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This set of Operating System Architecture Multiple Choice Questions & Answers (MCQs) focuses on Operating System Architecture Set 3
Q1 | Which command makes an empty directory
- mkdirectory
- makedirectory
- mkdir
- newdir
Q2 | Why is man command used
- to shut down
- search all files
- deleting files
- getting help command on format
Q3 | Which of the following features of unix may be used for interprocess communication
- signals
- pipes
- semaphores
- all of these
Q4 | In a system,if 5 people are currently using the vi editor,then the number of corresponding processes will be
- 1
- 5
- 2
Q5 | The command echo welcome >/dev/tty
- echoes welcome in all the terminals that are switched on
- echoes welcome in all the " that are logged on
- echoes welcome only in the terminal in which it is run
- both (a) and ( c)
Q6 | /dev/null
- is a file
- has write permission for all
- is the unix builtin dustbin
- all of these
Q7 | The advantage of binary files over text files is that
- it is compact
- it can be accessed faster
- they are more reliable
- all of these
Q8 | The permission bits of a filenoname,can be set to - rws - - * - - * by the command
- chmod 711 noname
- chmod go -rw noname
- chmod 2711 noname
- none of above
Q9 | /bin/passwork has the user execution permission set to 's' because
- this facility assigns to the user, permissions of the program owner temporarily
- it should allow users who don\t have write permission to/etc/passwd to write to it
- /etc/passwd is write protected
- all of these
Q10 | If are does not want anyone else to read or write to a file named datfile,except through a program in a file filex,then he may use
- chmod u+s filex; chmod go -rw datfile
- chmod 4711 filex; chmod go -rw datfile
- chmod 4711 datfile; chmod go - rw filex
- both a & b
Q11 | Writing a c program that accepts input from keyboard,rather than from a file is advantageous because
- keyboard is a file that is already open
- it can be used in a pipe,if it writes to stdout
- both a & b
- non of above
Q12 | Consider the following program main ( ){ printf ("Aayush won a football match on\n"); system ("date");printf("In Berlin"); } if a.out is the executable code corresponding to the above source code,then the command a.out >out f
- redirects the output of date to a file out f
- displays the output of date on the screen
- prints everything on screen
- prints the two messages on the screen
Q13 | The Hardware at centre of UNIX system provides………….
- basic services
- operating system with basic services
- kernel service
- none of these
Q14 | Operating System is also called as ……….
- system kernel
- kernel
- both a and b
- none of these
Q15 | Program such as Shell and editors interact with kernel by invoking ……….
- process
- thread
- system calls
- none of these
Q16 | …………responsible for exchanging data between kernel and programs
- system calls
- thread
- process
- none of these
Q17 | what is a.out ?
- system user program
- private user program
- local program
- none of these
Q18 | How many system calls in system V
- 32
- 64
- 128
- 16
Q19 | Out of 64 system calls in system V how many are frequently used…
- 64
- 32
- 16
- 128
Q20 | Non leaf node of the file system structure is…………..
- leaf node of file
- directory of file
- regular file
- path name
Q21 | Full path name starts with …..
- dot
- slash
- double slash
- non of these
Q22 | Text formatting program troff find…………. character at the end of each line
- newline
- slash
- dot
- none of these
Q23 | System accounting program acctcom find……….
- variable length record
- fixed length record
- no record
- none of these
Q24 | Directories are …….
- fixed files
- regular files
- variable files
- none of these
Q25 | System treats the data in a directory as a……………..
- byte stream
- bit stream
- stream
- none of these