UGC NET CS 2015 Dec - II

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Question 1

Loop unrolling is a code optimization technique:
  • that avoids tests at every iteration of the loop.
  • that improves performance by decreasing the number of instructions in a basic block.
  • that exchanges inner loops with outer loops
  • that reorders operations to allow multiple computations to happen in parallel
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Question 2

In C++, which system - provided function is called when no handler is provided to deal with an exception?
  • terminate ( )
  • unexpected ( )
  • abort ( )
  • kill ( )
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Question 3

System calls are usually invoked by using :
  • A privileged instruction
  • An indirect jump
  • A software interrupt
  • Polling
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Question 4

Which of the following services is not provided by wireless access point in 802.11 WLAN ?
  • Association
  • Disassociation
  • Error correction
  • Integration
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Question 5

Consider a disk with 16384 bytes per track having a rotation time of 16 msec and average seek time of 40 msec. What is the time in msec to read a block of 1024 bytes from this disk?
  • 57 sec
  • 49 sec
  • 48 sec
  • 17 sec
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Question 6

Suppose that the number of instructions executed between page fault is directly proportional to the number of page frames allocated to a program. If the available memory is doubled, the mean interval between page faults is also doubled. Further, consider that a normal instruction takes one microsecond, but if a page fault occurs, it takes 2001 microseconds. If a program takes 60 sec to run, during which time it gets 15,000 page faults, how long would it take to run if twice as much memory were available?
  • 60 sec
  • 30 sec
  • 45 sec
  • 10 sec
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Question 7

In general, in a recursive and non-recursive implementation of a problem (program) :

  • Both time and space complexities are better in recursive than in non-recursive program.

  • Both time and space complexities are better in non-recursive than in recursive program

  • Time complexity is better in recursive version but space complexity is better in non-recursive version of the program.

  • Space complexity is better in recursive version but time complexity is better in non-recursive version of the program.

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Question 8

Which of the following provides the best description of an entity type?
  • A specific concrete object with a defined set of processes (e.g. Jatin with diabetes)
  • A value given to a particular attribute (e.g. height - 230 cm)
  • A thing that we wish to collect data about zero or more, possibly real world examples of it may exist
  • A template for a group of things with the same set of characteristics that may exist in the real world
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Question 9

A relation R = {A, B, C, D, E, F,G} is given with following set of functional dependencies: F = {AD → E, BE → F, B → C, AF → G} Which of the following is a candidate key ?
  • A
  • AB
  • ABC
  • ABD
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Question 10

Data which improves the performance and accessibility of the database are called:
  • Indexes
  • User Data
  • Application Metadata
  • Data Dictionary
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