8051 Instruction Set Questions

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1.

Which of the following is not an instruction of 8051 instructions?

A

arithmetic instructions

B

boolean instructions

C

logical instructions

D

none

Correct Answer: D

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2.

The operations performed by data transfer instructions are on

A

bit data

B

byte data

C

16-bit data

D

all of the mentioned

Correct Answer: D

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3.

Which of the following is true while executing data transfer instructions?

A

program counter is not accessible

B

restricted bit-transfer operations are allowed

C

both operands can be direct/indirect register operands

D

all of the mentioned

Correct Answer: C

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4.

The logical instruction that affects the carry flag during its execution is

A

XRL A;

B

ANL A;

C

ORL A;

D

RLC A;

Correct Answer: D

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5.

The instruction that is used to complement or invert the bit of a bit addressable SFR is

A

CLR C

B

CPL C

C

CPL Bit

D

ANL Bit

Correct Answer: C

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6.

The instructions that change the sequence of execution are

A

conditional instructions

B

logical instructions

C

control transfer instructions

D

data transfer instructions

Correct Answer: C

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7.

The control transfer instructions are divided into

A

explicit and implicit control transfer instructions

B

conditional and unconditional control transfer instructions

C

auto control and self control transfer instructions

D

all of the mentioned

Correct Answer: B

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8.

The conditional control transfer instructions check a bit condition which includes any bit of

A

bit addressable RAM

B

bit addressable SFRs

C

content of accumulator

D

all of the mentioned

Correct Answer: D

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9.

All conditional jumps are

A

absolute jumps

B

long jumps

C

short jumps

D

none

Correct Answer: C

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10.

The first byte of a short jump instruction represents

A

opcode byte

B

relative address

C

opcode field

D

none

Correct Answer: A

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