G8 Term 1 Revision

Which unit controls the work done by the CPU?

• Arithmetic and Logic Unit
• Memory unit
• Clock
• Control Unit

Which part of the CPU does all the calculations?

• Control Unit
• Buses
• ALU
• Clock

Which part of the CPU sends regular pulses to keep it working?

• ALU
• Clock
• Bus
• Memory

What do buses do in a CPU?

• Carry people to the CPU
• Carry data between CPU parts
• Block instructions
• Connect output devices only

What is the main function of a CPU?

• Store data forever
• Perform all computer tasks using simple instructions
• Manage only sound files
• Control input devices only

Why does a CPU seem powerful when it does simple tasks?

• It uses long instructions
• It does many simple tasks very quickly
• It can think like humans
• It uses no clock speed

What happens in the ‘fetch’ stage of the fetch-execute cycle?

• ALU does calculations
• Control unit gets instructions from RAM
• Clock stops working
• Data is stored permanently

Where does the ‘decode’ stage happen?

• ALU
• RAM
• Control Unit
• Buses

What does ‘execute’ mean in the fetch-execute cycle?

• Save instructions to RAM
• Carry out the instruction
• Decode binary code
• Store files on disk

Which statement best describes RAM?

• It stores data permanently
• It is very far from the CPU
• It loses data when power is off
• It only holds instructions