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Q.

In PUSH instruction, after each execution of the instruction, the stack pointer is

A

incremented by 1

B

decremented by 1

C

incremented by 2

D

decremented by 2

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MCQ

1.

The instruction that pushes the flag register on to the stack is

A

PUSH

B

POP

C

PUSHF

D

POPF

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MCQ

2.

The instruction that subtracts 1 from the contents of the specified register/memory location is

A

INC

B

SUBB

C

SUB

D

DEC

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3.

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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4.

The instructions that involve various string manipulation operations are

A

branch instructions

B

flag manipulation instructions

C

shift and rotate instructions

D

string instructions

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5.

The instructions that are used for reading an input port and writing an output port respectively are

A

MOV, XCHG

B

MOV, IN

C

IN, MOV

D

IN, OUT

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