Instruction set architecture Questions

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11.

Which of the following is not a data type of 80286?

A

Ordinal or unsigned

B

ASCII

C

Packed BCD

D

None of the mentioned

Correct Answer: D

The 80286 supports seven data types. They are 1. integer 2. Ordinal (unsigned) 3. pointer 4. string 5. ASCII 6. BCD 7. Packed BCD.

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12.

The representation of 8-bit or 16-bit signed binary operands using 2

A

Ordinal

B

ASCII

C

Packed BCD

D

integer

Correct Answer: D

In integer data type, 8-bit or 16-bit signed binary operands are represented using 2

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13.

The instruction that pushes the general purpose registers, pointer and index registers on to the stack is

A

POPF

B

PUSH Imd

C

PUSH*A

D

PUSHF

Correct Answer: C

The PUSH*A instruction, pushes the general purpose registers, AX, CX, DX and BX, pointer and index registers, SP, BP, SI, DI, on to the stack.

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14.

While executing the PUSH*A instruction, the stack pointer is decremented by

A

1 bit

B

2 bits

C

4 bits

D

16 bits

Correct Answer: B

The stack pointer is decremented by 16 (eight 2-byte registers).

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15.

The statement that is true for the instruction POP*A is

A

flags are unaffected

B

no operands are required

C

exceptions generated are same as that of PUSH*A

D

all of the mentioned

Correct Answer: D

The POP*A instruction, pops all the contents of the registers DI, SI, BP, SP, BX, DX, CX and AX from the stack in this sequence, that is exactly opposite to that of pushing.

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16.

The instruction that multiplies the content of AL with a signed immediate operand is

A

MUL

B

SMUL

C

IMUL

D

None of the mentioned

Correct Answer: C

The IMUL instruction multiplies the content of AL with a signed immediate operand, and the signed 16-bit result is stored in AX.

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17.

The instruction that represents the

A

RCL

B

RCR

C

ROR

D

All of the mentioned

Correct Answer: D

The rotate source, count is a group of four instructions containing RCL, RCR, ROL, ROR.

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