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Computer Science Set-1
Computer Organization and Architecture
55

Computer Organization and Architecture MCQ with Answers

55) The addressing mode used in the instruction PUSH B is

Direct

Register

Register indirect

Index

Answer is:

Register

Computer Organization and Architecture MCQ with Answers

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Related Computer Organization and Architecture MCQ with Answers

56) The process of fetching and executing instructions,one at a time, in order of increasing addreses is called

Instruction execution

Straight line sequencing

Instruction fetch

Instruction Cycle

Answer is:

Straight line sequencing

57) The CPU of a Computer takes instruction from the memory and executes them. This process is called

Load cycle

Time sequence

Fetch-execute cycle

None of these

Answer is:

Fetch-execute cycle

The CPU of a Computer takes instruction from the memory and executes them. This process is called

58) When a program is being executed in an 8085 microprocessor, its Program Counter contains

Number of instructions in the current program that have already been executed

The total number of instructions in the program being executed

Memory address of the instruction that is being currently executed

Memory address of the instruction that is to be executed next

Answer is:

Memory address of the instruction that is to be executed next

59) When the HLT instruction of a 8085 micro-processor is executed, the microprocessor

Is disconnected from the system bus till the reset is pressed

Halts execution of the program and returns to monitor

Enters into a halt state and the buses are tri- stated

Reloads the program form the locations 0012 and 0013 H.

Answer is:

Enters into a halt state and the buses are tri- stated

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