OPERATING SYSTEMS QUESTIONS
WITH ANSWERS 2025
Long-TermASchedulerA-AcorrectAanswers-AAlong-
termAschedulerAdeterminesAwhichAprogramsAareAadmittedAtoAtheAsystemAforAprocessing.A
ProgramsAareAsetAupAinAtheAqueueAandAthenAtheAbestAjobAisAselected.AItAtakesAtheAprocess
esAfromAtheAjobApool.ATheAlong-termAschedulerAregulatesAtheADegreeAofAMulti-
programmingA(DOM).ALong-termAschedulerAcanAalsoAbeAreferredAtoAasAJobAScheduler.
Short-TermASchedulerA-AcorrectAanswers-TheAShort-
TermASchedulerA(orACPUAScheduler)ApicksAprocessesAfromAtheAReadyAQueueAthatAareAre
adyAforAexecutionAandAassignAthemAtoAaACPUAforAexecution.AItAhasAlessAcontrolAoverAtheAD
OM.
ExplainAtheAmainAdifferencesAbetweenAtheAshort-termAschedulerAandAlong-
termAscheduler.A-AcorrectAanswers-TheAShort-
TermASchedulerAexecutesAmoreAthanAtheALong-TermAScheduler.ATheALong-
TermASchedulerApicksAupAprocessesAfromAtheAJobAPool/JobAQueue,AwhereasAtheAShort-
TermASchedulerApicksAupAtheAprocessesAfromAtheAReadyAQueue.ATheALong-
TermASchedulerAselectsAprocessesAlessAfrequentlyAthanAtheAShort-
TermAScheduler.ATheALong-
TermASchedulerAhasAmoreAcontrolAoverAtheADegreeAofAMultiprogrammingAthenAtheAShort-
TermAScheduler.
ExplainAtheAconceptAofAaAcontextAswitch.A-AcorrectAanswers-
AAcontextAswitchAisAaAprocedureAthatAtheACPUAfollowsAtoAchangeAprocessesAwhileAensurin
gAthatAtheAtasksAdoAnotAconflict.AItAallowsAprocessesAtoAshareAaAsingleACPU.AContextAswitc
hingAallowsAforAseamlessAmultitasking.AInAmultitasking,AtheAtermA"context"ArefersAtoAtheAst
oringAofAtheAsystemAstateAforAaAtask,AthatAtaskAcanAbeApaused,AandAaAdifferentAtaskAcouldA
beAstarted.AAnAinterruptAcanAalsoAcauseAaAcontextAswitch.ASomeAOSAneedAaAcontextAswitc
hAtoAswitchAfromAuserAmodeAtoAkernelAmode.AInAaACPU,AtheAtermA"context"ArefersAtoAdataAc
ontainedAinAregistersAandAprogramAcounterAatAaAspecificAmomentAinAtime.
RemoteAProcedureACallA(RPC)A-AcorrectAanswers-
AAprotocolAthatAenablesAaAprocessAonAoneAcomputerAtoAcallAaAprocessAonAanotherAcomput
er.
MultithreadedAProgrammingA-AcorrectAanswers-
MultithreadingAasAaAwidespreadAprogrammingAandAexecutionAmodelAallowsAmultipleAthrea
dsAtoAexistAwithinAtheAcontextAofAaAsingleAprocess.ATheseAthreadsAshareAtheAprocess'Areso
urcesAbutAareAableAtoAexecuteAindependently.
BrieflyAdescribeAtheAbenefitsAforAmultithreadedAprogrammingAthatAareApresentedAbyAmultic
oreAsystems.A-AcorrectAanswers-
MultithreadedAprogrammingAprovidesAaAmechanismAforAmoreAefficientAuseAofAtheseAmultip
leAcomputingAcoresAandAimprovedAconcurrency.AOnAaAsystemAwithAoneAcomputingAcore,At
hatAtheAexecutionAofAtheAthreadsAwillAbeAincorporatedAoverAtime,AbecauseAonlyAoneAthread
AcanAbeAexecutedAatAaAtime.AOnAaAsystemAwithAmultipleAcores,AthreadsAcanArunAinAparallel,
AbecauseAtheAsystemAcanAallocateAaAseparateAthreadAtoAeachAcore.
WITH ANSWERS 2025
Long-TermASchedulerA-AcorrectAanswers-AAlong-
termAschedulerAdeterminesAwhichAprogramsAareAadmittedAtoAtheAsystemAforAprocessing.A
ProgramsAareAsetAupAinAtheAqueueAandAthenAtheAbestAjobAisAselected.AItAtakesAtheAprocess
esAfromAtheAjobApool.ATheAlong-termAschedulerAregulatesAtheADegreeAofAMulti-
programmingA(DOM).ALong-termAschedulerAcanAalsoAbeAreferredAtoAasAJobAScheduler.
Short-TermASchedulerA-AcorrectAanswers-TheAShort-
TermASchedulerA(orACPUAScheduler)ApicksAprocessesAfromAtheAReadyAQueueAthatAareAre
adyAforAexecutionAandAassignAthemAtoAaACPUAforAexecution.AItAhasAlessAcontrolAoverAtheAD
OM.
ExplainAtheAmainAdifferencesAbetweenAtheAshort-termAschedulerAandAlong-
termAscheduler.A-AcorrectAanswers-TheAShort-
TermASchedulerAexecutesAmoreAthanAtheALong-TermAScheduler.ATheALong-
TermASchedulerApicksAupAprocessesAfromAtheAJobAPool/JobAQueue,AwhereasAtheAShort-
TermASchedulerApicksAupAtheAprocessesAfromAtheAReadyAQueue.ATheALong-
TermASchedulerAselectsAprocessesAlessAfrequentlyAthanAtheAShort-
TermAScheduler.ATheALong-
TermASchedulerAhasAmoreAcontrolAoverAtheADegreeAofAMultiprogrammingAthenAtheAShort-
TermAScheduler.
ExplainAtheAconceptAofAaAcontextAswitch.A-AcorrectAanswers-
AAcontextAswitchAisAaAprocedureAthatAtheACPUAfollowsAtoAchangeAprocessesAwhileAensurin
gAthatAtheAtasksAdoAnotAconflict.AItAallowsAprocessesAtoAshareAaAsingleACPU.AContextAswitc
hingAallowsAforAseamlessAmultitasking.AInAmultitasking,AtheAtermA"context"ArefersAtoAtheAst
oringAofAtheAsystemAstateAforAaAtask,AthatAtaskAcanAbeApaused,AandAaAdifferentAtaskAcouldA
beAstarted.AAnAinterruptAcanAalsoAcauseAaAcontextAswitch.ASomeAOSAneedAaAcontextAswitc
hAtoAswitchAfromAuserAmodeAtoAkernelAmode.AInAaACPU,AtheAtermA"context"ArefersAtoAdataAc
ontainedAinAregistersAandAprogramAcounterAatAaAspecificAmomentAinAtime.
RemoteAProcedureACallA(RPC)A-AcorrectAanswers-
AAprotocolAthatAenablesAaAprocessAonAoneAcomputerAtoAcallAaAprocessAonAanotherAcomput
er.
MultithreadedAProgrammingA-AcorrectAanswers-
MultithreadingAasAaAwidespreadAprogrammingAandAexecutionAmodelAallowsAmultipleAthrea
dsAtoAexistAwithinAtheAcontextAofAaAsingleAprocess.ATheseAthreadsAshareAtheAprocess'Areso
urcesAbutAareAableAtoAexecuteAindependently.
BrieflyAdescribeAtheAbenefitsAforAmultithreadedAprogrammingAthatAareApresentedAbyAmultic
oreAsystems.A-AcorrectAanswers-
MultithreadedAprogrammingAprovidesAaAmechanismAforAmoreAefficientAuseAofAtheseAmultip
leAcomputingAcoresAandAimprovedAconcurrency.AOnAaAsystemAwithAoneAcomputingAcore,At
hatAtheAexecutionAofAtheAthreadsAwillAbeAincorporatedAoverAtime,AbecauseAonlyAoneAthread
AcanAbeAexecutedAatAaAtime.AOnAaAsystemAwithAmultipleAcores,AthreadsAcanArunAinAparallel,
AbecauseAtheAsystemAcanAallocateAaAseparateAthreadAtoAeachAcore.
