GMSS Prelim P2

Candidate Name Class Index Number _______________________________________________________________ PHYSICS Paper 2 6091/02 Sec 4 Express Candidates answer on the Question Paper. No Additional Materials are required. 1 hour 45 minutes 13 August 2024 READ THESE INSTRUCTIONS FIRST Write your name, index number and class 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, highlighters, 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 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. Acceleration due to gravity, g, is assumed to be 10 m/s2 unless otherwise specified. For Examiner’s Use Section A /70 Section B /10 Total /80 This document consists of 19 printed pages and 1 blank page. [Turn over Geylang Methodist School (Secondary) Preliminary Examination 2024

2 GMS(S)/Physics/P2/Prelim/2024/4E Section A Answer all questions. 1 Fig. 1.1 shows the velocity-time graph for the first 80 s after an object is dropped from rest at a height of 2000 m above the ground. Fig. 1.1 The object has a mass of 9.0 kg. (a) State the acceleration of the object at 0 s. acceleration = ……………………… [1] (b) Describe the motion from 0 to 80 s. ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………[4] (c) Describe the energy transfer when the object is travelling at terminal velocity. ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………[2]

3 GMS(S)/Physics/P2/Prelim/2024/4E (d) Calculate the maximum possible air resistance acting on the object when the object is falling at terminal velocity. maximum air resistance = ……………….………[1] 2 A 7.0 kg picture frame is being suspended from a nail by a string. The string forms two segments L1 and L2, as shown in the Fig. 2.1. L1 and L2 make an angle of 35° and 60° with the vertical respectively. Fig. 2.1 (a) In the space below, draw a vector diagram to determine the tensions in segments L1 and L2. Specify the scale used. scale = ……………………. , tension in L1 = ………. , tension in L2 = ………. [4]

4 GMS(S)/Physics/P2/Prelim/2024/4E (b) State the magnitude and direction of the force by the nail, on the string. ………………………………………………………………………………………………... ………………………………………………………………………………………………... ………………………………………………………………………………………..……[2] (c) The picture frame was adjusted such that both segments of the string make an equal angle with the vertical. State the changes to the tensions in segment L1 and L2 and how their magnitudes compare. ………………………………………………………………………………………………... …………………………………………………………………………………………..…[2] 3 Fig. 3.1 shows a man holding a 0.20 N object in his hand with his forearm in a horizontal position. He can support the object in this position because the flexor muscle exerts a force, FM vertically upward on the forearm. The man's forearm weighs 22 N and its centre of gravity (C.G.) is indicated in the diagram. The forearm can rotate about the elbow joint. Fig. 3.1 (a) Calculate the value of FM. FM = …………. [2]

5 GMS(S)/Physics/P2/Prelim/2024/4E (b) To keep the forearm in the horizontal equilibrium position, the upper arm bone exerts a force at the elbow joint. Determine the magnitude and direction of this force. magnitude = ………………………. direction is ……………….……[3] (c) Explain why the force in (b) is not considered in the calculation in (a). ………………………………………………………………………………………………... …………………………………………………………………………………………..…[1] 4 Fig. 4.1 shows two vertical tubes P and Q, each closed at the upper end. The pressure in the space above the mercury meniscus in tube P is 16800 Pa. The pressure in the space above the mercury meniscus in tube Q is unknown. Fig. 4.1 Take the density of mercury to be 13600 kg/m3

6 GMS(S)/Physics/P2/Prelim/2024/4E (a) Using the information provided, calculate (i) the atmospheric pressure; atmospheric pressure = ……………………………. [2] (ii) the pressure in the space above the mercury meniscus in tube Q. pressure = ……………………………. [2] (b) Due to a small knock, tube Q is slightly shifted and ends up at an angle 15° to the vertical, as shown in Fig. 4.2. Fig. 4.2 On Fig. 4.2, draw the new level of the mercury meniscus in tube Q, and explain your answer. ………………………………………………………………………………………………... ………………………………………………………………………………………………... …………………………………………………………………………………………..…[2]

7 GMS(S)/Physics/P2/Prelim/2024/4E 5 Fig. 5.1 shows the structure of a water cooler that supplies cold water. Fig. 5.1 (a) In the refrigerator unit, a coolant is pumped through the copper pipe. Explain how energy is transferred from the water to the coolant in the pipe. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. …………………………………………………………………………………………..…[2] (b) Describe how the entire tank of water is cooled. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. …………………………………………………………………………………………..…[2] (c) Explain how the polished aluminium tank helps to keep the water cold. ……………………………………………………………………………………………….. …………………………………………………………………………………………..…[1]

8 GMS(S)/Physics/P2/Prelim/2024/4E 6 Fig. 6.1 shows the equilibrium positions of some particles in a medium at time t = 0 s. When a longitudinal wave travels through this medium, the displacements of these particles at time t = 1 s are shown in the displacement - position graph (Fig. 6.2). (a) Mark the positions of the particles A – J at the time t = 1 s in the space provided in Fig. 6.3 with reference to the displacement - position graph shown in Fig. 6.2. [1] (b) With reference to your answer to (a) which particle(s) is/are at the (i) centre of compression, particle(s) ……………………………. [1] (ii) centre of rarefaction. particle(s) ………….…………………. [1] (c) If the speed of the wave is 340 m s-1, find the period of the wave. period = ………….…………………. [2]

9 GMS(S)/Physics/P2/Prelim/2024/4E 7 Fig. 7.1 shows a converging lens. Parallel rays of light from point A which is from the top of a distant building is brought to a focus at I. Parallel rays of light from another point B which is from the bottom of the same building is incident on the lens as shown. One of the ray from A is refracted as shown. Fig. 7.1 (a) Complete the rays from A and B on Fig. 7.1 to show how the image is formed. [2] (b) Indicate on Fig 7.1 the height of the image with letter h and principal focal point with the letter F. [2] 8 LASER is the acronym for Light Amplification by Simulated Emission of Radiation. Table 8.1 shows different brands of laser guns for industrial use and their specific wavelengths. All laser guns emit electromagnetic waves. An enthusiastic laser user sorts out the different brands of laser guns into Types I, II and III. He also discovers that