L 1 Computer System / Class-3

Computer Science

Class-III

Lesson-1 Computer System

Q1) Make a list of full form

a)    VDU :Visual Display Unit

b)    CRT :Cathode Rays Tube

c)     LCD :Liquid Crystal Display

d)    CPU : Central Processing Unit

e)    MU : Memory unit

f)     CU : Control Unit

g)    ALU : Arithmetic logic unit

h)   IPO: Input Process output

 

A. Fill in the blanks :

{ Hints : Monitor, Data, Mouse, VDU, CPU, 3 }

1. Computer works with data _ given by user.

2. A _Monitor displays work done on a computer.

3. A monitor is also known as VDU .

4. Mouse  is a pointing device.

5. CPU is made up of _3 (three)  parts.

6. CPU  does all the calculation and display result on monitor.

 

B. Guess! Who am I?

1. I accept data from the user Input

2. I give the result as output  Output

3. I am a part of CPU and do arithmetic calculation _ALU

4. I am doing all kind of calculation ALU.

B. Expand them.

1. VDU à Visual Display Unit

2. CRT à Cathode Rays Tube

3. LCD à Liquid Crystal Display

4. MU à Memory unit

5. CU à Control Unit

6. ALU à Arithmetic logic unit

D. Tick (ü) the correct option.

1. A computer displays ___________ after processing the data.

a) Input                                           b)Output                               c) process

Ans- b)Output

2. ___________ control, all the parts of computer system.

a) CU                                              b)MU                                     c) ALU

Ans- a) CU

3. A computer is an _____________ machine.

a) Slow                                           b)Dump                                c) Electronic

Ans- c) Electronic

4. _____________ accepts the data given by user.

a)output device                            b) input device                   c) Processing device

Ans- b) input device

E. Answer them.

1. What is a computer?

Ans-Computer is an electronic device which takes input data, process it then give output in the form of hard copy and soft copy.

 

2. Which part of a computer shows the output?

Ans- Output device i.e. monitor, speaker, etc

 

3. Name the device which is known as the brain of a computer.

Ans – CPU is the brain of computer

 

4. Write the full form of IPO.

Ans- Input Process Output

 

5. Name the three parts of CPU

Ans-- A CPU is made up of three main parts: - MU, CU, and ALU.