Unix Operating system solved MCQ’s Questions Answers

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1. Which of the following is not related to UNIX?
(A) UNIX was not written in C language
(B) Linux is also a version of UNIX
(C) UNIX is not for a window
(D) None of these

2. The first line of shell starts with:
(A) @
(B) #
(C) &
(D) %

3. dev/null is a:
(A) software
(B) command
(C) file
(D) None of these

4. The minimum number of links for any directory file?
(A) 5
(B) 6
(C) 7
(D) 2

5. Which command in UNIX is used to set the task priority?
(A) kil
(B) nice
(C) it
(D) ps

6. Which part of the UNIX operating system interacts with its hardware?
(A) Vi editor
(B) shell
(C) kernel
(D) none of these

7. Which command is used for making the scripts interactive?
(A) chmod +w
(B) chmod +rw
(C) chmod +r
(D) chmod +x

8. One advantage of binary files over text files is that:
(A) they are much reliable
(B) it is compact
(C) it can be accessed faster
(D) all of these

9. All user directories are usually placed in which directory?
(A) ldev
(B) user
(C) urw
(D) lusr

10. The file size of any block in the UNIX file system is:
(A) 2048
(B) 512
(C) 1024
(D) any of the above

11. The UNIX operating system uses:
(A) handshaking
(B) affinity scheduling
(C) infinity scheduling
(D) Fair primitive scheduling

12. Superuser means:
(A) system user
(B) system manager
(C) normal user
(D) Administrator

13. Is Shell’s internal tool related to the read command?
(A) no
(B) yes
(C) both A and B
(D) none of these

14. Each entry in the inode table is the size of:
(A) 32kb
(B) 64 Gb
(C) 64kb
(D) 64 bytes

15. Which command is used to see the last access time of various files in a file system?
(A) ls -mt
(B) ls -lu
(C) rmt
(D) none of these

16. Which directory structure is used in UNIX?
(A) tree directory
(B) diamond directory
(C) hierarchical directory
(D) graph-structured directory

17. The windowing system of UNIX is called:
(A) LINUX
(B) UNIX
(C) DOS
(D) X windowing system

18. The first argument read by the shell into the printer is known as:
(A) $1
(B) $@
(C) $#
(D) $2

19. Which one is not true?
(A) sort is not a filter
(B) sorting is done on the basis of the first character of each line
(C) sort command sorts a file word by word rather than line by line
(D) none of these

20. The command head f1 would display:
(A) nothing
(B) the whole file f1
(C) First 10 lines of the file f1
(D) none of these

21. In UNIX, which of the following is not part of the user information?
(A) kernel task
(B) task scheduling
(C) scheduling parameters
(D) system call states

22. UNIX Shell Offerings MCQs
Q#1 As a shorthand representation of the home directory, the ___ acts.
(A) $
(B) “”
(C) ~

23. For the previous command having the last occurrence of string cvf, which command searches the history list?
(A) /bkw
(B) /cvf [enter]
(C) /cvf
(D) !cvf

24. Which of the following file is executed each time the second shell is called up?
(A) .profile
(B) env.file
(C) .script
(D) rc file

25. The history variables are_____
(A) HISTISIZE and HISTFILESIZE
(B) HISTFILESIZE
(C) HISTORY
(D) HISTISIZE

26. For avoiding overwriting an existing file, which keyword is used with the set command?
(A) noclobber
(B) ignore
(C) clobber
(D) nooverwrite

27. ___ can be used as a keyword with the set command to prevent accidentally logging out.
(A) noclobber
(B) log out
(C) ignore
(D) ignoreeof

28. ___ symbol is used to reverse any setting updated by the set command.
(A) +
(B) /
(C) –
(D) $

Unix Operating system solved MCQ’s Questions Answers
By: Prof. Dr. Fazal Rehman | Last updated: May 30, 2025

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