Quiz  /  Microcontroller Class 10 MCQ Questions With Answers

  • 1. 
    EA‾\overline{EA}EA Pin is held _______ during external ROM access

  • LOW
  • HIGH

  • 2. 
    Find content of Accumulator ?MOV A , #4EHCPL AA = ?

  • 22H
  • B1H
  • 21H
  • 24H

  • 3. 
    After MUL AB , lower byte and higher byte result stored in following respectively

  • B reg, Acc
  • Acc, B reg
  • B reg
  • Acc

  • 4. 
    Pin number of RESET pin

  • 40
  • 9
  • 20
  • 21

  • 5. 
    After execution of following instructions what will be content of Accumulator ? And also tell which flag will set?MOV A,#08HMOV B,#09HADD A,B

  • 12H, CY
  • 11H, CY
  • 11H , AC
  • 12H, AC

  • 6. 
    Bit addressable location available in RAM

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

  • 7. 
    How many timers in 8051?

  • 1
  • 2
  • 3
  • 4

  • 8. 
    Which file type is finally burnt in the ROM

  • .abs
  • .asm
  • .hex
  • .lst

  • 9. 
    MOV A,#32H is an example of __________ addressing mode

  • Indirect
  • Direct
  • Register
  • Immediate

  • 10. 
    Each register bank consist of how many registers?

  • 10
  • 8
  • 4
  • 16

  • 11. 
    Which of the following are 8 bit registers?

  • PSW
  • ACCUMULATOR (A reg)
  • DPTR
  • Both A & B

  • 12. 
    Timer pins T0 & T1 are connected to which pin respectively?

  • 10 (P3.0) & 11 (P3.1)
  • 12 (P3.2) & 13 (P3.3)
  • 14 (P3.4) & 15 (P3.5)
  • 16 (P3.6) & 17 (P3.7)

  • 13. 
    CJNE stands for

  • Comment & Jump if Number Enable
  • Compare & Jump if Not Equal
  • Carry bit Just if Number Equal

  • 14. 
    Full form of DJNZ ?

  • Decrease Just Number Zero
  • Decrement Jump Not equal to Zero
  • Data Jump New address if Zero
  • Delete and Jump to Number Zero

  • 15. 
    Which port(s) is/are used as address lines when accessing external memory

  • Port 0
  • Port 2
  • Port 0 & port 2
  • Port 1 & Port 3

  • 16. 
    Which port is used for only input/output operation?

  • port 3
  • port 2
  • port 1
  • port 0

  • 17. 
    Microcontroller is

  • without memory
  • with memory

  • 18. 
    Pin number of Vcc?

  • 20
  • 40
  • 1`
  • 10

  • 19. 
    Find CY = ?MOV A , # 09HRRC A

  • 0
  • 1
  • NONE OF THIS

  • 20. 
    Which pins are used to read/ write data from/to MC?

  • RXD , TXD
  • T0 , T1
  • WR ‾\overline{WR\ }WR , RD‾\overline{RD}RD

  • 21. 
    The TMOD register is a(n)

  • 4 Bit register
  • 8 bit register
  • 16 bit register

  • 22. 
    The timers of the 8051 are

  • 4 bit
  • 8 bit
  • 16 bit
  • 32 bit

  • 23. 
    Which register bank will select afterCLR PSW.4SETB PSW.3

  • 3
  • 2
  • 1
  • 0

  • 24. 
    Number of binary 1's in accumulator is odd then parity bit of PSW will be __________

  • SET
  • RESET
  • -
  • NONE OF THIS

  • 25. 
    How many register bank in 8051?

  • 1
  • 2
  • 3
  • 4

  • 26. 
    How many types of addressing mode are there in 8051?

  • 5
  • 4
  • 3
  • 2

  • 27. 
    NOP means

  • No operation
  • No operands
  • No object
  • New operation

  • 28. 
    Addressing is ___________

  • method of specifying the address in instruction
  • method of specifying the data in instruction
  • method of specifying the memory
  • method of specifying the operation in instruction

  • 29. 
    Assembly language instruction consists of ______ fields

  • 4
  • 3
  • 2
  • 1
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