CLASS 3 REVISION

I. Choose the Correct Answer

1. Which of the following is an output device?
   a) Keyboard
   b) Mouse
   c) Monitor
   d) Scanner

   Answer: c) Monitor

2. Which device is used to type letters and numbers?
   a) Mouse
   b) Keyboard
   c) Printer
   d) Speaker

   Answer: b) Keyboard

3. Which of the following is a storage device?
   a) Hard Disk
   b) Monitor
   c) Mouse
   d) Speaker

   Answer: a) Hard Disk

4. Which key is used to move to a new line while typing?
   a) Shift Key
   b) Enter Key
   c) Spacebar
   d) Caps Lock

   Answer: b) Enter Key

5. Which device is used to print documents on paper?
   a) Scanner
   b) Printer
   c) Monitor
   d) Keyboard

   Answer: b) Printer

II. Fill in the Blanks

(Keyboard, Mouse, Output, Monitor, Hardware)

1. The physical parts of a computer are called __________.
   Answer: Hardware

2. A __________ is used to point and click on items on the screen.
   Answer: Mouse

3. A __________ is used to type text into the computer.
   Answer: Keyboard

4. The result given by a computer is called __________.
   Answer: Output

5. A __________ displays information on the screen.
   Answer: Monitor

III. True or False

1. A mouse is an input device.
   Answer: True

2. A printer is an output device.
   Answer: True

3. The monitor is used for typing.
   Answer: False

4. Hardware cannot be touched.
   Answer: False

5. Windows is an Operating System.
   Answer: True

IV. Match the Columns

1. Mouse → d. Pointing device

2. Printer → a. Prints documents

3. Monitor → e. Shows output

4. Keyboard → b. Used for typing

5. Hard Disk → c. Stores data

V. Answer the Following Questions

1. What is hardware?

   Answer: Hardware refers to the physical parts of a computer that can be seen and touched.

2. What is software?

   Answer: Software is a set of instructions that tells the computer what to do.

3. Name any two input devices.

   Answer: Keyboard and Mouse.

4. Name any two output devices.

   Answer: Monitor and Printer.

5. What is the function of a keyboard?

   Answer: A keyboard is used to enter data, letters, and numbers into the computer.

 

I. Choose the Correct Answer

1. Which of the following is an example of hardware?
   a) A game
   b) MS Paint
   c) A printer
   d) Windows

   Answer: c) A printer

2. The CPU is known as the ______ of the computer.
   a) Memory unit
   b) Output device
   c) Brain
   d) Storage unit

   Answer: c) Brain

3. What is the main function of an input device?
   a) To display the result
   b) To save data permanently
   c) To give data and instructions to the computer
   d) To process data

   Answer: c) To give data and instructions to the computer

4. Which part of the CPU performs all the calculations and comparisons?
   a) Control Unit (CU)
   b) Arithmetic and Logic Unit (ALU)
   c) Memory Unit
   d) IPO Cycle

   Answer: b) Arithmetic and Logic Unit (ALU)

5. A computer’s manager is a special software called the ______.
   a) Desktop
   b) Operating System
   c) Wallpaper
   d) Taskbar

   Answer: b) Operating System

6. The process of the Operating System loading into the computer’s memory is called ______.
   a) Shutdown
   b) Dragging
   c) Booting
   d) Clicking

   Answer: c) Booting

7. Which type of Operating System uses pictures, menus, and a mouse to work?
   a) CUI
   b) MS-DOS
   c) GUI
   d) Safe Mode

   Answer: c) GUI

8. The long, thin bar at the bottom of the Desktop is called the ______.
   a) Taskbar
   b) System Tray
   c) Scrollbar
   d) Start Menu

   Answer: a) Taskbar

II. Fill in the Blanks

(Software, Process, Control Unit, Permanently, Desktop, Interface, Icons, Start Button)

1. The part of the computer that we cannot touch is called __________.
   Answer: Software

2. The three main steps a computer uses to work are input, __________, and output.
   Answer: Process

3. The __________ is the manager of the computer, directing all the work.
   Answer: Control Unit

4. Secondary storage devices like a hard disk store our work __________.
   Answer: Permanently

5. The first screen you see after the computer finishes booting is called the __________.
   Answer: Desktop

6. The OS acts as an __________ between the user and the computer.
   Answer: Interface

7. The small pictures on the screen that represent files or programs are called __________.
   Answer: Icons

8. The __________ is found on the left side of the Taskbar.
   Answer: Start Button

III. True or False

1. The CPU is located inside the monitor.
   Answer: False

2. Software is the part of the computer that you can touch.
   Answer: False

3. The Operating System is not needed for a computer to work.
   Answer: False

4. MS-DOS is an example of a CUI.
   Answer: True

IV. Match the Columns

1. Keyboard → c. An input device

2. Hard disk → e. A secondary storage device

3. Control Unit → a. The manager of the computer

4. Monitor → b. Displays the result

5. Arithmetic and Logic Unit → d. Performs calculations

V. Answer the Following Questions

1. What is the IPO cycle?

   Answer: IPO stands for Input, Process, and Output. The computer takes data as input, processes it, and gives the result as output.

2. Why is the CPU called the “brain” of the computer?

   Answer: The CPU is called the brain of the computer because it controls all the activities and processes all data.

3. Name the three parts of the CPU and write one function of each.

   Answer:
   • Control Unit (CU) – Controls all computer operations.
   • Arithmetic and Logic Unit (ALU) – Performs calculations and comparisons.
   • Memory Unit (MU) – Stores data and instructions.

4. What is an Operating System (OS)?

   Answer: An Operating System is a software that manages the computer and helps the user communicate with it.

5. Define the term Booting.

   Answer: Booting is the process of starting a computer and loading the Operating System into memory.