IGCSE Computer Science Quiz

The binary system is based on:

• Base 8

• Base 2

• Base 10

• Base 16

Convert the denary number 45 to binary:

• 101101

• 101011

• 110011

• 100111

The hexadecimal representation of 255 is:

• FF

• 25

• 100

• EE

Convert binary 1011010 to denary:

• 90

• 58

• 72

• 45

Convert hexadecimal 3F to binary:

• 111111

• 101111

• 100111

• 111100

Add 01101101 + 10111010. What is the result?

• 100100111 (overflow)

• 100010111

• 111101111

• 011001111

Logical right shift by 2 bits on 11010011 gives:

• 11110100

• 00110100

• 00011011

• 11001001

In two’s complement (8-bit), −37 is represented as:

• 11011011

• 00101101

• 10101111

• 11100101

Which of the following is a binary subtraction of 1101 − 101?

• 1000

• 1010

• 1110

• 1001

A left shift by 1 bit in binary is equivalent to:

• Dividing by 2

• Multiplying by 2

• Dividing by 4

• Adding 1