite common to rearrange the blocks, from highest to lowest.
The width of rectangular blocks in a histogram may or may not be same.	The width of the bars in a bar graph is always same.

Question 11.
Create a Bar chart on Range and Marks of plus two students.
Answer:
import matplotlib.pyplot as pit
labels=[“TAMIL”, “ENGLISH”, “MATHS”, “PHYSICS”, “CHEMISTRY”, “CS”]
usage – [79.8, 67.3, 77.8, 68.4, 70.2, 88.5]
y_positions = range (len(labels))
plt.bar (y positions, usage) plt.xticks (y_positions, labels)
plt.ylabel (“RANGE”) plt.title (“MARKS”)
lt.show( )
Output:

TN State Board 12th Computer Science Important Questions Chapter 16 Data Visualization Using Pyplot Line Chart Pie Chart and Bar Chart 2

Question 12.
Write a code to display the given plot, import matplotlib.pyplot as pit
Answer:
x = [1,2,3]
y= [5,7,4]
x2 = [1,2,3]
y2 = [10,14,12]
plt.plot(x, y, label=’Line 1’)
plt.plot(x2, y2, label=’Line 2’)
plt.xlabel(‘X-Axis’)
plt.ylabel(‘Y-Axis’)
plt.title(‘LINE GRAPH’)
plt.legend( )
plt.show( )

TN State Board 12th Computer Science Important Questions Chapter 16 Data Visualization Using Pyplot Line Chart Pie Chart and Bar Chart 15

Question 13.
Write a code to display the following plot. import matplotlib.pyplot as pit.
Answer:
plt.plot([1,2,3,4], [1,4,9,16])
plt.show( )

TN State Board 12th Computer Science Important Questions Chapter 16 Data Visualization Using Pyplot Line Chart Pie Chart and Bar Chart 16

Question 14.
Define: Data Visualization.
Answer:
Data visualization is the graphical representation of information and data.
The data visualization uses statistical graphics, Numerical data may be enclosed using dots, lines or bars, to visually communicate a quantitative message.

Question 15.
List the general types of data visualization.
Answer:
General types of Data visualization are charts, Tables, Graphs, Maps, Infographics and dashboards.

Question 16.
List the types of Visualizations in Matplotlib.
Answer:
There are many types of visualizations under matplotlib. Some of them are Line plot, Scatter plot, Histogram, Box plot, Bar chart and pie chart.

Question 17.
How will you install Matplotlib?
Answer:

Install matplotlib using pip. Python – m pip install – u pip
Pip is a management software for installing python packages.
After installing matplotlib, we will begin coding importing matplotlib.

Question 18.
Write the difference between the following functions: pltplot([1,2,3,4]), pit plot([1,2,3,4], [1,4,9,16]).
Answer:

TN State Board 12th Computer Science Important Questions Chapter 16 Data Visualization Using Pyplot Line Chart Pie Chart and Bar Chart 3

Question 19.
Draw the output for the following data visualization plot.
Answer:
import matplotlib.pyplot as pit
plt.bar([l,3,5,7,9],[5,2,7,8,2], label=”Example one’7)
plt.bar([2,4,6,8,10],[8,6,2,5,6], label=”Example two”, color=’g’)
pit.legend( )
plt.xlabel(‘bar number’)
plt.ylabel(‘bar height’)
plt.title(‘Epic Graph\nAnother Line! Whoa’)
plt.show( )

TN State Board 12th Computer Science Important Questions Chapter 16 Data Visualization Using Pyplot Line Chart Pie Chart and Bar Chart 4

Question 20.
Write any three uses of data visualization.
answer:
Uses of Data visualization:

Data visualization helps users to analyze and interpret the data easily.
It makes complex data understandable and usable.
Various charts in Data visualization 1 helps to show relationship in the data one or more.

Question 21.
Write the coding for the following:
(a) To check if PIP is Installed in your PC.
(b) To Check the version of PIP installed in your PC.
(c) To list the packages in matpiotlib.
Answer:
(a) c:\users\yourName\AppData\Local\ program s\python\python3 6-3 2\ scripts>pip
(b) c:\users\yourName\AppData\Local\ programs\python\python36-32\ j scripts>pip – versions.
(c) c:\users\yourName\AppData\Local\ programs\python\python36-32\ scripts>pip — list

Question 22.
Write the plot for the following pie chart output.

TN State Board 12th Computer Science Important Questions Chapter 16 Data Visualization Using Pyplot Line Chart Pie Chart and Bar Chart 5

Answer:
import matplotlib.pyplot as pit
slices = [7, 2, 2, 13]
Activities = [‘Sleeping’, ‘Eating’, ‘Working’, ‘Playing’]
Cols = [‘c’, ‘m’, ‘r’, ‘b’]
plt.pie(slices, labels = Activities,
colors – cols
startangle = 90,
shadow = True,
explode = (0, 0.1, 0, 0),
autopct = ‘% 1.1 f%%’),
Plt.title (“Interesting Graph \n check it out”)
pit. show ( )

Question 23.
Explain in detail the types of pyplots using Matpiotlib.
Answer:
Types of pyplots using matpiotlib:
Matpiotlib allows to create different kinds of j plots ranging from Histograms and scatter I plots to bar graphs and bar charts.
(i) Line chart:
A Line chart or Line Graph is a type of chart which displays information as a series of data points called ‘markers’ connected by straight line segments.
A line chart is often used to visualize a trend in data over intervals of time – a time series – thus the line is often drawn chronologically.

TN State Board 12th Computer Science Important Questions Chapter 16 Data Visualization Using Pyplot Line Chart Pie Chart and Bar Chart 6

(ii) Bar chart:
A Bar chart or Bar plot is one of the most common type of plot. It shows the relationship between a numerical variable and a categorical variable. Bar plot represents categorical data with rectangular bars.
Each bar has a height corresponds to the value it represents. The bar can be plotted vertically or horizontally.

TN State Board 12th Computer Science Important Questions Chapter 16 Data Visualization Using Pyplot Line Chart Pie Chart and Bar Chart 7

Pie charts:
Pie chart is probably one of the most common type of chart.

TN State Board 12th Computer Science Important Questions Chapter 16 Data Visualization Using Pyplot Line Chart Pie Chart and Bar Chart 8

It is a circular graphic which is divided into slices to illustrate numerical proportion.
To make a pie chart with matplotlib, we vcan use the plt.pie ( ) function.

Question 24.
Explain the various buttons in a matplotlib window.
Answer:

TN State Board 12th Computer Science Important Questions Chapter 16 Data Visualization Using Pyplot Line Chart Pie Chart and Bar Chart 9
Home Button → The Home Button will help once you have begun navigating your chart.
Forward/Back buttons → These buttons can be used like the Forward and Back buttons in your browser.
Pan Axis → This cross-looking button allows you to click it and then click and drag your graph around.
Zoom → The Zoom button lets you click on it, then click and drag a square that you would like to zoom into specifically. Zooming in will require a left click and drag. You can alternatively zoom out with a right click and drag.
Configure Subplots → This button allows you to configure various spacing options with
your figure and plot.
Save Figure → This button will allow you to save your figure in various forms.

Question 25.
Explain the purpose of the following functions:
(i) plt.xlabel (ii) plt.ylabel (iii) plt.title (iv) plt.legend( ) (v) plt.show ( )
Answer:
(i) plt.xlabel – we can assign labels to those respective x-axis.
(ii) plt.ylabel – we can assign labels to those respective y-axis.
(iii) plt.title – we can assign the plot’s title, i.e., Heading of the plot.
(iv) pit.legend ( ) – This command, which automatically a legend for any labeled plot elements.
(v) plt.show ( ) – It will display the current figure that you are working on.

Question 26.
Create a plot. Set the title, the x and y labels for both axes.
Answer:
import matplotlib.pyplot as pit.
X = [1, 2, 3]
Y= [5, 7, 4]
plt.polt (x,y, label = ‘Linel’)
plt.xlabel (‘x-Axis’)
plt.ylabel (‘y-Axis’)
plt.title (‘LINE GRAPH’)
pit.legend ( )
plt.show ( )

Question 27.
Plot a pie chart for your marks in the recent examination.
Answer:
import matplotlib.pyplot as plt
plt.style.use(‘gg plot’)/(‘pie plot’)
subject = (‘TAMIL’,‘ENGLISH’, ‘PHYSICS’, ‘CHEMISTRY’, ‘MATHS’, ‘COMP.SCIENCE’)
Marks = [78,79,95,96,98,99]
Pie-color = (“red”,“green”,“orange”,“cyan”, “blue”)
figl ax = plt.subplots( )
ax.pie(Subjects, Labels = Marks, autoplt = %l.If%%, “colors = Pie color, Starangle = 90)
ax.axis(equal)
ax.set_title(“MY RECENT MARKS\n”, Font size – 25)
plt.show( )

Question 28.
Plot a linechart on the academic performance of Class 12 students in Computer Science for the past 10 years.
Answer:
import matplotlib.pyplot as pit
Performance = [100,99,98,70,80,90,85,89, 60,75)
line_chart = plt.plot(range(50,100), Performance)
plt.title(“Academic Performance of class 12 students in Computer Science past 10 years”)
plt.xlabel(‘Performance’)
plt.ylabel(‘Years’)
plt.legend([Performance of Comp.Science’], 10c = 4)
plt.show( )

Question 29.
Plot a bar chart for the number of computer science periods in a week.
Answer:
import matplotlib.pyplot as pyplot
from Tools.demo.sortview import WIDTH
from tortle demo.nim import color
pyplot.bar([‘MON’,‘TUE’,‘WED’, ‘THU’, ‘FRI’], WIDTH = 0.5,)
color = ([‘blue’,‘orange’,‘red’,‘green’])
pyplot.xlabel(“Periods in a week”)
pyplot.ylabel(“Days of week”)
pyplot.show( )

Choose the correct answer:

Question 1.
Which is the representation of information in a graphic format?
(a) Infographic
(b) Dashboard
(c) Matplotlib
(d) Visual format
Answer:
(a) Infographic

Question 2.
Which is a collection of resources assembled to create a single unified visual display?
(a) Infographic
(b) Dashboard
(c) Matplotlib
(d) Visual format
Answer:
(b) Dashboard

Question 3.
Which is the most popular data visualization library in python?
(a) Infographic
(b) Dashboard
(c) Matplotlib
(d) Visual format
Answer:
(c) Matplotlib

Question 4.
Which is a type of plot that shows the data as a collection of points?
(a) Scatter plot
(b) Box plot
(c) Line plot
(d) Bar plot
Answer:
(a) Scatter plot

Question 5.
Which is a standardized way of displaying the distribution of data based plot?
(a) Scatter plot
(b) Box plot
(c) Line plot
(d) Bar plot
Answer:
(b) Box plot

Question 6.
Which method is used inside the file to display your plot?
(a) plt.show
(b) plt.legend
(c) plt.plot
(d) plt.title
Answer:
(a) plt.show

Question 7.
Which button allows you to click it and then click and drag your graph around?
(a) Home
(b) Pan Axis
(c) Zoom
(d) Back
Answer:
(b) Pan Axis

Question 8.
Which chart displays information as a series ; of data points?
(a) Line
(b) Pie
(c) Histogram
(d) Bar
Answer:
(a) Line

Question 9.
Which plot is one of the common type?
(a) Line
(b) Pie
(c) Histogram
(d) Bar
Answer:
(d) Bar

Question 10.
Which plot is probably one of the most common type?
(a) Line
(b) Pie
(c) Histogram
(d) Bar
Answer:
(b) Pie

Question 11.
Match the following:

(i) Line chart	A. two-dimension
(ii) Bar chart	B. auto pit
(iii) Pie chart	C. catergorical data
(iv) Scatter plot	D. markers

(a) (i) – D, (ii) – C, (iii) – B, (iv) – A
(b) (i) – D, (ii) – A, (iii) – B, (iv) – C
(c) (i) – B, (ii) – C, (iii) – A, (iv) – D
(d) (i) – B, (ii) – D, (Hi) – A, (iv) – C
Answer:
(a) (i) – D, (ii) – C, (iii) – B, (iv) – A

Question 12.
Choose the incorrect pair:
(a) Infographic – Information
(b) Matplotlib – Library
(c) Dashboard – Multi plot
(d) Pip – Software
Answer:
(c) Dashboard – Multi plot

Question 13.
Choose the correct pair (Buttons):
(a) Home – begun
(b) PAN – Forward
(c) Zoom – drag
(d) Subplot – Back
Answer:
(a) Home – begun

Question 14.
Choose the incorrect statement.
(a) Numerical data may be encoded using only pictures.
(b) Data visualization helps users to analyze and interpret the data easily.
(c) Complex data understandable and usable by using charts.
(d) Various charts in Data visualization help to show relationship in the data.
Answer:
(a) Numerical data may be encoded using only pictures.

Question 15.
Choose the correct statement.
(a) Bar charts represent categorical data with rectangular bars.
(b) Bar chart can be plotted only vertically.
(c) The Box plot is a data based on the three number summary.
(d) Scatter plot is a point depend on its three dimensional value.
Answer:
(a) Bar charts represent categorical data with rectangular bars.

Question 16.
Assertion ( A):
Matplotlib is the most popular data visualization library in python.
Reason (R):
It allows you to create charts in few lines of code.
(a) Both A and R are True and R is the correct explanation for A.
(b) Both A and R are True but R is not the correct explanation for A.
(c) A is True but R is False.
(d) A is False but R is True.
Answer:
(a) Both A and R are True and R is the correct explanation for A.

Question 17.
Assertion (A):
Histogram refers to a graphical representation of data.
Reason (R):
A Bar graph is a pictorial representation of data.
(a) Both A and R are True and R is the correct explanation for A.
(b) Both A and R are True but R is not the correct explanation for A.
(c) A is True but R is False.
(d) A is False but R is True.
Answer:
(b) Both A and R are True but R is not the correct explanation for A.

Question 18.
Pick the odd one out.
(a) Line
(b) Scatter
(c) Box
(d) Zoom
Answer:
(d) Zoom

Question 19.
Matplotlib is a:
(a) Function name
(b) Reserved word
(c) Library
(d) Key word
Answer:
(c) Library

Question 20.
Matplotlib allows to create a:
(a) graphics
(b) maps
(c) picture
(d) charts
Answer:
(d) charts

Question 21.
How many types of visualizations under matplotlib?
(a) five
(b) six
(c) seven
(d) many
Answer:
(d) many

Question 22.
Which is a type of plot that shows the data as a collection of points?
(a) Line plot
(b) Box plot
(c) Scatter plot
(d) Pie plot
Answer:
(c) Scatter plot

Question 23.
Which plot is the distribution of data based on the five number summary?
(a) Line plot
(b) Box Plot
(c) Scatter plot
(d) pie plot
Answer:
(b) Box Plot

Question 24.
Which command is used to import matplotlib for coding?
(a) import matplotlib.pyplot as pit
(b) import matplotlib.pypt as pt
(c) import matplotlb.pyplt as Pit
(d) import mathplotlb.pyplot as pit
Answer:
(a) import matplotlib.pyplot as pit

Question 25.
Which method will be add inside the file to display plot?
(a) display ( )
(b) show ( )
(c) print ( )
(d) write ( )
Answer:
(b) show ( )

Question 26.
The default x.vector has the same length of y but starts with
(a) 0
(b) 1
(c) 2
(d) 3
Answer:
(a) 0

Question 27.
Which button is used to navigate the chart?
(a) Ctrl
(b) ALT
(c) Home
(d) End
Answer:
(c) Home

Question 28.
Which button is used to click and drag a graph around?
(a) Drag
(b) Home
(c) ALT
(d) pan
Answer:
(d) pan

Question 29.
Which type of chart shows the relationship between a numerical and categorical variable?
(a) Line
(b) Bar
(c) Pie
(d) Histogram
Answer:
(b) Bar

Question 30.
Which type of chart to show the frequency of numerical data?
(a) Line
(b) Bar
(c) Pie
(d) Histogram
Answer:
(d) Histogram

Question 31.
Which type of chart to indicates discontinuity?
(a) Line
(b) Bar
(c) Pie
(d) Histogram
Answer:
(b) Bar

Question 32.
Which type of chart, the width of the bar is always same?
(a) Line
(b) Bar
(c) Pie
(d) Histogram
Answer:
(b) Bar

Question 33.
Which type of chart is a circular graphical representation of numeric data?
(a) line
(b) bar
(c) pie
(d) Histogram
Answer:
(c) pie

Question 34.
Which is a python package used for 2D graphics?
(a) matplotlib.pyplot
(b) matplotlib.pip
(c) matplotlib.numpy 4
(d) matplotlib.pit
Answer:
(a) matplotlib.pyplot

Question 35.
Identify the package manager for Python ackages, or modules.
(a) Matplotlib
(b) PIP
(c) plt.show( )
(d) python package
Answer:
(b) PIP

Question 36.
Read the following code: Identify the purpose of this code and choose the right option from the following.
C:\Users\YourName\AppData\Local\ Programs\Python\Python36-32\ Scripts>pip – version
(a) Check if PIP is Installed
(b) Install PIP
(c) Download a Package
(d) Check PIP version
Answer:
(a) Check if PIP is Installed

Question 37.
Read the following code: Identify the purpose of this code and choose the right option from the following.
C:\Users\YourName\AppData\Local\ Programs\Python\Python3 6-3 2\ Scripts>pip list
(a) List installed packages
(b) list command
(c) Install PIP
(d) packages installed
Answer:
(a) List installed packages

Question 38.
To install matplotlib, the following function will be typed in your command prompt. What does “-U”represents?
Python -m pip install -U pip
(a) downloading pip to the latest version
(b) upgrading pip to the latest version
(c) removing pip
(d) upgrading matplotlib to the latest version
Answer:
(b) upgrading pip to the latest version

Question 39.
Observe the output figure. Identify the coding for obtaining this output.

TN State Board 12th Computer Science Important Questions Chapter 16 Data Visualization Using Pyplot Line Chart Pie Chart and Bar Chart 10

(a) import matplotlib.pyplot as pit
plt.plot([l,2,3],[4,5,l])
plt.show( )

(b) import matplotlib.pyplot as pit
plt.plot([l,2],[4,5])
plt.show( )

(d) import matplotlib.pyplot as pit
plt.plot([l,3],[4,l])
plt.show( )
Answer:
(a) import matplotlib.pyplot as pit
plt.plot([l,2,3],[4,5,l])
plt.show( )

Question 40.
Read the code:
(a) import matplotlib.pyplot as pit
(b) plt.plot(3, 2)
(c) plt.show( )
Identify the output for the above coding.
(a) TN State Board 12th Computer Science Important Questions Chapter 16 Data Visualization Using Pyplot Line Chart Pie Chart and Bar Chart 11

(b) TN State Board 12th Computer Science Important Questions Chapter 16 Data Visualization Using Pyplot Line Chart Pie Chart and Bar Chart 12

(c) TN State Board 12th Computer Science Important Questions Chapter 16 Data Visualization Using Pyplot Line Chart Pie Chart and Bar Chart 13

(d) TN State Board 12th Computer Science Important Questions Chapter 16 Data Visualization Using Pyplot Line Chart Pie Chart and Bar Chart 14

Answer:
(c) TN State Board 12th Computer Science Important Questions Chapter 16 Data Visualization Using Pyplot Line Chart Pie Chart and Bar Chart 13

Question 41.
Which key is used to run the module?
(a) F6
(b) F4
(c) F3
(d) F5
Answer:
(d) F5

Question 42.
Identify the right type of chart using the following hints.
Hint 1: This chart is often used to visualize a trend in data over intervals of time.
Hint 2: The line in this type of chart is often drawn chronologically.
(a) Line chart
(b) Bar chart
(c) Pie chart
(d) Scatter plot
Answer:
(a) Line chart

Question 43.
Read the statements given below. Identify the right option from the following for pie chart.
Statement A:
To make a pie chart with Matplotlib, we can use the plt.pie( ) function.
Statement B:
The autopct parameter allows us to display the percentage value using
the Python string formatting.
(a) Statement A is correct
(b) Statement B is correct
(c) Both the statements are correct
(d) Both the statements are wrong
Answer:
(c) Both the statements are correct

TN Board 12th Computer Science Important Questions

TN Board 12th Computer Science Important Questions Chapter 15 Data Manipulation Through SQL

October 16, 2021

TN State Board 12th Computer Science Important Questions Chapter 15 Data Manipulation Through SQL

Question 1.
What is use of ‘commit’ command in sql?
Answer:

The ‘commit’ command is used to any changes made in the values of the record should be saved.
This command is used before closing the Table connection.

Question 2.
What is mean by populate in SQL?
Answer:

Populate mean add record in the Table
To populate the table INSERT command is passed to SQLite.

Question 3.
What are Aggregate function used SQL Group?
Answer:
The Aggregate functions are COUNT ( ), SUM ( ), MIN ( ), AUG ( ), MAX ( ).

Question 4.
What are clauses that can be used in the SELECT statements in SQL?
Answer:
SQL provides various clauses that can be used in the SELECT statements. This clauses are DISTINCT, WHERE, GROUPBY, ORDERBY and HAVING.

Question 5.
Write the functions of MAX ( ) and MIN ( ) in SQL.
Answer:

MAX ( ) – This function returns the largest value of the selected column.
MIN ( ) – This function returns the smallest value of the selected column.

Question 6.
What is advantage of SQLite?
Answer:

SQLite is fast, rigorously tested and flexible, making it easier to work.
Python has a native library for SQLite.

Question 7.
What is master table?
Answer:
SQLitejmaster is the master table which holds the key information about your database tables.

Question 8.
How the cursor object is created?
Answer:

The cursor object is created by calling the cursor ( ). method of connection.
The cursor is used to traverse the records from the result set.

Question 9.
List the classes used in the SQL SELECT statement.
Answer:

DISTINCT
WHERE
GROUP BY
ORDER BY
HAVING

Question 10.
How will you creating a Database using SQLite?
Answer:
Creating a Database using SQLite, the commands are
import sqlite3 # importing module first
connection = sqliteB.connect (“stud.db”)
# connecting database to be created
Cursor = connection.cursor ( )
In this example, a database name ‘stud.db’ would be created database.

Question 11.
Write an example for creating a table in the SQL database.Table Name student.
Answer:
CREATE TABLE student
(ROLL NO INTEGER PRIMARY KEY,
SName VARCHAR (20),
Grade CHAR(l),
Gender CHAR (1).
Average Float (6,2)
DOB Date);

Question 12.
Write a python program to accept data using input () command during run time.
Answer:
# code for executing query using input data import sqlite3
con =sqlite3.connect(“Academy.db”)
cur = con. cursor!) cur.execute(“DROP Table person”)
cur.execute(“create table person (name, age, id)”)
print(“Enter 5 students names:”)
who =[input() for i in range(5)]
print(“Enter their ages respectively:”)
age =[int(input( )) for i in range(5)]
print(“Enter their ids respectively:”)
p_id =[int(input( ))for i in range(5)]
n =len(who)
for i in range(n):
cur.execute(“insert into person values (?, ?, ?)”, (who[i], age[i], p_id[i]))
cur.execute(“select * from person”)
# Fetches all entries from table
print(“Displaying All the Records From Person Table”)
print (*cur.fetchall( ), sep=‘\n’)

Question 13.
Write a python program to query more than one table by joing them.
Answer:
(Table name: student, Appointment)
import sqlite3
connection = sqlite3.connect (“Academy, db”)
cursor = connection.cursor( )
cursor.execute(“““DROP TABLE Appointment; ”””)
sqlcommand = “““
CREATE TABLE Appointment (rollnointprimarkey,Duty varchar( 10),age int)”””
cursor.execute(sqlcommand)
sqlcommand = “““INSERT INTO Appointment (Rollno,Duty ,age)
VALUES (“1”, “Prefect”, “17”);”””
cursor.execute(sql_command)
sql_command = “““INSERT INTO Appointment (Rollno, Duty, age)
VALUES (“2”, “Secretary”, “ 16”);”””
cursor. execute(sql_command)
connection.commit( )
cursor. execute(“SELECT student.rollno, student, sname, Appointment.
Duty,Appointment.Age FROM student, Appointment where student.
rollno = Appointment.rollno”)
co = [i[0] for i in cursor.description]
print(co)
result = cursor. fetchall( )
for r in result:
print(r)

Question 14.
Mention the users who uses the Database.
Answer:
Users of database can be human users, other programs or applications.

Question 15.
Which method is used to connect a database? Give an example.
Answer:
Connect ( ) method is used to connect a database and pass the name of the database file.
Eg: Connection = sqlite3.connect (“Academy.db”)

Question 16.
What is the advantage of declaring a column as “INTEGER PRIMARY KEY”
Answer:
If a column of a table is declared to be an INTEGER PRIMARY KEY, then whenever a NULL will be used as an input for this column, the NULL will be automatically converted into an integer which will one larger than the highest value so for used in that column.
Eg: RollNo INTEGER PRIMARY KEY.

Question 17.
Write the command to populate record in a table. Give an example.Answer:
(i) INSERT command is to populate record in a Table.
(ii) To populate (add record) the table
INSERT command is passed to SQLite. “execut e” method
executes the SQL command to perform some action.
Eg:
sql_command = “ “INSERT INTO
student (RollNo, sname, Grade)

Question 18.
Which method is used to fetch all rows from the database table?
Answer:
Fetchall ( ) method is to fetch all rows from the database table.
Eg: res = cursor.Fetchall ( )

Question 19.
What is SQLite?What is it advantage?
Answer:
(i) SQLite is a simple relational database system, which saves its data in regular data files or even in the internal memory of the computer.
(ii) It is designed to be embedded in applications, instead of using a separate database server program.
(iii) The advantage of SQLite is fast, rigorously tested, and flexible, making it easier to work. Python has a native library for SQLite.

Question 20.
Mention the difference between fetchone( ) and fetchmany( ).
Answer:

fetchone ( )	fetchmany ( )
The fetchone ( ) method returns the next row of a query result set or none in case there is row left.	fetchmany ( ) method that returns the next number of rows (n) of the result set.
Using while loop and fetchone ( ) method we can , display all the records from a table.	Displaying specified number of records is done by using fetchmany ( ).
Fetch the next row of a query result set, returning a single tuple, or none when no more data is available.	Fetch the next set of rows of a query, returning a list of tuples. An empty list is returned when no more rows are available.
Eg: res = cursor, fetchone ( )	Eg: res = cursor, fetchmany (3)

Question 21.
What is the use of Where Clause. Give a python statement Using the where clause.Answer:
(i) The WHERE clause is used to extract only those records that fulfill a specified condition.
(ii) The WHERE clause can be combined with AND, OR and NOT operators.
(iii) WHERE clause cannot be used along with GROUPBY.
(iv) The AND or OR operators are used to . filter records base on more than one condition.
Eg:
cursor.execute(“SELECT ROLLNO, TOTAL FROM student WHERE (Total >=400 AND Total < = 600)”)

Question 22.
Read the following details.Based on that write a python script to display department wise records
database name organization.db
Table nameEmployee
Columns in the table Eno, EmpName, Esal, Dept
Answer:
import sqlite3
connection = sqlite3.connect (“organization, .db”)
cursor = connection, cursor ( )
CREATE TABLE Employee(
Eno INTEGER PRIMARY KEY,
EmPName VARCHAR (20),
Esal DECIMAL (6,2)
Dept VARCHAR (20);
cursor.execute (sql_command)
sql command = “ ” INSERT INTO organization (Eno, EmpName, Esal, Dept)
VALUES (NULL, “GOPU”, “9562.50”, “EDUCATION”);
Cursor, execute(sql_command)
Connection.commit ( )
connection.close( )

Question 23.
Read the following details.Based on that write a python script to display records in
descending order of
Eno
database name:- organization.db
Table name:- Employee
Columns in the table:- Eno, EmpName, Esal, Dept.
Answer:
import sqlite3
connection = sqlite3.connect (“organization, db”)
cursor = connection,cursor ( )
CREATE TABLE Employee (
Eno INTEGER PRIMARY KEY,
EmPName VARCHAR (20),
Esal DECIMAL (6, 2)
Dept VARCHAR (20);
cursor.execute(“SELECT * FROM organization ORDER BY NAME DESC”)
sql-command = “ ” INSERT INTO
organization (Eno, EmpName, Esal, Dept)
VALUES (NULL, “GOPU”, “9562.50”, “EDUCATION”);
Cursor.execute(sqlcommand)
Connection.commit ( )
connection.close( )

Question 24.
Write in brief about SQLite and the steps used to use it.
Answer:
(i) SQLite is a simple relational database system, which saves its data in regular data files or even in the internal memory of the computer.
(ii) SQLite is designed to be embedded in
applications, instead of using a separate database server program such as MySQL or Oracle.
(iii) SQLite is fast, rigorously tested and flexible, making it easier to work.
Python has a native library for SQLite.
To use SQLite
Step 1 – import sqlite3
Step 2 – Create a connection using connect ( ) method and pass the name of the database file.
Step 3 – Set the cursor object cursor = connection, cursor ( )
(iv) In python, all the commands will be executed using cursor object only.
(v) To create a table in the database create an object and write the SQL command in it.
Eg: sql_comm = “SQL statement”.

Question 25.
Write the Python script to display all the records of the following table using fetchmany( ).
Answer:

Icode	ItemName	Rate
1003	Scanner	10500
1004	Speaker	3000
1005	Printer	8000
1008	Monitor	15000
1010	Mouse	700

import sqlite3
connection = sqlite3.connect (“ITEM”)
cursor = connection,cursor ( )
CREATE TABLE items (
Icode INTEGER PRIMARY KEY,
Item Name VARCHAR (20),
Rate DECIMAL (8,2);
Itemlist = [(“1003”, “scanner”, “10500”),
(“1004”, “Speaker”, “3000”),
(“1005”, “Printer”, “8000”),
(“1008”, “Monitor”, “ 15000”),
(“1010”, “Mouse”, “700”)],
sqlcommand = formatstr.format
(Icode =p[0], ItemName = p[l], Rate = p[2])
Cursor.execute(sql_command)
Connection.commit ( )
cursor.execute (“SELECT * FROM ITEM”)
result = cursor.fetchall ( )
for i in result:
print (r)

Question 26.
What is the use of HAVING clause. Give an example python script.
Answer:
# Example python script using Having clause
import sqlite3
db = sqlite3. connect (“test.sqlite”)
cursor = db.cursor ( )
sql = “SELECT* FROM results”
Cursor.execute(sql)
for row in cursor:
print row
sql = (“SELECT source, receiver, level FROM)
results WHERE percentage > 0.4”
“GROUP BY Source, receiver HAVING Percentage = min (percentage)”)
cursor.execute (sql)
for row in cursor:
print row

Question 27.
Write a Python script to create a table called ITEM with following specification.
Add one record to the table.
Name of the database :- ABC
Name of the table :- Item
Column name and specification :-
Answer:

Icode	:-	integer and act as primary key
Item Name	:-	Character with length 25
Rate	:-	Integer
Record to be added	:-	1008, Monitor, 15000

Import Sqlite 3
connection = sqlite3.connect (“ABC .db”)
cursor = connection,cursor ( )
sqlcommand = “ ”
CREATE TABLE item (
Icode INTEGER PRIMARY KEY,
Item Name VARCHAR (25),
Rate INTEGER;
Cursor.execute(sql_command)
“Sql command” = “ ” INSERT INTO Item ( Icode, ItemName,Rate)
VALUES (NULL, “1008”, “Monitor”, “15000”) ”’
Cursor.execute(sql_command)
Connection.commit ( )
connection.close( )

Question 28.
Consider the following table Supplier and item. Write a python script for (i) to (ii).
Answer:

TN State Board 12th Computer Science Important Questions Chapter 15 Data Manipulation Through SQL 1

(i) Display Name, City and Itemname of suppliers who do not reside in Delhi.
(ii) Increment the SuppQty of Akila by 40 import sqlite3
connection = sqlite3. connect (“Supplier.db”)
cursor = connection.cursor ( )
item = [(“S001”, “Prasad” “Delhi”, “1008”, “100”),
(“S002”, “Anu”, “Bangalore”, ‘1010’, “200”),
(“S003”, “Sahid”, “Bangalore”, “1008”, “175”),
(“S004”, “Akila”, “Hyderabad”, “1005”, “195”),
(“S005”, “Girish”, “Hyderabad”, “1003”, “25”),
(“S006”, “Shylaja”, “Chennai”, “1008”, “180”),
(“S007”, “Lavanya”, “Mumbai”, “1005′, “325”);
for p in item:
format_str = “INSERT INTO item (suppno, Name, city, Icode, suppQty)
VALUES (NULL, “{suppno}”, “{Name}”, “{city}”, “{Icode}”, “{suppQty}”);“‘ “‘
sql_command = format_str.format (suppno = p[0],
Name = p[l], city = p[2], Icode =p[3], suppQty = p[4])
Cursor.execute(sql_command)
Connection.commit ( )
Cursor. execute(“SELECT Name, city, Icode FROM item WHERE (city < > “Delhi”)”)
Cursor.execute(“SELECT Name, suppQty FROM
item WHERE (Name = “AKILA” And p(4)+40)”)
result = cursor.fetchall ( )
print (result)

Question 29.
Create an interactive program to accept the details from user and store it in a csv file using Python for the following table.
Database name;- DB1; Table name: Customer

TN State Board 12th Computer Science Important Questions Chapter 15 Data Manipulation Through SQL 2

Answer:
import sqlite3
import io
import csv
sql_command = “‘ “‘
CREATE TABLE Customer (cust_Id INT PRIMARY KEY),
cust_Name VARCHAR (20),
Address VARCHAR (30),
phoneno VARCHAR (10),
city VARCHAR (10);
sql_command = “ ” INSERT INTO customer (cust_Id, cust_Name, Address, phone no, city)
VALUES (“C008”, “Sandeep”, “141, Pritam pura”, “41206819”, “Delhi”); ”’ “‘
cursor.execute (sql_command)
sql_command = “‘ ”’ INSERT INTO customer(cust_Id, custName, Address, phone_no, city)
VALUES (“C010”, “Anurag Basu”, “15A, park Road”, “61281921”, “Kolkatta”);‘“ ”’
cursor, execute (sql_command)
sql command = “‘ ”’ INSERT INTO customer(cust_Id, custName, Address, phone_no, city)
VALUES (“C012”, “Hrithik”, “7/2 vasant Nagar”, “26121949”, “Delhi”);’” “’
cursor, execute (sql command)
connection. commit( )
# Creating csv file
d = open (‘c:\pyprg\cust.csv’,‘w’)
c = csv.write (d)
connection = sqlirte3.connect (“Dbi.db”)
cursor = connection.cursor ()
Cursor.execute(“SELECT*FROM customer ORDER BY Phone_no”)
Cu = [i[0] for i in cursor.description]
c.writerow(Cu)
data = Cursor.fetchall( )
for item in data:
c. writerow (item)
d. close ( )
with open (‘c: \pyprg\cust.csv’; newline = None) as fd:
for line in fd:
line = line.replace(“\n”,“ ”)
print (line)
Cursor.close ( )
Connection.close ( )

Question 30.
Consider the following table GAMES. Write a python program to display the records for question (i) to (iv) and give outputs for SQL queries (v) to (viii).
Answer:

TN State Board 12th Computer Science Important Questions Chapter 15 Data Manipulation Through SQL 3

(i) To display the name of all Games with their Geodes in descending order of their schedule date.
(ii) To display details of those games which are having Prize Money more than 7000.
(iii) To display the name and gamename of the Players in the ascending order of Gamename.
(iv) To display sum of PrizeMoney for each of the Number of participation groupings (as shown in column Number 4}
(v) Display all the records based on GameName.
import sqlite3
connection – sqlite3.connect (“Game.db”)
cursor = connection,cursor ( )
game_data = [(“101”, “Padmaja”, “carom Board”, “2”, “5000”,“01-23-2014”),
(“102”, “Vidhya”, “Badminton”, “2”, “12000”,“ 12-12-2013”),
(“103”, “Guru”, “Table Tennis”, “4”, “ 18000”,“02-14-2014”),
(“105”, “Keerthana”, “carom Board”, “2”, “9000” ,“01-01-2014”),
(“108”, “Krishna”, “Table Tennis”, “4”, “25000”,“03-19-2014”),
for p in game_data:
format_str = ”’ INSERT INTO games
(Geode, Name, GameName, Number, Prizemoney, ScheduleDate)
VALUES (NULL, “{Geode }”, “{Name}”, “{GameName }”, “{Number “{Prizemoney}” “{ScheduleDate}”);’”
sql_command – format_str. format (Geode =p[0],
Name = p[1], GameName = p[2], Number = p[3], prizemoney = p[4], ScheduleDate = P[5])
Cursor.execute(sql_ command)
Connection.commit ( )
Cursor. execute(“SELECT*FROM games ORDER BY scheduledate DESC, Geode,GameN ame”)
Cursor.execute(“SELECT game Name, prizemoney FROM games WHERE (prize money>7000)”)
Cursor.execute(“SELECT*FROM games, game name, gameName ASCN)
Cursor.execute(“SELECT*FROM games GROUPBY
Gamename. HAVING SUM
(Number*prizemoney”)
Cursor.execute(“SELECT*FROM games ORDER BY Game Name ASCE, Game Name”)
result = cursor. fetchall( )
for r in result
print (r)
connection.close ( )

Choose the best answer:

Question 1.
Python program can interact as a user of an:
(a) SQL database
(b) MS Word
(c) Star. Writer
(d) None
Answer:
(a) SQL database

Question 2.
Which statement in SQL is used to retrieve or fetch data from the table in a database?
(a) INSERT
(b) SELECT
(c) FROM
(d) ORDERBY
Answer:
(b) SELECT

Question 3.
Which method is returns the next row of a query result set?
(a) fetchall ( )
(b) fetchone ( )
(c) fetchmany ( )
(d) Both A and B
Answer:
(b) fetchone ( )

Question 4.
Which method is displaying specified number of records is done?
(a) fetchall ( )
(b) fetchone ( )
(c) fetchmany ( )
(d) Both A and B
Answer:
(c) fetchmany ( )

Question 5.
Which clause is used to extract only those records that fulfill a specified condition in SQL?
(a) WHERE
(b) DISTINCT
(c) HAVING
(d) GROUPBY
Answer:
(a) WHERE

Question 6.
Which clause is used by groups records into summary rows in SQL?
(a) WHERE
(b) DISTINCT
(c) HAVING
(d) GROUPBY
Answer:
(d) GROUPBY

Question 7.
Which clause is used to sort the result set in ascending or descending order in SQL?
(a) WHERE
(b) DISTINCT
(c) ORDERBY
(d) HAVING
Answer:
(c) ORDERBY

Question 8.
Which clause is used to filter data based on the group function in SQL?
(a) HAVING
(b) WHERE
(c) DISTINCT
(d) GROUPBY
Answer:
(a) HAVING

Question 9.
Which clause can be combined with AND, OR, NOT operators in SQL?
(a) HAVING
(b) WHERE
(c) DISTINCT
(d) GROUPBY
Answer:
(b) WHERE

Question 10.
Which function returns 0 if there were no matching rows in SQL?
(a) COUNT ( )
(b) SUM( )
(c) MIN ( )
(d) MAX ( )
Answer:
(a) COUNT ( )

Question 11.
Match the following:

(i) DISTINCT	A. Summary rows
(ii) GROUP BY	B. Sort data
(iii) ORDER BY	C. Filter data
(iv) HAVING	D. Avoid duplicate

(a) (i) – D, (ii) – A, (iii) – B, (iv) – C
(b) (i) – D, (ii) – C, (iii) – B, (iv) – A
(c) (i) – C, (ii) – B, (iii) – A, (iv) – D
(d) (i) – C, (ii) – A, (iii) – D, (iv) – B
Answer:
(a) (i) – D, (ii) – A, (iii) – B, (iv) – C

Question 12.
Match the following:

(i) COUNT ( )	A. Find the sum
(ii) SUM ( )	B. returns number of rows
(iii) MIN ( )	C. Find the mean
(iv) AUG ( )	D. Smallest value

(a) (i) – B, (ii) – C, (iii) – D, (iv) – A
(b) (i) – B, (ii) – A, (iii) – D, (iv) – C
(c) (i) – D, (ii) – C, (iii) – B, (iv) – A
(d) (i) – D, (ii) – B, (iii) – A, (iv) – C
Answer:
(b) (i) – B, (ii) – A, (iii) – D, (iv) – C

Question 13.
Choose the incorrect pair:
(a) SQL – database
(b) SQLite – Relation database
(c) Commit – Delete the record
(d) INSERT – Populate
Answer:
(c) Commit – Delete the record

Question 14.
Choose the correct pair:
(a) SELECT – Query
(b) fetchall – Select Rows
(c) fetchone – Next number of rows
(d) fetchmany – Next row
Answer:
(a) SELECT – Query

Question 15.
Choose the incorrect statement.
(a) A database is an organized collection of data.
(b) The database management system is a software application.
(c) Python program cannot be interact as a user of an SQL database.
(d) SQLite is a simple Relational database system.
Answer:
(c) Python program cannot be interact as a user of an SQL database.

Question 16.
Choose the correct statement.
(a) sqlite master is a database.
(b) The path of a file can be either represented as ‘/’ or ‘\\’ in python.
(c) Count ( ) function returns the number of Column in a table.
(d) HAVING clause is used to store the data.
Answer:
(b) The path of a file can be either represented as ‘/’ or ‘\\’ in python.

Question 17.
Assertion (A):
SELECT is the most commonly used statement in SQL.
Reason (R):
HAVING clause is used to filter data based on the group functions.
(a) Both A and R are true and R is the correct explanation for A.
(b) Both A and R are true but R is the not correct explanation for A.
(c) A is true But R is false.
(d) A is false But R is true.
Answer:
(b) Both A and R are true but R is the not correct explanation for A.

Question 18.
Assertion (A):
Aggregate function are used to do operations from the values of the column and a single value is returned.
Reason (R):
SUM ( ) function retrieves the largest value of the selected rows.
(a) Both A and R are true and R is the correct explanation for A.
(b) Both A and R are true but R is the not correct explanation for A.
(c) A is true But R is false.
(d) A is false But R is true.
Answer:
(c) A is true But R is false.

Question 19.
Assertion (A):
The cursor object is created by calling the cursor ( ) method of connection.
Reason (R):
The cursor is used to traverse the records from the result set.
(a) Both A and R are true and R is the correct explanation for A.
(b) Both A and R are true but R is the not correct explanation for A.
(c) A is true But R is false.
(d) A is false But R is true.
Answer:
(a) Both A and R are true and R is the correct explanation for A.

Question 20.
Pick the odd one out.
(a) DISTINCT
(b) SUM
(c) WHERE
(d) HAVING
Answer:
(b) SUM

Question 21.
Which is SQLite is used create a connection with a database file created?
(a) Cursor ( )
(b) connect ( )
(c) execute ( )
(d) lite ( )
Answer:
(b) connect ( )

Question 22.
The WHERE clause cannot be combined with:
(a) XOR
(b) AND
(c) OR
(d) NOT
Answer:
(a) XOR

Question 23.
Which values cannot be counted?
(a) Integer
(b) String
(c) Character
(d) NULL
Answer:
(d) NULL

Question 24.
Carsor.description will be stored as a
(a) list
(b) tuple
(c) set
(d) dictionary
Answer:
(b) tuple

Question 25.
The table’s field names can be displayed using:
(a) cursor.description
(b) cursor, connect
(c) cursor.commit
(d) cursor, execute
Answer:
(a) cursor.description

Question 26.
__________ is a simple relational database system.
(a) python
(b) cython
(c) SQLite
(d) MySQL
Answer:
(c) SQLite

Question 27.
What program can interact as a user of a SQL database?
(a) C++
(b) C
(c) java
(d) Python
Answer:
(d) Python

Question 28.
Which method run the SQL command to perform some action?
(a) cursor ( )
(b) execute ( )
(c) connect ( )
(d) lite ( )
Answer:
(b) execute ( )

Question 29.
Count ( ) returns ___________ if there were no matching tows.
(a) NULL
(b) NOT NULL
(c) 0
(d) 1
Answer:
(c) 0

Question 30.
Which of the python native library?
(a) SQLite
(b) Oracle
(c) MySQL
(d) Foxpro
Answer:
(a) SQLite

Question 31.
Which of the following is MI organized collection of data?
(a) Database
(b) DBMS
(c) Information
(d) Records
Answer:
(a) Database

Question 32.
SQLite falls under which database system?
(a) Flat file database system
(b) Relational Database system
(c) Hierarchical database system
(d) Object oriented Database system
Answer:
(b) Relational Database system

Question 33.
Which of the following is a control structure used to traverse and fetch the records of the database?
(a) Pointer
(b) Key
(c) Cursor
(d) Insertion point
Answer:
(c) Cursor

Question 34.
Any changes made in the values of the record should be saved by the command:
(a) Save
(b) Save As
(c) Commit
(d) Oblige
Answer:
(c) Commit

Question 35.
Which of the following executes the SQL command to perform some action?
(a) Execute( )
(b) Key( )
(c) Cursor( )
(d) run( )
Answer:
(c) Cursor( )

Question 36.
Which of the following function retrieves the average of a selected column of rows in a table?
(a) Add( )
(b) SUM( )
(c) AVG( )
(d) AVERAGE( )
Answer:
(c) AVG( )

Question 37.
The function that returns the largest value of the selected column is:
(a) MAX( )
(b) LARGE( )
(c) HIGH( )
(d) MAXIMUM( )
Answer:
(a) MAX( )

Question 38.
Which of the following is called the master table?
(a) sqlite_master
(b) sql master
(c) main_master
(d) master_main
Answer:
(a) sqlite_master

Question 39.
The most commonly used statement in SQL is:
(a) cursor
(b) select
(c) execute
(d) commit
Answer:
(b) select

Question 40.
Which of the following clause avoid the duplicate?
(a) Distinct
(b) Remove
(c) Where
(d) GroupBy
Answer:
(a) Distinct

Category: Important Questions

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TN State Board 12th Computer Science Important Questions Chapter 15 Data Manipulation Through SQL