Exercise: Microprocessors

Questions for: Microprocessors

Which of the following real expressions is correct in Pascal?
A:
- Z + P * X
B:
(X + Y) (A + B)
C:
Z ** M
D:
Z P * M
Answer: A

All others are incorrect.

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Which of the following is not treated as hexadecimal constant by assembler in 8085?
A:
64 H
B:
5 AFH
C:
AFH
D:
OCFH
Answer: C
No answer description is available. Let's discuss.
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Assertion (A): In 8085 WR and RD signals are active high.

Reason (R): LOW WR means write operation and low RD means read operation.

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R are correct but R is not correct explanation of A
C:
A is correct R is wrong
D:
A is wrong R is correct
Answer: D

WR and RD are active low.

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Read the following statements about sets
  1. If A and B are sets then A + B denotes union of sets A and B.
  2. The union of A and B is that set whose elements are in either A or B or both.
  3. If A and B are sets, then difference of sets A and B is denoted by A - B.
  4. A - B in the set obtained by removing elements of A from B.
Which of the above are true?
A:
All
B:
1, 2 and 3 only
C:
2 and 3 only
D:
1 and 4 only
Answer: A

All are correct.

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When we use RRC instruction once in 8085, the number is
A:
multiplied by 2
B:
divided by 2
C:
multiplied by 4
D:
divided by 4
Answer: B

When RRC is used once the number is divided by 2.

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