Tampines 2022 4N Sci Phy Prelim P2

This document consists of 12 printed pages © TPSS/5105/2022/SEC4PRELIMS 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] (b) Name the process involved in part (a). ……...……...………………………………………………………………………………………. [1] (c) Explain why the radiator is placed at the bottom of the room. ……...……...………………………………………………………………………………………. ……...……...………………………………………………………………………………………. ……...……...………………………………………………………………………………………. [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, amplitude = ………………….. m [1] (b) the number of complete waves between A and B, number of complete waves = ………………………… [1] (c) the wavelength of the water waves. 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. ……...……...………………………………………………………………………………………. ……...……...………………………………………………………………………………………. [1] (b) Calculate the current through the 3.0 kW heater under normal working conditions. current = ………………………… A [1] (c) Dora wishes to connect a 2.0 kW heater in parallel with the 3.0 kW heater, with the same 15 A fuse as shown below. Give a reason, with suitable calculations, why this is not a sensible idea. ……...……...………………………………………………………………………………………. ……...……...………………………………………………………………………………………. [2] P Q R metal casing of heater 3.0 kW heater P Q R metal casing of heater 3.0 kW heater 2.0 kW heater

5 4 The diagram below shows a pendulum swinging freely between positions 1 and 3. (a) State which position, 1, 2 or 3, the pendulum has maximum kinetic energy. ……...……...………………………………………………………………………………………. [1] (b) Zi Yao carries out an experiment to find the total time for 10 complete swings of a pendulum. She repeats the experiment using different lengths of the pendulum. The results are shown in the table below. pendulum length / cm time for 10 swings / s 10.0 6.2 20.0 8.8 30.0 10.8 40.0 12.6 50.0 14.0 (i) On the grid provided in page 6, plot these results, marking each point with a cross (x). [1] 1 2 3

6 (ii) Draw a curved line of best fit for your plotted points [1] (iii) Suggest what Zi Yao can do to improve the accuracy of her experiment. ……...……...………………………………………………………………………………………. [1] length of pendulum / cm time for 10 swings / s 0 10 20 30 40 50 60 70 80 14 13 12 11 10 9 8 7 6 5 4 3 2 1

7 Section B Answer any two questions from this section in the spaces provided. 5 A car of mass 1200 kg is travelling at a uniform speed of 30 m/s for 10 s. The brakes are applied to bring the car to rest. The car decelerates uniformly to rest over 150 m. (a) Describe what is meant by “…speed of 30 m/s”. ……...……...………………………………………………………………………………………. ……...……...………………………………………………………………………………………. [1] (b) Sketch the shape of the speed-time graph in the diagram provided above. (Include all the relevant numerical values) [2] (c) Calculate distance travelled by the car in the first 10 s. distance = ………………….. m [1] speed m/s time / s

8 (d) Determine the time taken for the car to come to a stop. t = ………………….. s [2] (e) Calculate the deceleration experienced by the car. deceleration = ………………….. m/s2 [2]

9 6 A forklift truck carries a 25 000 N load to place it onto a 2.0 m high platform. (a) Calculate the mass of the load. mass = ………………….. kg [2] (b) When lifting the load up the platform, the forklift truck remains stable and does not topple in the clockwise direction. Using the concept of stability, explain why this is so. ……...……...………………………………………………………………………………………. ……...……...………………………………………………………………………………………. ……...……...………………………………………………………………………………………. [2] load 2.0 m platform

10 (c) Calculate the gravitational potential energy of the load when it is lifted to the platform. energy = ………………….. J [2] (d) The load is not placed properly at the platform and fell to the ground. Calculate the speed of the load just before it hits the ground. speed = ………………….. m/s [2]