SNGS 2025 PHY PRELIM P2 QP+MS

Name ___________________________ ( ) Class ______________ PRELIMINARY EXAMINATION GENERAL CERTIFICATE OF EDUCATION ORDINARY LEVEL PHYSICS 6091/02 Paper 2 Theory 28 August 2025 1 hour 45 minutes READ THESE INSTRUCTIONS FIRST Write your name and index number on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams or graphs. Do not use highlighters, correction fluid or correction tape. Section A Answer all questions. Section B Section B consist of two questions. Answer only one out of these two questions. Students are reminded that all quantitative answers should include appropriate units. The use of 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. This document consists of 22 printed pages. [Turn over For Examiner’s Use Section A (70 Marks) Section B (10 Marks) Total (80 Marks)

2 Section A Answer all questions. 1 A remote drone of mass 5.0 kg is launched from the surface of a planet. Fig. 1.1 shows how the velocity of the drone varies with time until it lands back on the surface. After 1.7 s, the drone malfunctions and experiences a free fall. Fig. 1.1 (not to scale) (a) Explain how Fig. 1.1, from 1.7 s onwards, shows that air resistance on the drone is insignificant. …………………...…………………………………………………….…………….……. …………………...…………………………………………………………………..……. …………………...………………………………………………………………………[1] (b) Describe, in terms of velocity, the motion of the drone from 1.7 s to 9.0 s. …………………...…………………………………………………….…………….……. …………………...…………………………………………………………………..……. …………………...…………………………………………………….…………….……. …………………...…………………………………………………………………..……. …………………...…………………………………………………………………..….[3] 1.0 5.0 4.0 3.0 2.0 9.0 8.0 7.0 6.0 10.0 0 2 - 2 6 4 - 8 - 4 - 6 6.6 1.7 velocity m/s time / s

3 [Turn over (c) Calculate (i) the maximum height the drone reaches, maximum height = ……………………[2] (ii) weight of the drone near the surface of the planet. weight = ……………………….[2] [Total: 8]

4 2 Fig. 2.1 shows a drink can being lifted upwards by a helium-filled balloon. The mass of the drink can is 0.400 kg and the mass of the helium-filled balloon is negligible. Both the drink can and the balloon are rising upwards steadily with a constant speed. Take gravitational field strength g to b e 10 N/kg and assume air resistance to be negligible. (a) On Fig. 2.2, draw and label the force(s) that act on the drink can. [1] (b) Determine the magnitude of the upward force exerted by the helium-filled balloon on the drink can. upward force = …………………[1] (c) (i) State what is meant by work done. …………………...………………………………………………………………….. …………………...………………………………………………………………..[1] Fig. 2.1 drink can helium-filled balloon Fig. 2.2

5 [Turn over (ii) Describe, in terms of forces acting on the drink can, how this conservation of energy occurs. …………………...………………………………………………………………….. …………………...………………………………………………………………….. …………………...………………………………………………………………….. …………………...………………………………………………………………..[2] (d) When more helium is pumped into the balloon, both the drink can and balloon rise with an acceleration of 0.65 m/s2. Calculate the new upward force exerting on the can. upward force = ………………………[2] (e) As the balloon floats upwards, it pushes the air particles surrounding it. The force on these surrounding air particles is one half of an action-reaction pair of forces. Describe the other half of this action-reaction pair. …………………...……………………………………………………………….…..……. …………………...……………………………………………………….…………..….[1] [Total: 8]

6 3 A bottle on the ground is given a gentle push and it rolls over to a new position. Fig. 3.1 shows the rear view of the glass bottle on the ground at two different positions. Fig 3.1 (a) State the type of equilibrium that the bottle is in. …………………...…………………………………………………………………..….[1] Fig. 3.2 shows a side view of a glass bottle and a bottle holder in stationary position. Fig 3.2 (b) (i) Draw on Fig. 3.2, using “X”, the position of the centre of gravity of the setup which consists of the glass bottle and the bottle holder. [1] (ii) Hence, explain how the bottle holder is able to support the bottle in this position without toppling. …………………...………………………………………………………………….. …………………...…………………………………………………….……………. …………………...………………………………………………………………….. …………………...……………………………………………………………….[2] (c) Suggest a modification that can be made to the bottle holder to ensure that setup is more stable. …………………...…………………………………………………….…………….……. …………………...…………………………………………………………………..….[1] [Total: 5] ground ground before the push after the push holder

7 [Turn over 4 A manometer is connected to a gas pump on one end while the other end is open. Fig. 4.1 shows that when the gas pump is turned on, the oil level on the left side rises by 1.6 m. The atmospheric pressure is 1.0  105 Pa. The density of oil is 0.80 g/cm3. (a) Define pressure. …………………...…………………………………………………………………..….[1] (b) Calculate the pressure produced by the gas pump. Present your answer in the SI unit for pressure. pressure = ……………………[3] Fig. 4.1 pump oil 1.6 m 1.2 m

8 (c) A liquid with twice the density of oil is used in the manometer. Describe how the levels in the manometer would be affected by the pressure of the gas pump. Explain your answer. …………………...…………………………………………………….…………….……. …………………...…………………………………………………………………..……. …………………...…………………………………………………….…………….……. …………………...…………………………………………………………………..……. …………………...…………………………………………………………………..….[2] [Total: 6] 5 In a ripple tank experiment, water waves are produced by a n elongated dipper of frequency 50 Hz. Fig. 5.1 shows the wavefronts when viewed from the top of the ripple tank. The waves are produced in the deep section and move towards the shallow section as indicated by the direction of wave. Fig. 5.1 (not to scale) (a) State what is meant by frequency of 50 Hz. …………………...…………………………………………………………………..……. …………………...…………………………………………………………………..….[1] deep shallow direction of wave A

9 [Turn over (b) Determine the wavelength of the wave in the deep section. wavelength = [1] (c) Calculate the velocity of the wave in the deep section. velocity = [1] (d) On Fig 5.1, draw three wavefronts in the shallow section of the ripple tank. [2] (e) At time t = 0 s, water particle A is at the crest of a water wave as shown in Fig. 5.1. Sketch the displacement-time graph of particle A for next 0.04 s. [1] [Total: 6] time / s displacement / m

10 6 Fig. 6.1 shows a chart of the relative power of radiation emitted by objects at different temperatures against the wavelengths of the radiation. Fig 6.1 (a) Both the hot stove and the rock emit radiation. Explain why the hot stove appears red to an observer but not the rock. …..........................................