Operating System (OS)
Feed back queue

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

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

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

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Operating System (OS)
The disadvantages of "Compile and Go" loading scheme is (are):

All of these
None of these
it is necessary to retranslate the user's program deck every time it is run.
a portion of memory is wasted because the core occupied by the assembler is unavailable to the object program.
it is very difficult to handle multiple segments, especially if the source programs are in different languages, and to produce orderly modular programs.

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Operating System (OS)
Most of the microcomputer's operating systems like Apple DOS, MS DOS and PC DOS etc. are called disk operating systems because

they are initially stored on disk
they are available on magnetic tapes
they are partly in primary memory and partly on disk
None of these
they are memory resident

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