Machine instructions and Addressing modes Questions

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1.

Machine instructions and addressing modes

A

Direct mode

B

Indirect mode

C

Relative mode

D

Indexed mode

Correct Answer: C

Relative Mode since we can just change the content of base register if we wish to relocate

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2.

Relative mode of addressing is most relevant to writing

A

Co-routines

B

Position

C

Shareable code

D

Shareable code

E

Interrupt Handlers

Correct Answer: B

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3.

Which of the following addressing modes permits relocation without any change whatsoever in the code?

A

Indirect addressing

B

Indexed addressing

C

PC relative addressing

D

Base register addressing

Correct Answer: D

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4.

A certain processor supports only the immediate and the direct addressing modes. Which of the following programminglanguage features cannot be implemented on this processor?

A

Pointers

B

Array

C

Records

D

Recursive procedures with local variables

Correct Answer: A

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5.

Which of the following addressing modes are suitable for program relocation at run time?

A

i) Absolute addressingii) Based addressingiii) Relative addressingiv) Indirect addressing

B

i and iv

C

i and ii

D

ii and iii

E

i,ii and iv

Correct Answer: C

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6.

The instruction, Add #45,R1 does _______

A

Adds the value of 45 to the address of R1 and stores 45 in that address

B

Adds 45 to the value of R1 and stores it in R1

C

Finds the memory location 45 and adds that content to that of R1

D

None of the mentioned

Correct Answer: B

The instruction is using immediate addressing mode hence the value is stored in the location 45 is added.

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7.

The instruction, Add #45,R1 does _______

A

Adds the value of 45 to the address of R1 and stores 45 in that address

B

Adds 45 to the value of R1 and stores it in R1

C

Finds the memory location 45 and adds that content to that of R1

D

None of the mentioned

Correct Answer: B

The instruction is using immediate addressing mode hence the value is stored in the location 45 is added.

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8.

In the case of, Zero-address instruction method the operands are stored in _____

A

Registers

B

Accumulators

C

Push down stack

D

Cache

Correct Answer: C

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9.

Add #45, when this instruction is executed the following happen/s _______

A

The processor raises an error and requests for one more operand

B

The value stored in memory location 45 is retrieved and one more operand is requested

C

The value 45 gets added to the value on the stack and is pushed onto the stack

D

None of the mentioned

Correct Answer: B

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10.

The addressing mode which makes use of in-direction pointers is ______

A

Indirect addressing mode

B

Index addressing mode

C

Relative addressing mode

D

Offset addressing mode

Correct Answer: A

In this addressing mode, the value of the register serves as another memory location and hence we use pointers to get the data.

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