Systems Programming Multiple choice Questions and Answers-UGC NET computer science question paper

71.	A Top-down Parse generates:
a.	Right-most derivation
b.	Right-most derivation in reverse
c.	Left-most derivation
d.	Left-most derivation in reverse

Discuss

Answer: (c).Left-most derivation

72.	In an absolute loading scheme, which loader function is accomplished by programmer?
a.	Allocation
b.	Linking
c.	Reallocation
d.	Both a and b

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Answer: (d).Both a and b

73.	Symbol table can be used for:
a.	Checking type compatibility
b.	Suppressing duplication of error message
c.	Storage allocation
d.	All of these above

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Answer: (d).All of these above

74.	Linking:
a.	cannot be performed before relocation
b.	cannot be performed after relocation
c.	can be performed both before and after relocation
d.	is not required if relocation is performed

Discuss

Answer: (b).cannot be performed after relocation

75.	Which of the following is the most general phase-structured grammar ?
a.	Regular
b.	Context-sensitive
c.	Context free
d.	Syntax tree

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Answer: (b).Context-sensitive

76.	A compiler for a high level language that runs on one machine and produces code for a different machine is called:
a.	Optimizing
b.	One pass compiler
c.	Cross compiler
d.	Multipass compiler

Discuss

Answer: (c).Cross compiler

Discuss

Answer: (d).None of these

78.	Peep-hole optimization is a form of:
a.	loop optimization
b.	local optimization
c.	constant folding
d.	data flow analysis

Discuss

Answer: (c).constant folding

79.	An operating system is:
a.	Collection of hardware components
b.	Collection of input-output devices
c.	Collection of software routines
d.	All the above

Discuss

Answer: (c).Collection of software routines

80.	A permanent database of a general model of compiler is...................
a.	Identifier table
b.	Page map table
c.	Literal table
d.	Terminal table

Discuss

Answer: (d).Terminal table