2024 CCHM Physics 6091 P2 (QP)

[Turn over Name: Class: Class Register Number: PRELIMINARY EXAMINATION 2024 SECONDARY 4 PHYSICS 6091/02 Paper 2 Theory 23 August 2024 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, class and register number clearly in the spaces provided at the top of this page. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions. Write your answers in the spaces provided. Section B Answer one question. 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 workings in a clear and orderly manner, as more marks are awarded for sound use of Physics than for correct answers. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Section A /70 Section B /10 Total / 80 This document consists of 22 printed pages.

2 2024 Preliminary Exam/CCHMS/Secondary 4/Physics/6091/02 Section A Answer all questions. 1 An aircraft pulls a glider along a runway as shown in Fig. 1.1. Fig.1.1 Fig. 1.2 shows the speed of the glider during the first 12 s of the motion. Fig. 1.2 (a) Describe the motion of the glider, in terms of acceleration, in the first 12 s. ……...…….….……………………………………………………………………………………… ……...…….….……………………………………………………………………………………… ……...……..…………………………………………………………………………………….. [2]

3 [Turn over 2024 Preliminary Exam/CCHMS/Secondary 4/Physics/6091/02 (b) In the first 6.0 s of the motion, there is a resultant force of 1880 N on the glider. Using the increase in speed in the first 6.0 s, calculate the mass of the glider. mass = ……………………………………………… [2] (c) Determine the distance travelled by the glider in the first 9.0 s of its motion. distance = ……………………………………………… [2] (d) The glider has no engine and stays in the air with the use of convection currents. (i) State what is meant by a ‘convection current’. ……..………………………………………………………………………………………… .…….….………………………………………………………………………………….. [1] (ii) Suggest how the convection currents that support the glider are formed. .……..………………………………………………………………………………………… .…….….………………………………………………………………………………….. [1] [Total: 8]

4 2024 Preliminary Exam/CCHMS/Secondary 4/Physics/6091/02 2 A plane, irregular lamina has a mass of 40 g. It hangs from a nail that passes through a small hole H near to the edge of the lamina. The nail acts as a pivot and the lamina can swing about it. The lamina is held in the position shown in Fig. 2.1, a small distance above a horizontal bench. Fig. 2.1 (not to scale) The centre of gravity of the lamina is at G. (a) The weight of the lamina is a force that acts downwards. Explain why the lamina experiences this downward force. ……...…….….……………………………………………………………………………………… ……...……..…………………………………………………………………………………….. [1] (b) The weight produces a moment about the pivot through H. (i) Using Fig. 2.1, calculate the moment of the weight about the pivot. moment = ……………………………………………… [2]

5 [Turn over 2024 Preliminary Exam/CCHMS/Secondary 4/Physics/6091/02 (ii) The lamina is now released from the position shown in Fig. 2.1. Describe what happens to the lamina from the time it is released until it stops moving. …….….……………………………………………………………………………………… .…….….……………………………………………………………………………………… ……..………………………………………………………………………………………… .…….….………………………………………………………………………………….. [3] [Total: 6]

6 2024 Preliminary Exam/CCHMS/Secondary 4/Physics/6091/02 3 A fixed mass of gas in a glass tube is trapped by a seal at one end of the tube and by a column of mercury. The mercury is free to move within the tube. The tube is rotated slowly from the vertical as shown in Fig. 3.1 to the horizontal as shown in Fig. 3.2. The volume of the gas increases and its temperature remains constant. (a) (i) Describe why rotating the tube changes the pressure of the gas in the sealed end. ….....….……………………………………………………………………………………... .......………………………………………………………………………………………. [1] (ii) Using ideas about particles, explain why the particles of the gas trapped inside the tube by the mercury exert a pressure on the glass tube. .....….………………………………………………………………………………………... ….....….……………………………………………………………………………………... ............…………………………………………………………………………………… [2] (b) In Fig. 3.1, the length of the mercury column is 0.30 m. The density of mercury is 13600 kg / m3. Atmospheric pressure is 101 kPa. Calculate the pressure of the gas in the tube. pressure = ……………………………………………… [2] [Total: 5]

7 [Turn over 2024 Preliminary Exam/CCHMS/Secondary 4/Physics/6091/02 4 Fig. 4.1 shows a rider on an electric scooter. Fig. 4.1 The scooter contains a battery and a motor to drive the back wheel. (a) (i) State the name of the energy store in the battery. .......………………………………………………………………………………………. [1] (ii) Describe, in terms of work done, the stages of energy transfer from the energy store in the battery to the kinetic store of the scooter. .…….….……………………………………………………………………………………… ……..………………………………………………………………………………………… .…….….………………………………………………………………………………….. [2] (b) The total weight of the scooter and the rider is 800 N. Calculate the total energy in the kinetic store of the rider and scooter when the scooter has a speed of 5.5 m / s. total energy = ……………………………………………… [2]

8 2024 Preliminary Exam/CCHMS/Secondary 4/Physics/6091/02 (c) The battery is marked ‘energy capacity 0.45 kilowatt-hour (kW h)’. (i) Define what is meant by a kilowatt-hour. ..…….….…………………………………………………………………………………….. .......………………………………………………………………………………………. [1] (ii) The scooter stops working because the battery is totally discharged (flat). This means that there is no more energy stored in the battery. The battery is then recharged using a 75 W power supply. Calculate the time taken to fully recharge the battery. time taken = ……………………………………………… [2] [Total: 8]

9 [Turn over 2024 Preliminary Exam/CCHMS/Secondary 4/Physics/6091/02 5 A student investigates the efficiency of a filament lamp. Fig. 5.1 shows the filament lamp with its glass bulb immersed in water in a beaker. Fig. 5.1 The reading on the thermometer in the water is 28.0 °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 31.5 °C. (a) The mass of the water in the beaker is 500 g and the specific heat capacity of water is 4200 J / (kg °C). (i) Calculate the increase in the internal energy of the water. increase in internal energy = ……………………………………………… [2] (ii) In the experiment, the lamp is switched on for 600 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. efficiency = …………….…….………………………… [3]

10 2024 Preliminary Exam/CCHMS/Secondary 4/Physics/6091/02 (b) The efficiency of the lamp is less than the value determined in (a)(ii).