操作系统选择题库答案及详解

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1、MultipleChoiceQuestions1Question1Thegeneralroleofanoperatingsystemisto:选择一个答案a.Provideasetofservicestosystemusersb.Managefilesforapplicationprogramsc.Actasaninterfacebetweenvariouscomputersd.NoneoftheaboveFeedback:A.为系统用户提供一系列服务B.为应用程序管理文件(这显然不是)C.作为多台计算机间的接

2、口(应该是CPU与硬件之间的接口)D.errorQuestion2Informationthatmustbesavedpriortotheprocessortransferringcontroltotheinterrupthandlerroutineincludes:选择一个答案a.ProgramStatusWord(PSW)&Contentsofprocessorregistersb.ProgramStatusWord(PSW)c.Noneoftheaboved.ProgramStatusWord(PSW)&

3、LocationofnextinstructionFeedback:D.程序状态字和下个指令的位置P14Question3Oneacceptedmethodofdealingwithmultipleinterruptsisto:选择一个答案a.Servicetheminround-robinfashionb.Disableallinterruptsexceptthoseofhighestpriorityc.Noneoftheaboved.DefineprioritiesfortheinterruptsFeedb

4、ack:处理多个中断的方法P18Thefirstistodisableinterruptswhileaninterruptisbeingprocessed.Asecondapproachistodefineprioritiesforinterruptsandtoallowaninterruptofhigherprioritytocausealower-priorityinterrupthandlertobeinterrupted.A.轮循服务(显然错误)B.只服务优先级高的，忽视优先级低的C.errorD.为这

5、些中断定义优先级Question4Inauniprocessorsystem(单处理器系统),multiprogramming(多道程序设计)increasesprocessorefficiencyby:选择一个答案a.Takingadvantageoftimewastedbylongwaitinterrupthandlingb.Eliminatingallidleprocessorcyclesc.Alloftheaboved.IncreasingprocessorspeedFeedback:A.利用等待中断的

6、时间P18Question5Asoneproceedsdownthememoryhierarchy(i.e.,frominboardmemorytoofflinestorage),thefollowingcondition(s)apply:选择一个答案a.Decreasingcapacityb.Increasingaccesstimec.Alloftheaboved.IncreasingcostperbitFeedback:A.容量↑B.访问时间↑C.errorD.价格↓Question6Small,fastm

7、emorylocatedbetweentheprocessorandmainmemoryiscalled选择一个答案a.WORMmemoryb.CD-RWmemoryc.Noneoftheaboved.CachememoryFeedback:D.存储器的层次结构由上至下依次为：寄存器(processer)，高速缓存，主存储器(memory)，磁盘，磁带Question7Whenanewblockofdataiswrittenintocachememory,thefollowingdetermineswhichc

8、achelocationtheblockwilloccupy:选择一个答案a.Noneoftheaboveb.Cachesizec.Blocksized.WritepolicyFeedback:Nothingwillchange.高速缓冲存储器设计：cachesize，blocksize,mappingfunction,replacementalgorithm,writepolicy.