Operating System (OS)
Non-modifiable procedures are called

serially usable procedures
topdown procedures
concurrent procedures
None of these
reentrant procedures

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Operating System (OS)
A critical region is

none is the above
one which is enclosed by a pair of P and V operations on semaphores
a program segment where shared resources are accessed
a program segment that often causes unexpected system crashes
a program segment that has not been proved bug-free

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Operating System (OS)
Which of the following statement is true.

None of these
Thrashing is a natural consequence of virtual memory systems.
Seek analysis is used for analysing control-unit busy problems.
All of these
The LRU algorithm pages out pages that have been used recently

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