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

00:00
Question # 1

By which of following the problem of thrashing is significantly affected.

Question # 2

Which command gives the first byte where the difference is in the file 1 & file2

Question # 3

In the shell , by default all variables are considered and stored as.

Question # 4

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

Question # 5

What is the maximum number of processes that may enter simultaneously inside the critical section to avoid race condition.

Question # 6

Which command is concerned with LINUX kernel log messages.

Question # 7

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

Question # 8

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

Question # 9

What control character signals the end of the input file.

Question # 10

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

Question # 11

Dynamic allocation of storage areas with VSAM files is accomplished by

Question # 12

Default permissions of file can be changed with.

Question # 13

All device files are stored in which directory.

Question # 14

A thread is.

Question # 15

Main function of shared memory is.

Question # 16

Which of following is not an advantage of multiprogramming.

Question # 17

Dirty bit is used ot show

Question # 18

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

Question # 19

Reference bit is used for

Question # 20

Belady anomaly occurs in

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PPSC ComputerScience Chapter 19 Important MCQ's

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 In the shell , by default all variables are considered and stored as.
A. Integer
B. String
C. Float
D. Chracter
3 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
4 What are the global locks.
A. They synchronize access to local resources.
B. They synchronize access to global resources
C. They synchronize access to local and global resources
D. None of above
5 Which command is used to determine the path of an executable file.
A. which
B. whom
C. locate
D. wex
6 A publics key encryption system.
A. Allows only the correct sender to decode the data
B. Allows only the correct receiver to decode the data
C. Allows any one to decode the data
D. None of above
7 Which of following is not an advantage of multiprogramming.
A. Increased through out
B. Shorter response time
C. Ability to assign priories of jobs
D. Decreased system overload
8 Belady anomaly occurs in.
A. LIFO
B. FIFO
C. LRU
D. NRU
9 Which among the following is used to write small program to control Linux Functionalities.
A. Shell commands
B. Shell script
C. C
D. Java
10 Which is not a valid file type in LINUX.
A. Socket
B. FIFO
C. Soft link
D. Inode

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