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

Which is signal user operating system.

Question # 2

Problem of thrashing is affected significantly by

Question # 3

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

Question # 4

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

Question # 5

Which among following scheduling algorithms give minimum average waiting time.

Question # 6

Which one is true.

Question # 7

Default permissions of file can be changed with.

Question # 8

Creating a job queue is a function of

Question # 9

Which command is used to copy files.

Question # 10

Daisy chain is a device for

Question # 11

Which among the following is used to write small program to control Linux Functionalities.

Question # 12

Which among following is considered as super daemon.

Question # 13

Multiprogramming system

Question # 14

Which of the following memory allocation scheme is subject to external fragmentation.

Question # 15

Macintosh computer uses

Question # 16

A publics key encryption system.

Question # 17

Which command can be used to know the present working directory.

Question # 18

Which of following is not an advantage of multiprogramming.

Question # 19

What are the global locks.

Question # 20

Poor response times are caused by

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PPSC ComputerScience Chapter 19 Important MCQ's

Sr.# Question Answer
1 Which of the following does not interrupt an running process.
A. A device
B. Timer
C. Scheduler process
D. Power failure
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 What is the maximum number of processes that may enter simultaneously inside the critical section to avoid race condition.
A. One
B. Two
C. Three
D. Four
4 Belady anomaly occurs in
A. Optimal replacement
B. FIFO
C. LRU
D. Both in FIFO and LRU
5 File can have.
A. Read access
B. Write access
C. Copy access
D. All of above
6 Which command is used to copy files.
A. cp
B. copy
C. mv
D. move
7 If two files on same partition point to the same inode structure they are called.
A. Soft links
B. Hard links
C. Copy links
D. similar links
8 File inode number can be viewed by.
A. -8
B. -1
C. -a
D. -t
9 When did IBM released the first version of its disk operating system DOS version 1.0
A. 1981
B. 1982
C. 1983
D. 1984
10 In real time OS, which is most suitable scheduling scheme.
A. Round robin
B. FCFS
C. Pre-emptive scheduling
D. Random scheduling

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