21. The process id number of the process vhand,bdflush,sched and init are

A. 1,2,3 1nd 4 

B. 2,3,0 and 1 

C. 3,4,1 and 2 

D. 0,1,2 and 3 

22. If every user working on unix set up is to use the printer,then the printer should be attached to

A. the host machine  

B. any of the terminal 

C. the terminal from wher the first login was made 

D. None of the above 

23. Each entry in inode table is of size

A. 64kb 

B. 32kb 

C. 32bytes 

D. 64bytes 

24. which of the following is the command for the searching a pattern in a file

A. find 

B. grep 

C. lookup 

D. none 

25. When fork() is given

A. It creats a child process 

B. Allocate slot in process table 

C. returns 0 to parent & ID to child 

D. All of the above 

26. Which of the following is not true?

A. sorting is done on the basis of first charecter of each line 

B. sort command sorts a file word by word rather than line by line 

C. sort command has a provision to do a numeric sort 

D. sort is not a filter 

27. The cpu utilization is low when the system is

A. executing 

B. thrasing 

C. waiting 

D. all of the above 

28. A programm can execute more than once simultaneously is called

A. re-executable 

B. re-entrant 

C. multiprogramming 

D. none of the above 

29. __________ scheduler selects the process that is ready to execute to CPU.

A. long-term scheduler 

B. short-term scheduler 

C. medium-term scheduler 

D. None of these 

30. Semaphores are used to solve the problem of

A. Race condition 

B. process syncronisation 

C. mutual exclusion 

D. both b and c 

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