Microprocessor MCQ

Test your knowledge with important Microprocessor MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Microprocessor MCQs at Bissoy

• Which is of the following is true about SPHL instruction?
  ক

  It uses indexed addressing mode

  খ

  It is a 3-byte instruction

  গ

  It requires three T-states

  ঘ

  Contents of HL pair is moved to SP
• Which of the following is a register-indirect addressing mode instruction set?
  ক

  LDA 2700H

  খ

  ADI 36H

  গ

  DAA

  ঘ

  LDAX B
• Which of the following is a 2-word instruction set?
  ক

  LDA 2500H

  খ

  MOV A, B

  গ

  IN 01H

  ঘ

  JMP 2085H
• Which of the following interfacing IC is a DMA controller?
  ক

  8257/37

  খ

  8155

  গ

  8253/54

  ঘ

  8279
• When data required for instruction is present inside the register of a microprocessor then which of the following addressing mode is used?
  ক

  Indexed

  খ

  Register

  গ

  Relative

  ঘ

  Direct
• Which of the following is not correct about HLT instruction?
  ক

  It is a machine control instruction

  খ

  It is used to start the execution of the program

  গ

  PC is disconnected from the address bus

  ঘ

  A reset interrupt is required to come out of halt state
• Conditional instructions are independent of which of the following flag?
  ক

  Z

  খ

  AC

  গ

  CY

  ঘ

  P
• For how many times per instruction, the content of the program counter is placed on the address bus?
  ক

  One time

  খ

  Two times

  গ

  Depends on the memory capacity of the processor

  ঘ

  Depends on the length of the instruction
• Suppose registers ‘A’ and ‘B’ contain 50H and 40H respectively. After instruction MOV A, B, what will be the contents of registers A and B?
  ক

  40H, 40H

  খ

  50H, 40H

  গ

  50H, 50H

  ঘ

  60H, 40H
• What does a loader do in a microprocessor?
  ক

  Converts hexadecimal code to binary

  খ

  Converts decimal to binary

  গ

  Increments the content of the program counter by 1

  ঘ

  Decodes an opcode
• DAA instruction is used to perform which type of addition?
  ক

  BCD addition

  খ

  Excess-3 addition

  গ

  Binary addition

  ঘ

  Octal addition
• Which is of the following is true about STA instruction?
  ক

  It uses immediate addressing mode

  খ

  It is a 3-byte instruction

  গ

  It required three machine cycles

  ঘ

  Accumulator is loaded with the content of memory
• Which of the following is false about LDA instruction?
  ক

  It is a 3-byte instruction

  খ

  It uses indirect addressing mode

  গ

  It has 13 T-states

  ঘ

  It doesn’t affect any flags
• Which of the following is true about MOV A, B instruction?
  ক

  It means move the content of register A to register B

  খ

  It uses immediate addressing mode

  গ

  It doesn’t affect the flag register

  ঘ

  It is a 2-byte instruction
• How many address lines are required to connect a 4 KB RAM to a microprocessor?
  ক

  10

  খ

  16

  গ

  12

  ঘ

  20
• Which of the following is true about stack pointer?
  ক

  Stack pointer contains the address of the top of the stack memory

  খ

  Stack pointer is an 8-bit register

  গ

  Stack pointer stores data permanently

  ঘ

  Stack pointer is initialized after stack operation
• What is the vectored address of RST-5?
  ক

  0010 H

  খ

  0032 H

  গ

  0028 H

  ঘ

  0030 H
• Which of the following is a software interrupt?
  ক

  TRAP

  খ

  INTR

  গ

  RST-6.5

  ঘ

  RST-5
• If a 90 GB memory has to be connected to a microprocessor, minimum how many address lines are required?
  ক

  36

  খ

  39

  গ

  32

  ঘ

  37
• What is stored in the H & L general-purpose register?
  ক

  Opcode

  খ

  Address of memory

  গ

  Address of next instruction

  ঘ

  Temporary data
• Which of the following addressing mode is used by 8085 microprocessor for array and list operations?
  ক

  Base-Register

  খ

  Direst

  গ

  Indexed

  ঘ

  Immediate
• Which of the following is a non-vectored input?
  ক

  TRAP

  খ

  RST-7.5

  গ

  RST-6.5

  ঘ

  INTR
• Which of the following is not true about 8085 microprocessor?
  ক

  It is an 8-bit microprocessor

  খ

  It is a 40 pin DIP chip

  গ

  It is manufactured using PMOS technology

  ঘ

  It has 16 address lines
• What is the word length of the Pentium-II microprocessor?
  ক

  8-bit

  খ

  32-bit

  গ

  64-bit

  ঘ

  16-bit
• A memory connected to a microprocessor has 20 address lines and 16 data lines. What will be the memory capacity?
  ক

  8 KB

  খ

  2 MB

  গ

  16 MB

  ঘ

  64 KB
• Which of the following register is not used in opcode fetch operations?
  ক

  Program counter

  খ

  Memory address register

  গ

  Memory data register

  ঘ

  Flag register
• Which of the following is not a condition flag?
  ক

  Trap flag

  খ

  Auxiliary carry flag

  গ

  Parity flag

  ঘ

  Zero flag
• Which of the following is not a status flag in microprocessor?
  ক

  Overflow flag

  খ

  Direction flag

  গ

  Interrupt flag

  ঘ

  Index flag
• How many address lines are present in 8086 microprocessor?
  ক

  16

  খ

  20

  গ

  32

  ঘ

  40
• What does a microprocessor understand after decoding opcode?
  ক

  Perform ALU operation

  খ

  Go to memory

  গ

  Length of the instruction and number of operations

  ঘ

  Go to the output device