2024 PGSS Physics Prelim P2

EXP PUNGGOL SECONDARY SCHOOL SECONDARY 4 EXPRESS 2024 PRELIMINARY EXAMINATION QUESTION BOOKLET NAME CLASS INDEX NUMBER Physics Paper 2 6091/02 22 August 2024 1 hour 45 minutes READ THESE INSTRUCTIONS FIRST Write your class, register number and name on all the work you hand in. You may use a soft pencil for any diagrams, graphs, tables or rough working. Write in dark blue or black pen. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. Section A Answer all questions. Write your answers in the spaces provided on the question paper. Section B Answer one question. Write your answers in the spaces provided on the question paper. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s use Parent’s Signature Section A /70 Section B /10 Total /80 This paper consists of 22 printed pages and 0 blank page.

2 Section A Answer all the questions in the spaces provided. 1 Fig. 2.1 shows how the velocity of a vehicle changes with time. Fig. 1.1 (a) Describe how the displacement of t he vehicle changes from t = 0 s to t = 80 s. ………………………………..…………………………………………………... ………………………………..…………………………………………………... ………………………………..…………………………………………………... ……………………………………………………………………………… [2] (b) Calculate the average velocity for the whole journey. average velocity = ……………….… [3] (c) Calculate the deceleration of the vehicle at t = 204 s. deceleration = ……………………… [2] [total: 7] 30 25 20 15 10 5 0 20 40 60 80 100 120 140 160 180 200 220 velocity m/s time / s

3 2 Fig. 2.1 shows an aircraft dropping a crate of supplies to a region that is difficult to reach by land vehicles. Fig. 2.1 At a certain instant in the crate’s descent, it experiences a total resistive force of 1200 N. The total weight of the crate and its contents, including the parachute, is 2500 N. (a) Draw and label the forces acting on the crate shown in Fig. 2.1 at this instant. [1] (b) Calculate the total mass of the crate and its contents. The gravitational field strength is 10 N / kg. mass = ………………….. [1] crate

4 (c) Calculate the acceleration of the crate at the instant shown in Fig. 2.1. acceleration = ……………………… [3] (d) Suggest one factor that could affect the air resistance acting on the crate. ……………………………………………………………………………... [1] (e) As the crate continues descending, it eventually attains terminal velocity. Explain why the crate attains terminal velocity in terms of forces. …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………………… ……………………………………………………………………………... [2] [total: 8]

5 3 A heater is placed at the bottom of a liquid. The liquid is heated until it becomes a gas. Fig. 3.1 shows the variation with time of the temperature of the substance. Fig. 3.1 The heater used to heat up the substance transfers energy to the substance at a steady rate. (a) Describe how the heat is transferred efficiently throughout the liquid. …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………….. [2] (b) Explain, in terms of energy stores, why the temperature of the substance rises from A to B while the temperature remains constant from B to C, when the heater is operating normally. …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………….. [2] (c) The experiment is repeated using twic e the volume of the liquid while keeping all other variables constant. Sketch on Fi g. 3.1 to show the new variation of temperature with time. [1] time / min temperature / °C 25.0 62.6 100.0 A B C D

6 (d) Describe the changes to the arr angement of the particles from B to C using the kinetic particle model of matter. …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………….. [1] [total: 6] 4 Smoke particles are observed under a microscope. The particles are observed to move about randomly. (a) Explain why the smoke particles appear to move about randomly. …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………….. [2] (b) The lamp of the microscope heats up the sample of smoke particles being observed. (i) Predict how the motion of the smoke particles would be different. ……………………………………………………………………………. ……………………………………………………………………… [1] (ii) Explain your answer to (b)(i). ……………………………………………………………………………. ……………………………………………………………………… [1] [total: 4]

7 5 Fig. 5.1 shows a manometer used to measure the pressure of a gas in a syringe that is connected to one end of the m anometer. The manometer is filled with mercury which has a density of 13 600 kg / m3. Fig. 5.1 (a) Explain how the gas particles in the syringe are able to exert such a high pressure to lift the column of mercury in the manometer on the right arm. …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………….. [2] (b) The atmospheric pressure is 760 mm Hg. Calculate the gas pressure. Leave your answer in mm Hg. gas pressure = ………………………mm Hg [1] gas manometer metre rule

8 (c) Fig. 5.2 shows the piston pushed further to the right by a force F and the mercury level on the right arm of the manometer is observed to rise. Fig. 5.2 (i) Explain why the mercury level on the right arm rises when the piston is pushed to the right using the ideas of particles. ……………………………………………………………………………. ……………………………………………………………………………. ……………………………………………………………………… [1] (ii) Calculate the increase in gas pressure with reference to Fig. 5.1 and Fig 5.2. Leave your answer in Pa. The gravitational field strength is 10 N / kg. gas pressure = ……………………… Pa [2] (iii) The cross-sectional area of the piston is 12 cm 2. Calculate the magnitude of the force F, assuming that no energy was transferred out of the system. force = ……………………… [2] [total: 8] syringe manometer piston 64.0 cm

9 6 Visible light is a component of the electromagnetic (EM) spectrum, which consists of waves of different wavelengths. All EM waves can undergo reflection and refraction. (a) State one other property that is common for all components of the electromagnetic spectrum. …………………………………………………………………………………... …………………………………………………………………………….. [1] (b) Fig. 6.1 shows a ray of blue light ent ering a glass block from air. The refractive index of the glass block is 1.52. The ray bends to hit surface PQ. Fig. 6.1 (i) Calculate the angle of refraction for this ray. angle of refraction = ………………. ° [2] (ii) Calculate the critical angle for the glass block. cr