8085 Microprocessor MCQ

81. For which one of the following, the instruction XRA A in 8085 microprocessor can be used?

1. Set the carry flag
2. Set the zero flag
3. Reset the carry flag and clear the accumulator
4. Transfer FFH to the accumulator
   

82. An 8085 microprocessor is executing the programme as follows:

             MVI A, 20H

       MVI B, 10H

BACK: NOP

              ADD B

              RLC

              JNC BACK

              HLT

How many times the instruction NOP will be executed?

1. 4
2. 3
3. 2
4. 1

83. The stack pointer of an 8085 microprocessor is ABCD H. At the end of execution of the sequence of instructions, what will be the content of the stack pointer?

PUSH PSW

XTHL

PUSH D

JMP FC70 H

1. ABCB H
2. ABCA H
3. ABC9 H
4. ABC8 H

84. What is the correct 8085 assembly language instruction that stores the contents of H and L registers into the memory locations 1080 H and 1081 H respectively?

1. SPHL 1080 H
2. SHLD 1080 H
3. STAX 1080 H
4. SPHL 1081 H
   

85. When the operand requires for instruction is stored inside the processor, then What this addressing mode is called?

1. Direct
2. Register
3. Implicit
4. Immediate

86. Which one of the following addressing technique is not used in 8085 microprocessor?

1. Register
2. Immediate
3. Register indirect
4. Relative

87. In an instruction of 8085 microprocessor, how many bytes are present?

1. One or two
2. One, two or three
3. One only
4. Two or three

88. Which one is the indirect addressing mode in the following instructions?

1. LXI H 2050 H
2. MOV A, B
3. LDAX B
4. LDA 2050 H

89. The addressing mode used in the instruction JMP F347 H in case of an Intel 8085A microprocessor is which one of the following?

1. Direct
2. Register—indirect
3. Implicit
4. Immediate

90. Carry flag is not affected after the execution of

1. ADD B
2. SBB B
3. INR B
4. ORA B