Instruction Set of 8086 8088 Questions

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11.

The instruction that loads the AH register with the lower byte of the flag register is

A

SAHF

B

AH

C

LAHF

D

PUSHF

Correct Answer: C

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12.

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

A

PUSH

B

POP

C

PUSHF

D

POPF

Correct Answer: C

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13.

The instruction that loads the flag register completely from the word contents of the memory location is

A

PUSH

B

POP

C

PUSHF

D

POPF

Correct Answer: D

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14.

The instruction that adds immediate data/contents of the memory location specified in an instruction/register to the contents of another register/memory location is

A

SUB

B

ADD

C

MUL

D

DIV

Correct Answer: B

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15.

The instruction that supports addition when carry exists is

A

ADD

B

ADC

C

ADD & ADC

D

None of the mentioned

Correct Answer: B

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16.

The instruction,

A

2

C

1

D

3

Correct Answer: C

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17.

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

A

INC

B

SUBB

C

SUB

D

DEC

Correct Answer: D

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18.

The instruction that enables subtraction with borrow is

A

DEC

B

SUB

C

SBB

D

None of the mentioned

Correct Answer: C

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19.

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

A

direction flag

B

carry flag

C

parity flag

D

trap flag

Correct Answer: B

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20.

In general, the source operand of an instruction can be

A

memory location

B

register

C

immediate data

D

all of the mentioned

Correct Answer: D

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