CLASS 9 COMPUTER SYSTEM 5/4/2025

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                                             Class IX

                                Computer System (chap-1)


1. Computer- A computer is an electronic device that can

perform a variety of operations according to a set of

instructions called program.

2. Hardware- Hardware refers to physical parts of the

computer that can be touched physically.

3. Software- Software refers to the instructions that tell the

computer what to do.

4. Data- Unprocessed raw facts and figures are data e.g., a

name (Ram), some marks (72.5%), a year (2020) etc. are

data.

5. Information- It refers to the processed data that is

meaningful e.g., above data can be converted into

information as “Ram, who passed in 2020, secured 72.5%

marks.”

6. Functional components of a computer system

A computer, mainly, has four functions

1. Accepts data- Input

2. Processes data- Processing

3. Produces Result/Output- Output

4. Stores Results- Storage




Q1. Multiple choice questions:-

a. The physical components of the computer system are called

i) Software ii) Hardware iii) Firmware

b. Which one is the device that is the ‘brain’ of a computer

system?

i) CPU ii) Motherboard iii) Scanner

c. Out of these which one is a volatile memory?

i) ROM ii) RAM iii) Floppy

d. A byte consists of ............... bits.

i) 2 ii) 4 iii) 8

e. The smallest unit of data in a computer is..............

i) Bit ii) Byte iii) nibble

f. 1 Gigabyte (GB)=................MB

i) 100 ii) 1000 iii) 1024

g. Unprocessed raw facts and figures are known as

i) Information ii) Storage iii) Data

h. Set of instructions given to computers are called a ........

i) Program ii) Data iii) Icon

Q2. Fill in the blanks:-

a. Computers have ...ZERO.....IQ.

b. ...Supercomputer..is the most powerful computer.

c. Data are the raw facts from which information are derived.

d. ALU stands for...Arithmetic logic Unit.

e. The processed and meaningful form of data is called

Information.

Q3. What are the major strengths and weaknesses of

computer?


Ans3- Strengths-

1. Speed 2. Accuracy 3. Reliability 4. Versatility

5. High storage capacity

Q4. What is computer program?

Ans4- A computer program is a set of instructions given to

computer to perform some operations.


Q5. Which type of computer provides a user with mobility as

well as essentially the same processing capabilities as a

desktop personal computer?

Ans5. Laptop computers or notebooks provide user mobility as

well as essentially the same processing capabilities as a

desktop personal computer.


Q6. Which of the following are parts of computer i.e.

hardware and software? CPU, control unit, query, English,

training, formula, ALU, processor, memory, operating system,

windows XP

ANSWER-

Hardware- CPU, control unit, ALU, Processor, Memory

Software- Operating system, windows XP, Query

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