Operating System Architecture Set 14

Computer Science Engineering (CSE)

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This set of Operating System Architecture Multiple Choice Questions & Answers (MCQs) focuses on Operating System Architecture Set 14

Q1 | Which option of rmdir command will remove all directories a, b, c if path is a/b/c
  • –b
  • –o
  • –p
  • –t
Answer: –p
Q2 | Which represents the user home directory
  • /
  • .
  • ..
  • ~
Answer: ~
Q3 | f a file is removed in Unix using ‘rm’ then
  • the file can be recovered by a normal user
  • the file cannot be recovered by a user
  • the file can be fully recovered provided the sytem is not rebooted
  • he file will be moved to/lost+found directory and can be recovered only by administrator’s intervention
Answer: the file cannot be recovered by a user
Q4 | Executing the ‘cd ..’ command when at the root level causes
  • error message indicating the user can’t access beyond the root level
  • behavior is unix- flavor dependent
  • results in changing to the ‘home’ directory
  • nothing happens
Answer: nothing happens
Q5 | How do you rename file “new” to file “old”?
  • mv new old
  • move new old
  • cp new old
  • rn new old
Answer: mv new old
Q6 | What command is used to copy files and directories?
  • copy
  • cp
  • rn
  • cpy
Answer: cp
Q7 | When mv f1 f2 is executed which file’s inode is freed?
  • f1
  • f2
  • new inode will be used
  • mplementation dependent
Answer: f2
Q8 | Any file’s attribute information is stored in which structure on the disk
  • inode
  • data blocks
  • file blocks
  • directory file
Answer: inode
Q9 | The file permission 764 means
  • every one can read, group can execute only and the owner can read and write
  • every one can read and write, but owner alone can execute
  • every one can read, group including owner can write, owner
  • every one can read and write and execute
Answer: every one can read, group including owner can write, owner
Q10 | The permission -rwxr–r– represented in octal expression will be
  • 777
  • 666
  • 744
  • 711
Answer: 744
Q11 | Effective user id can be set using following permission
  • 777
  • 2666
  • 4744
  • 1711
Answer: 4744
Q12 | Effective group id can be set using following permission
  • 777
  • 2666
  • 4744
  • 1711
Answer: 2666
Q13 | Sticky bit can be set using following permission
  • 777
  • 2666
  • 4744
  • 1711
Answer: 1711
Q14 | The permission -rwSr–r– represented in octal expression will be
  • 777
  • 2666
  • 4744
  • 4644
Answer: 4644
Q15 | The permission -rwxr-sr– represented in octal expression will be
  • 777
  • 2766
  • 2744
  • 2754
Answer: 2754
Q16 | f user tries to remove (rm) a readonly file (444 permission), what will happen?
  • the file is removed successfully (and silently)
  • the rm command prompts for a confirmation, the command is successful upon confirmation
  • he rm command prompts for a confirmation, however the operation fails because of insufficient permissions
  • the rm command fails because of insufficient permissions
Answer: the rm command prompts for a confirmation, the command is successful upon confirmation
Q17 | A user does a chmod operation on a file. Which of the following is true?
  • the last accessed time of the file is updated
  • the last modification time of the file is updated
  • the last change time of the file is updated
  • none of the above
Answer: the last change time of the file is updated
Q18 | If the umask value is 0002. what will be the permissions of new directory
  • 777
  • 775
  • 774
  • 664
Answer: 775
Q19 | What is the command to set the execute permissions to all the files and subdirectories within the directory/home/user1/direct
  • chmod –r +x/home/user1/direct
  • chmod –r +x/home/user1/direct
  • chmod –f –r +x/home/user1/direct
  • chmod –f +x/home/user1/dire ct
Answer: chmod –r +x/home/user1/direct
Answer: chmod –r +x/home/user1/direct
Q20 | The permission -rwxr-xr-t represented in octal expression will be
  • 777
  • 1755
  • 1754
  • 2754
Answer: 1755
Q21 | With a umask value of 112, what is the default permission assigned to newly created regular file?
  • —x–x-wx
  • -rw-rw-r–
  • -r-xr-x-r–
  • -rw-rw-r–
Answer: -rw-rw-r–
Answer: -rw-rw-r–
Q22 | Which command is used to assign read- write permission to the owner?
  • chmod a+r file
  • chmod o+r file
  • chmod u=rw file
  • chmod og-r file
Answer: chmod u=rw file
Q23 | Given the command $ chmod o-w datafile
  • sets write permission to everyone for datafile
  • sets write permission to others for datafile
  • clears write permission to everyone for datafile
  • lears write permission to others for datafile
Answer: lears write permission to others for datafile
Q24 | Which of these commands will set the permissions on file textfile to read and write for the owner, read for the group, and nothing for everyone else?
  • chmod 046 textfile
  • chmod 640 textfile
  • chmod 310 textfile
  • chmod rw r nil textfile
Answer: chmod 640 textfile
Q25 | If you are a root user, how can you grand execute permission only for the owner of the file project1?
  • chmod +x project1
  • chmod u+x project1
  • chmod a+x project1
  • chmod u+x project1
Answer: chmod u+x project1
Answer: chmod u+x project1
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