operating system Practice Questions Answers Test with Solutions & More Shortcuts

Question : 16

The UNIX scheduling gives

a) Highest preference to real time processes

b) Highest preference to kernel mode processes

c) Highest preference to user mode processes

d) Highest preference to shared processes.

Question : 17

In multi processor scheduling : A: Course gained parallelism, B: Medium grained parallelism, C: Fine grained parallelism; 1- Concurrent processes running on a multi programmed uni- processor. 2- Parallel processing or multi tasking is done within a single application. 3- Parallel processing is done within a single instruction stream.

a) A - 1, B - 2, C - 3

b) A - 2, B - 3, C - 1

c) A - 3, B - 2, C - 1

d) A - 1, B - 3, C - 2

Question : 18

In virtual memory management, when local control policy is applied

a) It determines the number of processes that are to be resident in main memory.

b) It determines the number of processes that are to be resident in virtual memory.

c) It determines when a modified page should be written out to secondary memory.

d) None of these.

Question : 19

In shortest service time first policy, applied on disk scheduling, the disk request is selected

a) That requires the least movement of disk arm from its current position.

b) That requires the maximum movement of disk arm from its current position.

c) That is recently received.

d) On random.

Question : 20

In disk storage devices, data are recorded on and later retrieved from disk via a conducting coil named

a) Tail

b) Foot

c) Head

d) Hand.