Chapter-2-Q&A

OperatingSystemsChapter2–OperatingSystemOverviewPage1of6Chapter2–OperatingSystemOverviewTrue/FalseQuestions:1.T/F–Anoperatingsystemcontrolstheexecutionofapplicationsandactsasaninterfacebetweenapplicationsandthecomputerhardware.ANS:T2.T/F–Theoperatingsystemmaintainsinformationthatcanbeusedforbillingpurposesonmulti-usersystems.ANS:T3.T/F–Theoperatingsystemtypicallyrunsinparallelwithapplicationprograms,onit’sownspecialO/Sprocessor.ANS:F(O/Stypicallyrunsonsameprocessorandrelinquishescontrolasnecessary)4.T/F–Oneofthedrivingforcesinoperatingsystemevolutionisadvancementintheunderlyinghardwaretechnology.ANS:T5.T/F–Inthefirstcomputers,usersinteracteddirectlywiththehardwareandoperatingsystemsdidnotexist.ANS:T6.T/F–Inabatch-processingsystem,thephrase“controlispassedtoajob”meansthattheprocessorisnowfetchingandexecutinginstructionsinauserprogram.ANS:T7.T/F–Uniprogrammingtypicallyprovidesbetterutilizationofsystemresourcesthanmultiprogramming.ANS:F(oppositeistrue)8.T/F–Inatimesharingsystem,auser’sprogramispreemptedatregularintervals,butduetorelativelyslowhumanreactiontimethisoccurrenceisusuallytransparenttotheuser.ANS:T9.T/F–Aprocesscanbedefinedasaunitofactivitycharacterizedbyasinglesequentialthreadofexecution,acurrentstate,andanassociatedsetofsystemresources.ANS:T10.T/F–Avirtualmemoryaddresstypicallyconsistsofapagenumberandanoffsetwithinthepage.OperatingSystemsChapter2–OperatingSystemOverviewPage2of6ANS:T11.T/F–Implementingprioritylevelsisacommonstrategyforshort-termscheduling,whichinvolvesassigningeachprocessinthequeuetotheprocessoraccordingtoitslevelofimportance.ANS:T12.T/F–Complexoperatingsystemstodaytypicallyconsistofafewthousandlinesofinstructions.ANS:F(hundredsofthousandsormillions)13.T/F–Amonolithickernelarchitectureassignsonlyafewessentialfunctionstothekernel,includingaddressspaces,interprocesscommunicationandbasicscheduling.ANS:F(most/allO/Sfunctionalityisincluded)14.T/F–Thehardwareabstractionlayer(HAL)mapsbetweengenerichardwarecommands/responsesandthoseuniquetoaspecificplatform.ANS:T15.T/F–LinuxisoneexampleofamodernUNIXsystemthatimplementsamodulararchitecture.ANS:TMultipleChoiceQuestions:1.Aprimaryobjectiveofanoperatingsystemis:a.Convenienceb.Efficiencyc.Abilitytoevolved.AlloftheaboveANS:D2.Theoperatingsystemprovidesmanytypesofservicestoend-users,programmersandsystemdesigners,including:a.Built-inuserapplicationsb.Errordetectionandresponsec.Relationaldatabasecapabilitieswiththeinternalfilesystemd.AlloftheaboveANS:B3.Theoperatingsystemisunusualinit’sroleasacontrolmechanism,inthat:a.Itrunsonaspecialprocessor,completelyseparatedfromtherestofthesystemb.Itfrequentlyrelinquishescontrolofthesystemprocessorandmustdependontheprocessortoregaincontrolofthesystemc.ItneverrelinquishescontrolofthesystemprocessorOperatingSystemsChapter2–OperatingSystemOverviewPage3of6d.NoneoftheaboveANS:B4.Operatingsystemsmustevolveovertimebecause:a.Hardwaremustbereplacedwhenitfailsb.Userswillonlypurchasesoftwarethathasacurrentcopyrightdatec.Newhardwareisdesignedandimplementedinthecomputersystemd.AlloftheaboveANS:C5.Amajorproblemwithearlyserialprocessingsystemswas:a.Setuptimeb.Lackofinputdevicesc.Inabilitytogethardcopyoutputd.AlloftheaboveANS:A6.Anexampleofahardwarefeaturethatisdesirableinabatch-processingsystemis:a.Privilegedinstructionsb.Acompletelyaccessiblememoryareac.Largeclockcyclesd.NoneoftheaboveANS:A7.Acomputerhardwarefeaturethatisvitaltotheeffectiveoperationofamultiprogrammingoperatingsystemis:a.Verylargememoryb.Multipleprocessorsc.I/OinterruptsandDMAd.AlloftheaboveANS:C8.Theprincipleobjectiveofatimesharing,multiprogrammingsystemisto:a.Maximizeresponsetimeb.Maximizeprocessorusec.Provideexclusiveaccesstohardwared.NoneoftheaboveANS:D9.Whichofthefollowingmajorlineofcomputersystemdevelopmentcreatedproblemsintimingandsynchronizationthatcontributedtothedevelopmentoftheconceptoftheprocess?a.Multiprogrammingbatchoperationsystemsb.Timesharingsystemsc.RealtimetransactionsystemsOperatingSystemsChapter2–OperatingSystemOverviewPage4of6d.AlloftheaboveANS:D10.Thepagingsysteminamemorymanagementsystemprovidesfordynamicmappingbetweenavirtualaddressusedinaprogramand:a.Avirtualaddressinmainmemoryb.Arealaddressinmainmemoryc.Arealaddressinaprogramd.NoneoftheaboveANS:B11.Relativetoinformationprotectionandsecurityincomputersystems,accesscontroltypicallyrefersto:a.Provingthatsecuritymechanismsperformaccordingtospecificationb.Theflowofdatawithinthesystemc.Regulatinguserandprocessaccesstovariousaspectsofthesystemd.NoneoftheaboveANS:C12.Acommonproblemwithfull-featuredoperatingsystems,duetotheirsizeanddifficultyofthetaskstheyaddress,is:a.Chronicallylateindeliveryb.Latentbugsthatshowupinthefieldc.Sub-parperformanced.AlloftheaboveANS:D13.Atechniqueinwhichaprocess,executinganapplication,isdividedintothreadsthatcanrunconcurrentlyiscalled:a.Multithreadingb.Multiprocessingc.Symmetricmultiprocessing(SMP)d.NoneoftheaboveANS:A14.WIN2Ksupportsseveraltypesofuserapplications,including:a.WIN32b.Linuxc.System10d.NoneoftheaboveANS:A15.KeytothesuccessofLinuxhasbeenit’scharacter