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  • Question

  • 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

  • Correct Answer
  • A is correct R is wrong 

    Explanation
    The number of addressing modes is five.

    Microprocessors problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. Z flag is reset if an ALU operation results in 0.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. Which of the following is not an integer constant?

    • Options
    • A. 0
    • B. -8
    • C. +1074
    • D. -8.1
      • Discuss
    • 5. In which computer language is 'break' statement used

    • Options
    • A. Fortran 77
    • B. Pascal
    • C. C
    • D. none of the above
      • Discuss
    • 6. 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
    • 7. Consider the following program in Pascal

      X = 2.57
      X = (X + 0.06) * 10
      I = TRUNC (X)
      X = I
      X = X / 10.0

      The final value of X would be

    • Options
    • A. 2
    • B. 2.6
    • C. 2.63
    • D. 26.3
      • Discuss
    • 8. EEPROM permits

    • Options
    • A. read operation only
    • B. read and byte erase operations
    • C. read, byte erase and byte write operations
    • D. read, byte erase, byte write and chip erase operations
      • Discuss
    • 9. If A = 20 and B = - 7 in PASCAL, A mod B =

    • Options
    • A. 6
    • B. 2
    • C. - 1
    • D. 3
      • Discuss
    • 10. A 256 x 4 EPROM has

    • Options
    • A. 8 address pins and 4 data pins
    • B. 8 address pins and 8 data pins
    • C. 4 address pins and 8 data pins
    • D. 4 address pins and 4 data pins
      • Discuss

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