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


bWait queue


cReady queue


dAging


View Answer Aging

What is ‘Aging’?


akeeping track of cache contents


bkeeping track of what pages are currently residing in memory


ckeeping track of how many times a given page is referenced


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


cthe current CPU burst


danything the user wants



Preemptive Shortest Job First scheduling is sometimes called ____________


aFast SJF scheduling


bEDF scheduling – Earliest Deadline First


cHRRN scheduling – Highest Response Ratio Next


dSRTN scheduling – Shortest Remaining Time Next



The FCFS algorithm is particularly troublesome for ____________


atime sharing systems


bmultiprogramming systems


cmultiprocessor systems


doperating systems



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


dnone of the mentioned



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