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1

Which four number systems are most important in computing?

Medium 2 Marks

Focus on the actual number systems used by computers not encoding standards.

A Decimal Roman Octal Binary

B Decimal Binary Octal Hexadecimal

C Binary Hexadecimal ASCII Unicode

D Decimal Binary Octal ASCII

2

In decimal number 345 what is the positional value of the digit 3?

Medium 2 Marks

Each position in decimal represents a power of 10.

A 3

B 30

C 300

D 3000

3

What is the decimal equivalent of binary 1011?

Medium 2 Marks

Multiply each bit by its corresponding power of 2 from right to left.

A 9

B 10

C 11

D 13

4

Why are octal numbers useful in computing?

Medium 2 Marks

Why would a shorter representation of binary be useful?

A They are easier for humans to read than decimal

B One octal digit corresponds to exactly three binary digits providing compact notation

C They are used to represent colours in web design

D They are the native language of all modern processors

5

What is the decimal equivalent of octal 17?

Medium 2 Marks

Multiply each octal digit by its corresponding power of 8.

A 13

B 14

C 15

D 17

6

Which symbols does hexadecimal use?

Medium 2 Marks

After digit 9 hexadecimal continues with letters.

A 0-9 only

B 0-7 and A-F

C 0-9 and A-F

D 0-9 and a-z

7

What is the decimal value of hexadecimal digit B?

Medium 2 Marks

Count from A=10 upward to find B.

A 10

B 11

C 12

D 13

8

Which of these is NOT a use of hexadecimal?

Medium 2 Marks

Think about where hex notation actually appears in computing contexts.

A Computer programming

B Memory addressing

C Web colour codes

D Measuring file sizes in bytes

9

What is the result of binary addition 101 + 011?

Medium 2 Marks

Apply binary addition rules column by column from right to left.

A 110

B 111

C 1000

D 1001

10

In binary subtraction what happens when you compute 0 - 1?

Medium 2 Marks

What do you do in decimal subtraction when a column digit is too small?

A Result is 0

B Result is -1

C You borrow from the next higher digit

D The operation is undefined

11

Binary subtraction is used in which component of the CPU?

Medium 2 Marks

Which part of the CPU performs all arithmetic and logic operations?

A Monitor control unit

B Hard disk controller

C Arithmetic Logic Unit (ALU)

D Network interface card

12

What is the correct hierarchy from smallest to largest data unit?

Medium 2 Marks

Start from the smallest piece of data and work upward.

A Byte Bit KB MB GB TB

B Bit Byte KB MB GB TB

C KB MB GB TB Bit Byte

D Bit KB Byte MB GB TB

13

A Terabyte (TB) is equal to approximately:

Medium 2 Marks

TB is the next step up from GB in the data unit hierarchy.

A 1024 KB

B 1024 MB

C 1024 GB

D 1024 TB

14

How many bits does ASCII use per character?

Medium 2 Marks

7 bits gives 2 to the power 7 = 128 possible character combinations.

A 4 bits

B 7 bits

C 8 bits

D 16 bits

15

How many characters can ASCII represent in total?

Medium 2 Marks

Calculate 2 to the power of the number of bits ASCII uses.

A 64

B 128

C 256

D 65536

16

What is the ASCII value of the uppercase letter A?

Medium 2 Marks

ASCII values for uppercase English letters begin at 65.

A 48

B 65

C 97

D 255

17

What is the main limitation of ASCII?

Medium 2 Marks

ASCII was developed in America — which language does that suggest it focuses on?

A It uses too many bits per character

B It cannot represent numbers

C It only supports English and cannot represent other language characters

D It is incompatible with modern computers

18

What is the most widely used Unicode encoding today?

Medium 2 Marks

This is the default encoding for most websites and modern applications.

A ASCII-8

B UTF-8

C UTF-16

D Unicode-32

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