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

a portion of memory is wasted because the core occupied by the assembler is unavailable to the object program.
None of these
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
it is necessary to retranslate the user's program deck every time it is run.

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Operating System (OS)
The term "operating system" means

None of these
conversion of high level language into machine code
a set of programs which controls computer working
the way a floppy disk drive operates
the way a computer operator works

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Operating System (OS)
Semaphores

synchronize critical resources to prevent deadlock
are used to do I/O
synchronize critical resources to prevent contention
are used for memory management
None of these

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