1

GATE CSE 1989

Subjective

+2

-0

How many sub strings can be formed from a character string of length $$n$$?

2

GATE CSE 1989

Subjective

+2

-0

Which of the following graphs is / are planar? (see fig.)

3

GATE CSE 1989

Subjective

+2

-0

Match the pairs in the following question.

**List - $${\rm I}$$**

$$(A)$$$$\,\,\,\,$$ Virtual Memory

$$(B)$$$$\,\,\,\,$$ Shared memory

$$(C)$$$$\,\,\,\,$$ Look-ahead buffer

$$(D)$$$$\,\,\,\,$$ Look-aside buffer

**List - $${\rm II}$$**

$$(p)$$$$\,\,\,\,$$ Temporal locality

$$(q)$$$$\,\,\,\,$$ Spatial Locality

$$(r)$$$$\,\,\,\,$$ Address Translation

$$(s)$$$$\,\,\,\,$$ Mutual exclusion

4

GATE CSE 1989

Subjective

+2

-0

Disk requests come to disk driver for cylinders $$10,22,20,2,40,56$$ and $$38,$$ in that order at a time when the disk drive is reading from cylinder $$20.$$ The seek time is $$6msec$$ per cylinder. Compute the total seek time if the disk arm scheduling algorithm is

(a) First come first served

(b) Closest cylinder next.

(a) First come first served

(b) Closest cylinder next.

Paper analysis

Total Questions

Discrete Mathematics

3

Operating Systems

2

Programming Languages

2

Theory of Computation

4

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