Microprocessor MCQ

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Question 1 : In 8086, when the carry is generated from D3 bit (of D7-D0) ,flag set condition is shown with which flag?

  1. Auxiliary carry
  2. Carry flag
  3. Overflow flag
  4. Trap flag
    

Question 2 : In 8255, Bidirectional I/O mode is applicable for which port?

  1. Port A
  2. Port B
  3. Port C
  4. Port B lower
    

Question 3 : What will be the starting and ending offset address (or range) if the size of the segment is 64 KB?

  1. 0000H to 7FFFH
  2. 0000H to FFFFH
  3. 8000H to FFFFH
  4. 00000H to FFFFFH
    

Question 4 : Which is the 8086 instruction that copies content of flag register on to the stack?

  1. PUSH
  2. POP
  3. PUSHF
  4. POPF
    

Question 5 : What will be the 8-bit command to mask IR6, IR7 and unmask all other interrupts of 8259 using OCW1?

  1. A0H
  2. C0H
  3. D0H
  4. 0CH
    

Question 6 : Select the correct difference between compare and subtract instruction of 8086

  1. Compare instruction stores the result of comparison
  2. Compare instruction shows result using flags and doesn’t store result
  3. Subtraction doesn’t store result
  4. Subtraction shows result using flags and doesn’t store result
    

Question 7 : Which unit provides a four level protection mechanism for system code and data against application program in 80386?

  1. Paging Unit
  2. Segmentation Unit
  3. Execution Unit
  4. Central Processing Unit
    

Question 8 : When an interrupt occurs, it breaks the execution of current instruction and diverts its execution to one of the following?

  1. Interrupt service routine
  2. Counter word register
  3. Execution unit
  4. control unit
    

Question 9 : What is used to implement the multiple branch prediction in Pentium processor?

  1. control unit
  2. bus interface unit
  3. branch instruction register
  4. branch target buffer
    

Question 10 : Which is the address decoding technique where all remaining address lines are used to generate the Chip select signal?

  1. Partial
  2. Absolute
  3. Block
  4. non linear
    

Question 11 : Which is the main feature provided by Pentium?

  1. superscalar architecture
  2. Multithreading architecture
  3. Multioperational architecture
  4. superscalar and super pipelined architecture
    

Question 12 : Which addressing mode is being used in the 8086 given instruction? MOV [BX],DL

  1. Direct Addressing Mode
  2. Register Indirect Addressing Mode
  3. Register Addressing Mode
  4. Immediate Addressing Mode
    

Question 13 : In Pentium, the percentage of hits to the total cache access is given by?

  1. Hit Ratio
  2. Accuracy
  3. Efficiency
  4. Precision
    

Question 14 : Which instruction makes the 8086 processor check the TEST* pin (* indicates active low signal)?

  1. WAIT
  2. ESC
  3. LOCK
  4. HLT
    

Question 15 : Which offset address register is used to generate 20 bit physical address for Code Segment in 8086?

  1. Stack Pointer Register
  2. Base Pointer Register
  3. Source Index Register
  4. Instruction Pointer Register
    

Question 16 : The size of Segment address, offset address & physical address are ________ bits each in 8086 microprocessor.

  1. 8,8 & 16
  2. 8,16 & 20
  3. 16,16 & 20
  4. 8,8 & 8
    

Question 17 : Which instruction among the following unconditionally transfers the control of execution to the provided address?

  1. CALL
  2. IRET
  3. JNC
  4. JMP
    

Question 18 : In 8253 PIT device, the counter starts counting only if ?

  1. GATE signal is low
  2. GATE signal is high
  3. CLK signal is low
  4. CLK signal is high
    

Question 19 : How many bits logical address is supported by 80386 DX microprocessor?

  1. 32
  2. 20
  3. 64
  4. 48
    

Question 20 : Which register of 8259 PIC stores all interrupt level that are requesting for interrupt service?

  1. IMR
  2. ISR
  3. Control Register
  4. IRR
    

Question 21 : In 8257 (DMA), each of the four channels has?

  1. a pair of two 8-bit registers
  2. a pair of two 16-bit registers
  3. one 16-bit register
  4. one 8-bit register
    

Question 22 : Which mode does 8086 microprocessor operate in if MN/MX is low?

  1. Minimum Mode
  2. Maximum mode
  3. Control Mode
  4. Execute Mode
    

Question 23 : What is the contents of the register after execution of following: MOV AL, E9H NEG AL

  1. 16
  2. 15
  3. 17
  4. 26
    

Question 24 : What is the memory data bus width in Pentium?

  1. 16 bit
  2. 32 bit
  3. 64 bit
  4. 48 bit
    

Question 25 : Which type of descriptor table from the following is supported by 80386 DX ?

  1. TDS
  2. ADT
  3. GDT
  4. MDS
    

Question 26 : ICW1 of single 8259 which is edge triggered will be?

  1. 0BH
  2. 13H
  3. 11H
  4. 40H
    

Question 27 : Which is a not part of Bus Interface Unit

  1. Instruction Queue
  2. Segment Registers
  3. Address conversion mechanism
  4. ALU
    

Question 28 : On the execution of CMPSB contents of which segment compared with contents of which segment?

  1. CS & DS
  2. DS & ES
  3. DS & DS
  4. ES & ES
    

Question 29 : If any interrupt request given to an input pin cannot be disabled by any means then the input pin is called as?

  1. Maskable interrupt
  2. Non-maskable interrupt
  3. Maskable interrupt and Non-maskable interrupt
  4. Interrupt Request
    

Question 30 : Segment currently being accessed by 8086 is indicated by which status register?

  1. s3 & s4
  2. s0 & s1
  3. s5 & s6
  4. s1 & s2
    
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