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1

Why do computers use the binary number system?

Easy 1 Mark

What are the only two states a computer circuit can be in?

A Because binary is easier for humans to understand

B Because computers can only recognise two electrical states ON and OFF

C Because binary numbers are always larger than decimal

D Because binary requires less electricity

2

Everything inside a computer is ultimately stored as:

Easy 1 Mark

What is the most basic language all computers understand?

A Decimal numbers

B Hexadecimal codes

C Binary form (0s and 1s)

D ASCII text only

3

What is a number system?

Easy 1 Mark

Think about how different systems use different sets of symbols to count.

A A method to represent numbers using a specific set of digits or symbols

B A type of computer memory

C A programming language

D A unit of data storage

4

What determines the number of digits used in a number system?

Easy 1 Mark

Base 2 uses 2 digits base 10 uses 10 — what property defines this?

A The speed of the computer

B The base or radix of the number system

C The memory size of the computer

D The operating system installed

5

What is the base of the decimal number system?

Easy 1 Mark

Count how many different digits decimal uses.

A Base 2

B Base 8

C Base 10

D Base 16

6

Which digits are used in the decimal number system?

Easy 1 Mark

This is the everyday counting system humans use.

A 0 and 1 only

B 0 to 7

C 0 to 9

D 0 to 15

7

What is the base of the binary number system?

Easy 1 Mark

Binary means two — how many digits does it use?

A Base 2

B Base 8

C Base 10

D Base 16

8

What does binary digit 1 represent electrically?

Easy 1 Mark

Think of a light switch — 1 means the circuit is on.

A OFF state

B Neutral state

C ON state

D Unknown state

9

What is the base of the octal number system?

Easy 1 Mark

Octal comes from the Latin word for eight.

A Base 2

B Base 8

C Base 10

D Base 16

10

Which digits are used in the octal number system?

Easy 1 Mark

The base tells you the highest digit allowed — base 8 goes up to 7.

A 0 and 1 only

B 0 to 7

C 0 to 9

D 0 to 15

11

What is the base of the hexadecimal number system?

Easy 1 Mark

Hex = 6 deci = 10 — add them to get the base.

A Base 2

B Base 8

C Base 10

D Base 16

12

What is the decimal value of hexadecimal digit F?

Easy 1 Mark

Start from A=10 and count up to find the value of F.

A 6

B 14

C 15

D 16

13

What is the result of binary addition 1 + 1?

Easy 1 Mark

Think of it like decimal 9+1 — write 0 and carry 1.

A 1

B 2

C 10

D 11

14

What is the result of binary addition 0 + 1?

Easy 1 Mark

Binary 0+1 follows the same rule as decimal 0+1.

A 0

B 1

C 10

D 11

15

Binary addition is used in computer processors for:

Easy 1 Mark

Which component of the CPU handles all arithmetic operations?

A Storing files on a hard disk

B Displaying colours on screen

C Performing arithmetic calculations

D Sending data over a network

16

What is the result of 1 - 1 in binary subtraction?

Easy 1 Mark

Same as decimal — any number minus itself equals zero.

A 1

B 0

C 10

D 11

17

What is the result of 1 × 1 in binary multiplication?

Easy 1 Mark

Binary multiplication rules are simpler than decimal — only four rules exist.

A 0

B 1

C 10

D 11

18

What is 1 × 0 in binary multiplication?

Easy 1 Mark

Multiplying by zero always gives zero in any number system.

A 1

B 0

C 10

D Undefined

19

What is a bit?

Easy 1 Mark

Bit stands for Binary digIT — the smallest possible piece of data.

A A group of 8 bytes

B The smallest unit of data with value 0 or 1

C A unit equal to 1024 bytes

D A type of storage device

20

How many bits make one byte?

Easy 1 Mark

This is one of the most fundamental facts in computing.

A 4 bits

B 6 bits

C 8 bits

D 16 bits

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