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

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

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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)
Trojan-Horse programs

are legitimate programs that allow unauthorized access
do not usually work
None of these
are hidden programs that do not show up on the system
usually are immediately discovered

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