Computer Architecture Practice MCQs

Question 1

During which machine-cycle stage does the control unit interpret the fetched instruction?

Accepted Answer

Decode

Answer

Execute

Answer

Fetch

Answer

Store input

Question 2

What is the basic purpose of a computer?

Accepted Answer

D. Accept data, process it under program control, store it and produce information

Answer

Transmit analog signals without processing

Answer

Store data without executing instructions

Answer

Only display text on a screen

Answer

Accept data, process it under program control, store it and produce information

Question 3

Which sequence correctly represents the basic instruction cycle?

Accepted Answer

A. Fetch, decode, execute

Answer

Fetch, decode, execute

Answer

Decode, execute, fetch

Answer

Execute, fetch, decode

Answer

Store, print, fetch

Question 4

Which CPU register normally contains the address of the next instruction?

Accepted Answer

B. Program counter

Answer

Accumulator

Answer

Program counter

Answer

Instruction register

Answer

Memory data register

Question 5

What does the instruction register hold?

Accepted Answer

A. The instruction currently being decoded or executed

Answer

The instruction currently being decoded or executed

Answer

The address of every I/O device

Answer

The result of every previous program

Answer

The size of main memory

Question 6

What is held in the memory address register during a memory access?

Accepted Answer

D. The address of the memory location being accessed

Answer

The data returned by the ALU

Answer

The number of clock cycles elapsed

Answer

The current instruction opcode only

Answer

The address of the memory location being accessed

Question 7

What is the role of the memory data register?

Accepted Answer

A. Hold data being transferred to or from memory

Answer

Hold data being transferred to or from memory

Answer

Generate the next instruction address

Answer

Select an input peripheral

Answer

Decode the operation code

Question 8

Which CPU component performs arithmetic and logical operations?

Accepted Answer

C. Arithmetic and logic unit

Answer

Program counter

Answer

Control unit

Answer

Arithmetic and logic unit

Answer

Input unit

Question 9

What is the main responsibility of the control unit?

Accepted Answer

C. Direct the sequence of operations by generating control signals

Answer

Convert every input into analog form

Answer

Perform only addition and subtraction

Answer

Direct the sequence of operations by generating control signals

Answer

Store files permanently

Question 10

Why are CPU registers faster to access than main memory?

Accepted Answer

B. They are small storage locations built directly into the processor

Answer

They are accessed through a network

Answer

They are small storage locations built directly into the processor

Answer

They use magnetic disks

Answer

They contain only program source code

Question 11

Which register commonly stores an intermediate arithmetic result?

Accepted Answer

C. Accumulator

Answer

Instruction register

Answer

Program counter

Answer

Accumulator

Answer

Memory address register

Question 12

What normally happens to the program counter after a sequential instruction is fetched?

Accepted Answer

A. It advances to the address of the following instruction

Answer

It advances to the address of the following instruction

Answer

It is cleared permanently

Answer

It becomes the instruction register

Answer

It receives the arithmetic result

Question 13

Which bus carries the location that the processor wants to access?

Accepted Answer

B. Address bus

Answer

Expansion clock

Answer

Address bus

Answer

Data bus

Answer

Control bus

Question 14

Which bus carries instruction and operand values between the CPU and memory?

Accepted Answer

C. Data bus

Answer

Address bus

Answer

Clock bus only

Answer

Data bus

Answer

Power bus

Question 15

Which bus carries signals such as memory read and memory write?

Accepted Answer

Control bus

Answer

Video bus

Answer

Data bus

Answer

Address bus

Computer Architecture Practice MCQs

Computer Architecture Free MCQs

During which machine-cycle stage does the control unit interpret the fetched instruction?

What is the basic purpose of a computer?

Which sequence correctly represents the basic instruction cycle?

Which CPU register normally contains the address of the next instruction?

What does the instruction register hold?

What is held in the memory address register during a memory access?

What is the role of the memory data register?

Which CPU component performs arithmetic and logical operations?

What is the main responsibility of the control unit?

Why are CPU registers faster to access than main memory?

Which register commonly stores an intermediate arithmetic result?

What normally happens to the program counter after a sequential instruction is fetched?

Which bus carries the location that the processor wants to access?

Which bus carries instruction and operand values between the CPU and memory?

Which bus carries signals such as memory read and memory write?

During execution of an ADD instruction, which unit performs the addition?

What does CPU organization describe?

What is the role of main memory while a program runs?

A processor has a 16-bit address bus. How many distinct addresses can it represent?

Which part of an instruction specifies the operation to perform?

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