Operating System Mcqs

Page No. 12

Round robin scheduling falls under the category of ____________


aNon-preemptive scheduling

✖


bPreemptive scheduling

✓


cAll of the mentioned

✖


dNone of the mentioned

✖


View Answer Preemptive scheduling

Which of the following scheduling algorithms gives minimum average waiting time?


aFCFS

✖


bSJF

✓


cRound – robin

✖


dPriority

✖


View Answer SJF

Which of the following statements are true? (GATE 2010)
i) Shortest remaining time first scheduling may cause starvation
ii) Preemptive scheduling may cause starvation
iii) Round robin is better than FCFS in terms of response time


ai only

✖


bi and iii only

✖


cii and iii only

✖


di, ii and iii

✓


View Answer i, ii and iii

A solution to the problem of indefinite blockage of low – priority processes is ____________


aStarvation

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bWait queue

✖


cReady queue

✖


dAging

✓


View Answer Aging

What is ‘Aging’?


akeeping track of cache contents

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bkeeping track of what pages are currently residing in memory

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ckeeping track of how many times a given page is referenced

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dincreasing the priority of jobs to ensure termination in a finite time

✓



Choose one of the disadvantages of the priority scheduling algorithm?


ait schedules in a very complex manner

✖


bits scheduling takes up a lot of time

✖


cit schedules in a very complex manner

✓


dnone of the mentioned

✖



An SJF algorithm is simply a priority algorithm where the priority is ____________


athe predicted next CPU burst

✓


bthe inverse of the predicted next CPU burst

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cthe current CPU burst

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danything the user wants

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Preemptive Shortest Job First scheduling is sometimes called ____________


aFast SJF scheduling

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bEDF scheduling – Earliest Deadline First

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cHRRN scheduling – Highest Response Ratio Next

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dSRTN scheduling – Shortest Remaining Time Next

✓



The FCFS algorithm is particularly troublesome for ____________


atime sharing systems

✖


bmultiprogramming systems

✓


cmultiprocessor systems

✖


doperating systems

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The real difficulty with SJF in short term scheduling is ____________


ait is too good an algorithm

✖


bknowing the length of the next CPU request

✓


cit is too complex to understand

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dnone of the mentioned

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