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Computers MCQ Questions & Answers

Computers MCQs : This section focuses on the "Computers". These Multiple Choice Questions (MCQs) should be practiced to improve the Computers skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

Which of the following is not a computer bus?

A. Data bus
B. Control bus
C. Timer bus
D. Address bus

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Question 2

Which of the following is not a jump instruction?

A. JB (jump back)
B. JA (jump above)
C. JO (jump if overflow)
D. JMP (unconditional jump)

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Question 3

Which is not part of the execution unit (EU)?

A. Arithmetic logic unit (ALU)
B. Clock
C. General registers
D. Flags

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Question 4

Which of the following was not a design improvement for the 8086/8088 over the 8085?

A. Execution unit (EU)
B. 16-bit data bus
C. Arithmetic logic unit (ALU)
D. Bus interface unit (BIU)

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Question 5

Which of the following is not an 8086/8088 general-purpose register?

A. Code segment (CS)
B. Data segment (DS)
C. Stack segment (SS)
D. Address segment (AS)

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Question 6

During a read operation the CPU fetches ________.

A. a program instruction
B. another address
C. data itself
D. all of the above

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Question 7

Which method bypasses the CPU for certain types of data transfer?

A. Software interrupts
B. Interrupt-driven I/O
C. Polled I/O
D. Direct memory access (DMA)

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Question 8

Polled I/O works best when ________.

A. there are no priority considerations
B. priority considerations are frequent
C. the polling rate exceeds 1000 s
D. the polling rate is below 1000 s

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Question 9

The first microprocessor had a(n)________.

A. 1-bit data bus
B. 2-bit data bus
C. 4-bit data bus
D. 8-bit data bus

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Question 10

With interrupt-driven I/O, if two or more devices request service at the same time, ________.

A. the device closest to the CPU gets priority
B. the device that is fastest gets priority
C. the device assigned the highest priority is serviced first
D. the system is likely to crash

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Question 11

Which is not an operand?

A. Variable
B. Register
C. Memory location
D. Assembler

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Question 12

The first Intel microprocessor to contain on-board cache memory was the ________.

A. 80386
B. 80486
C. Pentium
D. Pentium Pro

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Question 13

What is occurring when two or more sources of data attempt to use the same bus?

A. Bus contention
B. Direct memory access
C. Bus interruption
D. PPI

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Question 14

DMA is particularly suited for data transfer between the ________.

A. disk drive and CPU
B. disk drive and RAM
C. disk drive and ROM
D. disk drive and I/O

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Question 15

A port can be ________.

A. strictly for input
B. strictly for output
C. bidirectional
D. all of the above

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Question 16

Which of the following is not an arithmetic instruction?

A. INC (increment)
B. CMP (compare)
C. DEC (decrement)
D. ROL (rotate left)

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Question 17

Which microprocessor has multiplexed data and address lines?

A. 8086/8088
B. 80286
C. 80386
D. Pentium

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Question 18

The Pentium can address ________.

A. 1 MB
B. 1 GB
C. 2 GB
D. 4 GB

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Question 19

The Pentium microprocessor has a data bus of ________.

A. 16 bits
B. 32 bits
C. 64 bits
D. 128 bits

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Question 20

The process of jointly establishing communication is called ________.

A. DMA
B. bidirectional addressing
C. multiplexing
D. handshaking

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Question 21

Which of the following is not a basic element within the microprocessor?

A. Microcontroller
B. Arithmetic logic unit (ALU)
C. Register array
D. Control unit

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Question 22

Which of the following is not an enhancement to the Pentium that was unavailable in the 8086/8088?

A. "Pipelined" architecture
B. Expansion of cache memory
C. Inclusion of an internal math coprocessor
D. Data/address line multiplexing

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Question 23

Which of the following is not a computer functional block?

A. Analog-to-digital converter
B. Central-processing unit
C. Memory
D. Input/output ports

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Question 24

Which bus is bidirectional?

A. Address bus
B. Control bus
C. Data bus
D. None of the above

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Question 25

A 20-bit address bus can locate ________.

A. 1,048,576 locations
B. 2,097,152 locations
C. 4,194,304 locations
D. 8,388,608 locations

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