assumption 2020 4E5N SciPhy Prelim P2

Name: ……………………………………………… ( )Class:…………… ASSUMPTION ENGLISH SCHOOLPRELIMINARY EXAMINATION 2020 SCIENCE (PHYSICS)5076 / 02 ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOLASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOLASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOLASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOLASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOLASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOLASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOLASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOLASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOLASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL LEVEL: Sec 4 Express / 5 Normal(Academic) DATE: 28 August 2020 CLASS: Sec 4/1, 4/2, 4/4 SBB & 5/1DURATION: 1 hour 15 minutes Additional Materials provided: -NIL- INSTRUCTIONS TO CANDIDATESDo not open this booklet until you are told to doso. Write your NAME and INDEX NUMBERat the top of thispage. Thispaper consistsof twosections. SECTION A (45 marks)SHORT-STRUCTURED QUESTIONSAnswerallquestions. Write your answers in the spacesprovided on the question paper. SECTION B (20 marks)FREE-RESPONSE QUESTIONSAnswertwoout of three questions. Write your answersinthe spaces provided on the question paper. For Examiner’s UsePaper 1 /20Paper 2Section A /45Paper 2Section B /20 Paper 3 /15TotalMarks /100 At the end of the examination, hand in this questionbooklet. This Question Paper consists of20printed pages includingthis page.[Turn over

2 SECTION A –SHORT-STRUCTURED QUESTIONS(45 marks)Answerallthe questions in the spaces provided. 1 (a) Here are values of four lengths: 0.1 nm, 10 Mm, 15 km, 0.1 mm Fill in the table below with the values given above. diameter of Earth diameter of an atom diameter of human hair distance between Bukit Panjang andBugis by car [2] (b) A student wants to find out the thickness of a paperfrom a stack of 200 papers. Usinganappropriatemeasuringinstrument,describehowyouwouldmeasureaccuratelythe thickness of a paper. …………………………………………………………………………………….. …………………………………………………………………………………….. ……………………………………………………………………………………..[2] 5076/02/4E5N/PRELIM/20

3 2 Brendainvestigatedthemotionof a carat differenttimesduringitsjourney. Shemeasured the speed of the car every 2.0 s. The tablebelow shows her results. time / s speed / m/s0 02 104 206 308 3010 3012 3014 1716 1018 620 222 0 (a) Onthegridbelow, plottheseresults,markingeachpointwithacross(x).Drawaspeed-time graphtaking into account all your plottedpoints. [2] 5076/02/4E5N/PRELIM/20 [Turn Over

4 (b) Describe the motion of the car throughout the entirejourney. …………………………………………………………………………………….. …………………………………………………………………………………….. ……………………………………………………………………………………..[2] (c) (i) Calculate the initial acceleration of the car fromt = 0 s to 6 s. acceleration = ………………… m/s 2 [2] (ii) Ifthemassofthecaris1500kg,calculatetheresultantforceactingonitduring this time. resultant force = ………………… N[1] 5076/02/4E5N/PRELIM/20

5 3 Thediagramshowsabarrierfoundinmostcarparks.Theweightofthepoleis450Nandthecentreofgravityofthepoleis1.30mawayfromthepivot.Thecentreofgravity of the movable counterweight is 0.30 m awayfrom the pivot. (a) State theprinciple of momentsfor a body in equilibrium. …………………………………………………………………………………….. …………………………………………………………………………………….. ……………………………………………………………………………………..[1] (b) Calculate the minimum forceFto lift up the pole. forceF= ………………… N[2] (c) Suggest how the forceFcan be reduced to lift upthe pole. Explain your answer. …………………………………………………………………………………….. …………………………………………………………………………………….. ……………………………………………………………………………………..[2] 5076/02/4E5N/PRELIM/20 [Turn Over

6 4 Thediagramshowsa rollercoastercartanda track.Thetotalmassofthecartandpassengersis2500kg.ThecartstartsfromrestatpointAreachesBaftersometime.The gravitational field strength on Earth is 10 N/kg. (a) State theprinciple of conservation of energy. …………………………………………………………………………………….. …………………………………………………………………………………….. ……………………………………………………………………………………..[2] (b) The actual speed of the cart is 12 m/s at pointB. Calculate (i) 1. the amount of gravitational potential energyatA, gravitational potential energy = ………………… J[2] 2. the amount of kinetic energy atB. kinetic energy = ………………… J[2] 5076/02/4E5N/PRELIM/20

7 (ii) Commentonthedifferenceinthecalculatedvaluesin(b)(i)eventhoughenergy is conserved. ……………………………………………………………………………… ……………………………………………………………………………… ………………………………………………………………………………[2] 5 Thediagramshowsthefeaturesofthevacuumflaskthatreducethermalenergylossfrom the inside of the flask when hot water is pouredinside. Explain how these features reduce loss of thermalenergy from the hot water by (a) conduction, ………………………………………………………………………. …………………………………………………………………………………….. ……………………………………………………………………………………..[2] (b) convection, ………………………………………………………………………. …………………………………………………………………………………….. ……………………………………………………………………………………..[2] (c) radiation. ………………………………………………………………………… ……………………………………………………………………………………..[1] 5076/02/4E5N/PRELIM/20 [Turn Over

8 6 (a) A sea wave is approaching a beach at a speed of 1.5m/s. (i) The wave takes 2.5 seconds to travel fromPtoQ. Determine 1. the period of the wave, period = ………………… s[1] 2. the frequency of the wave. frequency = ………………… Hz[1] (ii) A beach ball is floating above pointQ. Describe thesubsequentmotion of the ball as thewave passes. ……………………………………………………………………………… ………………………………………………………………………………[1] 5076/02/4E5N/PRELIM/20

9 (b) Some beach-goers are sun tanning under the sun. (i) Statethecomponentintheelectromagneticspectrumthatcausesthemtoget tanned. ………………………………………………………………………………[1] (ii) Suggestwhyit isnotadvisabletobeexposedtothiscomponentin(b)(i)for a long period of time. ……………………………………………………………………………… ………………………………………………………………………………[1] 5076/02/4E5N/PRELIM/20 [Turn Over

10 7 (a) Thediagrambelowshowshowelectricalchargesareusedinspray-paintingofacar door. As the paint droplets leave the nozzle,they are charged positively. State and explain what can be deduced about the cardoor. …………………………………………………………………………………….. …………………………………………………………………………………….. ……………………………………………………………………………………..[2] (b) The diagram shows two isolated positive charges thatare close to each other. (i) Explain what is meant by anelectric field. ……………………………………………………………………………… ………………………………………………………………………………[1] (ii) Onthediagramabove,drawtheelectricfieldpatternbetweenthetwocharges. [1] 8 The figure below shows a circuit in which all theswitchesS1 , S2 andS3 are open. 5076/02/4E5N/PRELIM/20