操作系统习题英文版Word格式文档下载.docx

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12.T/F–Multiprogrammingallowstheprocessortomakeuseofidletimecausedbylong-waitinterrupthandling.

13.T/F–Inatwo-levelmemoryhierarchy,theHitRatioisdefinedasthefractionofallmemoryaccessesfoundintheslowermemory.

14.T/F–Cachememoryexploitstheprincipleoflocalitybyprovidingasmall,fastmemorybetweentheprocessorandmainmemory.

15.T/F–Incachememorydesign,blocksizereferstotheunitofdataexchangedbetweencacheandmainmemory

16.T/F–TheprimaryproblemwithprogrammedI/OisthattheprocessormustwaitfortheI/OmoduletobecomereadyandmustrepeatedlyinterrogatethestatusoftheI/Omodulewhilewaiting.

MultipleChoiceQuestions:

1.Thegeneralroleofanoperatingsystemisto:

a.Actasaninterfacebetweenvariouscomputers

b.Provideasetofservicestosystemusers

c.Managefilesforapplicationprograms

d.Noneoftheabove

2.Thefourmainstructuralelementsofacomputersystemare:

a.Processor,Registers,I/OModules&

MainMemory

b.Processor,Registers,MainMemory&

SystemBus

c.Processor,MainMemory,I/OModules&

3.Thetwobasictypesofprocessorregistersare:

a.User-visibleandControl/Statusregisters

b.ControlandStatusregisters

c.User-visibleanduser-invisibleregisters

4.Addressregistersmaycontain:

a.Memoryaddressesofdata

b.Memoryaddressesofinstructions

c.Partialmemoryaddresses

d.Alloftheabove

5.AControl/Statusregisterthatcontainstheaddressofthenextinstructiontobefetchediscalledthe:

a.InstructionRegister（IR）

b.ProgramCounter（PC）

c.ProgramStatusWord（PSW）

6.Thetwobasicstepsusedbytheprocessorininstructionprocessingare:

a.FetchandInstructioncycles

b.InstructionandExecutecycles

c.FetchandExecutecycles

7.Afetchedinstructionisnormallyloadedintothe:

c.Accumulator（AC）

8.Acommonclassofinterruptsis:

a.Program

b.Timer

c.I/O

9.Whenanexternaldevicebecomesreadytobeservicedbytheprocessor,thedevicesendsthistypeofsignaltotheprocessor:

a.Interruptsignal

b.Haltsignal

c.Handlersignal

10.Informationthatmustbesavedpriortotheprocessortransferringcontroltotheinterrupthandlerroutineincludes:

a.ProcessorStatusWord（PSW）

b.ProcessorStatusWord（PSW）&

Locationofnextinstruction

c.ProcessorStatusWord（PSW）&

Contentsofprocessorregisters

11.Oneacceptedmethodofdealingwithmultipleinterruptsisto:

a.Defineprioritiesfortheinterrupts

b.Disableallinterruptsexceptthoseofhighestpriority

c.Servicetheminround-robinfashion

12.Inauniprocessorsystem,multiprogrammingincreasesprocessorefficiencyby:

a.Increasingprocessorspeed

b.Takingadvantageoftimewastedbylongwaitinterrupthandling

c.Eliminatingallidleprocessorcycles

13.Asoneproceedsdownthememoryhierarchy.,frominboardmemorytoofflinestorage）,thefollowingcondition（s）apply:

a.Increasingcostperbit

b.Decreasingcapacity

c.Increasingaccesstime

14.Small,fastmemorylocatedbetweentheprocessorandmainmemoryiscalled:

a.WORMmemory

b.Cachememory

c.CD-RWmemory

d.Noneoftheabove

15.Whenanewblockofdataiswrittenintocachememory,thefollowingdetermineswhichcachelocationtheblockwilloccupy:

a.Blocksize

b.Cachesize

c.Writepolicy

16.DirectMemoryAccess（DMA）operationsrequirethefollowinginformationfromtheprocessor:

a.AddressofI/Odevice

b.Startingmemorylocationtoreadfromorwriteto

c.Numberofwordstobereadorwritten

Questions

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Problems

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Chapter2–OperatingSystemOverview

1.T/F–Anoperatingsystemcontrolstheexecutionofapplicationsandactsasaninterfacebetweenapplicationsandthecomputerhardware.

2.T/F–Theoperatingsystemmaintainsinformationthatcanbeusedforbillingpurposesonmulti-usersystems.

3.T/F–Theoperatingsystemtypicallyrunsinparallelwithapplicationprograms,onit’sownspecialO/Sprocessor.

4.T/F–Oneofthedrivingforcesinoperatingsystemevolutionisadvancementintheunderlyinghardwaretechnology.

5.T/F–Inthefirstcomputers,usersinteracteddirectlywiththehardwareandoperatingsystemsdidnotexist.

6.T/F–Inabatch-processingsystem,thephrase“controlispassedtoajob”meansthattheprocessorisnowfetchingandexecutinginstructionsinauserprogram.

7.T/F–Uniprogrammingtypicallyprovidesbetterutilizationofsystemresourcesthanmultiprogramming.

8.T/F–Inatimesharingsystem,auser’sprogramispreemptedatregularintervals,butduetorelativelyslowhumanreactiontimethisoccurrenceisusuallytransparenttotheuser.

9.T/F–Aprocesscanbedefinedasaunitofactivitycharacterizedbyasinglesequentialthreadofexecution,acurrentstate,andanassociatedsetofsystemresources.

10.T/F–Avirtualmemoryaddresstypicallyconsistsofapagenumberandanoffsetwithinthepage.

11.T/F–Implementingprioritylevelsisacommonstrategyforshort-termscheduling,whichinvolvesassigningeachprocessinthequeuetotheprocessoraccordingtoitslevelofimportance.

12.T/F–Complexoperatingsystemstodaytypicallyconsistofafewthousandlinesofinstructions.

13.T/F–Amonolithickernelarchitectureassignsonlyafewessentialfunctionstothekernel,includingaddressspaces,interprocesscommunicationandbasicscheduling.

14.T/F–Thehardwareabstractionlayer（HAL）mapsbetweengenerichardwarecommands/responsesandthoseuniquetoaspecificplatform.

17.Aprimaryobjectiveofanoperatingsystemis:

a.Convenience

b.Efficiency

c.Abilitytoevolve

18.Theoperatingsystemprovidesmanytypesofservicestoend-users,programmersandsystemdesigners,including:

a.Built-inuserapplications

b.Errordetectionandresponse

c.Relationaldatabasecapabilitieswiththeinternalfilesystem

19.Theoperatingsystemisunusualinit’sroleasacontrolmechanism,inthat:

a.Itrunsonaspecialprocessor,completelyseparatedfromtherestofthesystem

b.Itfrequentlyrelinquishescontrolofthesystemprocessorandmustdependontheprocessortoregaincontrolofthesystem

c.Itneverrelinquishescontrolofthesystemprocessor

20.Operatingsystemsmustevolveovertimebecause:

a.Hardwaremustbereplacedwhenitfails

b.Userswillonlypurchasesoftwarethathasacurrentcopyrightdate

c.Newhardwareisdesignedandimplementedinthecomputersystem

21.Amajorproblemwithearlyserialprocessingsystemswas:

a.Setuptime

b.Lackofinputdevices

c.Inabilitytogethardcopyoutput

22.Anexampleofahardwarefeaturethatisdesirableinabatch-processingsystemis:

a.Privilegedinstructions

b.Acompletelyaccessiblememoryarea

c.Largeclockcycles

23.Acomputerhardwarefeaturethatisvitaltotheeffectiveoperationofamultiprogrammingoperatingsystemis:

a.Verylargememory

b.Multipleprocessors

c.I/OinterruptsandDMA

24.Theprincipleobjectiveofatimesharing,multiprogrammingsystemisto:

a.Maximizeresponsetime

b.Maximizeprocessoruse

c.Provideexclusiveaccesstohardware

25.Whichofthefollowingmajorlineofcomputersystemdevelopmentcreatedproblemsintimingandsynchronizationthatcontributedtothedevelopmentoftheconceptoftheprocess

a.Multiprogrammingbatchoperationsystems

b.Timesharingsystems

c.Realtimetransactionsystems

26.Thepagingsysteminamemorymanagementsystemprovidesfordynamicmappingbetweenavirtualaddressusedinaprogramand:

a.Avirtualaddressinmainmemory

b.Arealaddressinmainmemory

c.Arealaddressinaprogram

27.Rel