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MCQs

Total Questions : 275 | Page 27 of 28 pages
Question 261. PSW stands for
  1.     none
  2.     accumulator and flag register contents
  3.     accumulator contents
  4.     flag byte
 Discuss Question
Answer: Option B. ->  accumulator and flag register contents
Question 262. DMA is used between
  1.     memory and I/O
  2.     none
  3.     microprocessor and I/O
  4.     microprocessor and memory
 Discuss Question
Answer: Option A. ->  memory and I/O
Question 263. Temporary registers in 8085 are
  1.     D and E.
  2.     B and C.
  3.     H and L.
  4.     W and Z.
 Discuss Question
Answer: Option D. ->  W and Z.
Question 264. Register pair used to indicate memory
  1.     H and L
  2.     D and E
  3.     B and C
  4.     W and Z
 Discuss Question
Answer: Option A. ->  H and L
Question 265. How can we make any bit of a register “1”?
  1.     OR that bit with “0” and remaining bits with “1”.
  2.     AND that bit with “0” and remaining bits with “1”.
  3.     AND that bit with “1” and remaining bits with “0”.
  4.     OR that bit with “1” and remaining bits with “0”.
 Discuss Question
Answer: Option D. ->  OR that bit with “1” and remaining bits with “0”.
Question 266. When RET instruction is executed by any subroutine then
  1.     the PC will be incremented after the execution of the instruction.
  2.     without any operation, the calling program would resume from instruction immediately following the call instruction and also the PC will be incremented after the execution of the instruction.
  3.     without any operation, the calling program would resume from instruction immediately following the call instruction.
  4.     the top of the stack will be popped out and assigned to the PC.
 Discuss Question
Answer: Option D. ->  the top of the stack will be popped out and assigned to the PC.
Question 267. Total numbers of output pins in 8085 microprocessor are
  1.     13
  2.     30
  3.     27
  4.     40
 Discuss Question
Answer: Option C. ->  27
Question 268. How many T-states are required for execution of OUT 80H instruction?
  1.     10
  2.     7
  3.     13
  4.     16
 Discuss Question
Answer: Option A. ->  10
Question 269. Which of the following instruction is not possible in 8085?
  1.     POP D
  2.     POP PSW
  3.     POP 30 H
  4.     POP B
 Discuss Question
Answer: Option C. ->  POP 30 H
Question 270. While CMP B instruction executes,
  1.     no flags will be affected.
  2.     only carry flag will be affected.
  3.     all flags will be affected.
  4.     only carry and zero flags will be affected.
 Discuss Question
Answer: Option C. ->  all flags will be affected.

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