Instruction Set of 8086 8088 Questions

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21.

In general, the destination operand of an instruction can be

A

memory location

B

register

C

immediate data

D

memory location and register

Correct Answer: D

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22.

The instruction, CMP to compare source and destination operands it performs

A

addition

B

subtraction

C

division

D

multiplication

Correct Answer: B

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23.

During comparison operation, the result of comparing or subtraction is stored in

A

memory

B

registers

C

stack

D

no where

Correct Answer: D

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24.

The instruction that converts the result in an unpacked decimal digits is

A

AAA

B

AAA

C

AAM

D

All of the mentioned

Correct Answer: D

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25.

Which of the following is a mnemonic?

A

ADD

B

ADC

C

AAA

D

ADD & ADC

Correct Answer: C

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26.

The instruction in which adjustment is made before performing the operation is

A

AAA

B

AAS

C

AAM

D

AAD

Correct Answer: D

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27.

The expansion of DAA is

A

decimal adjust after addition

B

decimal adjust before addition

C

decimal adjust accumulator

D

decimal adjust auxiliary

Correct Answer: C

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28.

The instruction that is used to convert the result of the addition of two packed BCD numbers to a valid BCD number is

A

DAA

B

DAS

C

AAA

D

AAS

Correct Answer: A

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29.

The ROR instruction rotates the contents of the destination operand to

A

left

B

right

C

left and then right

D

right and then left

Correct Answer: B

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30.

The mnemonic that is placed before the arithmetic operation is performed is

A

AAA

B

AAS

C

AAM

D

AAD

Correct Answer: D

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