MFSS Prelim P2

[Turn over Name Reg. No Class MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL MAYFLOWER SECONDARY SCHOOL 4EX PHYSICS 6091/02 Paper 2 Theory [80 Marks] PRELIMINARY EXAMINATION Candidates answer on the Question Paper. No Additional Materials are required. August 2024 1 hour 45 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. FOR EXAMINER’S USE Paper Marks Paper 1 (MCQ) / 40 Paper 2 / 80 A / 70 B Q ___ / 10 Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Section A Answer all questions. Write your answers in the spaces provided. Section B Answer one questions. Write your answers in the spaces provided. Candidates are reminded that all quantitative answers should include appropriate units. The use of an approved scientific calculator is expected, where appropriate. Candidates are advised to show all their working in a clear and orderly manner, as more marks are awarded for sound use of Physics than for correct answers. Unless otherwise stated, take the gravitational field strength on earth g to be 10 N/kg. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. This question paper consists of 20 printed pages. Setter: Mr Johnson Tay Vetter: Mrs Neo Peck Hoon

2 Section A Answer all the questions in this section. 1 A skydiver of mass 76 kg is falling vertically in still air. At time t = 0 s, the skydiver opens his parachute. Fig. 1.1 is the speed–time graph for the skydiver from t = 0 s. Fig. 1.1 (a) Using Fig. 1.1, determine: (i) the deceleration of the skydiver immediately after the parachute opens. deceleration = …………………….…………. [2] (ii) the force due to air resistance acting on the skydiver immediately after the parachute opens. force = …………………….…………. [3]

3 [Turn over (b) Explain, in terms of the forces acting on the skydiver, his motion between t = 0 s and t = 6.0 s. …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… [3] 2 Pluto is a dwarf planet. Fig. 2.1 shows the direction of motion of Pluto as it follows its elliptical orbit around the Sun. Fig. 2.1 (a) Point X is the point in the orbit closest to the Sun and point Y is the point furthest away. The orbital speed of Pluto varies as it orbits the Sun. (i) Using ideas of gravitational field strength, explain and describe how the speed of Pluto varies as it moves from X to Y and then back to X. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… [2] (ii) Using principle of conservation of energy and energy transfer, explain why the speed of Pluto varies in this way. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… [2]

4 (b) Pluto has a white surface, as shown in Fig. 2.2. As Pluto rotates, the white surface alternately faces towards and away from the Sun. Fig. 2.2 Explain how this affects the temperature of Pluto as it rotates on its own axis. …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… [2] 3 Fig. 3.1 shows a person moving across an ice-covered pond to reach a ball on the ice. Fig. 3.1 (a) Using concept of pressure, explain why this way of moving across the ice is safer than walking. …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… [3]

5 [Turn over (b) Fig. 3.2 shows a side view of the pond with a layer of ice floating freely on the water. Fig. 3.2 The surface area of the pond is 5.0 m2. The mass of the ice is 690 kg. The density of water is 1000 kg/m3. Point X is 0.45 m below the ice. Calculate the pressure at point X due to only ice and water. pressure = …………………….…………. [3] 4 A student investigates the efficiency of a filament lamp. Fig. 4.1 shows the filament lamp with its glass bulb immersed in water in a beaker. Fig. 4.1

6 The reading on the thermometer in the water is 19.0°C. Only the glass of the lamp is in contact with the water and the electrical connections are completely insulated. The lamp is switched on. At the end of the experiment, the temperature of the water is 21.5 °C. (a) The mass of the water in the beaker is 600 g and the specific heat capacity of water is 4200J/(kg°C). (i) Show that the increase in the internal energy of the water is 6300 J. [2] (ii) In the experiment, the lamp is switched on for 500 s. The power supplied to the filament lamp is 13 W. The useful energy from the lamp is transferred as light. The energy that increases the temperature of the water is wasted energy. Determine the maximum possible efficiency of the filament lamp. maximum possible efficiency = …………………….…………. [3] (b) The efficiency of the lamp is less than the value determined in (a)(ii). Suggest one reason for this …………………………………………………………………………………………………… …………………………………………………………………………………………………… [1]

7 [Turn over 5 A rain sensor is attached to the glass windscreen of a vehicle to automatically control the windscreen wipers. Fig. 5.1 shows how the infrared light emitted from the LEDs in a rain sensor is received by infrared detectors. Fig. 5.1 (a) Explain why the infrared detectors are able to receive the infrared light. …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… [2] (b) Some of the infrared light is refracted when travelling from the glass windscreen into a raindrop, as shown in Fig. 5.2. Fig. 5.2. (i) Using Fig. 5.2, explain whether the raindrop or the windscreen is an optically denser medium. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… [1]

8 (ii) Calculate the refractive index for infrared light travelling from glass windscreen into raindrop. refractive index = …………………….…………. [2] (c) Explain how the