Computer Science Quiz

The number base 2 is called binary. Shade one lozenge to show which number base is called hexadecimal.

• 6

• 8

• 10

• 16

Shade two lozenges to show the statements that are true about hexadecimal.

• Hexadecimal is faster to type than binary.

• Hexadecimal is faster for a computer to process than binary.

• Hexadecimal is easier for people to read than binary.

• Hexadecimal takes less space in RAM than binary.

• Hexadecimal can represent a greater range of numbers than binary.

Convert the decimal number 171 into binary.

Convert the hexadecimal number 2D into binary.

Add together the following three binary numbers and give your answer in binary.

Convert 16 000 000 bits to megabytes (MB).

Describe the binary shift that would be used to divide a binary number by four.

When a sound wave is converted to a digital form it is sampled. The sampling rate is measured in hertz (Hz). Define the term hertz.

A sampling rate of 20 000 Hz and a sample resolution of four bits is used to make a digital recording of a sound that lasts 50 seconds. What is the minimum file size of the recording in megabytes (MB)?

The term pixel is short for Picture Element. Define the term pixel.