Computer-Science-Class-6 Chapter-1(2024-25):

Computer Science

Class-6

Chapter-1 Computer System

A. Tick the correct option.

1. Which of the following is not an input device?
a. Mouse        b. Keyboard           c. Monitor    d. None of these
Answer: Monitor

2. The arrow showing the position of mouse on screen is known as _______.
a. Cursor        b. Mouse buttons  c. Mouse pointer    d. None of these
Answer: Mouse pointer

3. Which of the following device is to accept audio inputs from the user?
a. Joystick    b. Scanner        c. Microphone        d. Speakers
Answer: Microphone

4. The storage capacity  of a CD is around______ MB.
a. 680-700    b. 640-750        c.640-680            d.640-700

Answer: 680-700

5. Which of these is the temporary memory of a computer?
a. ALU            b. RAM            c. CPU                   d. ROM

Answer: RAM

B. Write true or false for the following statements.
1. Scanner is used for playing games on the computer.
Answer: F

2. The arrow showing the position of mouse on screen is called mouse pointer.
Answer: T

3. Graphic tablet is used to accept audio inputs from the user.
Answer: F

4. Web camera needs internet connection in order to function.
Answer: T

5. ROM is a volatile memory because its contents are accessible only as long as the computer is on.
Answer: F

6. The storage capacity of DVD is 700 MB.
Answer: F

7. Laser printer produces high quality output at a high speed.
Answer: T

C. Fill in the blanks:
1. A _______ is a pointing device consisting of a plastic stick mounted on a base.

Answer: Joystick
2. Microphone contains a device called_____ inside it.
Answer: Amplifier

3. The main circuit board of a computer which lies inside the CPU box is known as the __________.
Answer: Motherboard

4. Secondary storage is also known as __________.
Answer: External memory

5. DVD stands for________________.
Answer: Digital Video Disc

D. Answer the following questions.
1. What are input devices? Name some input devices?
Answer: Those devices of computer that takes instructions from user are called input devices. Example: Keyboard, Mouse, Scanner, Joystick, OMR.

2. Describe different keys of the keyboard?
Answer: There are different types of keyboard keys:

1. Alphanumeric keys

2. Control keys

3. Functions keys

4. Numeric keys

5. Spacebar keys

6. Special keys

3. How does CPU function?
Answer: CPU functions through two parts:

1. Arithmetic logic unit: The ALU is an integrated circuit within a CPU that performs arithmetic's and logic functions.

2. Control Unit: The CU controls the flow of binary data in the computer.

4. What is the main difference between RAM and ROM?
Answer: RAM(Random Access Memory) is the central storage unit in a computer system. RAM is also called the Read/Write memory. It is said to be volatile memory.

ROM(Read Only Memory) is a special type of built in memory which can only be read and contents off.

5. What are output devices?

Answer: All those devices of computer that gives result are called output devices. Example: Monitor, Printer, Speaker, Plotter etc.