ABCDEF1ItemsCostPriceSellingPriceProfitperÿItemItemssoldTotalProfit2Itemÿ1305350453214403Itemÿ210012020459004Itemÿ320022020326405Itemÿ410713023892047
3.23COMPUTERÿSTUDIESÿ(451)
3.23.1ÿÿComputerÿStudiesÿPaperÿ1ÿ(451/1)
SECTIONÿAÿ(40ÿmarks)
Answerÿallÿtheÿquestionsÿinÿthisÿsectionÿinÿtheÿspacesÿprovided.
1Writeÿeachÿofÿtheÿfollowingÿacronymsÿinÿfullÿasÿusedÿinÿcomputing.(2ÿmarks)
(a)CAD
(b)DVD
(c)WORM
(d)POS
2Aÿschoolÿkeepsÿstudentÿrecordsÿinÿaÿdatabase.ÿTheÿdataÿisÿcodedÿbeforeÿentry.
Stateÿthreeÿreasonsÿwhyÿtheÿcodingÿisÿnecessary.(3ÿmarks)
3DifferentiateÿbetweenÿBccÿandÿccÿinÿanÿemail.(2ÿmarks)
4Stateÿthreeÿrisksÿposedÿbyÿimproperÿcablingÿinÿaÿcomputerÿlaboratory.(3ÿmarks)
5Listÿtwoÿcareerÿopportunitiesÿdirectlyÿassociatedÿwithÿcomputerÿnetworking.(2ÿmarks)
6Aÿretailerÿusesÿaÿspreadsheetÿprogramÿtoÿcalculateÿprofits.ÿFigureÿ1ÿshowsÿtheÿspreadsheet.
Figureÿ1
(a)Whichÿrowÿcontainsÿlabelsÿonly?(1ÿmark)
(b)WriteÿtheÿformulaÿthatÿhasÿbeenÿenteredÿinÿcellÿF2.(2ÿmarks)
7Stateÿthreeÿreasonsÿwhyÿanÿorganisationÿmayÿoptÿtoÿdevelopÿitsÿownÿsoftwareÿin-houseÿrather
thanÿbuyÿoff-the-shelfÿsoftware.(3ÿmarks)
209
9Anÿorganisationÿintendsÿtoÿreplaceÿanÿexistingÿsystemÿbyÿcarryingÿoutÿtheÿprocessÿin11Theÿ21stÿcenturyÿhasÿhadÿmanyÿformsÿofÿICTÿtechnologiesÿimprovingÿtheÿvariousÿmeansÿof12ExplainÿwhyÿaÿDTPÿapplicationÿwouldÿbeÿpreferredÿtoÿaÿwordÿprocessingÿapplicationÿwhen
8Theÿtopologyÿbelowÿisÿformedÿbyÿcombiningÿtwoÿtypesÿofÿtopologies.
Figureÿ2
(a)Giveÿoneÿnameÿforÿtheÿcombinedÿtopologyÿinÿfigureÿ2.(1ÿmark)
(b)Nameÿtheÿtwoÿtopologiesÿformingÿtheÿcombinedÿtopologyÿinÿfigureÿ2.(2ÿmarks)
stages.
(a)Nameÿthisÿimplementationÿstrategy.(1ÿmark)
(b)Giveÿtwoÿreasonsÿwhyÿtheÿorganisationÿisÿoptingÿtoÿuseÿtheÿimplementationÿstrategyÿin
(a)ÿabove.(2ÿmarks)
10(a)Explainÿtheÿimportanceÿofÿdiskÿpartitioning.(2ÿmarks)
(b)Differentiateÿbetweenÿpull-downÿmenuÿandÿpop-upÿmenuÿasÿusedÿinÿGraphicalÿUser
Interfaceÿ(GUI)ÿoperatingÿsystems.(2ÿmarks)
communication.ÿHowever,ÿtheseÿchangesÿhaveÿbroughtÿmanyÿchallenges.
Stateÿthreeÿnegativeÿsocialÿimpactsÿofÿtheseÿtechnologies.(3ÿmarks)
designingÿaÿpublication.
(2ÿmarks)
13Aÿcomputerÿisÿidleÿbutÿtheÿhardÿdiskÿlightÿisÿblinking,ÿindicatingÿsomeÿactivity.
Stateÿtwoÿpossibleÿcausesÿofÿthis.(2ÿmarks)
14Describeÿcompatibilityÿasÿaÿfactorÿtoÿconsiderÿwhenÿpurchasingÿaÿcomputer.(2ÿmarks)
15Identifyÿtheÿappropriateÿoutputÿdeviceÿforÿtheÿproductionÿofÿeachÿofÿtheÿfollowing:
(a)receiptsÿwhereÿcarbonÿcopiesÿareÿrequired;(1ÿmark)
210
(b)anÿarchitecturalÿdrawingÿwhereÿprecisionÿisÿrequired;(1ÿmark)
(c)outputÿwhereÿtheÿuserÿisÿvisuallyÿimpaired.(1ÿmark)
SECTIONÿBÿ(60ÿmarks)
Answerÿquestionÿ16ÿandÿanyÿotherÿTHREEÿquestionsÿfromÿthisÿsectionÿinÿtheÿspacesÿprovided.
16(a)Figureÿ3ÿshowsÿaÿflowchart.ÿÿUseÿitÿtoÿanswerÿtheÿquestionsÿthatÿfollow.
(i)Determineÿtheÿoutputÿfromÿtheÿflowchartÿif:
I.Xÿ=ÿ5;(2ÿmarks)
II.Xÿ=ÿ7.(2ÿmarks)
(ii)WriteÿaÿPseudocodeÿforÿtheÿflowchartÿinÿfigureÿ3.(5ÿmarks)
(iii)Modifyÿtheÿflowchartÿsoÿthatÿitÿcanÿbeÿusedÿtoÿgetÿtheÿsumÿofÿintegersÿbetween
50ÿandÿ100.(4ÿmarks)
(b)Listÿtwoÿprogrammingÿlanguageÿtranslators.(2ÿmarks)
211
CALL0622405405Ksh48,000018Figureÿ4ÿshowsÿanÿadvertÿplacedÿinÿaÿnewspaper.ÿUseÿitÿtoÿanswerÿtheÿquestionsÿthat follows
17(a)Describeÿthreeÿtypesÿofÿvalidationÿchecksÿasÿusedÿinÿdataÿprocessing.(6ÿmarks)
(b)Aÿcompanyÿhasÿoptedÿtoÿstoreÿitsÿemployees?ÿpersonalÿdetailsÿinÿaÿcomputerÿsystem.
theseÿdetails.(4ÿmarks)
(c)(i)Describeÿeachÿofÿtheÿfollowingÿdataÿprocessingÿmodes:
I.real-time;(2ÿmarks)
II.interactive.(2ÿmarks)
ii)Stateÿanÿapplicationÿareaÿwhereÿreal-timeÿdataÿprocessingÿmodeÿisÿapplied.(1ÿmark)
NEWÿARRIVALSÿ-ÿLAPÿTOPÿCOMPUTERHDDWindowsÿ8300ÿGBHomeÿEditionRAMFreeÿSuite512ÿMBúÿWordÿprocessorClockÿSpeedúÿÿSpreadsheet2.3ÿGHzÿxÿ2úÿÿDTPOpticalÿDriveúÿÿPresentationDVDúÿÿInternetÿbrowserScreenúÿÿEmail17ÿinchesKeyboard,ÿMouse,ÿModemParallelÿportÿUSB,ÿserialOTHERÿPCsÿAVAILABLE
(a)(i)Defineÿaÿlaptopÿcomputer.(1ÿmark)
(ii)Theÿscreenÿisÿsaidÿtoÿbeÿ17ÿinches.ÿExplainÿwhatÿthisÿmeans.(2ÿmarks)
(b)Stateÿoneÿadvantageÿofÿhavingÿeachÿofÿtheÿfollowingÿprovidedÿwithÿaÿlaptop.(3mks)
(i)modemÿ
(ii)USBÿ
(iii)freeÿsuiteÿ
c)Stateÿtheÿsoftwareÿpackageÿinÿtheÿfreeÿsuiteÿwhichÿisÿmostÿsuitableÿforÿeachÿofÿthe (4mks)
following:
(i)computingÿbudgetsÿ
(ii)creatingÿdocumentsÿ
(iii)designingÿofÿbrochures
(iv)recordsÿmanagement
(d)(i)Stateÿthreeÿadvantagesÿofÿusingÿaÿcomputerÿtoÿdesignÿanÿadvertÿsuchÿasÿtheÿone above(3ÿmarks)
(ii)Stateÿtwoÿbenefitsÿofÿhavingÿtheÿadvertÿuploadedÿonÿtheÿinternet.(2ÿmarks)
19Aÿworkerÿisÿunableÿtoÿtravelÿtoÿtheÿofficeÿbutÿmayÿstillÿbeÿableÿtoÿdoÿtheÿofficeÿworkÿthrough
telecommuting.
(a)Explainÿwhyÿtheÿworkerÿmayÿuseÿeachÿofÿtheÿfollowing:
(i)email;(2ÿmarks)
(ii)fax;(2ÿmarks)
(iii)digitalÿcamera;(2ÿmarks)
(iv)firewall.(2ÿmarks)
(b)Theÿworkerÿneedsÿtoÿmakeÿregularÿbackupsÿofÿdocumentsÿsentÿtoÿtheÿoffice.
Stateÿthreeÿreasonsÿforÿthis.(3ÿmarks)
(c)Explainÿtwoÿbenefitsÿthatÿtheÿemployerÿwillÿgetÿbyÿallowingÿthisÿworkerÿtoÿdoÿthe
officeÿworkÿthroughÿtelecommuting.(4ÿmarks)
20(a)(i)Differentiateÿbetweenÿone?sÿcomplementÿandÿtwo?sÿcomplementÿinÿdata
representation.(2ÿmarks)
(ii)Explainÿtheÿpreferenceÿofÿbinaryÿnumberÿsystemsÿoverÿdecimalÿnumberÿsystems
inÿcomputers.(2ÿmarks)
(b)(i)Usingÿone?sÿcomplement,ÿsubtractÿ1000112ÿfromÿ0100102.(4ÿmarks)
(ii)Convertÿtheÿnumberÿ21.0312510ÿtoÿitsÿbinaryÿequivalent.(5ÿmarks)
(c)Performÿtheÿfollowingÿbinaryÿoperations.
1101ÿ+ÿ11011ÿ+ÿ101&nbs…
