GCSE Computer Science Exam

What is the smallest unit of measurement in digital data?

• Bit

• Byte

• Kibibyte

• Nibble

What is the maximum number of different values that can be represented with 5 bits?

• 5

• 16

• 25

• 32

A car park’s number‐plate recognition system counts the number of cars entering. Which reason best explains why an unsigned integer is used for this purpose?

• Unsigned integers are more accurate

• Unsigned integers cannot have overflow errors

• Unsigned integers store more positive values

• Unsigned integers do not use a parity bit

How can the number of bytes in 6 tebibytes be expressed (without carrying out the calculation)?

• 6 × 2²⁰

• 6 × 2³⁰

• 6 × 2⁴⁰

• 6 × 2⁵⁰

Which of the following 4‐bit binary additions will result in an overflow error?

• 1001 + 1000

• 0011 + 1001

• 1000 + 0110

• 0111 + 1000

What is the correct 8‐bit binary representation of the denary number 82?

• 01010010

• 10100100

• 01010100

• 10101001

Convert the binary number 0011 1101 to hexadecimal.

• 3D

• 3E

• 3F

• 3C

During the instruction fetch cycle, what is the primary role of the control bus?

• To transfer the instruction from memory to the CPU

• To send control signals that coordinate the actions of all components

• To temporarily store data

• To provide power to the processor

Which bus is responsible for transferring data between the processor and memory?

• Control Bus

• Data Bus

• Address Bus

• Power Bus

Which of the following best describes how an operating system allocates processor time?

• It uses a round robin method where each process is given a fixed time slice

• It processes tasks strictly in the order they are received

• It always gives priority to system processes over user processes

• It allocates processor time randomly