Prelim Paper 3 - Sec 4 Pure 2021

2021PreliminaryExaminationSecondaryFour Express CANDIDATENAME CLASS INDEXNUMBER PHYSICS 6091/03Paper3Practical 15September2021AdditionalMaterials:NIL 1hour50minutes READTHESEINSTRUCTIONSFIRST Thisdocumentconsistsof 15printedpages,INCLUDINGthecoverpage. [Turnover

Writeyourname,classandindexnumberinthespacesatthetopofthispage.Writeindarkblueorblackpen.Youaretouseasoftpencilforanydiagramsorgraphs.Donotusepaperclips,glue,correctionfluidorcorrectiontape. AnswerallquestionsinthespacesprovidedontheQuestionpaper.Graphpaperis providedin thisQuestionpaper. Additionalsheetsofgraphpapershouldbeusedonlyifitisnecessarytodoso. Youwillbeallowedtoworkwiththeapparatusforamaximumof55minutesforeachsection.Youareexpectedtorecordallyourobservationsassoonastheyaremade.Anaccountofthemethodofcarryingouttheexperimentsisnotrequired. Theuseofanapprovedscientificcalculatorisexpected,whereappropriate.At theendoftheexamination,fastenallyourworksecurelytogether.Thenumberofmarksisgiveninbrackets[ ] attheendofeachquestionorpart question. ForCandidate’suse Shift Laboratory ForExaminer’sUse Total Setter:MrHanJi SectionA(20marks) 1 Inthisexperiment,youwillinvestigateasystemcomprisingoftwospringsandametrerulewithamasssuspendedonit.Thesystemisinequilibrium. Youhavebeenprovidedwith ● twosmallsteelspringslabelledAandBwithloopsofthreadatoneend,● twostands,clampsandbosses,● ametrerule,● a300gmasswithaloopofthread,● ahalf-metrerule,● asetsquare. (a)MeasureandrecordtheunstretchedlengthslA andlB ofthecoiledpartofeachspring,asshowninFig1.1. 2021CCHYPreliminaryExamination Physics(6091)/SecFourExpress Page2of 15

lA orlB Fig1.1 lA =……………,lB =……………[1] (b)SetuptheapparatusasshowninFig1.2. Fig1.2 ● Suspendastringfromeachclamp.● Passthemetrerulethroughtheloopofthreadonthe300gmass.● Suspendthemetreruleandmassfromtheloopsofthreadoneachspring.Theloopsshouldbepositionedatthe10.0cmand90.0cmmarksonthemetrerule,andthemassshouldbesuspendedfromthe60.0cmmark.● Adjusttheseparationoftheclampstoensurethatbothspringsarevertical. (c)Adjusttheheightofeachclamptomakethemetrerulehorizontal. Describehowyoucheckedthatthemetrerulewashorizontal.YoumayindicateonFig1.2ifyouwish. ……………………………………………………………………………………….. 2021CCHYPreliminaryExamination Physics(6091)/SecFourExpress Page3of 15

……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………[1] (d)MeasurethestretchedlengthLA andLB ofthecoiledpartofeachspring,asshowninFig1.2. LA =……………[1] LB =……………[1] (e)Calculatetheextensionand ofeachspring. =……………,=……………[1] (f)Calculate. =……………[1] (g)Plan Forahorizontalmetrerulewithnegligiblemass,thevalueof isrelatedtothedistancexfromspringAtothesuspendedmassbytheequation 2021CCHYPreliminaryExamination Physics(6091)/SecFourExpress Page4of 15

whereDistheconstanthorizontaldistancebetweenthetwosprings,and0<x<D. UsingthesameapparatusasinFig1.2,plananexperimenttoinvestigatethisrelationship. Yourplanshouldinclude ● alistofquantitiesthatremainconstant,● adescriptionofhowyouwouldperformtheexperiment,● astatementofthegraphyouwouldplottotesttherelationship,● asketchofthegraph,● expectedvaluesforthegradientandtheintercept. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. 2021CCHYPreliminaryExamination Physics(6091)/SecFourExpress Page5of 15

……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. 2021CCHYPreliminaryExamination Physics(6091)/SecFourExpress Page6of 15

……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………[4] 2 Inthisexperiment,youwillinvestigatefilamentlampsinseriesandinparallel. Youareprovidedwith ● apowersupply,● aswitch,● threeidenticalfilamentlampseachinaholder,● anammeter,● avoltmeter,● connectingleads, SetupthecircuitasshowninFig2.1. 2021CCHYPreliminaryExamination Physics(6091)/SecFourExpress Page7of 15

Fig2.1 (a)ConnectonefilamentlampbetweenpointsPandQ. Switchonthecircuit. RecordthepotentialdifferenceVandcurrentIinthetableinFig2.2. Switchoffthecircuit. (b)Repeattheprocedurein(a)with: ● twofilamentlampsinseries● twofilamentlampsinparallel betweenPandQ. Switchoffthecircuitwhenyouhavecompletedyourmeasurements. (c)CalculatetheeffectiveresistanceofRforeacharrangement. RecordyouranswersinthetableinFig2.2. V/V I/A R/Ω onelamp twolampsinseries twolampsinparallel 2021CCHYPreliminaryExamination Physics(6091)/SecFourExpress Page8of 15

[4] Fig2.2 (d)Theeffectiveresistanceoflampsinseriesandinparallelaregivenbytherelationship CalculatetheresistanceofeachfilamentlampwiththevaluesofRwhen (i) twolampsareconnectedinseries. resistance=……………[1] (ii)twolampsareconnectedinparallel. resistance=……………[1] (e)SuggestonepossiblereasontoaccountforthedifferencebetweenthevalueofRwhenonelampisconnected(betweenPandQ)and (i) thecalculatedresistanceofonelampin(d)(i), …………………………………………………………………………………... ………………………………………………………………………………..[1] (ii)thecalculatedresistanceofonelampin(d)(ii). …………………………………………………………………………………... …………………………………………………………………………………... 2021CCHYPreliminaryExamination Physics(6091)/SecFourExpress Page9of 15

…………………………………………………………………………………... ………………………………………………………………………………..[2] (f)Explainwhythelampsglowlessbrightlywhentheyareconnectedinseriesascomparedtowhentheyareconnectedinparallel. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………[1] SectionB(20marks) 2021CCHYPreliminaryExamination Physics(6091)/SecFourExpress Page10of 15