Machine instructions and Addressing modes Questions

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11.

In the following indexed addressing mode instruction, MOV 5(R1), LOC the effective address is ______

A

EA = 5+R1

B

EA = R1

C

EA = [R1]

D

EA = 5+[R1]

Correct Answer: D

This instruction is in Base with offset addressing mode.

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12.

The addressing mode/s, which uses the PC instead of a general purpose register is ______

A

Indexed with offset

B

Relative

C

Direct

D

Both Indexed with offset and direct

Correct Answer: B

In this, the contents of the PC are directly incremented.

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13.

When we use auto increment or auto decrements, which of the following is/are true?
1) In both, the address is used to retrieve the operand and then the address gets altered
2) In auto increment, the operand is retrieved first and then the address altered
3) Both of them can be used on general purpose registers as well as memory locations

A

1, 2, 3

B

2

C

1,2

D

2,3

Correct Answer: D

In the case of, auto increment the increment is done afterward and in auto decrement the decrement is done first.

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14.

The addressing mode, where you directly specify the operand value is _______

A

Immediate

B

Direct

C

Definite

D

Relative

Correct Answer: A

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15.

The effective address of the following instruction is MUL 5(R1,R2).

A

5+R1+R2

B

5+(R1*R2)

C

5+[R1]+[R2]

D

5*([R1]+[R2])

Correct Answer: C

The addressing mode used is base with offset and index.

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16.

_____ addressing mode is most suitable to change the normal sequence of execution of instructions.

A

Relative

B

Indirect

C

Index with Offset

D

Immediate

Correct Answer: A

The relative addressing mode is used for this since it directly updates the PC.

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17.

Storage of data is done in

A

RAM

B

 Registers

C

Cache

D

All

Correct Answer: D

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18.

CPU consists of the following Functional Units

A

CU

B

ALU

C

Both

D

None

Correct Answer: C

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19.

Bus is collection of __________________.

A

Lines 

B

Signals

C

Both 

D

None 

Correct Answer: A

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20.

System software is considered as interface between(i)H/W (ii) S/W (iii) User Applications 

A

(i) (ii)

B

(i) (iii) 

C

(ii) (iii) 

D

All 

Correct Answer: B

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