YCSS 2022 4NA Sci(Phy) Prelim P2

1 YUAN CHING SECONDARY SCHOOL Secondary Four Normal (Academic) Course Preliminary Examination 2022 CANDIDATE NAME CLASS INDEX NUMBER SCIENCE Paper 2 Physics Candidates answer on the Question Paper. No Additional Materials are required. 5105/02 12 Aug 2022 Papers 1 and 2: 1 hour 15 minutes READ THESE INSTRUCTIONS FIRST Write your name, class and index number on all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use a pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions in Section A 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 /14 Section B /16 Total /30 This paper consists of 9 printed pages.

2 milk heating element water sidewall Section A (14 marks) Answer all the questions in the spaces provided. 1 Complete the table below to show the physical quantity and its SI unit, in words, measured by each of the apparatus. apparatus physical quantity measured SI unit stopwatch time electronic balance kilogram ammeter [2] 2 The diagram below shows a milk warmer heating up frozen milk to the desired temperature. A heating element is used to raise the temperature of the water to 40 °C. (a) State the main process by which thermal energy is being transferred (i) from the heating element to the milk bottle, …………………………………………………………………………………………………… [1] (ii) throughout the milk. ………………………………………………………………………………………………....... [1] (b) The material used to make the sidewall is often plastic. Explain why the use of plastic makes it safer for someone who uses this type of milk warmer. ……………………………………………………………………………………………………….. ……………………………………………………………………………………………………….. [1]

3 3 A submarine fires a test missile underwater . The speed of the missile is tracked and recorded every two seconds for ten seconds as it travels in the water. The table below shows the speed of the missile every two seconds of travel. time / s speed / m/s 0 0 2 20 4 60 6 140 8 240 10 340 (a) On the grid below, p lot a graph of these results. Draw a best-fit curve taking into account all the plotted points. [2] (b) Using the plotted graph, estimate the time when the speed of the mi