GATE 2019: Microprocessor Quiz 2

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Question 1

For the assembly code showed below answer the following questions.

The contents of HL on completion of JMP instruction ……….

• A2053H
• B2055H
• C4008H
• DNone of these

Question 2

Consider an 8085-microprocessor system. Memory location 2100H contains byte FFH, register A contains byte 36H and carry flag CY=0.
LDA 2100H
INR A
What will be the content of register A and the value of the carry flag after execution of the above program?

• AA will contain 36H, CY=0
• BA will contain 36H, CY=1
• CA will contain 00H, CY=0
• DA will contain 36H, CY=1

Question 3

Consider an 8085-microprocessor system. The accumulator contains A7H. CY flag = 0. Consider the program snippet below:
RRC
RAL
RAL
RAL
Which of the following is true after the above program is executed?

• AA will contain 9FH, CY=1
• BA will contain 9FH, CY=0
• CA will contain F9H, CY=0
• DA will contain F9H, CY=1

Question 4

When RET instruction is executed by any subroutine called in main program by “CALL” instruction, then

• Awithout any operation the program would resume from instruction immediately following the CALL instruction.
• Bthe instruction pointer will be incremented after the execution of the instruction.
• Ctop of the stack will be popped out and assigned to program counter.
• Dboth A and C

Question 5

A memory chip is interfaced with 8085 microprocessor. The chip select signal (CS) is generated by connecting address line with odd numbers to inputs of 8 input NOR gate. The largest memory address that can be addressed is ___________ Hex.

• A5555
• B5556
• C5557
• D5558

Question 6

Which of the following statement is incorrect regarding INTEL 8085?

• ARead/Write memory is used for temporary storage.
• BCarry flag is modified in RAL and RLC both.
• CLogical instructions do not affect the carry flag.
• DWhen RET instruction is executed stack pointer is incremented by 2.

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