4E Phy Prelim 2021 P1

BOONLAYSECONDARYSCHOOL PRELIMINARYEXAMINATION 2021 Name ( ) Class Subject : PHYSICSPaperNo : 1SubjectCode : 6091/01Level : SECONDARYFOUREXPRESSDate/Day : 13SEPTEMBER/ MONDAYTime : 1145- 1245Duration : 1HOUR READTHESEINSTRUCTIONSFIRST Donot openuntil youaretoldtodoso. Writeinsoftpencil.Donotusestaples,paperclips,glueorcorrectionfluid.WriteyournameandindexnumberontheAnswerSheetinthespacesprovided. INFORMATIONTOCANDIDATES Therearefortyquestionsonthispaper.Answer allquestions.ForeachquestiontherearefourpossibleanswersA, B, CandD.Choosethe oneyouconsider correct andrecordyour choicein soft pencil ontheseparateAnswerSheet. Eachcorrectanswerwillscoreonemark.Amarkwillnotbedeductedforawronganswer.Anyroughworkingshouldbedoneinthispaper.Theuseofanapprovedscientificcalculatorisexpected,whereappropriate. Thisquestionpaperconsistsof13printedpages.

2 SectionA[40marks]Answer allquestions. Foreachquestion,therearefourpossibleanswersA, B, CandD.Choosetheoneyouconsidercorrectandrecordyourchoiceinsoft pencilontheseparateAnswerSheet. 1 Apendulumissetinmotionand25completeoscillationsaretimed.Thetimemeasuredis75s. WhatistheperiodofthependulumandthetimetakenforthependulumtoswingfromXtoY? period/s time/sA 0.17 0.33B 0.33 0.17C 1.5 3.0D 3.0 1.5 2 Acyclist,ridingataspeedof5.0m/s,brakeswithuniformdecelerationandstopsin3.0m.Howlongdoesthecyclisttaketostop? A 0.30s B 0.60s C 0.83s D 1.2s 3 Aliftmovesdownwardsataconstantaccelerationof2m/s 2 .Giventhatthelifthasamassof500kg,whatisthetensioninthecable?(Takeg=10N/kg) A 2500N B 4000N C 5000N D 6000N BLS/Prelim/2021/4E/Physics/6091/01

3 4 Whichgraphbelowshowscorrectlyhowthecar’sdisplacementwillchangewithtimewiththegivenvelocity–timegraph? A C B D 5 ThefigureshowsforceF1 andF2 exertedonawoodenblockplacedonaconcretesurface.Anotherforcewhichisthefrictionbetweentheblockandtheconcretesurfaceis3.0N. Which pair of forces for F1 and F2 causes the wooden block to move with anacceleration? F1 /N F2 /NA 3.0 6.0B 5.0 8.0C 6.0 10D 8.0 11 BLS/Prelim/2021/4E/Physics/6091/01

4 6 Ahollowrectangularblockhasthedimensionsshown. Theholeinthemiddlegoesallthewaythroughtheblock.Thedensityofthemetalis15g/cm 3 .Whatisthemassoftheblock? A 900g B 2100g C 3000g D 3600g 7 AuniformbeamXYisbalancedonapivotwithtwoweights,W1 andW2 hungatequaldistancesfromthepivot. ItisobservedthattheendYmovesdownwardwhenW1 isremoved.Whereshouldthepivotbeinordertobalancethebeamagain? 8 AnL-shapedrigidleverarmispivotedatpointZ.Threeforcesactontheleverarm,asshowninthediagram. WhatisthemagnitudeoftheresultantmomentoftheseforcesaboutpointZ? A 20Nm B 30Nm C 40Nm D 70Nm BLS/Prelim/2021/4E/Physics/6091/01

5 9 A5.0cmmercurycolumnissuspendedalongaglasstubeasshowninFig.9.1.Giventhatthelengthofthetrappedairis8.0cmandtheatmosphericpressureis75cmHg,what isthelengthof thetrappedairwhentheglasstubeisinvertedtothepositionshowninFig.9.2. A 7.0cm B 8.1cm C 9.1cm D 10.3cm 10 ThediagramshowsamanometerusedtodeterminethedensityofliquidM.WhenliquidMispouredintoonearm,thewaterlevelintheotherarmrises.If