(Grade IX) Chapter 1 - Introduction to Computer System (Part 1- Introduction to Computer)

 

 Exercise- Page number 12

 1. Give the full forms of following:

i. CPU – Central Processing Unit
ii. RAM – Random Access Memory
iii. CBIS – Computer-Based Information System
iv. GIGO – Garbage In, Garbage Out
v. CD – Compact Disc
vi. DVD – Digital Versatile Disc (or Digital Video Disc)
vii. KB – Kilobyte
viii. MB – Megabyte
ix. GB – Gigabyte
x. EB – Exabyte
xi. CBE – Competency-Based Education
xii. CAD – Computer-Aided Design

 

2. Multiple Choice Questions:

i.The word computer is derived from the Latin word

a.      Calculator

b.     Compare

c.      Compatible

d.     Computare

 

ii. Which unit of time is equal to one billionth of a second

a.      millisecond

b.     microsecond

c.      Nanosecond

d.     d.picosecond

 

iii. When the input is wrong, then the output will also be wrong, it is termed as

a.      FIFO

b.     LIFO

c.      GIGO

d.     BUG

 

iv. Repeatedly working capability of a computer is known as

a.      speed

b.     storage

c.      Diligence

d.     versatility

v. What is the most crucial component of a computer system, often referred to as the "brain"?

a.      Monitor

b.     keyboard

c.      CPU

d.     Mouse

 

vi. Which of the following is NOT a key characteristic of computers?

a.      Speed

b.     Accuracy

c.      Intelligence

d.     Diligence

 

vii. In which area of application are computers not commonly used?

a.      Health care

b.     Education

c.      Entertainment

d.     Traditional Craftsmanship

 

3. Give appropriate technical terms for the following:

a. A combination of hardware and software to perform tasks.

Computer System

 

b. An electronic device that processes and stores information according to a set of instructions

Computer

 

c. Terminology which describe that incorrect input data will always lead to incorrect output.

GIGO (Garbage In, Garbage Out)

 

d. Feature of computer which shows that computers can be used for a wide range of tasks.

Versatility

 

e. The ability to perform tasks or processes automatically, without human intervention.

Automation

 

f. Data and instruction entered into computer.

Input

 

g. Meaningful information displaced from the computer.

Output

 

h. Ability of computer to store data and information for future use.

Storage

 

4. Short Answer Questions:

a. Define a computer in your own words.
A computer is a machine that takes input, processes it, and gives output.

 b. List four key characteristics of computers.
Speed, accuracy, versatility and diligence.

 c. Give an example of how computers are used in healthcare.
Computers help doctors check patient records and run medical tests.

 d. How has the use of computers impacted education?
Computers make learning easy through online classes and digital books.

 e. Why is a computer called a diligence machine? What is GIGO?
A computer never gets tired, so it's called diligent.
GIGO means wrong input gives wrong output – "Garbage In, Garbage Out."

 f. Explain the working principles of a computer with a block diagram.
A computer works in three steps: input, process, and output.

Block Diagram:

g. Convert as indicated:
i. 23 MB = 23 × 1024 = 23,552 KB
ii. 620 KB = 620 × 1024 = 634,880 bytes

  

Conversion Table

1 KB = 1024 bytes

1 MB = 1024 KB

1 GB = 1024 MB

1 TB = 1024 GB

 

Rule:
Larger → Smaller = Multiply by 1024
Smaller → Larger = Divide by 1024

 

i. 4096 KB to MB
4096 KB = 4096 ÷ 1024
= 4 MB

 

ii. 620 KB to bytes
620 KB = 620 × 1024
= 634,880 bytes

 

iii. 1048576 KB to GB

1048576 ÷ 1024 ÷ 1024
= 1 GB

 

iv. 2 TB to KB

 = 2 × 1024 × 1024 × 1024
= 2,147,483,648 KB

5. Long answer question

a.. Explain the functions of computer system with block diagram.

A digital computer system is made up of several parts that work together. These parts include the Input Unit, Central Processing Unit (CPU), Memory Unit, and Output Unit.

 

 

Input Unit:
It takes data and instructions from the user. Example: keyboard, mouse.

 

Central Processing Unit (CPU):
It is the brain of the computer. It has two parts:

 

Control Unit (CU): Controls all parts of the computer.

 

Arithmetic and Logic Unit (ALU): Does all calculations and decisions.

 

Memory Unit:
Stores data and instructions temporarily (RAM) or permanently (Hard drive).

 

Output Unit:
Shows the result to the user. Example: monitor, printer.

 

b. Explain any three application areas of the computer.

 

Education:
Computers are used in schools and colleges for learning, teaching, online classes, and preparing notes or presentations.

 

Healthcare:
Doctors use computers for keeping patient records, checking medical reports, and running machines like X-ray or ECG.

 

Banking:
Computers help in online transactions, ATM services, managing customer accounts, and keeping records safe and fast.