Digital Circuit and Microprocessor MCQs

Question 1

What will be content P.0 after the program?

Accepted Answer

0115H

Answer

00 FEH

Answer

0114 H

Answer

0119 H

Question 2

What will be the value of CY and AC after DDA instruction?

Accepted Answer

1, 1

Answer

0, 0

Answer

0, 1

Answer

1, 0

Question 3

The PC contains 0450 H and SP contains 08D 6H. what will be the content of PC and SP following a CALL to subroutine at location 02 AFH?

Accepted Answer

02 AFH, 08 D 4 H

Answer

0453 H, 08 D 8 H

Answer

0453 H, 08 D 4 H

Answer

02 AFH, 08 D 8 H

Question 4

What is the addressing mode used in instruction MOV M, C?

Accepted Answer

Indirect

Answer

Direct

Answer

Indened

Answer

Immediate

Question 5

What is the addressing mode used in instruction LXI B 034 H?

Accepted Answer

Immediate

Answer

Direct

Answer

Indirect

Answer

Indened

Question 6

How many and what one the machine cycles needed for execution of MOV A,M?

Accepted Answer

2, Fetch and Memory read

Answer

1, Fetch

Answer

2,Fetch and Memory write

Answer

2, Fetch and Bus idle

Question 7

How many and what are the machine cycles needed for execution of MOV D,C?

Accepted Answer

1, Fetch

Answer

2, Fetch and Memory read

Answer

2, Memory Read and Memory write

Answer

2, Fetch 4 Bus idle

Question 8

How many and what are the machine cycles needed for execution of PUSH B?

Accepted Answer

3, Fetch and 2 Memory write

Answer

2,Fetch and Memory write

Answer

3, Fetch, Memory write and read

Answer

3, Fetch and 2 Memory read

Question 9

8085 microprocessor is a

Accepted Answer

one address microprocessor

Answer

zero address microprocessor

Answer

two address microprossor

Answer

none of these