Operating System (OS)
In MS-DOS, relocatable object files and load modules have extensions

.DAS and .EXE, respectively
.OBJ and .COM or .EXE, respectively
.EXE and .OBJ, respectively
None of these
.COM and .OBJ, respectively

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

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

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