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
None of these
inquires to see if a terminal has any transaction to send
decides correct alternative by analysing several ones

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Operating System (OS)
The function(s) of the Syntax phase is(are)

to build a literal table and an identifier table
None of these
to build a uniform symbol table
to parse the source program into the basic elements or tokens of the language.
to recognize the major constructs of the language and to call the appropriate action routines that will generate the intermediate form or matrix for these constructs.

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Operating System (OS)
Seeks analysis

is used for analyzing paging problems
is used for analyzing device busy problems
None of these
is used for analyzing control-unit busy problems
is only shown on real-time displays

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