Operating System (OS)
Virtual Memory

consists of those addresses that may be generated by a processor during execution of a computation.
allows multiple programs to reside in separate areas of core at the time.
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.
None of these
is a method of allocating processor time.

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

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

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