operating system Practice Questions Answers Test with Solutions & More Shortcuts

Question : 16

An unpaged cache associates disk domains with the address of the read and continues for a specific length. The major disadvantage of unpaged cache is that

a) it allows cache domain to contain redundant data

b) it does not allow writes to be cached

c) its access time is greater than that of paged caching

d) read ahead cache domain blocks are necessarily fixed in size

Question : 17

In the pure User Level Threads (ULT) (i) Thread management is done by application, (ii) Thread management is done by kernel, (iii) Kernel is not aware of the existence of thread, (iv) Application program interface (API) to the kernel thread facility.

a) i, iii are true

b) i, ii and iii are true

c) All are false

d) None of these are true

Question : 18

The access time in disk scheduling is

a) The time taken to position the head at the track.

b) The time taken to reach the beginning of the sector of the track.

c) The sum of seek time and rotational delay.

d) None of these.

Question : 19

The following RAID level employer parallel access technique and single redundant disk

a) RAID level 0

b) RAID level 1

c) RAID level 2

d) RAID level 3

Question : 20

A disk scheduling algorithm in an operating system causes the disk arm to seek back and forth access the disc surface servicing all request in its path, this is a

a) first come first served

b) shortest seek time first

c) scan

d) None of these