10973890
Descripción
Test por Faheem Ahmed, actualizado hace más de 1 año
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Creado por Faheem Ahmed
hace más de 6 años
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Pregunta 1
Pregunta
In 8085 microprocessor, the value of the most significant bit of the result following the execution of any arithmetic or Boolean instruction is stored in the
Respuesta
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carry flag
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auxiliary carry flag
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sign flag
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zero flag
Pregunta 2
Pregunta
How many bytes in a double word ?
Respuesta
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1 byte
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2 bytes
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3 bytes
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4 bytes
Pregunta 3
Pregunta
What is the value of AX register after executing,
MOV AX,456h,
CMP AX,456h
Respuesta
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456h
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Zero
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UnKnown
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400h
Pregunta 4
Pregunta
The instruction AND AH,11110111 is equivalent to
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Sub AH, 8, if 4th bit of AH is set
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Sub AH, 8, if 4th bit of AH is cleared
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Sub AH, 4, if 4th bit of AH is set
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None of the above
Pregunta 5
Pregunta
The debug command U
Respuesta
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Retrieve the assembly program instructions from the disk
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Retrieve the assembly program instructions from the RAM
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Convert the machine code stored in memory into assembly equivalent
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None of the above
Pregunta 6
Pregunta
The debug command: -E F000:0 1 2 3
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Has no effect, because that location in ROM
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Will write three bytes (1,2,3) starting at location F000:0
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Depends on the processor
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Invalid command
Pregunta 7
Pregunta
Consider the program segment:
Age DB 100
MOV Age,123
What is the memory-addressing mode of the first operand in the MOV instruction?
Respuesta
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Immediate addressing mode
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Direct addressing mode
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Indirect addressing mode
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Implied addressing
Pregunta 8
Pregunta
The multiple Segment:Offset representations for a unique physical address is:
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Advantage for 8086 processor to provide flexibility
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Disadvantage for 8086 processor, it make it harder to program
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Has no effect.
Pregunta 9
Pregunta
Algorithms are designed using combinations of three main building blocks (control structures), called...
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loops, if/then/else statements and functions
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quark, strangeness and charm
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syntax, choice and loops
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sequence, selection and repetition
Pregunta 10
Pregunta
Pseudocode...
Respuesta
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is written with specialised editing software
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cannot describe if...then...else constructs
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provides a pictorial representation of an algorithm
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has features of both English and computer languages
Pregunta 11
Pregunta
In an 8085 microprocessor, the instruction CMP B has been executed while the content of the accumulator is less than that of register B. As a result
Respuesta
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Carry flag will be set but zero flag will be reset.
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Carry flag will be reset but zero flag will be set.
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Both Carry flag and zero flag will be reset.
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Both Carry flag and zero flag will be set.
Pregunta 12
Pregunta
Consider the sequence of 8085 instructions given below:
LXI H, 9258
MOV A, M
CMA
MOV M, A
which one of the following is performed by this sequence?
Respuesta
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Contents of location 9258 are moved to the accumulator.
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Contents of location 9258 are compared with the contents of accumulator
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Contents of location 9258 are complemented and stored in location 9258
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Contents of location 5892 are complemented and stored in location 5892
Pregunta 13
Pregunta
The 2' s complement representation of the decimal value (minus) - 15 is
Respuesta
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1111
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11111
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111111
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10001
Pregunta 14
Pregunta
The instruction, MOV AX, 1234H is an example of
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Register addressing mode
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Direct addressing mode
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Immediate addressing mode
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Based indexed addressing mode
Pregunta 15
Pregunta
Match the following:
1. A Push Instruction a. Pre Increment the SP
2. A Pop Instruction. b. Post Increment the SP
c. Pre Decrement the SP
d. Post Decrement the SP.
Respuesta
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1-> a, 2 -> b
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1->b, 2 -> c
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1-> c, 2 -> d
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1-> d, 2->a
Pregunta 16
Pregunta
In 8085, which of the following modifies the program counter ?
Respuesta
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Only PCHL instruction
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Only ADD instructions
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Only JMP and CALL instructions
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All instructions
Pregunta 17
Pregunta
The instruction that is used as prefix to an instruction to execute it repeatedly until the CX register becomes zero is
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SCAS
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REP
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CMPS
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STOS
Pregunta 18
Pregunta
In 8086 microprocessor one of the following statements is NOT true.
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Coprocessor is interfaced in MAX mode
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Coprocessor is interfaced in MIN mode
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I/O can be interfaced in MAX / MIN mode
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Supports pipelining
Pregunta 19
Pregunta
The status flag that cannot be operated by direct instruction is
Respuesta
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Cy
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Z
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P
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AC
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S
Pregunta 20
Pregunta
Interfacing devices for DMA controller, programmable interval timer are respectively
Respuesta
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8257, 8253
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8253, 8257
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8257,8251
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8251,8257
Pregunta 21
Pregunta
Which of the following are the three basic sections of a microprocessor unit?
Respuesta
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operand, register, and arithmetic/logic unit (ALU)
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control and timing, register, and arithmetic/logic unit (ALU)
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control and timing, register, and memory
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arithmetic/logic unit (ALU), memory, and input/output
Pregunta 22
Pregunta
The instruction, MOV AX, [BX] is an example of
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direct addressing mode
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register addressing mode
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register relative addressing mode
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register indirect addressing mode
Pregunta 23
Pregunta
Which of the following instruction is NOT valid?
Respuesta
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MOV AX, BX
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MOV DS, 5000H
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MOV AX, 5000H
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PUSH AX
Pregunta 24
Pregunta
The instruction that is used for finding out the codes in case of code conversion problems is
Respuesta
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XCHG
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XLAT
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XOR
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JCXZ
Pregunta 25
Pregunta
The instruction that performs logical AND operation and the result of the operation is not available is
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AAA
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AND
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TEST
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XOR
Pregunta 26
Pregunta
The instruction that is NOT valid is
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MOV AX, [BX]
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MOV AX, 5555H
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MOV AX, [SI]
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MOV [SI], [DI]
Pregunta 27
Pregunta
In 8086 microprocessor, the stack segment may have a memory block of a maximum of
Respuesta
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32K bytes
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64K bytes
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16K bytes
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8K bytes
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Unlimited bytes.
Pregunta 28
Pregunta
In 8086 the overflow flag is set when______.
Respuesta
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The sum is more than 16 bit
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Carry and sign flags are set
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Signed numbers go out of their range after an arithmetic operation
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During subtraction
Pregunta 29
Pregunta
Direction flag is used with ____.
Respuesta
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String instructions
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Arithmetic Instructions
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Stack Instructions
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Branch Instructions
Pregunta 30
Pregunta
If_________ flag is set; the processor enters the single step execution mode.
Respuesta
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Direction
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Trap
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Interrupt
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Zero
Pregunta 31
Pregunta
If segment address = 1005 H, offset address = 5555 H, then the physical address is_____.
Respuesta
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6555A H
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155A5 H
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45500 H
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56555 H
Pregunta 32
Pregunta
BHE of 8086 microprocessor signal is used to interface the_____
Respuesta
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I/O
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DMA
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Even bank memory
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Odd bank memory
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