Tampines 2022 4N Sci Phy Prelim P2 (ans)

This document consists of 10 printed pages © TPSS/5105/2022/SEC4MYE TAMPINES SECONDARY SCHOOL Secondary Four Normal Academic PRELIMINARY EXAMINATION 2022 NAME CLASS REGISTER NUMBER SCIENCE (Physics) 5105/02 PAPER 2 01 August 2022 Paper 1 and 2: 1 hour 15 minutes Candidates answer on the Question Paper No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, index number and class on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. Answer all questions in Section A and any two questions in Section B. The use of an approved 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 marks) SECTION B (16 marks) TOTAL (30 marks) [Turn over NA

2 Section A Answer all questions in the space provided. 1 The diagram below shows part of a hotel room. The radiator is heating the room. (a) Draw arrow(s) on the diagram above to show the movement of the warm air around the room. [1] • ANS: Mark given as long as the arrow is upwards (b) Name the process involved in part (a). • Convection current [1] ……...……...………………………………………………………………………………………. [1] (c) Explain why the radiator is placed at the bottom of the room. • Hot air from the radiator rises as it is less dense [1] (Do not accept ‘hot air rises and cold air sinks’ if student do not mention density or less dense.) ……...……...………………………………………………………………………………………. ……...……...………………………………………………………………………………………. [1]

3 2 The diagram below shows a side view of the water waves produced in a swimming pool by a wave machine. Use the information given in the diagram to determine: (a) the amplitude of the waves, Crest to trough: 1.7 – 1.3 = 0.4 m Amplitude = 0.4/2 = 0.20 m [1] amplitude = ………………….. m [1] (b) the number of complete waves between A and B, • 4 waves number of complete waves = ………………………… [1] (c) the wavelength of the water waves. wavelength = 10 / 4 waves = 2.5 m [1] wavelength = ………………………… m [1] 10 m A B 1.7 m 1.3 m bottom of pool

4 3 The live wire of a 240 V mains supply is protected by a 15 A fuse. A 3.0 kW heater is connected to the supply. The arrangement is shown in diagram below. (a) Identify wire R and state its colour of the insulation of the wire. • Eart