Ocr Computing Exam Questions And Answers

OCR COMPUTING EXAM QUESTIONS
AND ANSWERS

(2013)bExplainbwhatbisbmeantbbybanbinterruptb-banswer--
Interruptbsentbtobthebprocessorb
Requestbforbprocessingbtimeb
Allowsbimportantbtasksbtobbebprocessed

(2013)bStatebtwobtypesbofbinterruptsb-banswer--Powerbfailureb
Softwarebinterruptb
Clockbinterrupt

(2013)bExplainbthebneedbforbinterruptsbtobhavebprioritiesb-banswer--
Tobdecidebbetweenbinterruptsbandbcurrentbtaskb
Tobchoosebwhichbinterruptbifb2boccurb
Tobensurebmostburgentbtaskbisbperformedbfirst.b
Tobensurebmostbefficientbusebofbprocessor

(2013)bDescribebsegmentationb-banswer--
Abwaybofbpartitioningbmemorybsegmentsbthatbarebnotbfixedbsizeb
Segmentsbareblogicalbdivisionsbwhichbcompletebsectionsbthebprogram.

(2013)bStatebthebpurposebofbvirtualbmemoryb-banswer--
Toballowbprogramsbtobrunbwhenbtherebisbinsufficientbmemorybavailable

(2013)bDescribebhowbvirtualbmemorybisbusedb-banswer--
Usebofbbackingbstorebasbifbitbwerebmainbmemoryb
Usesbpages
Pagesbarebmovedbfrombmemorybtobbackingbstorebtobmakebspacebforbpagesbneeded

(2013)bExplainbonebproblembthatbmayboccurbwhilebusingbvirtualbmemoryb-banswer--
Diskbthreshingb
Morebtimebspentbtransferringbpagesbthanbprocessing

(2013)bDescribebthebcodebgenerationbphasebofbtranslation.bYourbanswerbshouldbinclud
ebreferencebtoboptimisationb-banswer--Codebgenerationboccursbafterbsyntaxbanalysis.b
Producesbabmachinebcodebprogrambwhichbisbequivalentbtobthebsourcebprogramb
Variablesbarebgivenbaddressesb
Relativebaddressesbarebcalculatedb

Codeboptimisationbmakesbcodebasbefficientbasbpossibleb
Increasebprocessingbspeedb
Numberbofbinstructionsbisbreduced

, (2013)bDescribebhowbthebcontentsbofbthebmemorybaddressbregisterbandbthebmemorybd
atabregisterbchangebduringbthebfetch-executebcycleb-banswer--
Memorybaddressbregisterb
receivesbaddressbofbinstructionb
Holdsbaddressbofbdatab
Receivesboperandbpartbofbinstructionbfrombthebcurrentbinstructionbregisterb

Memorybdatabregisterb
Receivesbanbinstructionbfrombmemoryblocationbfrombmemorybaddressbregisterb
Receivesbdatabfrombmemoryblocationbinbaddressbpartbofbinstruction

(2013)bComparebco-processorbandbparallelbprocessorbsystemsb-banswer--
Commonbfeaturesb
Morebthanbonebprocessorbworkingbtogetherbtobperformbabsinglebjobb
Jobbisbsplitbintobtasksb
Processorsbarebcontrolledbbybabsingleboperatingbsystemb
Jobbisbcompletedbmorebquicklyb

Differencesb
Parallelbprocessorsbcanbusebanybprocessorbforbtaskb
Co-processorsbperformsbspecificbtypesbofbtaskbonlyb
Parallelbprocessorsbneedbabmorebcomplexboperatingbsystemb
Parallelbprocessorsbarebsynchronised

(2013)bExplainbthebtermbclassb-banswer--
Abtemplatebforbabsetbofbobjectsbthatbhavebstatebandbbehaviourb
Theybhavebmethodsbandbattributesbrepresentedbbybthebrectanglebonbthebdiagram

(2013)bExplainbplainbthebtermbinheritanceb-banswer--
Abderivedbclassbinheritsballbthebattributesbandboperationsbfrombitsbsuperclassbshownbb
ybthebarrowbonbthebdiagram

(2013)bExplainbthebtermbcapsulationb-banswer--Databhidingb
Databcanbonlybbebaccessedbusingboperationsbdefinedbforbthebclassb
Maintainsbdatabintegrity

(2013)bExplainbthebneedbforbregistersb-banswer--
Fastbaccessbtobdatabforbspecificbpurposesbwhenbfrequentbaccessbisbneededb
Registersbarebusedbasbabtemporarybstorage

(2013)bExplainbthebpurposebofbthebaccumulatorbwhenbabprogrambisbbeingbprocessedb-
banswer--Temporarybstoragebinbarithmeticblogicbunitb

Holdsbdatabbeingbprocessedbduringbcalculationsb
Dealsbwithbinputbandboutputbinbthebprocessor

(2013)bExplainbwhybabcompositebkeybisbusedb-banswer--
Itbcreatesbonebtobmanybrelationshipsbasbablinkbtableb
Itbmakesbitb3NF
Reducesbdatabinconsistencies