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Q.

The instruction that is used as prefix to an instruction to execute it repeatedly until the CX register becomes zero is

A

SCAS

B

REP

C

CMPS

D

STOS

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MCQ

1.

Which of the following instruction is not valid?

A

MOV AX, BX

B

MOV DS, 5000H

C

MOV AX, 5000H

D

PUSH AX

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2.

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

A

memory

B

registers

C

stack

D

no where

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3.

The instruction that supports addition when carry exists is

A

ADD

B

ADC

C

ADD & ADC

D

None of the mentioned

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4.

The flag that acts as Borrow flag in the instruction, SBB is

A

direction flag

B

carry flag

C

parity flag

D

trap flag

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5.

The instruction that is used to transfer the data from source operand to destination operand is

A

data copy/transfer instruction

B

branch instruction

C

arithmetic/logical instruction

D

string instruction

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