Operating System Architecture Set 4

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This set of Operating System Architecture Multiple Choice Questions & Answers (MCQs) focuses on Operating System Architecture Set 4

Q1 | what is use of ls command ?
  • to list names and attribute of files
  • to list size of files
  • to list length of files
  • none of these
Q2 | Access permission can be set to …………
  • the file owner
  • a file group
  • everyone else
  • all of these
Q3 | The Newly created files are ………….. of the file system directory structure.
  • main nodes
  • root nodes
  • leaf nodes
  • middle nodes
Q4 | Unix system treats devices as a ……..
  • hardware
  • file
  • byte
  • none of these
Q5 | Permission mode on newly created file will be……
  • 0666(octal)
  • 0666(hexadecimal)
  • 0999(octal)
  • 0798(hex)
Q6 | Permission mode 0666(octal) means…………
  • allowing all users acess to file for writing
  • allowing all users acess to file for reading
  • restrict to read and write
  • allowing all users access to file for reading writing
Q7 | All system calls return ……..if open or create call fails
  • -2
  • 0
  • 1
  • -1
Q8 | The open and create system calls returns an integer called a ……….
  • file number
  • file discriptor
  • file variable
  • none of these
Q9 | File discriptor programs uses………………...
  • to delete file
  • to save file
  • for subsequent references for file
  • none of these
Q10 | The read system calls return 0 when………..
  • it reaches middle of file
  • it reaches end of the file
  • file is empty
  • none of these
Q11 | When a process makes a system call ,its mode changes from………
  • user to kernel
  • kernel to user
  • restricted to unrestricted
  • unrestricted to restricted
Q12 | The new process called, child process gets a ………... return value from fork.
  • -1
  • 0
  • 2
  • 1
Q13 | The child process invoke …….to execute program copy .
  • fork
  • execl
  • wait
  • printf
Q14 | Which of the following system calls transforms an executable binary file into a process?
  • fork
  • exec
  • ioct1
  • longjmp
Q15 | Which of the following file names can be found in more than one directory?
  • passwd
  • bin
  • date
  • none of the above
Q16 | The command that can be used to restrict incoming messages to a user is………..
  • mesg
  • halt
  • grep
  • sleep
Q17 | The sort command in UNIX ….
  • used to sort a file
  • used to sort the list of files in a directory
  • both a and b
  • none of the above
Q18 | Which command is used to remove a directory?
  • rd
  • rmdir
  • dldir
  • rdir
Q19 | The tail command in UNIX……
  • can be used to look at the tail or bottom of the file
  • can be used to display the list of last 10 files in the current directory
  • can be used to display the list of last 15 in the current directory
  • none of the above
Q20 | Which command is used to remove a file……
  • rename
  • mv
  • rm
  • del
Q21 | Which command will be used with vi editor to append text at end of line?
  • a
  • i
  • a
  • l
Q22 | Which of the following command the file names in multiple columns?
  • is–x
  • is
  • is–1
  • is–f–x
Q23 | Which command is used to display the device name of the terminal you are using?
  • who
  • ls
  • tty
  • stty
Q24 | Which command allows you to view your file 24 lines at a time ?
  • more
  • cat
  • pg
  • none of the above
Q25 | Which of the following is not a communication command?
  • write
  • mail
  • mesg
  • grep