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MARKSCHEMEfortheMay/June20139702Paper3(AdvancedPracticalSkills1),umrawmark40Thismarkschemeispublishedasanaidtoteachersandcandidates,toindicatetherequirementsoftheexamination.ItshowsthebasisonwhichExaminerswereinstructedtoawardmarks.ItdoesnotindicatethedetailsofthediscussionsthattookceatanExaminers’meetingbeforemarkingbegan,whichwouldhaveconsideredtheacceptabilityofalternativeanswers.MarkschemesshouldbereadinconjunctionwiththequestionpaperandthePr ipalExaminerReportforTeachers.CambridgeispublishingthemarkschemesfortheMay/June2013seriesformostIGCSE,GCEAdvancedLevelandAdvancedSubsidiaryLevelcomponentsandsomeOrdinaryLevelcomponents.(a)( ValueofTinrange0.4≤T≤1.4 Evidenceof Sixsetsofreadingsofmandt(orT)scores5marks,foursetsscores4marksetc. HelpfromSupervisor–1.Rangeofm:∆m≥0.600 Column EachcolumnheadingmustcontainatyandaThepresentationof tyandunitmustconformtoacceptedscientificconventione.g.1/T2/s2. Donotallow1/T Allvaluesofrawtmustallbegiventothenearest0.1sor0.012 2Significantfiguresforeveryrowofvaluesof1/Tsameasoronegreatert(orT)asrecordedinCalculation:

Valuesof1/Tcalculated Sensiblescalesmustbeused,noawkwardscales(e.g.Scalesmustbechosensothattheplottedpointsoccupyatleasthalfthegraphgridinbothxandydirections.Scalesmustbelabelledwiththetythatisbeingplotted.Scalemarkingsshouldbenomorethanthreelargesquaresapart.Plottingof AllobservationsinthetablemustbeDiameterofpointsmustbe≤halfasmallsquare(no“blobs”).Worktoanaccuracyofhalfasmallsquare. Allpointsinthetablemustbeplotted(atleast5)forthismarktobeawarded.Scatterofpointsmustbelessthan0.1s2of1/T2fromastraightline.()Lineofbest Judgebybalanceofallpointsonthegridaboutthecandidate’sline(atleast5points)Theremustbeanevendistributionofpointseithersideofthelinealongthefulllength.Allowoneanomalouspointonlyifclearlyindicated(i.e.circledorlabelled)bythecandidate.Linemustnotbekinkedorthickerthanhalfasmallsquare.( Thehypotenuseofthetrianglemustbeatleasthalfthelengthofthedrawnline.Bothread-offsmustbeaccuratetohalfasmallsquareinboththexandydirections. Correct-readofffromapointonthelineandsubstitutedintoy=mx+c.Read-offmustbeaccuratetohalfasmallsquareinbothxandydirections.Correctread-offoftheinterceptdirectlyfromtheValueofP=candidate’sgradient.ValueofQ=candidate’sintercept. UnitforP(kg1s2)correctandconsistentwithvalueandQ(s2) [Total:20](a)(i)ValueofLinrange8.0≤L≤12.0cmwithconsistentunittothenearestmm. ()Absoluteuncertainty1≤∆L≤3mm.Ifrepeatedreadingshavebeentaken,thentheuncertaintycanbehalftheCorrectmethodofcalculationtogetpercentage (i)ValueofrawN1an (i)ValueofN2≥ EvidenceofrepeatsforN1orN2eitherhereorin(b)( Correctcalculationof Secondvalueof SecondvaluesofN2and Second(average)valueofN1>first(average)valueof Twovaluesofkcalculated ()Justificationofs.f.inklinkedtosignificantfiguresinLand(N1–N2)andm. (i) Sensiblecommentrelatingtothecalculatedvaluesofk,testingacriterionspecifiedbythe ​ Limitations4()Improvements4DonotAtworeadingsnotenough(todrawaconclusion)takemorereadingsandplotagraph/calculatemorekvaluesandreadings/onlyonereadingsandaveragekBmethodofreducingfrictionofpulleywithlocationCwetstringaddedto/massofstringnotaccountedDcanonlymeasuretonearest0.4g/paperclipusesmallermassese.g.halfpaperclips,riders,graphpaperEchangeinNareveryreasonedexnationforchanginglengthofwireFcopperwireisnotwaterlevelcircularwirechange[Total:201356GCEGCE97029702/353（1）20135/6IGCSE、GCE2GCEAS/ALEVEL20135/697021(a)T0.4T1.4s[1]b)mt（T）54[5]–1m.m0.600kg1/T2/秒–2[1]1/T2c)(i)[1]（3:10）xy[1]（无“斑点1]（5）0.1s–2of1/T2i)1]（至少5）)[1]xy3GCEAS/ALEVEL20135/69702y[1]ymxcxyd)PQ[1]P(kg–1s–2)的单位正确且与值和Q(s–2)[1]一致2(a)(i)L8.0L12.0cm1.L3mm。如果重复读数，那么不确定性可能是范围的一半。正确的计算方法以获得百分比不确定