UGC NET COMPUTER SCIENCE SOLVED PAPERS 2017-19 - UGC NET Computer Science November 2017 Paper 3

48. In Software Configuration Management (SCM), which of the following is a use-case supported by standard version control systems?
(a) Managing several versions or releases of a software
(b) Filing bug reports and tracking their progress
(c) Allowing team members to work in parallel
(d) Identifying when and where a regression occurred

  • Option : A
  • Explanation :
    Managing several versions or releases of a software is manged by SCM Filing bug reports and tracking their progressis not manged by SCM Allowing team members to work in parallel is manged by SCM Identifying when and where a regression occurred is manged by SCM So, option (A) is correct.
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49. Consider the following four processes with the arrival time and length of CPU burst given in milliseconds :

ProcessArrival TimeBurst Time
P108
P214
P329
P435
 The average waiting time for preemptive SJF scheduling algorithm is __________.

  • Option : A
  • Explanation :
    First we will make gantt chart of given process then we will calculate turn around time and waiting time of individual process.
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    Now we have to calculate average waiting time for schedule:
    avg waiting time = wt(P1 + P2 + P3 + P4 )/number of process.
    ie. (9 + 0 + 15 + 2) / 4
    = 26 / 4
    = 6.5
    So, option (A) is correct.
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50. Consider a virtual page reference string 7, 0, 1, 2, 0, 3, 0, 4, 2, 3, 0, 3, 2, 1, 2, 0, 1, 7, 0, 1 Suppose a demand paged virtual memory system running on a computer system such that the main memory has 3 page frames. Then __________ page replacement algorithm has minimum number of page faults.

  • Option : D
  • Explanation :
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    1. In FIFO algorithm 15 page fault will occur.
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    2. In LIFO algorithm 11 page fault will occur.
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    3. In LRU algorithm 12 page fault will occur.
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    4.In optimal algorithm 9 page fault will occur.
    So, option (D) will be correct.
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