Operating System (OS)
A critical region is

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
one which is enclosed by a pair of P and V operations on semaphores
none is the above

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Operating System (OS)
Multiprogramming

None of these
is a method of allocating processor time.
consists of those addresses that may be generated by a processor during execution of a computation.
is a method of memory allocation by which the program is subdivided into equal portions, or pages and core is subdivided into equal portions or blocks.
allows multiple programs to reside in separate areas of core at the time.

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Operating System (OS)
Identify false statement

You can restore any files in recycle bin if you ever need
You can increase free space of disk by sending files in recycle bin
You can right click and choose Empty Recycle Bin to clean it at once
You can find deleted files in recycle bin

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Operating System (OS)
Feed back queue

are very easy to implement
dispatch tasks according to execution characteristics
are used to favor real-time tasks
require manual intervention to implement properly
None of these

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