Operating System (OS)
An incremental backup

saves only files that have recently changed
uses more tapes
None of these
should be done each month
saves all files

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Operating System (OS)
The term 'polling' in a computer means a process by which a computer system

multiplexes the inputs and updates the memory accordingly
detects/corrects errors
decides correct alternative by analysing several ones
inquires to see if a terminal has any transaction to send
None of these

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Operating System (OS)
Thrashing can be avoided if

the speed of I/O processor is increased
the pages, belonging to the working set of the programs, are in main memory
the speed of CPU is increased
All of these
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
None of these
a permanent table which lists all key words and special symbols of the language in symbolic form
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
contains all constants in the program

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