2021 FCS 4E Physics Prelim P2

FUCHUNSECONDARYSCHOOLPRELIMINARYEXAMINATION2021SECONDARY4EXPRESS Candidatename Centrenumber S Indexnumber Class: PHYSICSPaper2Theory 6091/02 31August 20211hour 45minutesCandidatesanswerontheQuestionPaper. NoAdditionalMaterialsarerequired. READTHESEINSTRUCTIONSFIRST Writeyourname,centrenumber,classandindexnumberonthisQuestionPaper.Writeindarkblueorblackpen.YoumayuseanHBpencilforanydiagramsorgraphs.Donotusestaples,paperclips,glueorcorrectionfluid. SectionAAnswer allquestions. SectionBAnswer allquestions. Question11hasachoiceofpartstoanswer. Candidatesareremindedthat allquantitativeanswersshouldincludeappropriateunits.Theuseofanapprovedscientificcalculatorisexpected,whereappropriate.Candidatesareadvisedtoshowalltheirworkinginaclearandorderlymanner,asmoremarksareawardedforsounduseinPhysicsthanforcorrectanswers. Thenumberofmarksisgiveninbrackets[ ]attheendofeachquestionorpartquestion. For Examiner’sUseSectionASectionB Total /80

Nameofsetter:MdmRohizanTalib Thisdocumentconsistsof 18pagesand0blankpage. SectionA[50marks] Answer allthequestionsinthissection. 1 Fig.1.1showsalargemetalwasher. Thewasheris0.15cmthinkandtheinternalandexternaldiameterareshownonFig.1.1. Fig. 1.1(nottoscale) (a) Astudentusesarulertomeasuretheinternaldiameterofthewasher. (i) Describeonepracticalproblemintakingthismeasurement. ……………………………………………………………………………………………. …………………………………………………………………………………………[1] (ii) State the name of a measuring instrument that is used to take thismeasurementmoreaccurately. …………………………………………………………………………………………[1] (b) Themassofthemetalwasheris5.4g. (i) Calculatethevolumeofmetalinthewasher. volume=……………………………….[2] (ii) Calculatethedensityofthemetal. 2

density=……………………………….[2] 2 Fig. 2.1showsavelocity-timegraphforacarinitiallytravellingforwardinahorizontalstraightline. Fig. 2.1 (a) Describethemotionofthecar (i) betweenAandB, ……………………………………………………………………………………………. …………………………………………………………………………………………[1] (ii) betweenBandC, ……………………………………………………………………………………………. ………………………………………………………………………………………....[1] (iii) betweenEandF. ……………………………………………………………………………………………. …………………………………………………………………………………………[1] (b) Thecartravels133mwhenitreachespointC. Calculatehowfaristhecarfromthestartingpointattheendof50s. 3

distancefromstartingpoint=…………………………………….[2] 3 Fig.3.1showsahelicopterstationaryintheair. Verticalliftforcesareproducedbythefrontrotorandbythebackrotor. Fig. 3.1(nottoscale) Theweightofthehelicopteris150kN. HorizontaldistancesaremarkedonFig.3.1. (a) (i) Statewhatismeantbycentreof gravity. ……………………………………………………………………………………………. …………………………………………………………………………………………[1] (ii) Describethedifferencebetweenmassandweight. ……………………………………………………………………………………………. …………………………………………………………………………………………[1] 4

(iii) Determinethemassofthehelicopter. Thegravitationalfieldstrengthgis10N/kg. mass=………………………………….[1] 5

(b) (i) BytakingmomentsaboutpointX,calculatetheliftforcefromthefrontrotor. liftforce=……………………………………[2] (ii) Calculatetheliftforcefromthebackrotor. liftforce=……………………………………[1] (c) Thehelicopterpilotadjuststheliftforcesatthefrontandbackofthehelicopter. Thefrontofthehelicoptertiltsdown,whilstthecentreofgravityofthehelicopterstaysatthesameheight Statehowtheliftforcesfromtherotorsareadjustedtoachievethiseffect. ……………………………………………………………………………………………......... ……………………………………………………………………………………………......... ……………………………………………………………………………………………......... ………………………………………………………………………………………….........[2] 6

4 Fig.4.1showsthepathofametalballfiredintotheairatanangletothehorizontal. Fig. 4.1(nottoscale) (a) Describeandexplaintheenergypossessedbytheball at point Aandpoint B,assumingairresistancehasanegligibleeffectonthemotionoftheball. ……………………………………………………………………………………………......... ……………………………………………………………………………………………......... ……………………………………………………………………………………………......... ………………………………………………………………………………………….........[2] (b) Themetalballhasamassof1.6kg. ThespeedoftheballatAis20m/s. (i) CalculatethekineticenergyoftheballatA. kineticenergy=…………………………………………[2] (ii) ThekineticenergyoftheballatBis180J. Calculate 1. thegainingravitationalpotentialenergyoftheballasitmovesfromAtoB, gainingravitationalpotentialenergy=………………………………[1] 2. thechangeinverticalheight hoftheballasitrisesfromAtoB.Thegravitationalfieldstrengthg=10N/kg. h=……………………………………………[2]7

5 Fig.5.1showsarefrigeratorwithafreezingcompartmentatthetop. Fig. 5.1 (a) Whenwaterisplacedinice-cubetrayinthefreezingcompartment,itturnsintoiceatthefreezingpoint. (i) Describethearrangementofwatermolecules.……………………………………………………………………………………………. …………………………………………………………………………………………[1] (ii) Describe and explain, using ideas about molecules, what happenstotheenergyofwaterasitturnsintoiceatthemeltingpoint.……………………………………………………………………………………………. …………………………………………………………………………………………[1] (b) Anice-cubetrayisfilledwith400gofwaterat20 0 C. Itisplacedinthefreezingcompartmentoftherefrigeratorandallthewaterbecomesiceat0 0 C. Thespecificheatcapacityofwateris4.2J/(g 0 C)andthespecificlatentheatoffusionofwateris330J/g. Calculatethetotalenergythatisremovedfromthewater. energy=…………………………………………..[3] (c) Explainwhyplacingthefreezingcompartmentatthetopcoolsalloftheairintherefrigerator. ……………………………………………………………………………………………......... ……………………………………………………………………………………………......... ……………………………………………………………………………………………......... ………………………………………………………………………………………….........[2] 8

6 Soundwavesisalongitudinalwaves. (a) Statewhatismeantbylongitudinal waves. ……………………………………………………………………………………………......... ………………………………………………………………………………………….........[1] (b) Astudentmeasuresthespeedofsoundinairusinganechofromacliff. Shestandsfacingthecliffandclaptwowoodenblocks,asshowninFig.6.1. Fig. 6.1 Theechoarrives3.8saftersheclapstheblocks. Shewalks150mtowardsthecliffandthenclapstheblocksagain. Theechonowarrives2.9saftersheclaps. Calculatethespeedof soundinair usingthesedata. Giveyouranswertoanappropriatenumberofsignificantfigures. speed=………………………………………[3] (c) Thestudentproducesapercussionsoundusingotherblocksofwood. Statehowthesoundheardchangeswhen (i) theamplitudeofthesoundincreases, …………………………………………………………………………………………[1] (ii) thewavelengthofthesounddecreases. …………………………………………………………………………………………[1] 9

7 Whenanegatively-chargedmetalspherewithaninsulatedhandleisbroughtneartoan uncharged metal plate as shown in Fig. 7.1, the sensitive centre-zerogalvanometershowsamomentarydeflectiontotheright. Fig. 7.1 (a) Explainwhatcausesthemomentarydeflectionofthegalvanometer. ……………………………………………………………………………………………......... ……………………………………………………………………………………………......... ……………………………………………………………………………………………......... ………………………………………………………………………………………….........[2] (b) OnFig.7.1,drawthedistributionofthechargesinducedonthemetalplateafterthemomentarydeflectioninthegalvanometer. [1] (c) Thechargeononeelectronis1.6x10 -19 C. Calculatethenumberofelectronspassingthroughgalvanometerifthegalvanometerrecordsamomentarydeflectionof0.25Ain0.2seconds. numberofelectrons=……………………………………..[2] 10