Question # 1

Which scheduling policy is best suited for time sharing operating system.

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Shortest job first

Round robin

First come first serve

Elevator

Reference bit is used for

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Implementing LRU page replacement algorithm

Implementing NRU algorithm

To check the page table entry in the cache memory

None of above

Semaphores are used to solve the problem of.

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Race condition

Process synchronization

Mutual exclusion

Belady problem

Which among following is considered as super daemon.

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Sysinit

Grep

Init

Locate

In which of the following usually a front end processor is used.

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Virtual storage

Time sharing

Multi programming

Multi heading

Disk scheduling includes decinding

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Which should be accessed next

Order in which disk access requests must be serviced

The physical location of the file

the logical location of the file

A publics key encryption system.

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Allows only the correct sender to decode the data

Allows only the correct receiver to decode the data

Allows any one to decode the data

None of above

Daisy chain is a device for

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Connecting a number of controllers to a device

Connecting a number of device to a controller

all of above

None of above

Main function of shared memory is.

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To use primary memory efficiently

To do intra process communication

All of above

None

What is the command that can print lines of first file matching with second file.

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Printline

cmp

com

comn

Distributed systems should.

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Meet time constraints

Aim better resource sharing

Aim better system utilization

Aim low system overhead

Which command is used to set limits on file size.

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U limit

Alimit

dlimit

wilmit

Which command in vi editor command is used to copy the current line of the file.

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ys

yy

yc

yw

Default permissions of file can be changed with.

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Group

Chperm

chmod

Chall

When did IBM released the first version of its disk operating system DOS version 1.0

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1981

1982

1983

1984

Which is non pre emptive

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Round robin

FIFO

MS

MSF

Memory protection is normally done by

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The processor and the associated hardware

The operating system

The compiler

The user program

Which among following scheduling algorithms give minimum average waiting time.

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FCFS

SJF

Round rabin

On priority

Dynamic allocation of storage areas with VSAM files is accomplished by

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Hashing

Control splits

Over flow areas

Relative recording

Which operating system use write through catches.

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UNIX

XENIX

ULTRIX

DOS

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PPSC Computer Science Chapter 19 Operating System Online Test MCQs With Answers

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