Thursday, September 2, 2010

Operating System Question Answer for Competitive Exams

1. Pre-emptive scheduling, is the strategy of temporarily suspending a running process-
Ans: before the CPU time slice expires

2. Mutual exclusion problem occurs -
Ans: among processes that share resources

3. Sector interleaving in disks is done by -
Ans: the operating system

4. Disk scheduling involves deciding-
Ans: the order in which disk access requests must be serviced

5. Dirty bit is used to show the -
Ans: page that is modified after being loaded into cache memory

6. Fence register is used for-
Ans: memory protection.

7. The first-fit, best-fit and worst-fit algorithm can be used for-
Ans: contiguous allocation of memory

8. Give example of single-user operating systems-

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