Operating System Questions

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401.

Operating system is

A

A collection of hardware components

B

A collection of input-output devices

C

A collection of software routines

D

All of the above

E

None of the above

Correct Answer: C

Operating system is a collection of software routines

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402.

A file organization component of a VSAM file is:

A

relative record data set

B

keyed sequential data set

C

entry sequential data set

D

all of the above

E

None of the above

Correct Answer: D

None.

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403.

What is the name given to the software which can be legally compiled and often used for free?

A

Shareware program

B

Public domain program

C

Firmware program

D

Mindware

E

None of the above

Correct Answer: B

Public-domain software (program) refers to any program that is not copyrighted. Public-domain software (program) is free and can be used without restrictions. The term public-domain software is often used incorrectly to include freeware, free software that is nevertheless copyrighted.

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404.

The SJF algorithm executes first the job

A

that last entered the queue

B

that first entered the queue

C

that has been in the queue the longest

D

with the least processor needs

E

None of the above

Correct Answer: D

The SJF algorithm executes first the job with the least processor needs.

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405.

In which of the storage placement strategies a program is placed in the largest available hole in the main memory?

A

best fit

B

first fit

C

worst fit

D

buddy

E

None of the above

Correct Answer: C

None.

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406.

Which of the following is a block device

A

mouse

B

printer

C

terminals

D

disk

E

None of the above

Correct Answer: D

A block device is a computer data storage device that supports reading and (optionally) writing data in fixed-size blocks, sectors, or clusters. These blocks are generally 512 bytes or a multiple thereof in size.

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407.

The problem of thrashing is affected significantly by:

A

program structure

B

program size

C

primary-storage size

D

all of the above

E

None of the above

Correct Answer: A

The problem of thrashing is affected significantly by program structure

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408.

Which of the following software types is used to simplify using systems software?

A

spreadsheet

B

operating environment

C

timesharing

D

multitasking

E

None of the above

Correct Answer: C

In computing, time-sharing is the sharing of a computing resource among many users by means of multiprogramming and multi-tasking at the same time. Its introduction in the 1960s and emergence as the prominent model of computing in the 1970s represented a major technological shift in the history of computing.

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409.

Which of the following is not true about the memory management?

A

virtual memory is used only in multi-user systems

B

segmentation suffers from external fragmentation

C

paging suffers from internal fragmentation

D

segmented memory can be paged

E

None of the above

Correct Answer: A

None.

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410.

Paging

A

is a method of memory allocation by which the program is subdivided into equal portions, or pages and core is subdivided into equal portions or blocks.

B

consists of those addresses that may be generated by a processor during execution of a computation.

C

is a method of allocating processor time.

D

allows multiple programs to reside in separate areas of core at the time.

E

None of the above

Correct Answer: A

In computer operating systems, paging is a memory management scheme by which a computer stores and retrieves data from secondary storage for use in main memory. In this scheme, the operating system retrieves data from secondary storage in same-size blocks called pages. Paging is an important part of virtual memory implementations in modern operating systems, using secondary storage to let programs exceed the size of available physical memory.

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