PPSC Computer Science Topic 19 MCQ's Test Preparation

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MCQ's Test For PPSC Computer Science Topic 19 Operating System

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PPSC Computer Science Topic 19 Operating System

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Question # 1

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

Question # 2

Poor response times are caused by

Question # 3

A thread is.

Question # 4

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

Question # 5

A publics key encryption system.

Question # 6

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

Question # 7

To display disk consumption of a specific directory which command is used.

Question # 8

Solaris is product of.

Question # 9

Spooling most beneficial where

Question # 10

Fragmentation of a file system.

Question # 11

Reference bit is used for

Question # 12

Which LINUX command is used to update the modification time of a file.

Question # 13

Which of following need a device driever.

Question # 14

Problem of thrashing is affected significantly by

Question # 15

Multiprogramming system

Question # 16

How many links are created when we create a directory file.

Question # 17

Distributed systems should.

Question # 18

Banker's algorithm deals with

Question # 19

Which technique is used by operating systems to execute several program concurrently by switching back and forth.

Question # 20

Super visor state is only allowed to.

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Sr.# Question Answer
1 Dirty bit is used ot show
A. Page with corrupted data
B. Wrong page in memory
C. Page that a modified after being loaded in the cache memory
D. Page that is less frequently accessed
2 Which scheduling policy is best suited for time sharing operating system.
A. Shortest job first
B. Round robin
C. First come first serve
D. Elevator
3 Which is non pre emptive
A. Round robin
B. FIFO
C. MS
D. MSF
4 By which of following the problem of thrashing is significantly affected.
A. Program size
B. Program structure
C. Primary storage
D. Secondary strorage
5 What is the name of values that are automatically provided by software to reduce keystrokes.
A. Data values
B. Default values
C. Defined values
D. Fixed vallues
6 The part of machine level instruction which tells the central processor what has to be done is.
A. Operation code
B. Address
C. Locator
D. Flip flop
7 Which command gives the first byte where the difference is in the file 1 & file2
A. Diff
B. differ
C. Cmp
D. Compare
8 Size of virtual memory depends on
A. Size of data bus
B. Size of address bus
C. Size of main memory
D. None of above
9 which option of 'grep' displays the line number as well.
A. -n
B. -i
C. -d
D. -al
10 Which command in vi editor command is used to copy the current line of the file.
A. ys
B. yy
C. yc
D. yw
11 Tee command is used in LINUX for.
A.
Read from an input and write to a standard output and file.
B. Read from an input
C. Write to an output
D. None of above
12 Which technique is used by operating systems to execute several program concurrently by switching back and forth.
A. Partitioning
B. Multitasking
C. Windowing
D. Paging
13 When did IBM released the first version of its disk operating system DOS version 1.0
A. 1981
B. 1982
C. 1983
D. 1984
14 To avoid the race condition the number of process that may be simultaneously inside the critical section is
A. 1
B. 3
C. 0
D. 12
15 In vi editor which command sets the number for all lines.
A. Set nu
B. Set ni
C. Set sn
D. Set sl
16 Which of the following does not interrupt an running process.
A. A device
B. Timer
C. Scheduler process
D. Power failure
17 Which command is used to record a user login session in a file.
A. script
B. Record
C. Copy
D. Session
18 Which of the following memory allocation scheme is subject to external fragmentation.
A. Segmentation
B. Swapping
C. Demand paging
D. Multiple contiguous fixed partitions
19 Which process is known for initializing a microcomputer with its OS.
A. Cold booting
B. Boot recording
C. Booting
D. Warm booting
20 Semaphores are used to solve the problem of.
A. Race condition
B. Process synchronization
C. Mutual exclusion
D. Belady problem

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