8051 Microcontroller MCQ # 1

8051 Microcontroller MCQ # 1

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Hi all, This is first part of 8051 microcontroller multiple choice questions series. In this MCQ series i have explained top 20 multiple choice questions. If you want to see more questions on 8051 microcontroller then check my next post here.

This series will help in competitive exam like UPPCL- JE, SSC JE, RSEB, RRB and all competitive exam.

Please checkout all multiple choice questions like Microcontroller, Power electronics, PLC and SCADA and 8086 microprocessor here. later I will add more questions in this series. So more update check frequently.

Question 1 Which is not the feature of 16-bit microcontroller?

  • Large program & data memory spaces
  • High speed
  • I/O Flexibility
  • Limited Control Applications

Answer : Limited Control Applications

Question 2 Which is false about microcontroller?

  • Microcontrollers are used to execute a single task within an application.
  • It consists of CPU, RAM, ROM, I/O ports.
  • Its power consumption is high because it has to control the entire system.
  • It is built with CMOS technology

Answer : Its power consumption is high because it has to control the entire system.

Question 3 At what PIN number, there is EA pin which stands for External Access input?

  • PIN 28
  • PIN 29
  • PIN 30
  • PIN 31

Answer : PIN 31

Question 4 Unlike microprocessors, microcontrollers make use of batteries because they have:

  • high power dissipation
  • low power consumption
  • low voltage consumption
  • low current consumption

Answer : low power consumption

Question 5 What is the order decided by a processor or the CPU of a controller to execute an instruction?

  • decode, fetch, execute
  • execute, fetch, decode
  • fetch, execute, decode
  • fetch, decode, execute

Answer : fetch, decode, execute

Question 6 How are the performance and the computer capability affected by increasing its internal bus width?

  • It increases and turns better
  • It decreases
  • Remains the same
  • Internal bus width doesn’t affect the performance in any way

Answer : It increases and turns better

Question 7 How many bytes of bit addressable memory is present in 8051 based microcontrollers?

  • 8 bytes
  • 32 bytes
  • 16 bytes
  • 128 bytes

Answer : 16 byte

Question 8 MOV A, @ R1 will:

  • copy R1 to the accumulator
  • copy the accumulator to R1
  • copy the contents of memory whose address is in R1 to the accumulator
  • copy the accumulator to the contents of memory whose address is in R1

Answer : copy the contents of memory whose address is in R1 to the accumulator

Question 9 How does the microcontroller communicate with the external peripherals / memory?

  • via I/O ports
  • via register arrays
  • via memory
  • all of the above

Answer : via I/O ports

Question 10 What is the file extension is used to load in a microcontroller to execute an instruction?

  • .doc
  • .c
  • .txt
  • .hex

Answer : .hex

Question 11 What is internal RAM memory of 8051 microprocessor?

  • 32 bytes
  • 64 bytes
  • 128 bytes
  • 256 bytes

Answer : 128 bytes

Question 12 When the microcontroller execute some arithmetic operations, then the flag bit of which register are affected ?

  • PSW
  • SP
  • DPTR
  • PC

Answer : PSW

Question 13 8051 microcontroller is designed by Intel in?

  • 1980
  • 1981
  • 1982
  • 1983

Answer : `1981

Question 14 Why is CHMOS technology preferred over HMOS technology for designing the devices of MCS-51 family?

  • Due to higher noise immunity
  • Due to lower power consumption
  • Due to higher speed
  • All of the above

Answer : Due to lower power consumption

Question 15 Which among the below mentioned devices of MCS-51 family does not possess two 16 -bit timers/counters?

  • 8031
  • 8052
  • 8751
  • All of the above

Answer : All of the above

Question 16 Which operations are performed by stack pointer during its incremental phase?

  • Push
  • Pop
  • Return
  • All of the above

Answer : Push

Question 17 Which of the following register usually store the output generated by ALU in several arithmetic and logical operations?

  • Special Function Register
  • Timer Register
  • Accumulator
  • Stack Pointer

Answer : Accumulator

Question 18 8051 series has how many 16 bit registers?

  • 2
  • 3
  • 1
  • 0

Answer : 2

Question 19 8051 microcontrollers are manufactured by which of the following companies?

  • Atmel
  • Philips
  • Intel
  • All of the mentioned

Answer : All of the mentioned

Question 20 Which IO Port can be used for higher address byte with addresses A8-A15?

  • PORT1
  • PORT0
  • PORT3
  • PORT2

Answer : PORT2


FAQ

What is Microcontroller?

Microcontroller is a combination of two words micro and controller, Micro means small in size and controller means a device that can control the operation of any system. So we can say that a microcontroller is a microprocessor with integrated peripherals.

What is the order decided by a processor or the CPU of a controller to execute an instruction?

First instruction is fetched from Program Memory, then fetching, instruction is decoded to generate control signals to perform the intended task. After decoding, instruction is executed and the complete intended task of that particular instruction.

How are the performance and the computer capability affected by increasing its internal bus width?

As the bus width increases, the number of bits carried by bus at a time increases as a result of which the total performance and computer capability increases.

How many bytes of bit addressable memory is present in 8051 based microcontrollers?

8051 microcontrollers have 16 bytes of bit addressable memory.

How many timers/counter 8051 microcontroller have?

8051 Microcontroller 8051 have 2 timers/counter.

When was intel design first 8051 microcontroller?

8051 microcontroller is designed by Intel in 1981. It is an 8-bit microcontroller

Why is CHMOS technology preferred over HMOS technology for designing the devices of MCS-51 family?

Micro Controllers are made by using the concept of VLSI technology. So here, CMOS based logic gates are coupled together by this technique that consumes low power.

8051 series has how many 16 bit registers?

8051 microcontroller has two 16 bit registers DPTR and PC.

8051 microcontrollers are manufactured by which of the following companies?

8051 microcontrollers are manufactured by Intel, Atmel, Philips/Signetics, Infineon, Dallas Semi/Maxim.

Which IO Port can be used for higher address byte with addresses A8-A15?

PORT2 : This port can be used for higher address byte with addresses A8-A15. When no memory is added then this port can be used as a general input/output port similar to Port 1.

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