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. ………………………………………………………………….......