Operating System (OS)
All of the following are task performed by the operating system except

Provides an interface for user to interact with computer
Controlling the access that application program has to the CPU
Performing housekeeping task like file compression and disk defragmentation
Managing hardware on the computer

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Operating System (OS)
The dispatcher

never changes task priorities
actually schedules the tasks into the processor
is always small and simple
puts tasks in I/O wait
None of these

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Operating System (OS)
Multiprogramming

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

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Operating System (OS)
Uniform Symbols Table

a permanent table which lists all key words and special symbols of the language in symbolic form
contains all constants in the program
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
a permanent table of decision rules in the form of patterns for matching with the uniform symbol table to discover syntactic structure

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