CCHY Prelim SC PHY 4NA P2 2022 with ms

This document consists of 12 printed pages, INCLUDING the cover page. [Turn over l 2022 Preliminary Examination Secondary Four Normal (Academic) CANDIDATE NAME CLASS INDEX NUMBER SCIENCE (PHYSICS) 5105/02 27 July 2022 Paper 2 Physics Candidates answer on the Question Paper Additional Materials: NIL Paper 1 and 2: 1 hour 15 minutes READ THESE INSTRUCTIONS FIRST Write your name, class and index number in the spaces at the top of this page. Write in dark blue or black pen. You are to use a soft pencil for any diagrams or graphs. Do not use paper clips, highlighters, glue, correction fluid. Answer all questions in Section A and any two questions in Section B. The use of an approved scientific calculator is expected, where appropriate. In calculations, you should show all the steps in your working, giving your answer at each stage. You are advised to spend no longer than 30 minutes on Paper 1. You may proceed to answer Paper 2 as soon as you have completed Paper 1. At the end of the examination, hand in your answers to Paper 1 and Paper 2 separately. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Section A Section B Total Setter: Mr Thong Nai Kee NA CHUNG CHENG HIGH SCHOOL (YISHUN)

2022 Preliminary Examination Science (Physics) (5105) / Sec Four NA Page 2 of 12 Section A ( 14 marks ) Answer ALL questions in this section in the spaces provided. 1 In many countries, people use solar heating to provide hot water for their homes. Fig. 1.1 shows a typical solar heating system. Water is pumped through copper pipes to the roof where they are exposed to the sun. The hot water is then pumped into a storage tank where it heats up water for the home. (a) Name the process by which heat is transferred from the sun to the surface of the pipes. ......……………………………................................................................... [1] (b) The pipes on the roof are painted to increase the rate of heat transfer between the sun and the pipes. Suggest a suitable colour for the pipes. Explain your choice of colour. ……………………………………………………………………………………… …………………………………………………………………………….......... [2] (c) Suggest another way by which the rate of heat transfer from the sun to the pipes can be increased. ………………………………………………………………………………............ ………………………………………………………………............................ [1] Fig. 1.1

2022 Preliminary Examination Science (Physics) (5105) / Sec Four NA Page 3 of 12 (d) Copper pipes are used in the storage tank to increase the rate of heat transfer. Explain why copper is used as the material for the pipes in the storage tank. …………………………………………………………………............................. ………………………………………………………………............................ [1] 2 A lorry and a motorcycle move through a soft ground. Table 2.1 shows t he weight and the total contact area the tyres make with the ground for each vehicle. lorry motorcycle weight/ N 31 000 2 200 total contact area the tyres make with the ground/ m2 3.0 0.18 Table 2.1 (a) Calculate the pressure exerted by the lorry and the motorcycle on the ground. (i) pressure exerted by lorry = …………………………… Pa [1] (ii) pressure exerted by motorcycle = …………………………… Pa [1] (b) State the vehicle that will make the deeper depression on the ground. ……………………………...…………………………………………………… [1]

2022 Preliminary Examination Science (Physics) (5105) / Sec Four NA Page 4 of 12 3 A substance, initially in the solid state, was heated. The temperature was taken at regular intervals. The temperature-time graph was plotted as showin in Fig. 3.1. (a) Using the graph in Fig. 3.1, determine (i) the state(s) of the substance at time t= 4 minutes, ………………………………………………………………………………. [1] (ii) the melting point of the substance. ………………………………………………………………………………. [1] (b) The temperature of the substance did not change betwee n 2 to 7 minutes even though heat was supplied constantly throughout the whole process. Explain this observation. ………………………………………………………………………………………. ………………………………………………………………………………………. …………………………………………………………………………………….[1] 80 60 40 20 1 0 2 3 4 5 6 7 8 9 10 temp/°C time/minutes Fig. 3.1

2022 Preliminary Examination Science (Physics) (5105) / Sec Four NA Page 5 of 12 4 Fig. 4.1 shows a uniform metre rule XY pivoted at its mid-point (50 cm mark). Two masses of weight 25 N and 20 N, are suspended from the beam. The 25 N weight is suspended at the 20 cm mark on metre rule. The 20 N weight is suspended at 80 cm mark on metre rule. Fig. 4.1 (a) Will the end X of the beam move upwards or downwards? Use calculated values to support your answer. End X of the beam moves ……………………….. [2] (b) A downward force of 10 N is now applied on the beam in order to balance it. Write down the position on the metre rule that the downward force should be placed in order to balance it? position on metre rule ……………………………. cm mark [1] ******************* End of Section A *********************** Y 25 N X 20 N 20 cm 80 cm 0 100 50

2022 Preliminary Examination Science (Physics) (5105) / Sec Four NA Page 6 of 12 Section B ( 16 marks ) Answer any TWO questions in the spaces provided. 5 (a) Fig. 5.1 shows an electrical circuit containing a battery of emf 12V, ammeters A1 and A2 and three resistors. (i) Calculate the resistance between X and Y. resistance between X and Y = …………………………… Ω [1] (ii) Calculate the resistance between X and Z. resistance between Yand Z = …………………………… Ω [1] (iii)If the battery has negligible internal resistance, what will be the readings of the voltmeter V and ammeters A1 and A2? reading of voltmeter V= …………………………… V [1] reading of ammeter A1= …………………………… A [1] reading of ammeter A2= …………………………… A [1] Fig. 5.1

2022 Preliminary Examination Science (Physics) (5105) / Sec Four NA Page 7 of 12 (b) Fig. 5.2 shows the three wires of an electrical mains supply connected to a water heater. The live wire carries a current of 4 A. (i) If the water heater is operating properly, state the size of currents in the neutral and earth wires? current in neutral wire = …………………………… A and current in earth wire = …………………………… A [1] (ii) Describe the electrical fault which the earth wire is protecting against. ………………………………………………………………………………………. …………………………………………………………………………………….[1] (iii)Hence describe how the earth wire work s to protect against the electrical fault in your answer to (ii). ………………………………………………………………………………………. …………………………………………………………………………………….[1] Fig. 5.2 water heater mains supply 4A

2022 Preliminary Examination Science (Physics) (5105) / Sec Four NA Page 8 of 12 6 (a) Fig. 6.1 shows the speed-time graph of a bus travelling from town A to B and then to C. Total total journey takes 50 minutes (3000 seconds). (a) Describe the motion of the bus along section BC (1000 to 3000 s). ………………………………………………………………………………………. …………………………………………………………………………………….[1] (b) At C, the bus starts to decelerate uniformly to a stop in 600 s. On Fig. 6.1, plot the graph for the last 600 s of the journey. [1] (c) Calculate the total distance travelled by the bus in 3600 s. total distance travelled ……………………….m [2] Fig. 6.1

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