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IGCSE CS Chapter 1 - 3 Theory

Total questions: 85

Worksheet time: 28mins

Name
Class
Date
1.

Which numbering system is used in computers?

a)

Binary

b)

Decimal

c)

Octal

d)

Hexadecimal

2.

What is the base of the hexadecimal system?

a)

2

b)

8

c)

10

d)

16

3.

Which bit is the most significant in a binary number?

a)

Rightmost

b)

Leftmost

c)

Middle

d)

None

4.

What is the decimal equivalent of hexadecimal 'A'?

a)

8

b)

9

c)

10

d)

11

5.

How do you convert binary to decimal?

a)

Divide by 2

b)

Multiply by 2

c)

Use powers of 2

d)

Subtract 2

6.

What is the largest value that can be stored in 4 bits?

a)

7

b)

8

c)

15

d)

16

7.

Which of the following is a method of binary addition?

a)

Decimal Expansion

b)

Bitwise Addition

c)

Carry Method

d)

Hex Shift

8.

What is overflow in binary addition?

a)

Losing excess bits

b)

Having extra bits

c)

Using all bits

d)

Skipping bits

9.

Which of the following uses hexadecimal?

a)

IPV4 Addresses

b)

ASCII

c)

MAC Addresses

d)

RGB Colors

10.

What does ASCII stand for?

a)

American System for Code Interchange

b)

American Standard Code for Information Interchange

c)

Automated System for Computer Input

d)

Advanced System for Character Interface

11.

Which character encoding supports multiple languages?

a)

ASCII

b)

EBCDIC

c)

Unicode

d)

Morse Code

12.

How is sound stored in a computer?

a)

Decimal Values

b)

Binary Representation

c)

Analog Waves

d)

Hexadecimal Codes

13.

What determines the quality of digital sound?

a)

Sample Rate

b)

Pixel Density

c)

Resolution

d)

Bit Depth

14.

Which unit is used to measure sampling rate?

a)

Hertz

b)

Bytes

c)

Pixels

d)

Decibels

15.

What is a pixel?

a)

A storage unit

b)

A sound sample

c)

A single point in an image

d)

A code unit

16.

What is color depth?

a)

The size of an image

b)

Number of colors per pixel

c)

The resolution of an image

d)

The contrast level

17.

Which file format is lossless?

a)

JPEG

b)

MP3

c)

PNG

d)

GIF

18.

Which transmission mode allows two-way communication simultaneously?

a)

Simplex

b)

Half-duplex

c)

Full-duplex

d)

Parallel

19.

Which data transmission type sends one bit at a time?

a)

Serial

b)

Parallel

c)

Full-duplex

d)

Half-duplex

20.

What is a parity bit used for?

a)

Encrypting data

b)

Error detection

c)

Increasing speed

d)

Reducing memory usage

21.

What does USB stand for?

a)

Universal System Bus

b)

Universal Serial Bus

c)

Unique Standard Bus

d)

Uniform Secure Buffer

22.

What is the purpose of encryption?

a)

Reduce file size

b)

Speed up transmission

c)

Protect data

d)

Increase bandwidth

23.

Which encryption method uses a public and private key?

a)

Symmetric

b)

Asymmetric

c)

Bitwise

d)

Hashing

24.

What does the CPU do?

a)

Stores files

b)

Executes instructions

c)

Manages internet access

d)

Processes graphics

25.

Which part of the CPU performs arithmetic calculations?

a)

Control Unit

b)

Cache Memory

c)

Arithmetic Logic Unit

d)

Bus

26.

Which CPU register holds the address of the next instruction?

a)

MAR

b)

MDR

c)

CIR

d)

PC

27.

What type of memory is volatile?

a)

ROM

b)

RAM

c)

Flash

d)

Hard Drive

28.

What is the function of cache memory?

a)

Store frequently accessed data

b)

Store all system files

c)

Execute software

d)

Control input/output

29.

Which of the following is secondary storage?

a)

RAM

b)

SSD

c)

Cache

d)

Registers

30.

What does OCR stand for?

a)

Optical Character Recognition

b)

Online Code Reader

c)

Object Classification Registry

d)

Optimal Cache Retrieval

31.

Which of the following is an input device?

a)

Monitor

b)

Printer

c)

Keyboard

d)

Speaker

32.

What is a MAC address used for?

a)

Encrypting data

b)

Identifying devices on a network

c)

Accessing cloud storage

d)

Running software

33.

Which IP version provides more unique addresses?

a)

IPv4

b)

IPv5

c)

IPv6

d)

IPv8

34.

Which device connects multiple networks?

a)

Switch

b)

Router

c)

Hub

d)

Repeater

35.

Which protocol is used for secure web browsing?

a)

HTTP

b)

FTP

c)

SMTP

d)

HTTPS

36.

What is malware?

a)

A security tool

b)

A type of virus

c)

A network protocol

d)

A storage format

37.

What is the main function of a firewall?

a)

Boost internet speed

b)

Protect against unauthorized access

c)

Store IP addresses

d)

Manage memory

38.

Which network type covers the largest area?

a)

LAN

b)

WAN

c)

MAN

d)

PAN

39.

What is a VPN used for?

a)

Secure remote access

b)

Speed up networks

c)

Store user passwords

d)

Manage firewall rules

40.

Which file type is used for video storage?

a)

MP3

b)

JPEG

c)

MP4

d)

PNG

41.

What is a register in a CPU?

a)

A temporary storage location

b)

A type of RAM

c)

A component of a hard drive

d)

A network device

42.

What does a heat sink do?

a)

Stores electricity

b)

Cools the CPU

c)

Increases power supply

d)

Improves bandwidth

43.

Which memory type is fastest?

a)

RAM

b)

HDD

c)

Cache

d)

SSD

44.

What is phishing?

a)

A type of malware

b)

A social engineering attack

c)

A security firewall

d)

A data backup tool

45.

What is a disadvantage of using a wireless network?

a)

Requires more cables

b)

Slower than wired networks

c)

More difficult to install

d)

More expensive

46.

What is an advantage of cloud storage?

a)

Files can be accessed anywhere

b)

Requires no internet

c)

Does not require passwords

d)

Only works on one device

47.

What is the base of the binary number system?

a)

2

b)

8

c)

10

d)

16

48.

What does MSB stand for in binary representation?

a)

Most Significant Bit

b)

Multiple Storage Byte

c)

Main Source Binary

d)

Memory System Base

49.

Which number system has values ranging from 0 to 9 and A to F?

a)

Binary

b)

Hexadecimal

c)

Octal

d)

Denary

50.

What is the decimal equivalent of binary 1010?

a)

8

b)

9

c)

10

d)

11

51.
Which of the following is NOT a step in converting binary to decimal?
a)
Multiply by powers of 2
b)
Add all results together
c)
Divide by 2 repeatedly
d)
Start from the rightmost bit
52.
What is the process of converting a denary number to binary called?
a)
Binary Encoding
b)
Binary Conversion
c)
Binary Decomposition
d)
Binary Expansion
53.
Which method is used to represent negative numbers in binary?
a)
One's Complement
b)
Two's Complement
c)
Floating Point Representation
d)
Exponential Representation
54.
What happens when the result of a binary addition exceeds the number of bits available?
a)
Underflow
b)
Bit Shift
c)
Overflow
d)
Carry Forward
55.
What is the primary purpose of the hexadecimal number system in computing?
a)
Perform calculations faster
b)
Reduce storage size
c)
Make binary representation more readable
d)
Improve processing speed
56.
How many bits are there in one byte?
a)
4
b)
8
c)
16
d)
32
57.
What does ASCII stand for?
a)
American Standard Code for International Interfacing
b)
American Standard Code for Information Interchange
c)
Advanced Systematic Coding for Integrated Information
d)
Automated System for Character Input
58.
What is the bit size of an ASCII character?
a)
6-bit
b)
7-bit
c)
8-bit
d)
16-bit
59.
Which of the following is NOT an application of hexadecimal?
a)
MAC addresses
b)
Memory Addresses
c)
IPV4 Addresses
d)
Debugging
60.
How is sound stored in a computer?
a)
Analogue Waves
b)
Binary Representation
c)
Hexadecimal Encoding
d)
Decimal Approximation
61.
What does the sampling rate in digital sound refer to?
a)
The amount of data stored
b)
The number of sound samples taken per second
c)
The pitch of the sound
d)
The frequency of binary conversion
62.
What is the function of a pixel in an image?
a)
It determines the color depth
b)
It represents a single point in a digital image
c)
It is used to compress images
d)
It is a unit of file storage
63.
What happens when color depth is increased?
a)
The image quality decreases
b)
The file size increases
c)
The resolution decreases
d)
The image becomes grayscale
64.
Which of the following best defines resolution in digital images?
a)
Number of pixels in the image
b)
Size of the file
c)
Number of colors available
d)
Brightness of the image
65.
Which file type uses lossless compression?
a)
MP3
b)
JPEG
c)
PNG
d)
MP4
66.
Which transmission type allows data flow in only one direction?
a)
Simplex
b)
Half-duplex
c)
Full-duplex
d)
Parallel
67.
What is the advantage of serial data transmission?
a)
It is faster
b)
It is better for long distances
c)
It requires more cables
d)
It is easier to synchronize
68.
What is the purpose of parity checks?
a)
To increase data speed
b)
To correct errors
c)
To detect errors
d)
To compress data
69.
What does USB stand for?
a)
Universal System Bus
b)
Uniform Serial Buffer
c)
Universal Serial Bus
d)
Unique Signal Bus
70.
Which of the following is NOT a type of data transmission?
a)
Simplex
b)
Parallel
c)
Half-duplex
d)
Multiplex
71.
What is encryption used for?
a)
Compressing files
b)
Encoding text in ASCII
c)
Protecting data from unauthorized access
d)
Improving processing speed
72.
Which encryption method uses both a public and private key?
a)
Symmetric
b)
Asymmetric
c)
Bitwise
d)
Hashing
73.
What does the CPU do?
a)
Stores long-term data
b)
Processes instructions
c)
Manages the operating system
d)
Controls display output
74.
Which part of the CPU performs calculations?
a)
Control Unit
b)
Arithmetic Logic Unit
c)
Cache Memory
d)
Register
75.
What is the function of the Control Unit in the CPU?
a)
Performs calculations
b)
Executes program instructions
c)
Controls all CPU operations
d)
Stores frequently used data
76.
What type of memory is volatile?
a)
ROM
b)
Flash Memory
c)
RAM
d)
Cache
77.
What is the purpose of cache memory?
a)
To store frequently used data for quick access
b)
To store the BIOS
c)
To store user files
d)
To manage RAM
78.
Which of the following is secondary storage?
a)
RAM
b)
CPU Registers
c)
Hard Drive
d)
Cache Memory
79.
What is a disadvantage of SSD compared to HDD?
a)
Slower access time
b)
Lower storage capacity
c)
Higher failure rate
d)
More moving parts
80.
Which device is used to capture digital images?
a)
Scanner
b)
Printer
c)
Monitor
d)
Speaker
81.
Which technology is commonly used in modern touchscreens?
a)
Resistive
b)
Capacitive
c)
Optical
d)
Mechanical
82.
What is a MAC address used for?
a)
To identify network devices
b)
To encrypt files
c)
To access cloud storage
d)
To store memory addresses
83.
Which IP version provides more unique addresses?
a)
IPv4
b)
IPv6
c)
IPv7
d)
IPv8
84.
What is an advantage of cloud storage?
a)
It requires expensive hardware
b)
It is accessible from anywhere
c)
It has unlimited storage
d)
It does not need internet access
85.
Which storage device is fastest?
a)
HDD
b)
SSD
c)
CD
d)
USB Flash Drive

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