MCQ on Microprocessor [PDF] 70 Most Important Question

MCQ on Microprocessor. CPU chip questions and answer for computer competitive exams and interview with Question Bank pdf. These questions asked in many previous years exams.

MCQ on Microprocessor

1. FPGA means

a) Field Programmable Gate Array

b) Forward Programmable Gate Array

c) Forward Parallel Gate Array

d) Field Parallel Gate Array

Ans. a

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

a) Verilog


c) Both A and B

d) Heetson

Ans. c

3. What is mean by ALU

a) Arithmetic logic upgrade

b) Arithmetic logic unsigned

c) Arithmetic Local unsigned

d) Arithmetic logic unit

Ans. d

4. In 8085 microprocessor, the RST6 instruction transfer programme execution to following location

a) 0030H       

b) 0024H

c) 0048H       

d) 0060H

Ans. a

5. HLT opcode means

a) load data to accumulator

b) store result in memory

c) load accumulator with contents of register

d) end of program

Ans. d

6. What is SIM?

a) Select interrupt mask     

b) Sorting interrupt mask

c) Set interrupt mask          

d) None of these

Ans. c

7. A field programmable ROM is called

a) MROM      

b) PROM       

c) FROM       


Ans. b

8. The length of bus cycle in 8086/8088 is four clock cycle, T1, T2, T3, T4 and an indeterminate number of wait clock cycles denoted by Tw. The wait states are always inserted between

a) T1& T2       

b) T2& T3       

c) T3& T4        

d) T4& T5


9. Which one of the following circuits transmits two messages simultaneously in one direction

a) Duplex      

b) Diplex       

c) Simplex    

d) Quadruplex

Ans. b

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

a) It counts 16 bits at a time

b) There are 16 address lines

c) It facilitates the user storing 16 bit data temporarily

d) It has to fetch two 8 bit data at a time

Ans. b

11. A microprocessor is ALU __________

a) and control unit on a single chip                     

b) and memory on a single chip

c) register unit and I/O device on a single chip 

d) register unit and control unit on a single chip

Ans. d

12. In intel 8085A microprocessor ALE singnal is made high to

a) Enable the data bus to be used as low order address bus

b) To latch data D0-D7 from data bus

c) To disable data bus

d) To achieve all the function listed above

Ans. a

13. Which of the following statements for intel 8085 is correct?

a) Program counter (PC) specifies the address of the instruction last executed

b) PC specifies the address of the instruction being executed

c) PC specifies the address of the instruction to be executed

d) PC specifies the number of instructions executed so far

Ans. c

14. A good assembly language programmer should use general purpose registers rather than memory in maximum possible ways for data processing. This is because:

a) Data processing with registers is easier than with memory

b) Data processing with memory requires more instructions in the program than that with registers

c) Of limited set of instructions for data processing with memory

d) Data processing with registers takes fewer cycles than that with memory

Ans. d

15. Which one of the following is not correct?

a) Bus is a group of wires

b) Bootstrap is a technique or device for loading first instruction

c) An instruction is a set of bits that defines a computer operation

d) An interrupt signal is required at the start of every program

Ans. d

16. The processor status word of 8085 microprocessor has five flags namely:

a) S, Z, AC, P, CY

b) S, OV, AC, P, CY

c) S, Z, OV, P, CY

d) S, Z, AC, P, OV

Ans. a

17. What are the sets of commands in a program which are not translated into machine instructions during assembly process, called?

a) Mnemonics          

b) Directives             

c) Identifiers             

d) Operands

Ans. b

18. In an intel 8085A, which is the first machine cycle of an instruction?

a) An op-code fetch cycle

b) A memory read cycle

c) A memory write cycle

d) An I/O read cycle

Ans. a

19. Both the ALU and control section of CPU employ which special purpose storage location?

a) Buffers

b) Decoders

c) Accumulators

d) Registers

Ans. c

20. In an intel 8085A microprocessor, why is READY signal used?

a) To indicate to user that the microprocessor is working and is ready for use.

b) To provide proper WAIT states when the microprocessor is communicating with a slow peripheral device

c) To slow down a fast peripheral device so as to communicate at the microprocessor’s device.

d) Hard drive

Ans. b

21. The register which holds the information about the nature of results of arithmetic and logic operations is called as

a) Accumulator

b) Condition code register

c) Flag register

d) process status register

Ans. c

22. A bus connected between the CPU and main memory that permits transfer of information between main memory and the CPU is known as

a) DMA bus

b) Memory bus

c) Address bus

d) control bus

Ans. b

23. How many segments are there in 8086?

a) 6

b) 4

c) 3

d) 2

Ans. b

24. The first microprocessor to include virtual memory in the intel microprocessor family is

a) 80286

b) 80386

c) 80486

d) Pentium

Ans. a

25. Total number of instructions in 8086 microprocessor assembly language is

a) 244

b) 254

c) 246

d) 247

Ans. c

26. In microprocessor based system I/O ports are used to interface

a) the I/O devices and memory chips

b) the I/P device only

c) the O/P devices only

d) all the I/O devices

Ans. d

27. The instruction set of a microprocessor

a) is specified by the manufacturers

b) is specified by the user

c) cannot be changed by the user

d) is stored inside the microprocessor

Ans. a

28. The stack pointer

a) resides in RAM

b) resides in ROM

c) resides in microprocessor

d) may be in RAM or ROM

Ans. c

29. Accumulator based microprocessor example are:

a) Intel 8085

b) Motorola 6809

c) A and B

d) None of these

Ans. c

30. How many buses are connected as part of the 8085A microprocessor?

a) 2

b) 3

c) 5

d) 8

Ans. b

31. The microprocessor can read/write 16 bit data from or to ____

a) Memory                

b) I/O device

c) Processor             

d) Processor

Ans. a

32. In 8086 microprocessor, the address bus is ____ bit wide

a) 10 bit         

b) 12 bit

c) 16 bit         

d) 20 bit

Ans. d

33. The work of EU is ______

a) Encoding

b) Decoding

c) Processing

d) Calculation

Ans. b

34. The SF is called as ______

a) Single flag

b) sign flag

c) service flag

d) super flag

Ans. b

35. The OF is called as ______

a) Over flow flag

b) overdue flag

c) operation flag

d) option flag

Ans. a

36. The IF is called as ______

a) Initial flag

b) interrupt flag

c) indication flag

d) inner flag

Ans. b

37. The BP is indicated by ____

a) Base pointer

b) binary pointer

c) bit pointer

d) digital pointer

Ans. a

38. The SS is called as _____

a) Single stack

b) Stack segment

c) Sequence stack

d) random stack

Ans. b

39. The index register are used to hold ______

a) Memory register              

b) Offset address

c) segment memory            

d) offset memory

Ans. a

40. The DS is called as _____

a) Data segment      

b) digital segment

c) divide segment    

d) decode segment

Ans. a

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