Microprocessor MCQ Answers

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Microprocessor MCQ Answers

This is the microprocessor mcq with 100% correct answers:

Q1. Which is of the following is true about STA instruction?

1. It uses immediate addressing mode
2. It is a 3-byte instruction
3. It required three machine cycles
4. Accumulator is loaded with the content of memory

Q2. DAA instruction is used to perform which type of addition?

1. BCD addition
2. Excess-3 addition
3. Binary addition
4. Octal addition

Q3. What does a loader do in a microprocessor?

1. Converts hexadecimal code to binary
2. Converts decimal to binary
3. Increments the content of the program counter by 1
4. Decodes an opcode

Q4. 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?

1. 40H, 40H
2. 50H, 40H
3. 50H, 50H
4. 60H, 40H

Q5. For how many times per instruction, the content of the program counter is placed on the address bus?

1. One time
2. Two times
3. Depends on the memory capacity of the processor
4. Depends on the length of the instruction

Q6. Conditional instructions are independent of which of the following flag?

1. Z
2. AC
3. CY
4. P

Q7. Which of the following is not correct about HLT instruction?

1. It is a machine control instruction
2. It is used to start the execution of the program
3. PC is disconnected from the address bus
4. A reset interrupt is required to come out of halt state

Q8. When data required for instruction is present inside the register of a microprocessor then which of the following addressing mode is used?

1. Indexed
2. Register
3. Relative
4. Direct

Q9. Which of the following interfacing IC is a DMA controller?

1. 8257/37
2. 8155
3. 8253/54
4. 8279

Q10. Which of the following is a 2-word instruction set?

1. LDA 2500H
2. MOV A, B
3. IN 01H
4. JMP 2085H

Q11. Which of the following is a register-indirect addressing mode instruction set?

1. LDA 2700H
2. ADI 36H
3. DAA
4. LDAX B

Q12. Which is of the following is true about SPHL instruction?

1. It uses indexed addressing mode
2. It is a 3-byte instruction
3. It requires three T-states
4. Contents of HL pair is moved to SP

Q13. Which of the following is not a microprocessor?

1. Z8000
2. Motorola 6809
3. Zilog Z8
4. PIC1x

Q14. Which of the following is not a property of TRAP interrupt in microprocessor?

1. It is a non-maskable interrupt
2. It is of highest priority
3. It uses edge-triggered signal
4. It is a vectored interrupt

Q15. Which of the following is a property of RST 7.5 interrupt?

1. It is a non-maskable interrupt
2. It has 3rd highest priority
3. It uses level-triggered signal
4. Its vectored address is 003C H

Q16. Which of the following flag is used to mask INTR interrupt?

1. zero flag
2. auxiliary carry flag flag
3. interrupt flag
4. sign flag

Q17. Which of the following is a special-purpose register of microprocessor?

1. Program counter
2. Instruction register
3. Accumulator
4. Temporary register

Q18. Which of the following circuit is used as a special signal to demultiplex the address bus and data bus?

1. Priority Encoder
2. Decoder
3. Address Latch Enable
4. Demultiplexer

Q19. How many flip-flops are there in a flag register of 8085 microprocessor?

1. 4
2. 5
3. 7
4. 10

Q20. Which of the following flag condition is used for BCD arithmetic operations in microprocessor?

1. Sign flag
2. Auxiliary carry flag
3. Parity flag
4. Zero flag

Q21. Whenever a non-maskable interrupt occurs in 8085 microprocessor, which of the following data line contains the data?

1. 2C H
2. 3C H
3. 36 H
4. 24 H

Q22. What does a microprocessor understand after decoding opcode?

1. Perform ALU operation
2. Go to memory
3. Length of the instruction and number of operations
4. Go to the output device

Q23. How many address lines are present in 8086 microprocessor?

1. 16
2. 20
3. 32
4. 40

Q24. Which of the following is not a status flag in microprocessor?

1. Overflow flag
2. Direction flag
3. Interrupt flag
4. Index flag

Q25. Which of the following is not a condition flag?

1. Trap flag
2. Auxiliary carry flag
3. Parity flag
4. Zero flag

Q26. Which of the following register is not used in opcode fetch operations?

1. Program counter
2. Memory address register
3. Memory data register
4. Flag register

Q27. A memory connected to a microprocessor has 20 address lines and 16 data lines. What will be the memory capacity?

1. 8 KB
2. 2 MB
3. 16 MB
4. 64 KB

Q28. What is the word length of the Pentium-II microprocessor?

1. 8-bit
2. 32-bit
3. 64-bit
4. 16-bit

Q29. Which of the following is not true about 8085 microprocessor?

1. It is an 8-bit microprocessor
2. It is a 40 pin DIP chip
3. It is manufactured using PMOS technology
4. It has 16 address lines

Q30. Which of the following is a non-vectored input?

1. TRAP
2. RST-7.5
3. RST-6.5
4. INTR

Q31. Which of the following is true?

1. Every instruction has two parts i.e. opcode and operands
2. MOV B, C is a two-byte instruction
3. MVI A, 90H is a three-byte instruction
4. Maximum number of T-states possible for the execution of an instruction is 16

Q32. Which of the following addressing mode is used by 8085 microprocessor for array and list operations?

1. Base-Register
2. Direst
3. Indexed
4. Immediate

Q33. What is stored in the H & L general-purpose register?

1. Opcode
2. Address of memory
3. Address of next instruction
4. Temporary data

Q34. If a 90 GB memory has to be connected to a microprocessor, minimum how many address lines are required?

1. 36
2. 39
3. 32
4. 37

Q35. Which of the following is a software interrupt?

1. TRAP
2. INTR
3. RST-6.5
4. RST-5

Q36. What is the vectored address of RST-5?

1. 0010 H
2. 0032 H
3. 0028 H
4. 0030 H

Q37. Which of the following is true about stack pointer?

1. Stack pointer contains the address of the top of the stack memory
2. Stack pointer is an 8-bit register
3. Stack pointer stores data permanently
4. Stack pointer is initialized after stack operation

Q38. How many address lines are required to connect a 4 KB RAM to a microprocessor?

1. 10
2. 16
3. 12
4. 20

Q39. Which of the following is true about MOV A, B instruction?

1. It means move the content of register A to register B
2. It uses immediate addressing mode
3. It doesn’t affect the flag register
4. It is a 2-byte instruction

Q40. Which of the following is false about LDA instruction?

1. It is a 3-byte instruction
2. It uses indirect addressing mode
3. It has 13 T-states
4. It doesn’t affect any flags

Q41. What is Microprocessor?

1. A multipurpose PLD that accepts binary data as input
2. A multipurpose PLD that accepts an integer as input
3. A multipurpose PLD that accepts whole numbers as input
4. A multipurpose PLD that accepts prime numbers as input

Q42. Which of the following is correct about 8086 microprocessor?

1. Intel’s first x86 processor
2. Motrola’s first x86 processor
3. STMICROELECTRONICS’s first x86 processor
4. NanoXplore x86 processor

Q43. Which of the following is a type of microprocessor?

1. CISC
2. RISC
3. EPIC
4. All of the mentioned

Q44. The microprocessor of a computer can operate on any information if it is present in ______________ only.

1. Program Counter
2. Flag
3. Main Memory
4. Secondary Memory

Q45. Which of the following technology was used by Intel to design its first 8-bit microprocessor?

1. NMOS
2. HMOS
3. PMOS
4. TTL

Q46. Which of the following addressing method does the instruction, MOV AX,[BX] represent?

1. register indirect addressing mode
2. direct addressing mode
3. register addressing mode
4. register relative addressing mode

Q47. What is the word length of an 8-bit microprocessor?

1. 8-bits – 64 bits
2. 4-bits – 32 bits
3. 8-bits – 16 bits
4. 8-bits – 32 bits

Q48. In 8-bit microprocessor, how many opcodes are present?

1. 246
2. 278
3. 250
4. 256

Q49. Which of the following is not true about the address bus?

1. It consists of control PIN 21 to 28
2. It is a bidirectional bus
3. It is 16 bits in length
4. Lower address bus lines (AD₀ – AD₇) are called “Line number”

Q50. Which of the following is true about microprocessors?

1. It has an internal memory
2. It has interfacing circuits
3. It contains ALU, CU, and registers
4. It uses Harvard architecture

Q51. Which of the following is the correct sequence of operations in a microprocessor?

1. Opcode fetch, memory read, memory write, I/O read, I/O write
2. Opcode fetch, memory write, memory read, I/O read, I/O write
3. I/O read, opcode fetch, memory read, memory write, I/O write
4. I/O read, opcode fetch, memory write, memory read, I/O write

Q52. The ________ directive instructs the assembler to begin memory allocation for a segment/block/code from the stated address.

1. GROUP
2. OFFSET
3. ORG
4. LABEL

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