Operating System (OS)
The CPU, after receiving an interrupt from an I/O device

branches off to the interrupt service routine immediately
hands over control of address bus and data bus to the interrupting device
branches off to the interrupt service routine after completion of the current instruction
halts for a predetermined time
None of these

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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
a permanent table of decision rules in the form of patterns for matching with the uniform symbol table to discover syntactic structure
contains all constants in the program
None of these
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

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