assembly code

Question

Answer 1

Answer is C.

MVI A 30H                      // Move 30H into the accumulator

Accumulator contains 0011 0000

ACI 30 H                        //Add 30H to the contents of accumulator

Accumulator contains 0110 0000

XRA A                           //XOR with Accumulator

Accumulator contents becomes 0000 0000

POP                              // top of the stack will be copied to H register. It do not affect the contents of Accumulator

Finally the Contents of the Accumulator are 0000 0000 I.e. 00H

Comments

On which register you apply xor.

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XOR with Accumulator A. (A XOR A = 0)

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no i don't think so 

reference read this: http://microprocessorforyou.blogspot.in/2012/06/instruction-9.html

http://microprocessorforyou.blogspot.in/2012/05/instruction-7.html

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5.XRA: - The content of accumulator are exclusive OR with specified register or memory location.

XRA B means A xor B.... Performing exclusive or between contents of A and B

In the question it is given that XRA A

Exclusive or accumulator with itself. Results in clearing its contents.

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here in question, A is separate register or accumulator.

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A is accumulator