CPU (Central Processing Unit) MCQs

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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 Questions

Practice Questions

Page 8 of 17
Question #141
Which architecture is dominant in personal computers?
A. Only ARM
B. PowerPC exclusively
C. x86 / x86-64
D. MIPS only
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Correct Answer: Option C

Explanation:
Used by Intel and AMD for PCs.
This question belongs to: Computer CPU (Central Processing Unit)
Question #142
The commit stage ensures:
A. Fetch happens first
B. Architectural state is updated correctly
C. Decode only
D. ALU idle
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Correct Answer: Option B

Explanation:
Finalizes results in program order.
This question belongs to: Computer CPU (Central Processing Unit)
Question #143
AI accelerators integrated in CPUs target:
A. Basic addition
B. Inference and training workloads
C. Video playback only
D. File storage
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Correct Answer: Option B

Explanation:
For on-device AI processing.
This question belongs to: Computer CPU (Central Processing Unit)
Question #144
The associativity of cache affects:
A. Hit rate and complexity
B. Voltage
C. Core count
D. Clock speed
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Correct Answer: Option A

Explanation:
Higher associativity reduces conflicts.
This question belongs to: Computer CPU (Central Processing Unit)
Question #145
Which is a recent trend in CPU design (2026)?
A. Single core only
B. Removing caches
C. Decreasing transistor count
D. Increased focus on AI and efficiency with chiplets
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Correct Answer: Option D

Explanation:
Chiplet designs and AI integration are prominent.
This question belongs to: Computer CPU (Central Processing Unit)
Question #146
The bypass or forwarding in pipeline resolves:
A. Data hazards
B. All hazards equally
C. Structural hazards
D. Control hazards
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Correct Answer: Option A

Explanation:
Provides results directly to dependent instructions.
This question belongs to: Computer CPU (Central Processing Unit)
Question #147
Which company is known for high core count server CPUs?
A. AMD with EPYC
B. Printer companies
C. Software firms
D. Basic desktop makers
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Correct Answer: Option A

Explanation:
Competing in data center market.
This question belongs to: Computer CPU (Central Processing Unit)
Question #148
The physical address is generated from:
A. Direct from registers
B. Virtual address via MMU
C. ALU output
D. CU only
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Correct Answer: Option B

Explanation:
Memory Management Unit handles translation.
This question belongs to: Computer CPU (Central Processing Unit)
Question #149
TDP and PL (Power Limit) are managed by:
A. Firmware and OS for CPU power
B. Hardware fixed
C. No management
D. User manually always
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Correct Answer: Option A

Explanation:
Dynamic power management techniques.
This question belongs to: Computer CPU (Central Processing Unit)
Question #150
Which of the following improves single-threaded performance significantly?
A. More USB ports
B. Larger secondary storage
C. Higher clock speeds and better IPC
D. More slow cores
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Correct Answer: Option C

Explanation:
Key for many applications not parallelized.
This question belongs to: Computer CPU (Central Processing Unit)
Question #151
The coherence protocol like MESI is for:
A. ALU operations
B. Instruction fetch
C. Power saving
D. Cache coherence in multi-core systems
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Correct Answer: Option D

Explanation:
Maintains consistent data across caches.
This question belongs to: Computer CPU (Central Processing Unit)
Question #152
Future CPUs may increasingly use:
A. 3D stacking and advanced packaging
B. No integration
C. Analog processing
D. Larger single dies only
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Correct Answer: Option A

Explanation:
For higher density and performance.
This question belongs to: Computer CPU (Central Processing Unit)
Question #153
The issue stage in pipeline:
A. Writes results
B. Dispatches instructions to execution units
C. Fetches from memory
D. Decodes only
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Correct Answer: Option B

Explanation:
Assigns to appropriate functional units.
This question belongs to: Computer CPU (Central Processing Unit)
Question #154
Which is essential for real-time systems in CPUs?
A. Large cache irrelevant
B. High power
C. Maximum throughput only
D. Predictable low latency response
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Correct Answer: Option D

Explanation:
Deterministic behavior important.
This question belongs to: Computer CPU (Central Processing Unit)
Question #155
The last level cache (LLC) is usually:
A. Shared among cores
B. Non-existent
C. External
D. Per core private only
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Correct Answer: Option A

Explanation:
L3 or higher levels shared.
This question belongs to: Computer CPU (Central Processing Unit)
Question #156
Instruction Set Architecture (ISA) defines:
A. Physical layout
B. Manufacturing process
C. Cooling method
D. The interface between hardware and software
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Correct Answer: Option D

Explanation:
Like x86, ARM specify instructions.
This question belongs to: Computer CPU (Central Processing Unit)
Question #157
Which helps in debugging CPU issues?
A. Screen resolution
B. Performance Monitoring Counters (PMCs)
C. Only visual inspection
D. Keyboard input
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Correct Answer: Option B

Explanation:
Hardware counters for profiling.
This question belongs to: Computer CPU (Central Processing Unit)
Question #158
Chiplet design allows:
A. Higher costs always
B. No scalability
C. Single large die only
D. Modular manufacturing and better yields
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Correct Answer: Option D

Explanation:
Used in modern high-end processors.
This question belongs to: Computer CPU (Central Processing Unit)
Question #159
The execution unit in CPU may include:
A. Single unit only
B. Memory only
C. Multiple specialized ALUs and FPUs
D. No units
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Correct Answer: Option C

Explanation:
For different types of operations.
This question belongs to: Computer CPU (Central Processing Unit)
Question #160
Which is a benefit of smaller process nodes?
A. Larger chips
B. Slower speeds
C. Lower power, higher density
D. Higher leakage always
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Correct Answer: Option C

Explanation:
Improved efficiency and performance.
This question belongs to: Computer CPU (Central Processing Unit)

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