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. Whichof the following is the fastest ADC

  • DUAL SLOPE
  • successive approximation
  • flash
  • single slope

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

  • 2
  • 4
  • 6
  • 8

5. In microprocessor based system DMA refers to

  • direct memory access for microprocessor
  • direct memory access for the user
  • direct memory access for the I/O device
  • None of these

6. Which of the data transfer is not possible in microprocessor

  • memory to accumulator
  • accumulator to memory
  • memory to memory
  • Both A & B

7. DMA is used between

  • microprocessor and I/O
  • microprocessor and memory
  • memory and I/O
  • None of these

8. A microprocessor with a 12-bit address bus will be able to access

  • 1 K bytes
  • 4 K bytes
  • 8 K bytes
  • Both A & B

9. Basic steps of execution of an instruction is

  • fetch → execute → decode
  • decode → fetch → execute
  • execute → fetch → decode
  • fetch → decode → execute

10. A microprocessor is ALU

  • and control unit on a single chip.
  • and memory on a single chip.
  • register unit and I/O device on a single chip.
  • register unit and control unit on a single chip.

11. The program counter in a 8085 micro-processor is a 16-bit register, because

  • It counts 16-bits at a time
  • There are 16 address lines
  • It facilitates the user storing 16-bit data temporarily
  • None of these

12. Which language could be used for programming an FPGA.

  • Verilog
  • VHDL
  • Both A and B
  • None of these

13. FPGA means

  • Field Programmable Gate Array
  • Forward Programmable Gate Array
  • Forward Parallel Gate Array
  • All of above

14. The first task of DOS operating system after loading into the memory is to use the filecalled___________

  • HIMEM.SYS
  • CONFIG.SYS
  • AUTOEXEC.BAT
  • All of above

15. The first modern computer was called_____________

  • FLOW-MATIC
  • UNIVAC-I
  • ENIAC
  • All of above

16. Signal voltage ranges for a logic high and for a logic low in RS-232C standard are

  • Low = 0 volt to 1.8 volt, high = 2.0 volt to 5 volt
  • Low =-15 volt to –3 vol, high = +3 volt to +15 volt
  • Low = +3 volt to +15 volt, high = -3 volt to -15 volt
  • All of above

17. EPROM is generally erased by using

  • Ultraviolet rays
  • infrared rays
  • 12 V electrical pulse
  • None of these

18. Pseudo instructions are basically

  • false instructions
  • instructions that are ignored by the microprocessor
  • assembler directives
  • instructions that are treated like comments

19. Which are the four categories of registers:

  • General‐ purpose register
  • Pointer or index registers
  • Segment registers
  • All of these

20. The microcomputer system by using the ____device interface

  • Input
  • Output
  • Both a and b
  • None of these

21. The ____ place the data from a register onto the data bus.

  • CPU
  • ALU
  • Both a and b
  • None of these

22. MSD stands for:

  • Least significant digit
  • Most significant digit
  • Medium significant digit
  • All of above

23. The left side of any binary number is called:

  • Least significant digit
  • Most significant digit
  • Medium significant digit
  • All of above

24. A nibble can be represented in the from of:

  • Octal digit
  • Decimal
  • Hexadecimal
  • Both A & B

25. The 16 bit register is separated into groups of 4 bit where each groups is called:

  • BCD
  • Nibble
  • Half byte
  • All of above

26. In which form CPU provide output:

  • Computer signals
  • Digital signals
  • Metal signals
  • None of these

27. Which is the brain of computer ?

  • ALU
  • CPU
  • MU
  • None of these

28. A/n …. Device is any device that provides information, which is sent to the CPU.

  • Input
  • Output
  • CPU
  • Both A & B

29. The term gigabyte refers to

  • 1024 bytes
  • 1024 kilobytes
  • 1024 megabytes
  • All of above

30. To locate a data item for storage is

  • Field
  • Feed
  • Database
  • Fetch

31. Which of the following terms is the most closely related to main memory?

  • Non volatile
  • Permanent
  • Control unit
  • Temporary

32. The ALU of a computer normally contains a number of high speed storage element called

  • Semiconductor memory
  • magnetic disk
  • Hard disks
  • Registers

33. The instructions for starting the computer are house on

  • Random access memory
  • CD‐Rom
  • Read only memory chip
  • All of above

34. The metal disks, which are permanently housed in, sealed and contamination free containers are called

  • Hard disks
  • Floppy disk
  • Winchester disk
  • None of these

35. An error in computer data is called

  • Chip
  • storage device
  • CPU
  • Bug

36. A 32 bit microprocessor has the word length equal to

  • 2 byte
  • 32 byte
  • 8 byte
  • 4 byte

37. Which of the following memories allows simultaneous read and write operations?

  • ROM
  • RAM
  • EPROM
  • None of these

38. The secondary storage devices can only store data but they cannot perform

  • Arithmetic Operation
  • Logic operation
  • Fetch operations
  • Either of the above

39. What is the responsibility of the logical unit in the CPU of a computer?

  • To produce result
  • To do math's works
  • To control flow of information
  • To compare numbers

40. What are the three decisions making operations performed by the ALU of a computer?

  • Greater than
  • Less than
  • Equal to
  • All of the above

41. Before a disk can be used to store data. It must be…….

  • Formatted
  • Reformatted
  • Addressed
  • All of above

42. Which of the following items are examples of storage devices?

  • Floppy / hard disks
  • CD‐ROMs
  • Tape devices
  • All of the above

43. Most important advantage of an IC is its

  • Easy replacement in case of circuit failure
  • Extremely high reliability
  • Reduced cost
  • low powers consumption

44. An integrated circuit is

  • A complicated circuit
  • An integrating device
  • Much costlier than a single transistor
  • Fabricated on a tiny silicon chip

45. The first microprocessor built by the Intel Corporation was called

  • 8008
  • 8080
  • 4004
  • 8800

46. One of the main feature that distinguish microprocessors from micro‐computers is

  • Words are usually larger in microprocessors
  • Words are shorter in microprocessors
  • Microprocessor does not contain I/O devices
  • exactly the same as the machine cycle time

47. Which of the following memories needs refresh?

  • SRAM
  • DRAM
  • ROM
  • None of these

48. Which of the following memory medium is not used as main memory system?

  • Magnetic core
  • Semiconductor
  • Magnetic tape
  • Both A & B

49. Which of the following is used as a primary storage device?

  • Magnetic drum
  • PROM
  • Floppy disk
  • All of above

50. The language that the computer can understand and execute is called

  • Machine language
  • Application software
  • System program
  • None of these

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