CPU (Central Processing Unit) MCQs

Computer

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.

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Total Questions

Practice Questions

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Question #41
Which of the following is part of the CPU's data path?
A. Monitor
B. Keyboard
C. Printer
D. ALU and registers
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Correct Answer: Option D

Explanation:
Data path includes components for data manipulation like ALU and registers.
This question belongs to: Computer CPU (Central Processing Unit)
Question #42
The clock speed of CPU affects:
A. Display resolution
B. Processing speed
C. Storage capacity
D. Internet speed
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Correct Answer: Option B

Explanation:
Higher clock speed generally means faster instruction execution.
This question belongs to: Computer CPU (Central Processing Unit)
Question #43
RISC architecture is characterized by:
A. No registers
B. Complex instructions
C. Simple instructions and more registers
D. Only software implementation
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Correct Answer: Option C

Explanation:
Reduced Instruction Set Computing uses simpler instructions for efficiency.
This question belongs to: Computer CPU (Central Processing Unit)
Question #44
The Memory Buffer Register (MBR) holds:
A. Next program address
B. Control signals
C. Data being transferred to or from memory
D. Address only
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Correct Answer: Option C

Explanation:
It acts as a buffer for data movement between CPU and memory.
This question belongs to: Computer CPU (Central Processing Unit)
Question #45
Multi-threading in processors helps in:
A. Better resource utilization during waits
B. Eliminating need for OS
C. Slower computation
D. Reducing memory usage
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Correct Answer: Option A

Explanation:
It allows handling multiple threads to keep CPU busy.
This question belongs to: Computer CPU (Central Processing Unit)
Question #46
Which is true about CPU temperature management?
A. Requires heat sinks and fans
B. Not important
C. Irrelevant for performance
D. Handled only by software
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Correct Answer: Option A

Explanation:
Proper cooling is essential to prevent throttling and damage.
This question belongs to: Computer CPU (Central Processing Unit)
Question #47
The bus that carries data between CPU and memory is called:
A. Data bus
B. Address bus
C. System bus
D. Control bus
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Correct Answer: Option A

Explanation:
Data bus transfers actual data values.
This question belongs to: Computer CPU (Central Processing Unit)
Question #48
Out-of-order execution is a feature in:
A. Only embedded systems
B. Modern advanced processors
C. No processors
D. Basic CPUs only
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Correct Answer: Option B

Explanation:
It allows reordering instructions for better performance.
This question belongs to: Computer CPU (Central Processing Unit)
Question #49
The ALU can perform:
A. Storage only
B. Only addition
C. No comparisons
D. Shift operations in some designs
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Correct Answer: Option D

Explanation:
ALU typically supports arithmetic, logic, and bit manipulation including shifts.
This question belongs to: Computer CPU (Central Processing Unit)
Question #50
Branch prediction helps CPU to:
A. Increase memory size
B. Reduce clock cycles
C. Avoid pipeline stalls in conditional branches
D. Eliminate registers
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Correct Answer: Option C

Explanation:
It guesses the outcome of branches to keep pipeline full.
This question belongs to: Computer CPU (Central Processing Unit)
Question #51
Which register is used to store the result of comparison operations?
A. Program Counter
B. Accumulator
C. MAR
D. Flag Register
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Correct Answer: Option D

Explanation:
Flags indicate results such as zero, carry, overflow.
This question belongs to: Computer CPU (Central Processing Unit)
Question #52
CISC stands for:
A. Cache Instruction Set Computer
B. Central Integrated System Computer
C. Complex Instruction Set Computer
D. Control Instruction Set Computer
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Correct Answer: Option C

Explanation:
CISC uses complex multi-step instructions.
This question belongs to: Computer CPU (Central Processing Unit)
Question #53
The number of transistors in modern CPUs follows:
A. Moore's Law trend
B. Irrelevant
C. No change
D. Decreasing trend
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Correct Answer: Option A

Explanation:
Transistor count doubles approximately every two years.
This question belongs to: Computer CPU (Central Processing Unit)
Question #54
Interrupt handling is managed by:
A. ALU
B. Control Unit
C. External devices only
D. Registers only
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Correct Answer: Option B

Explanation:
CU responds to interrupts by saving state and handling requests.
This question belongs to: Computer CPU (Central Processing Unit)
Question #55
Vector processing is useful for:
A. Database queries
B. Text processing only
C. Single data operations
D. Parallel operations on arrays of data
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Correct Answer: Option D

Explanation:
SIMD (Single Instruction Multiple Data) for scientific computing.
This question belongs to: Computer CPU (Central Processing Unit)
Question #56
The Instruction Pointer is another name for:
A. Program Counter
B. MAR
C. MBR
D. Accumulator
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Correct Answer: Option A

Explanation:
It points to the next instruction in memory.
This question belongs to: Computer CPU (Central Processing Unit)
Question #57
Thermal Design Power (TDP) of CPU indicates:
A. Number of cores
B. Clock speed
C. Maximum heat generated under load
D. Storage capacity
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Correct Answer: Option C

Explanation:
It guides cooling solution requirements.
This question belongs to: Computer CPU (Central Processing Unit)
Question #58
Which of the following is a disadvantage of increasing CPU clock speed?
A. Better efficiency
B. Higher power consumption and heat
C. Lower cost
D. Easier manufacturing
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Correct Answer: Option B

Explanation:
Higher frequencies lead to more power draw and heat issues.
This question belongs to: Computer CPU (Central Processing Unit)
Question #59
The Control Unit can be implemented as:
A. Hardwired or microprogrammed
B. Software only
C. Hardwired only
D. ALU based
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Correct Answer: Option A

Explanation:
Both designs are used depending on flexibility needs.
This question belongs to: Computer CPU (Central Processing Unit)
Question #60
Floating point operations are typically handled by:
A. Registers exclusively
B. CU only
C. ALU (in modern CPUs with FPU)
D. Memory
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Correct Answer: Option C

Explanation:
Floating Point Unit is integrated with ALU for real number ops.
This question belongs to: Computer CPU (Central Processing Unit)

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