Operating System Questions

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501.

Information in a memory that is no longer valid or wanted is known as

A

non-volatile

B

volatile

C

surplus

D

garbage

E

None of the above

Correct Answer: D

Information in a memory that is no longer valid or wanted is known as garbage.

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502.

Which of the following filename extension suggests that the file is a backup copy of another file?

A

.txt

B

.com

C

.bas

D

.bak

E

None of the above

Correct Answer: D

In computing, ".bak" is a filename extension commonly used to signify a backup copy of a file. When a program is about to overwrite an existing file (for example, when the user saves the document they are working on), the program may first make a copy of the existing file, with .bak appended to the filename. This common .bak naming scheme makes it possible to retrieve the original contents of the file. In a similar manner, a user may also manually make a copy of the file before the change and append .bak to the filename.

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503.

Relocation bits used by relocating loader are specified (generated) by

A

Relocating loader itself

B

Linker

C

Assembler or translator

D

Macro processor

E

None of the above

Correct Answer: B

Relocation bits used by relocating loader are specified (generated) by linker

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504.

Which of the following statements is false?

A

a process scheduling algorithm is preemptive if the CPU can be forcibly removed from a process

B

time sharing systems generally use preemptive CPU scheduling

C

response time are more predictable in preemptive systems than in non preemptive systems

D

real time systems generally use non-preemptive CPU scheduling

E

None of the above

Correct Answer: D

None.

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505.

Non-modifiable procedures are called

A

serially usable procedures

B

concurrent procedures

C

reentrant procedures

D

topdown procedures

E

None of the above

Correct Answer: C

None.

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506.

The instruction register

A

is a hardware memory device which denotes the location of the current instruction being executed.

B

is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.

C

contains the address of the memory location that is to be read from or stored into.

D

contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".

E

None of the above

Correct Answer: B

The instruction register is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.

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507.

Which of the following scheduling objectives should be applied to the following: the system should admit jobs to create a mix that will keep most devices busy

A

to be fair

B

to balance resource utilization

C

to obey priorities

D

to be predictable

E

None of the above

Correct Answer: B

None.

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508.

Multiprogramming systems:

A

are easier to develop than single programming system

B

execute each job faster

C

execute more jobs in the same time period

D

are used only on large mainframe computers

E

None of the above

Correct Answer: C

Multitasking has the same meaning of multiprogramming but in a more general sense, as it refers to having multiple (programs, processes, tasks, threads) running at the same time. This term is used in modern operating systems when multiple tasks share a common processing resource (e.g., CPU and Memory).

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509.

Backups should be done

A

daily for most installations

B

weekly for most installations

C

as several image copies, followed by an incremental

D

as several incrementals, followed by an image copy

E

None of the above

Correct Answer: D

Backups should be done as several incrementals, followed by an image copy

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510.

In an absolute loading scheme, which loader function is accomplished by assembler.

A

Reallocation

B

Allocation

C

Linking

D

Loading

E

None of the above

Correct Answer: A

None.

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