CPU (Central Processing Unit) MCQs

Practice CPU MCQs with answers and explanations covering ALU, CU, registers, processors and central processing unit concepts frequently asked in competitive exams.

327 Total

Question #201 Report Error

AVX-512 refers to:

A. 512-bit vector instruction extensions

B. Core count

C. Cache level

D. Power management

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Correct Answer: Option A

Explanation:
It enables wider SIMD operations.

This question belongs to: Computer CPU (Central Processing Unit)

Question #202 Report Error

The Program Status Word (PSW) contains:

A. Instruction address only

B. Data operands

C. Memory map

D. Condition codes and status information

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Correct Answer: Option D

Explanation:
It holds processor state.

This question belongs to: Computer CPU (Central Processing Unit)

Question #203 Report Error

Dynamic frequency scaling is also known as:

A. Underclocking only

B. Overclocking

C. CPU throttling or DVFS

D. Static speed

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Correct Answer: Option C

Explanation:
It adjusts frequency based on workload.

This question belongs to: Computer CPU (Central Processing Unit)

Question #204 Report Error

In CPU, 'retirement' refers to:

A. Decoding phase

B. Fetching instructions

C. Committing instruction results to architectural state

D. Memory access

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Correct Answer: Option C

Explanation:
It completes the instruction lifecycle.

This question belongs to: Computer CPU (Central Processing Unit)

Question #205 Report Error

The MESI protocol is used for:

A. ALU operations

B. Instruction fetch

C. Power gating

D. Cache coherence

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Correct Answer: Option D

Explanation:
Modified, Exclusive, Shared, Invalid states.

This question belongs to: Computer CPU (Central Processing Unit)

Question #206 Report Error

Which is a characteristic of ARM processors?

A. Energy efficiency for mobile devices

B. CISC architecture

C. High power consumption desktops

D. Limited to servers

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Correct Answer: Option A

Explanation:
They dominate mobile and embedded markets.

This question belongs to: Computer CPU (Central Processing Unit)

Question #207 Report Error

The reorder buffer enables:

A. No speculation

B. In-order commit with out-of-order execution

C. In-order execution only

D. Reduced registers

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Correct Answer: Option B

Explanation:
It maintains program order.

This question belongs to: Computer CPU (Central Processing Unit)

Question #208 Report Error

What does 'uop' stand for?

A. Ultra operation

B. User operation

C. Unified operation

D. Micro-operation

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Correct Answer: Option D

Explanation:
CISC instructions are decoded into micro-ops.

This question belongs to: Computer CPU (Central Processing Unit)

Question #209 Report Error

Thermal throttling occurs when CPU:

A. Reduces frequency to prevent overheating

B. Increases voltage

C. Shuts down completely

D. Overclocks automatically

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Correct Answer: Option A

Explanation:
It protects hardware from damage.

This question belongs to: Computer CPU (Central Processing Unit)

Question #210 Report Error

The Instruction Decode Queue (IDQ) holds:

A. Decoded micro-operations

B. Results

C. Raw instructions

D. Memory addresses

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Correct Answer: Option A

Explanation:
It feeds the execution engine.

This question belongs to: Computer CPU (Central Processing Unit)

Question #211 Report Error

x86-64 is also known as:

A. ARM64

B. RISC-V

C. AMD64 or Intel 64

D. MIPS64

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Correct Answer: Option C

Explanation:
It is the 64-bit extension of x86.

This question belongs to: Computer CPU (Central Processing Unit)

Question #212 Report Error

Prefetching in CPU aims to:

A. Reduce cache misses by loading data early

B. Limit registers

C. Increase power usage

D. Slow down execution

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Correct Answer: Option A

Explanation:
Hardware or software prefetchers anticipate needs.

This question belongs to: Computer CPU (Central Processing Unit)

Question #213 Report Error

Which register points to the current stack location?

A. Base Pointer

B. Stack Pointer

C. Index Register

D. Program Counter

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Correct Answer: Option B

Explanation:
It manages stack operations like push/pop.

This question belongs to: Computer CPU (Central Processing Unit)

Question #214 Report Error

Heterogeneous computing typically combines:

A. CPU and GPU or specialized accelerators

B. Software layers

C. Only identical cores

D. Memory modules

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Correct Answer: Option A

Explanation:
It optimizes different workloads.

This question belongs to: Computer CPU (Central Processing Unit)

Question #215 Report Error

The latency of register access is:

A. 1 clock cycle or less

B. Hundreds of cycles

C. Same as main memory

D. Variable by design

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Correct Answer: Option A

Explanation:
Registers are the fastest storage.

This question belongs to: Computer CPU (Central Processing Unit)

Question #216 Report Error

Zen 5 is an example of:

A. ARM core

B. GPU architecture

C. AMD CPU microarchitecture

D. Intel design

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Correct Answer: Option C

Explanation:
It powers recent Ryzen processors.

This question belongs to: Computer CPU (Central Processing Unit)

Question #217 Report Error

Speculative execution can lead to:

A. Security vulnerabilities like Spectre

B. Always secure processing

C. Reduced performance

D. No side effects

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Correct Answer: Option A

Explanation:
It requires mitigations for information leaks.

This question belongs to: Computer CPU (Central Processing Unit)

Question #218 Report Error

The front-end pipeline bottleneck often involves:

A. Memory writes

B. Retirement stage

C. Instruction fetch and decode bandwidth

D. Execution units

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Correct Answer: Option C

Explanation:
It limits instruction supply.

This question belongs to: Computer CPU (Central Processing Unit)

Question #219 Report Error

Power gating technique turns off:

A. Unused circuit blocks to save leakage power

B. Cache only

C. All cores simultaneously

D. ALU permanently

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Correct Answer: Option A

Explanation:
It improves energy efficiency.

This question belongs to: Computer CPU (Central Processing Unit)

Question #220 Report Error

Which company introduced the first commercial microprocessor?

A. Intel with 4004

B. IBM

C. Motorola

D. AMD

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Correct Answer: Option A

Explanation:
In 1971.

This question belongs to: Computer CPU (Central Processing Unit)

CPU (Central Processing Unit) MCQs

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