Pearson GCSE Computer Science - 3.1.1 von Neumann

What is the main function of the CPU in a computer system?

• a) Storage
• b) Processing
• c) Input
• d) Output

Answer explanation

The main function of the CPU (Central Processing Unit) in a computer system is processing data and instructions.

Which component of the CPU performs arithmetic and logical operations?

• a) Control Unit
• b) Arithmetic Logic Unit (ALU)
• c) Registers
• d) Clock

Answer explanation

The Arithmetic Logic Unit (ALU) performs arithmetic and logical operations in the CPU.

Which component of the CPU controls the flow of data and instructions within the CPU and between the CPU and other hardware components?

• a) Control Unit
• b) Arithmetic Logic Unit (ALU)
• c) Registers
• d) Clock

Answer explanation

The Control Unit controls the flow of data and instructions within the CPU and between the CPU and other hardware components.

Which component of the CPU temporarily holds data and instructions that the CPU is currently processing?

• a) Control Unit
• b) Arithmetic Logic Unit (ALU)
• c) Registers
• d) Clock

Answer explanation

Registers temporarily hold data and instructions that the CPU is currently processing.

Which component of the CPU generates and manages the timing signals for the CPU and other hardware components?

• a) Control Unit
• b) Arithmetic Logic Unit (ALU)
• c) Registers
• d) Clock

Answer explanation

The Clock generates and manages the timing signals for the CPU and other hardware components.

What is the function of the address bus in a computer system?

• a) It carries data between the CPU and memory
• b) It carries memory addresses between the CPU and memory
• c) It controls the flow of data and instructions within the CPU
• d) It performs arithmetic and logical operations within the CPU

Answer explanation

The function of the address bus is to carry memory addresses between the CPU and memory.

What is the function of the data bus in a computer system?

• a) It carries data between the CPU and memory
• b) It carries memory addresses between the CPU and memory
• c) It controls the flow of data and instructions within the CPU
• d) It performs arithmetic and logical operations within the CPU

Answer explanation

The function of the data bus is to carry data between the CPU and memory.

What is the function of the control bus in a computer system?

• a) It carries data between the CPU and memory
• b) It carries memory addresses between the CPU and memory
• c) It controls the flow of data and instructions within the CPU
• d) It performs arithmetic and logical operations within the CPU

Answer explanation

The function of the control bus is to control the flow of data and instructions within the CPU.

What is the purpose of the fetch stage in the fetch-decode-execute cycle?

• a) To retrieve data from memory
• b) To decode instructions
• c) To execute instructions
• d) To transfer data to memory

Answer explanation

The purpose of the fetch stage is to retrieve the next instruction from memory.

What is the purpose of the decode stage in the fetch-decode-execute cycle?

• a) To retrieve data from memory
• b) To decode instructions
• c) To execute instructions
• d) To transfer data to memory

Answer explanation

The purpose of the decode stage is to decode the instruction retrieved during the fetch stage.