Discussion
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- Question
Which of the following is not an integer constant?
Options- A. 0
- B. -8
- C. +1074
- D. -8.1
- Correct Answer
- -8.1
ExplanationInteger constant should not have decimal point.
Microprocessors problems
Search Results
- 1. In which computer language is 'break' statement used
Options- A. Fortran 77
- B. Pascal
- C. C
- D. none of the above Discuss
Correct Answer: C
Explanation:
Whenever keyword 'break' is encountered inside any C loop control passes to the first statement after the loop.- 2. Temporary register in 8085 is a 16 bit register.
Options- A. True
- B. False Discuss
Correct Answer: False
Explanation:
It is 8 bit-register.- 3. The size of cache memory in most microcomputers is about
Options- A. a few bytes
- B. a few kilobytes
- C. a few megabytes
- D. a few gigabytes Discuss
Correct Answer: a few kilobytes
Explanation:
Size of Cache memory varies from about 16 K bytes to about 256 K bytes.- 4.
JCOKE = 3
JCOKE = JCOKE + 1
GO TO (5, 8, 9, 11, 15, 16 18, 20) JCOKE.
After the execution of above statement, the control is transferred to statement number
Options- A. 8
- B. 11
- C. 16
- D. 20 Discuss
Correct Answer: 11
Explanation:
It is a computed GO TO statement. Since J COKE = 3 + 1 = 4, the control is transferred to statement 11.- 5. Expression ++i is equivalent to
Options- A. i = i + 2
- B. i = i + 1
- C. i = i - 1
- D. i = i + i + i Discuss
Correct Answer: i = i + 1
Explanation:
i is incremented by 1.- 6. Z flag is reset if an ALU operation results in 0.
Options- A. True
- B. False Discuss
Correct Answer: False
Explanation:
Z flag is set if ALU operation results in zero.- 7. Assertion (A): Microprocessor 8085 has on-chip oscillator with inbuilt crystal.
Reason (R): For frequency stability crystal oscillator is preferred.
Options- 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 Discuss
Correct Answer: A is wrong R is correct
Explanation:
Crystal has to be connected externally to pins 1 and 2 of 8085.- 8. Which of the following is not a valid real constant in C?
Options- A. 1.2 e 2.0
- B. -2.3 e - 2
- C. -2.3 E 2
- D. -2.3 e 2 Discuss
Correct Answer: -2.3 E 2
Explanation:
In C real constant expressed in exponential form, mantissia and exponent should be separated by e (and not E).- 9. Assertion (A): If source and destination addresses are made implicit the length of instruction is reduced.
Reason (R): 8085 has only 3 addressing modes.
Options- 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 Discuss
Correct Answer: A is correct R is wrong
Explanation:
The number of addressing modes is five.- 10. To multiply a number by 8 in 8085 we have to use
RAL instruction
Options- A. once
- B. twice
- C. thrice
- D. four times Discuss
Correct Answer: thrice
Explanation:
When RAL instruction is used once the number is doubled.
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