Question # 1

To avoid the race condition the number of process that may be simultaneously inside the critical section is

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1

3

0

12

Macintosh computer uses

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System 7.0

AU/X

Xenix

None

In real time OS, which is most suitable scheduling scheme.

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Round robin

FCFS

Pre-emptive scheduling

Random scheduling

Tee command is used in LINUX for.

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Read from an input and write to a standard output and file.

Read from an input

Write to an output

None of above

If two files on same partition point to the same inode structure they are called.

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Soft links

Hard links

Copy links

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Instruction

Compiler

Program

Interpretor

Super visor state is only allowed to.

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Utility softwares

Application sotware

Operating system

Guest user

Which one shows the name of the operating system.

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U name -n

Uname -I

U name - m

U name -o

What is property of UNIX.

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Multi user

Multi processes

Multi tasking

All of above

Which type of software can be used to merge data of two files in one files.

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System software

Networking software

Documenting software

utility software

Four necessary conditions for dead lock are none pre emption circular wait and

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Mutual exclusion

Race condition

Buffer overflow

None of above

What are the global locks.

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They synchronize access to local resources.

They synchronize access to global resources

They synchronize access to local and global resources

None of above

Which of following is not an advantage of multiprogramming.

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Increased through out

Shorter response time

Ability to assign priories of jobs

Decreased system overload

Seek analysis is for.

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Paging issues

Device busy problems

Control unit busy problems

All of above

The system calls in UNIX is written using which language.

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Java

C

C++

Assembly

Creating a job queue is a function of

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Spooler

Interpolator

Complier

Drive

Which scheduling policy is most suitable for time shared operating system.

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Shortest job first

FCFS

LCFS

Round robin

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

Which command changes a files group owner

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chmod

chgrp

chown

chgrep

Banker's algorithm deals with

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Dead lock prevention

Dead lock avoidance

Dead look recovery

Mutual exclusion

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

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