About Microprocessor

Following are some of the multiple choice questions on the Microprocessor with answers that will help the students in developing their knowledge.

Microprocessor MCQ

1. In 8085

  • P flag is set when the result has even parity
  • P flag is set when the result has odd parity
  • P flag is reset when the result has odd parity
  • P flag is reset when the result has even parity

2. The five flags in 8085 are designated as

  • Z, CY, S, P and AC
  • D, Z, S, P, AC
  • Z, C, S, P, AC
  • Z, CY, S, D, AC

3. The minimum number of transistors required to implement a two input AND gate is

  • 2
  • 4
  • 6
  • 8

4. IC 7485 cannot be cascadeD.

  • True
  • False

5. Using DeMorgan’s Theorem we can convert any AND-OR structure into

  • NAND-NAND
  • OR-NAND
  • NAND-NOR
  • NOR-NAND

6. If m is a power of 2, the number of select lines required for an m-input mux is:

  • m
  • 2^m
  • log2 (m)
  • 2*m

7. Which memory has read operation, byte erase, byte write and chip erase?

  • RAM
  • UVEPROM
  • EEPROM
  • Both B and C

8. The character set of Fortran 77 includes lower case alphabets a to z.

  • True
  • False

9. Each instruction in assembly language program has the following fields:Lable fieldMnemonic fieldOperand fieldComment fieldThe correct sequence of these fields is?

  • 1, 2, 3, 4
  • 1, 2, 4, 3
  • 2, 1, 3, 4
  • 2, 1, 4, 3

10. If the number of address bits in a memory is reduced by 2 and the addressability is doubled, the size of the memory (i.e., the number of bits stored in the memory)

  • Doubles
  • Remains unchanged
  • Halves
  • Increases by 2^(address bits)/addressability

11. Assertion (A): Negative values of incremental operator in DO loop are allowed in Fortran 77 but not in earlier versions of Fortran. Reason (R): Fortran 77 has better array facilities than earlier versions of Fortran.

  • Both A and R are correct and R is correct explanation of A
  • Both A and R are correct but R is not correct explanation of A
  • A is correct R is wrong
  • A is wrong R is correct

12. Circuit A is a 1-bit adder; circuit B is a 1 bit multiplier.[Hint: Construct the truth table for the adder and the multiplier]

  • Circuit A has more gates than circuit B
  • Circuit B has more gates than circuit A
  • Circuit A has the same number of gates as circuit B
  • None of the above

13. When .9432 E – 4 is subtracted from .5452 E – 3 in normalized floating point mode

  • None of the numbers is changed
  • .9432 E – 4 is changed to .09432 E – 3 and .5452 E – 3 is not changed
  • .5452 E – 3 is changed to 5.452 E – 4 but .9432 E – 4 is not changed
  • Both Ihe numbers are changed and their exponents are, made equal to -5

14. In 8085, the pins for SID and SOD are

  • 4 and 5 respectively
  • 5 and 4 respectively
  • 3 and 4 respectively
  • 4 and 3 respectively

15. An I/O processor controls the flow of information between

  • Cache memory and I/O devices
  • Main memory and I/O devices
  • Two I/O devices
  • Cache and main memory

16. Of the following circuits, the one which involves storage is

  • RS Latch
  • Mux
  • Nand
  • Decoder

17. MS Access is a DBMS software.

  • True
  • False

18. In Fortran 77 a variable name can contain special characters.

  • True
  • False

19. It is possible to copy a file in the same directory.

  • True
  • False

20. In a computer the data transfer between hard disk and CPU is nearly the same as that between diskette and CPU.

  • True
  • False

21. An e-mail message can be sent to many recipients.

  • True
  • False

22. For the number A[15:0] = 0110110010001111, A[14:13] is ______ A[3:2].

  • Less than
  • Greater than
  • The same as
  • Cannot be determined

23. Internet is a worldwide network of computers where most of the information is freely available.

  • True
  • False

24. Because we wish to allow each ASCII code to occupy one location in memory, most memories are __________ addressable.

  • BYTE
  • NIBBLE
  • WORD (16 bits)
  • DOUBLEWORD (32 bits)

25. We say that a set of gates is logically complete if we can build any circuit without using any other kind of gates. Which of the following sets are logically complete

  • Set of {AND,OR}
  • Set of {EXOR, NOT}
  • Set of {AND,OR,NOT}
  • None of the above

26. Assertion (A): Each memory chip has its own address latch. Reason (R): ALE signal comes out of microprocessor 8085 and goes to memory chip.

  • Both A and R are correct and R is correct explanation of A
  • Both A and R are correct but R is not correct explanation of A
  • A is correct R is wrong
  • A is wrong R is correct

27. For a memory with a 16-bit address space, the addressability is

  • 16 bits
  • 8 bits
  • 2^16 bits
  • Cannot be determined

28. When the write enable input is not asserted, the gated D latch _________ its output.

  • Can not change
  • Clears
  • Sets
  • Complements

29. In a C expression using assignment operators, relational operators and arithmetic operators, the hierarchy of operations (in the absence of parenthesis) is

  • Assignment, relational, arithmetic
  • Relational, assignment, arithmetic
  • Arithmetic, assignment, relational
  • Arithmetic, relational, assignment

30. ‘Burst refresh’ in DRAM is also called

  • Concentrated refresh
  • Distributed refresh
  • Hidden refresh
  • None of the above

31. In 8086 the number of bytes which can be addressed directly is about

  • 1000
  • 10000
  • 100000
  • one million

32. Which of the following is not treated as hexadecimal constant by assembler in 8085?

  • 45 H
  • 6 AFH
  • 234
  • 64 H

33. Which of the following pair of gates can form a latch?

  • A pair of cross coupled OR
  • A pair of cross copled AND
  • A pair of cross coupled NAND
  • A cross coupled NAND/OR

34. DS directive in 8085

  • Forces the assembler to reserve one byte of memory
  • Forces the assembler to reserve a specified number of bytes in the memory
  • Forces the assembler to reserve a specified number of consecutive bytes in the memory
  • None of the above

35. A 37 bit mantissa has an accuracy of

  • 6 decimal places
  • 8 decimal places
  • 10 decimal places
  • 11 decimal places

36. Which of the following is not a general purpose peripheral?

  • I/O port
  • Programmable interrupt controller
  • Programmable CRT controller
  • Programmable interval timer

37. In one’s complement 8 bit representation 11111111 represents

  • +0
  • -0
  • +1
  • -1

38. The number of interrupt lines in 8085 is

  • 2
  • 3
  • 4
  • 5

39. Which of the following is type declaration statement in C?

  • int bar
  • s = s + 1
  • king = horse + 1
  • prin = prin * prin

40. A structure that stores a number of bits taken “together as a unit” is a

  • Gate
  • Mux
  • Decoder
  • Register

41. The timing difference between a slow memory and fast processor can be resolved if

  • Processor is capable of waiting
  • External buffer is used
  • Either A or B
  • Neither A nor B

42. Which of the following is a valid integer constant?

  • 127
  • 127.0
  • 127
  • 125 + 3

43. Which of the following conditions is not allowed in an RS latch?

  • R is asserted, S is asserted
  • R is asserted, S is negated
  • R is negated, S is asserted
  • R is negated, S is negated

44. The forms of IF statements in FORTRAN 77 are called

  • Logical IF and Block IF
  • Logical IF, block IF and arithmetic IF
  • Logic IF, block IF, arithmetic IF and negate IF
  • Logical IF and arithmetic IF

45. In C the keywords are also called

  • Special words
  • Reserved words
  • Class words
  • Character words

46. The operating modes of 8255 A are called

  • Mode 0 and mode 1
  • Mode 0, mode 1 and mode 2
  • Mode 0 and mode 2
  • Mode 0, mode 2 and mode 3

47. If the sign bit of mantissa is 0 and the exponent is increased from a positive to a more negative number the result is

  • A larger floating point number
  • A smaller floating point number
  • Either A or B depending on the actual number
  • A negative floating point number

48. In 8085 which addressing mode is also called inherent addressing?

  • Direct
  • Register
  • Implicit
  • Immediate

49. A real number consists of

  • Integer part
  • Integer part and fraction part
  • Integer part, fraction part along with positive or negative sign
  • None of the above

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