MicroController MCQ Questions

MicroController MCQ Questions | Freshers & Experienced

Sharad Jaiswal
01st Jun, 2021

Practice best MicroController MCQ Questions, which cover the latest and important topics of MicroController 8051, so you can perform best in interviews, competitive exams, and placement drives. this Microcontroller MCQ Quiz contains 35+ microcontroller multiple-choice questions and answers, which are asked various times in competitive exams or interviews. when you choose an option for these questions, the green color belongs to the right option & the red color belongs to the wrong option.

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MicroController MCQ Questions

MicroController MCQ Questions

1) How many microcontrollers classified on the basis of internal bus width?

A. 8,16 bits
B.4,16,32 bits
C.4,8,16,32 bits
D.8,16,32,64 bits

2) What is the full form of CISC and RISC?

A. Complete Instruction Set Computer, Reduced Instruction Set Computer
B.Complex Instruction Set Computer, Reliable Instruction Set Computer
C.Complex Instruction Set Computer, Reduced Instruction Set Computer
D.Complete Instruction Set Computer, Reliable Instruction Set Computer

3) What is the file extension that is loaded in a microcontroller for executing any instruction?

A. .txt
B..doc
C..c
D..hex

4) Which of the following companies are made 8051 series of microcontrollers?

A. Atmel
B.Philips
C.Atmel & Philips
D.None of the mentioned

5) AT89C2051 has RAM of:

A. 64 bytes
B.128 bytes
C.512 bytes
D.256 bytes

6) How many 16 bit registers in 8051 series?

A. 0
B.3
C.2
D.1

7) When 8051 wakes up then 0x00 is loaded to which register?

A. DPTR
B.PC
C.PSW
D.SP

8) On power up, the 8051 uses which RAM locations for register R0- R7?

A. 00-7F
B.00-2F
C.00-07
D.00-0F

9) The address space of the 8051 is divided into four distinct area such as internal data, external data, internal code, and external code.

A. True
B.False

10) How many interrupt sources can handle the 8051?

A. 5
B.2
C.4
D.7

11) A label is used to name a single line of code.

A. True
B.False

12) The total amount of external code memory that can be interfaced to the 8051 is:

A. 32K
B.128K
C.64K
D.256K

13) A HIGH on which pin resets the 8051 microcontroller?

A. PSEN
B.RSET
C.RESET
D.RST

14) Which of the following operations are performed by stack pointer during its incremental phase?

A. Pop
B.Return
C.Push
D.All of the above

15) Which kind of instructions usually affect the program counter?

A. Pop
B.Call & Return
C.Call & Jump
D.Push

16) Which timer is attributed to the register pair of RCAP2H & RCAP2L for capture mode operation?

A. Timer 1
B.Timer 2
C.Timer 3
D.Timer 0

17) Which version of MCS-51 requires the essential connection of external clock source to XTAL2 in addition to the XTAL1 connectivity to ground level?

A. CMOS
B.HMOS
C.CHMOS
D.All of the above

18) Which of the following counting rate of a machine cycle in correlation to the oscillator frequency for timers?

A. 1 / 12
B.1 / 20
C.1 / 15
D.1 / 10

19) Which special function register play a vital role in the timer/counter mode selection process by allocating the bits in it?

A. SCON
B.TCON
C.TMOD
D.PCON

20) What are the two instruction set architecture (ISA) classifications?

A. CISC & RISC
B.CISC & VISC
C.SIDC & BIDC
D.None of these

21) Which is the first microcontroller?

A. TMS10000
B.TMS100
C.TMS1000
D.None of these

22) Who developed the first microcontroller?

A. Gary Boone
B.Michael
C.David
D.None of the above

23) Which microcontroller is used in mobile phones?

A. ARM7
B.ARM8
C.ARM6
D.None of these

24) Which category of microcontrollers acquire the complete hardware configuration on its chip so as to run the particular application ?

A. External Memory Microcontrollers
B.Embedded Memory Microcontrollers
C.Both a & b
D.None of the above

25) How are the port pins of microcontroller are calculated for time-multiplexing types of display?

A. 4 – number of digits to be dispalyed .
B.4 + number of digits to be displayed
C.4 x number of digits to be displayed
D.4 raised to the number of digits to be displayed

26) What is internal ram memory of 8051 microprocessor?

A. 32 bytes
B.64 bytes
C.128 bytes
D.256 bytes

27) Register that is used to holds the memory address of the next instruction to be executed is................

A. Control Unit
B.Program Memory
C.Program Counter
D.Instruction decoder

28) Which of the following commands are used for addressing the off-chip data and associated codes respectively by data pointer?

A. MOVX & MOVC
B.MOVC & MOVY
C.MOVZ & MOVA
D.MOVY & MOVB

29) What is true about microcontroller?

A. A microcontroller is a small and low-cost microcomputer
B.It is designed to perform the specific tasks of embedded systems
C.Microcontroller consists of the processor, the memory, Serial ports, peripherals.
D.All of the Above

30) Which register usually store the output generated by ALU in several arithmetic and logical operations?

A. Stack Pointer
B.Accumulator
C.Timer Register
D.Special Function Register

31) Which of the following is the function of the TMOD register?

A. It is used to interrupt the timer.
B.TMOD register is used to load the count of the timer.
C.TMOD register is used to set different timer’s or counter’s to their appropriate modes.
D.TMOD register is the destination or the final register where the result is obtained after the operation of the timer.

32) Which is criteria for selecting a microcontroller?

A. Reliability
B.Faster Speed
C.Both A & B
D.None of the above

33) What is the function of the scon register?

A. To control SBUF and SMOD registers
B.To program the start bit, stop bit, and data bits of framing
C.Both A & B
D.None of the above

34) What is the default value of stack pointer once after the 8051 microcontroller undergoes the reset condition?

A. 00H
B.07H
C.08H
D.09H

35) Which pin of the LCD is used for adjusting its contrast?

A. Pin no 1
B.Pin no 2
C.Pin no 3
D.Pin no 4

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