Operating System Questions

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321.

Fork is

A

the dispatching of a task

B

the creation of a new job

C

the creation of a new process

D

increasing the priority of a task

E

None of the above

Correct Answer: C

In computing, particularly in the context of the Unix operating system and its workalikes, fork is an operation whereby a process creates a copy of itself. It is usually a system call, implemented in the kernel. Fork is the primary method of process creation on Unix-like operating systems.

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322.

Thrashing

A

is a natural consequence of virtual memory systems

B

can always be avoided by swapping

C

always occurs on large computers

D

can be caused by poor paging algorithms

E

None of the above

Correct Answer: D

In computer science, thrashing occurs when a computer's virtual memory resources become saturated, leading to a constant state of paging, to the exclusion of most application-level processing. This causes the performance of the computer to degrade or collapse. Source : wikipedia.org

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323.

Supervisor state is

A

never used

B

entered by programs when they enter the processor

C

required to perform any I/O

D

only allowed to the operating system

E

None of the above

Correct Answer: D

The supervisor state is a special mode of operation to which the user has no access. When it is in the supervisor state, the processor and its actions are entirely controled by the Operating System (OS).

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324.

Which of the following instruction steps, would be written within the diamond-shaped box, of a flowchart?

A

S = B - C

B

IS A<10

C

PRINT A

D

DATA X,4Z

E

None of the above

Correct Answer: B

None.

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325.

Which of the following statements is false?

A

the technique of storage compaction involves moving all occupied areas of storage to one end or other of main storage

B

compaction does not involve relocation of programs

C

compaction is also know as garbage collection

D

the system must stop everything while it performs the compaction

E

None of the above

Correct Answer: B

None.

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326.

Interprocess communication

A

is required for all processes

B

is usually done via disk drives

C

is never necessary,

D

allows processes to synchronize activity

E

None of the above

Correct Answer: D

Interprocess communication allows processes to synchronize activity

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327.

Which of the following functions is(are) performed by the loader

A

allocate space in memory for the programs and resolve symbolic references between object decks

B

adjust all address dependent locations, such as address constants, to correspond to the allocated space.

C

physically place the machine instructions and data into memory.

D

All of the above

E

None of the above

Correct Answer: D

None.

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328.

User-Friendly Systems are:

A

required for object-oriented programming

B

easy to develop

C

common among traditional mainframe operating systems

D

becoming more common

E

None of the above

Correct Answer: D

User-Friendly Systems are becoming more common

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329.

Which of the following addressing modes, facilitates access to an operand whose location is defined relative to the beginning of the data structure in which it appears?

A

ascending

B

sorting

C

index

D

indirect

E

None of the above

Correct Answer: C

None.

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330.

While running DOS on a PC, which command would be used to duplicate the entire diskette?

A

COPY

B

DISKCOPY

C

CHKDSK

D

TYPE

E

None of the above

Correct Answer: B

None.

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