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

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

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Operating System (OS)
Semaphores

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

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Operating System (OS)
Uniform Symbols Table

a permanent table of decision rules in the form of patterns for matching with the uniform symbol table to discover syntactic structure
consists of a full or partial list of the token's as they appear in the program. Created by Lexical analysis and used for syntax analysis and interpretation
None of these
contains all constants in the program
a permanent table which lists all key words and special symbols of the language in symbolic form

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