NYGH Prelim 2024 P2 sharing

南洋女子中学校 NANYANG GIRLS' HIGH SCHOOL Preliminary Examination 2024 Secondary Four 'O' Level CANDIDATE NAME CENTRE NUMBER S INDEX NUMBER PHYSICS 6091/02 Paper 2 26 Aug 2024, Monday 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your class, index number and name on all the work you hand in. 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. DO NOT WRITE ON ANY BARCODES. 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 working 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 Examiner’s Use Paper 1 Section A 1 2 3 4 5 6 7 8 9 10 11 12 Section B 13 14 Total 120 % Setter: This document consists of 22 printed pages and 2 blank pages. [Turn over

2 Section A (70 marks) Answer all questions in this section. 1 Fig. 1.1 shows a toy water rocket. Fig. 1.1 The rocket is half-filled with water and connected by rubber tubing to a pump. (a) Explain, in terms of particles, how air molecules inside the rocket create a pressure on the walls of the rocket. ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... .................................................................................................................................. [2]

3 [Turn over (b) The rocket is placed on a launch platform. Air is then pumped into the rocket so that the pressure of the air inside the rocket increases. The rocket takes off vertically. Fig. 1.2 shows the rocket’s motion in the first 2.0 s. Air resistance is ignored. Fig. 1.2 (i) Determine the maximum height rocket risen by the rocket. height = …………………………….[2] (ii) Complete the velocity time graph in Fig. 1.2 until the rocket hits the ground at t = 4.5 s. [1] (iii) Determine the height of the launch platform. height = …………………………….[1] velocity m / s time t / s 1.0 00 2.0 0 3.0 00 4.0 0 5.0 0 20 10 -10 -20 -30 0 0.0 0

4 2 A plane, irregular lamina has a mass of 50 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 (a) The centre of gravity of the lamina is at G. (i) Calculate the weight, W of the lamina on Earth weight = …………………………….[1] (ii) Describe the other force that is part of Newton’s Third Law action-reaction pair with W. ............................................................................................................................ ........................................................................................................................[1] (b) W produces a moment about the pivot through H. (i) Using Fig. 2.1, calculate the moment of the weight about the pivot. moment = …………………………….[2] (ii) The lamina is now released from the position shown in Fig. 2.1. The lamina oscillates initially. Explain the final position of the lamina at equilibrium. ............................................................................................................................ ............................................................................................................................ ............................................................................................................................ ........................................................................................................................[2]

5 [Turn over 3 Fig. 3.1 shows the particles (molecules) in a sample of liquid water. Fig. 3.1 (a) Explain, using ideas about particles, why liquids expand more than solids for the same temperature rise. ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... .................................................................................................................................. [2] (b) An electric heater is used to heat a sample of metal, as shown in Fig. 3.2. Fig. 3.2 The metal has a mass of 200 g and is initially at 15 °C. The heater is switched on for 2.0 minutes and then switched off. The maximum temperature reached by the metal is 40 °C. The power of the heater is 20 W. Calculate the specific heat capacity of the metal. specific heat capacity = …………………………….[3]

6 4 An oscillator is attached to one end of a long elastic string as shown in Fig. 4.1. The other end of the string is stretched taut. Fig. 4.1 shows the shape of the string a certain time after the oscillator has started. P is a point on the string. Fig. 4.1 (a) A student suggests that the wave produced along the string is a transverse wave. Explain if you agree with the suggestion. ....................................................................................................................................... ....................................................................................................................................... .................................................................................................................................. [2] (b) On Fig. 4.1, sketch the waveform in the string half a period later. Locate the position of P in your sketch and label it X. [2] P

7 [Turn over 5 Fig. 5.1 shows two flat metal plates positioned horizontally, one above the other. The positive terminal of a high-voltage supply unit is connected to the bottom plate and the negative terminal is connected to the top plate. Fig. 5.1 The high-voltage supply is switched on. A small charged oil droplet is placed between the two metal plates. The oil droplet remains stationary in mid-air. (a) State the charge of the oil droplet. .................................................................................................................................. [1] (b) Explain in terms of the forces acting why the oil droplet remains stationary. ....................................................................................................................................... ....................................................................................................................................... .................................................