Operating System (OS)
A disk scheduling algorithm in an operating system causes the disk arm to move back and forth across the disk surface in order to service all requests in its path. This is a

First come first served
FIFO
Scan
Shortest Seek Time First (SSTE)
None of these

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

to build a uniform symbol table
None of these
to build a literal table and an identifier table
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.
to parse the source program into the basic elements or tokens of the language.

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