Computer Science

Question 1

What is the purpose of the ALU?

Answer 1

Performs all arithmetic functions e.g addition and subtraction

Question 2

What is the purpose of the control unit ?

Answer 2

The CU coordinates all activities of the CPU

Question 3

What are registers?

Answer 3

They are quick, small stores of data within the CPU

Question 4

What is the purpose of the MAR?

Answer 4

It holds the memory address for data or instructions about to be used by the CPU

Question 5

What is the purpose of the MDR?

Answer 5

It holds the actual data or instruction.

Question 6

What is the purpose of the accumulator?

Answer 6

It stores results of calculations done by the ALU

Question 7

What is the purpose of the program counter (PC)?

Answer 7

It holds the memory address of the instruction for each cycle

Question 8

What is the fetch part of the fetch-decode-execute cycle?

Answer 8

This is where the next instruction is retrieved by the CPU from main memory

Question 9

What is the decode part of the fetch-decode-execute cycle?

Answer 9

The instruction is broken down and decoded so the computer can understand

Question 10

What is the execute part of the fetch-decode-execute cycle?

Answer 10

This is where the CPU performs what the instruction tells it to.