Yuan Ching Prelim P2

YUAN CHING SECONDARY SCHOOL Secondary Four Express Course Preliminary Examination 2024 CANDIDATE NAME CLASS INDEX NUMBER PHYSICS Paper 2 Theory Candidates answer on the Question Paper. No Additional Materials are required. 6091/02 10 September 2024 1 hour 45 minutes 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 on both sides of the paper. You may use a soft pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Section A (70 marks) Answer all questions. Section B (10 marks) Answer one out 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. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Section A Section B Total This paper consists of 19 printed pages. The total number of marks for this paper is 80.

2 Section A (70 marks) Answer all questions. 1 A stone falls from the top of a cliff into the sea, as shown in Fig. 1.1. The speed-time graph for the stone is shown in Fig. 1.2. Fig. 1.1 Fig. 1.2 (a) Describe the speed of the stone from A to B. ……………………………………………………………………………………………… ………………………………………………………………………………………...… [1] (b) Explain, in terms of the forces acting on the stone, why (i) there is a sudden decrease in the speed of the stone from B to C, ……………………………………………………………………………………… ……………………………………………………………………………………… ..………………………………………………………………………………… [2] (ii) the speed of the stone is constant from D to E. ……………………………………………………………………………………… ……………………………………………………………………………………… ..………………………………………………………………………………… [2] speed / ms-1 time / s D E cliff falling stone sea A 0 0 B C

3 2 Fig. 2.1 shows a pendulum of weight 5.0 N suspended from point P. A horizontal force F pulls on the string to the right such that the string is at rest 40° to the vertical. Fig. 2.1 Using scaled vector diagram in the space below, determine the magnitude of the horizontal force F. scale: …………………………… magnitude of F: ……………………….. [4] P 40  F

4 3 Fig. 3.1 shows a large container ship travelling at a constant speed of 9.5 m/s in a straight line. Fig. 3.1 (a) The total resistive force acting on the ship is 3.2 x 106 N. Calculate the work done against the resistive force on the ship in 1.0 s. work done = ……………………………. [2] (b) The engines are powered by fuel. (i) Describe the energy transfer that is taking place when the ship is travelling at constant speed. ………………………………………………………………………………………… ………………………………………………………………………………………... …………………………………………………………………………………… [2] (ii) The mass of the ship is 2.4 x 108 kg. The engines are switched off and the resistive force causes the ship to decelerate. Calculate the initial deceleration of the ship. deceleration = ……………………………. [2] (iii) Explain why the ship takes a long time to come to a stop despite a large resistive force. ………………………………………………………………………………………… ……………………………………………………………………………………… [1]

5 4 A uniform wooden plank AB which is 4.0 m long and has a weight of 50 N. It leans with its upper end against a frictionless vertical wall and its lower end on a rough ground as shown in Fig. 4.1. P is the normal reaction force acting on the top of the plank due to the wall. Q is the normal reaction force acting on the bottom of the plank due to the ground. (a) On Fig. 4.1, draw the (i) gravitational force acting on the ladder, label it W, [1] (ii) frictional force on the ladder, label it F. [1] (b) State the magnitude of the force Q. force Q = …………………. [1] (c) Taking moments about A, calculate the magnitude of the frictional force F. F = ………………….. [2] Fig. 4.1 P Q A B 4.0 m 5.0 m 3.0 m

6 5 Fig. 5.1 shows two glass bulbs with trapped gas inside them. They are connected together by a tube containing liquid mercury. Take g as 10.0 N/kg and density of mercury as 13 600 kgm-3. (a) State and explain which gas has a lower pressure. …….....……………………………………………………………………………………... . …….....………………………………………………………………………………….. [1] (b) Given that H1 = 30.0 cm, H2 = 37.0 cm and gas A has a pressure of 120 000 Pa, calculate the pressure of gas B. pressure of gas B = ……………………. [2] (c) The whole set up is then placed under the hot sun. Explain, in terms of the kinetic model of matter, why the pressure of both gases increases. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. …………………………………………………………………………………………… [3] Fig. 5.1 mercury Gas B Gas A H1 = 30.0 cm H2 = 37.0 cm

7 6 Fig. 6.1 shows the inner vessel of a vacuum flask containing ice cold water. Fig. 6.1 (a) Explain how the vacuum in the vacuum flask prevented energy gained by the ice- cold water. ……………………………………………………………………………………………… .…………………………………………………………………………………………….. …………………………………………………………………………………………… [2] (b) Explain how the air above the ice-cold water reduces energy gained by the water. ……………………………………………………………………………………………… ……………………………………………………………………………………………… …………………………………………………………………………………………… [2] silvered surface vacuum ice cold water

8 7 Fig. 7.1 shows the positions of particles of a medium at a particular instant when a sound wave, travelling from left to right, passes through the medium. Before the wave arrived, the particles were all spaced equally apart on the vertical lines shown. Fig. 7.1 (a) By making measurements on Fig. 7.1, determine the (i) wavelength of the wave, wavelength = ………………………… [1] (ii) amplitude of the wave. amplitude = ………………………… [1] (b) On Fig. 7.2, sketch the displacement-distance graph of the particles between P and R. Take the displacement to the right of equilibrium position as positive. [1] Fig. 7.2 Q RP displacement / cm distance / cm Q RP

9 8 The thin converging lens shown in Fig. 8.1 below has a focal length of 3.0 cm. An object O is placed in front of the lens. Fig. 8.1 (a) On Fig. 8.1, locate and draw the image formed. Label it as I. [3] (b) On Fig. 8.1, complete the path of the ray PQ. [1] (c) If the upper half of the lens is broken, describe and explain how it will affect, if at all, the position of the image formed. ……………………………………………………………………………………………… ……………………………………………………………………………………………… …………………………………………………………………………………………… [2]