Instruction Set Features – 1 MCQ’s

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This set of Microprocessor Multiple Choice Questions & Answers (MCQs) focuses on “Instruction Set Features – 1″.

1. In register address mode, the operand is stored in
a) 8-bit general purpose register
b) 16-bit general purpose register
c) si or di
d) all of the mentioned

2. In which of the following addressing mode, the offset is obtained by adding displacement and contents of one of the base registers?
a) direct mode
b) register mode
c) based mode
d) indexed mode

3. In which of these modes, the immediate operand is included in the instruction itself?
a) register operand mode
b) immediate operand mode
c) register and immediate operand mode
d) none of the mentioned

4. In which of the following addressing mode, the offset is obtained by adding displacement, with the contents of SI?
a) direct mode
b) register mode
c) based mode
d) indexed mode

5. 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

6. 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

7. The address of a location of the operand is calculated by adding the contents of any of the base registers, with the contents of any of index registers in
a) based indexed mode with displacement
b) based indexed mode
c) based mode
d) indexed mode

8. The representation of 8-bit or 16-bit signed binary operands using 2’s complement is a data type of
a) Ordinal
b) ASCII
c) Packed BCD
d) integer

9. While executing the PUSH*A instruction, the stack pointer is decremented by
a) 1 bit
b) 2 bits
c) 4 bits
d) 16 bits

10. 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

11. 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

12. The instruction that represents the ‘rotate source, count’ is
a) RCL
b) RCR
c) ROR
d) All of the mentioned

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