Subroutines and Nesting Questions

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1.

The return address of the Sub-routine is pointed to by _______

A

IR

B

PC

C

MAR

D

Special memory registers

Correct Answer: B

The return address from the subroutine is pointed to by the PC.

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2.

The location to return to, from the subroutine is stored in _______

A

TLB

B

PC

C

MAR

D

Link registers

Correct Answer: D

The registers store the return address of the routine and is pointed to by the PC.

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3.

What is subroutine nesting?

A

Having multiple subroutines in a program

B

Using a linking nest statement to put many subroutines under the same name

C

Having one routine call the other

D

None of the mentioned

Correct Answer: C

None

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4.

The order in which the return addresses are generated and used is _________

A

LIFO

B

FIFO

C

Random

D

Highest priority

Correct Answer: A

That is the routine called first is returned first.

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5.

In case of nested subroutines the return addresses are stored in __________

A

System heap

B

Special memory buffers

C

Processor stack

D

Registers

Correct Answer: C

In this case, there will be more number of return addresses it is stored on the processor stack.

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6.

The appropriate return addresses are obtained with the help of ____ in case of nested routines.

A

MAR

B

MDR

C

Buffers

D

Stack-pointers

Correct Answer: D

The pointers are used to point to the location on the stack where the address is stored.

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7.

When parameters are being passed on to the subroutines they are stored in ________

A

Registers

B

Memory locations

C

Processor stacks

D

All of the mentioned

Correct Answer: D

In the case of, parameter passing the data can be stored on any of the storage space.

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8.

The most efficient way of handling parameter passing is by using ______

A

General purpose registers

B

Stacks

C

Memory locations

D

None of the mentioned

Correct Answer: A

By using general purpose registers for the parameter passing we make the process more efficient.

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9.

The most Flexible way of logging the return addresses of the subroutines is by using _______

A

Registers

B

Stacks

C

Memory locations

D

None of the mentioned

Correct Answer: B

The stacks are used as Logs for return addresses of the subroutines.

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10.

The wrong statement/s regarding interrupts and subroutines among the following is/are ______
i) The sub-routine and interrupts have a return statement
ii) Both of them alter the content of the PC
iii) Both are software oriented
iv) Both can be initiated by the user

A

i, ii and iv

B

ii and iii

C

iv

D

iii and iv

Correct Answer: D

None

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