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.

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Total Questions

Practice Questions

Page 2 of 17
Question #21
Which of the following is an example of a control register?
A. Data register
B. Flag register
C. General purpose register
D. Accumulator
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Correct Answer: Option B

Explanation:
Flag or status registers hold information about the state of the CPU after operations.
This question belongs to: Computer CPU (Central Processing Unit)
Question #22
ALU performs operations on data received from:
A. Registers
B. Keyboard
C. Output devices
D. Secondary storage
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Correct Answer: Option A

Explanation:
ALU works with data held in CPU registers.
This question belongs to: Computer CPU (Central Processing Unit)
Question #23
The term 'microprocessor' refers to:
A. External memory chip
B. Graphics processing unit
C. A complete CPU on a single chip
D. Input device controller
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Correct Answer: Option C

Explanation:
Modern CPUs are implemented as microprocessors integrating ALU, CU, etc.
This question belongs to: Computer CPU (Central Processing Unit)
Question #24
During execution phase, the CPU:
A. Stores data in RAM
B. Carries out the decoded instruction
C. Fetches the next instruction
D. Decodes the opcode
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Correct Answer: Option B

Explanation:
Execution involves performing the actual operation specified by the instruction.
This question belongs to: Computer CPU (Central Processing Unit)
Question #25
Which component ensures synchronization in CPU operations?
A. Registers
B. ALU
C. Clock
D. Bus
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Correct Answer: Option C

Explanation:
The system clock generates timing signals for coordinating CPU activities.
This question belongs to: Computer CPU (Central Processing Unit)
Question #26
General Purpose Registers (GPRs) are used for:
A. Temporary storage of data and addresses
B. Only arithmetic operations
C. Input buffering
D. Permanent storage
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Correct Answer: Option A

Explanation:
GPRs provide flexible temporary storage during program execution.
This question belongs to: Computer CPU (Central Processing Unit)
Question #27
The von Neumann architecture features:
A. Shared memory for data and instructions
B. Only quantum processing
C. Separate memory for data and instructions
D. No CPU
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Correct Answer: Option A

Explanation:
In von Neumann model, instructions and data share the same memory space.
This question belongs to: Computer CPU (Central Processing Unit)
Question #28
What is the role of the Instruction Register?
A. Performs logic operations
B. Holds the current instruction being executed
C. Holds address of data
D. Controls clock speed
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Correct Answer: Option B

Explanation:
It stores the instruction fetched from memory for decoding.
This question belongs to: Computer CPU (Central Processing Unit)
Question #29
Hyper-threading technology allows a CPU core to:
A. Increase physical cores
B. Store more data
C. Reduce heat
D. Execute multiple threads simultaneously
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Correct Answer: Option D

Explanation:
It enables better utilization by handling multiple threads per core.
This question belongs to: Computer CPU (Central Processing Unit)
Question #30
The Memory Address Register (MAR) holds:
A. The address of memory location
B. The result of ALU
C. The data to be written
D. Control signals
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Correct Answer: Option A

Explanation:
MAR contains the address for memory read or write operations.
This question belongs to: Computer CPU (Central Processing Unit)
Question #31
Which is the fastest memory in a computer system?
A. Registers
B. Cache
C. RAM
D. Hard Disk
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Correct Answer: Option A

Explanation:
CPU registers offer the highest speed access.
This question belongs to: Computer CPU (Central Processing Unit)
Question #32
The CU generates:
A. Control signals
B. Data values
C. User interface
D. Arithmetic results
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Correct Answer: Option A

Explanation:
Control signals direct the operation of other CPU components.
This question belongs to: Computer CPU (Central Processing Unit)
Question #33
A dual-core processor has:
A. Two complete processing units
B. One ALU and two CUs
C. Half the speed
D. Double the registers only
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Correct Answer: Option A

Explanation:
It integrates two independent processing cores on one chip.
This question belongs to: Computer CPU (Central Processing Unit)
Question #34
Stack Pointer is a type of:
A. Status register
B. Data register
C. Address register
D. Accumulator
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Correct Answer: Option C

Explanation:
It points to the top of the stack in memory for function calls.
This question belongs to: Computer CPU (Central Processing Unit)
Question #35
Pipelining in CPU improves performance by:
A. Eliminating ALU
B. Overlapping instruction execution stages
C. Increasing clock speed only
D. Reducing number of registers
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Correct Answer: Option B

Explanation:
It allows multiple instructions to be processed in different stages concurrently.
This question belongs to: Computer CPU (Central Processing Unit)
Question #36
The term 'word size' in CPU refers to:
A. Number of instructions
B. Memory capacity
C. Number of bits processed at a time
D. Cache size
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Correct Answer: Option C

Explanation:
It determines the processor's data handling capacity.
This question belongs to: Computer CPU (Central Processing Unit)
Question #37
Which unit decodes machine instructions?
A. ALU
B. Memory
C. CU
D. I/O Controller
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Correct Answer: Option C

Explanation:
The Control Unit handles instruction decoding.
This question belongs to: Computer CPU (Central Processing Unit)
Question #38
Immediate addressing mode uses data directly from:
A. Register
B. The instruction itself
C. Stack
D. Memory location
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Correct Answer: Option B

Explanation:
Operand is embedded in the instruction.
This question belongs to: Computer CPU (Central Processing Unit)
Question #39
The primary purpose of the Status Register is to:
A. Hold addresses
B. Store program data
C. Indicate the outcome of operations like carry or zero flag
D. Control peripherals
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Correct Answer: Option C

Explanation:
It contains flags reflecting CPU state after arithmetic/logic ops.
This question belongs to: Computer CPU (Central Processing Unit)
Question #40
Superscalar architecture allows:
A. No pipelining
B. Slower execution
C. Multiple instructions per cycle
D. Single instruction per cycle
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Correct Answer: Option C

Explanation:
It executes more than one instruction per clock cycle.
This question belongs to: Computer CPU (Central Processing Unit)

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