2023 TPSS Phy Prelims P2

This document consists of 20 printed pages. © TPSS/6091/02/2023/SEC4/PRELIM TAMPINES SECONDARY SCHOOL Secondary Four Express PRELIMINARY EXAMINATION 2023 NAME CLASS REGISTER NUMBER PHYSICS 6091/02 Paper 2 Theory 21 Aug 2023 1 hour 45 minutes Candidates answer on the Question Paper No Additional Materials are required READ THESE INSTRUCTIONS FIRST Write your name, class and register number on all the work you hand in. Write in 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. Section A Answer all questions. Section B Answer all questions. Question 12 has a choice of parts to answer. 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. O For Examiner’s Use SECTION A (50 marks) SECTION B (30 marks) significant figure units TOTAL (80 marks)

2 Section A Answer all questions in the spaces provided. 1 Fig. 1.1 shows the velocity-time graph of a car. It was initially travelling to the left. Fig. 1.1 (a) (i) State how acceleration of the car can be found from a velocity-time graph. …...………………………………………………………………………………………..... [1] (ii) Determine the acceleration of the car in the first 4 min. Leave your answer in S.I. units. acceleration = ……………………… [2] (b) State what the shaded area on Fig. 1.1 represents. ..………………………………………………………………………………………………..... [1] (c) State the time when the car changed direction. ..………………………………………………………………………………………………..... [1] velocity m/s t / min 2 - 2 - 4 0 1 2 5 643 87

3 (d) Calculate the displacement of the car after 8 min and state the direction of the displacement. displacement = ……………………… [2] direction = ……………………… [1] 2 Fig. 2.1 shows two blocks, initially at rest, being pushed by force F from the left along a rough surface. The mass of block A is 3.0 kg while the mass of block B is 15 kg. As the blocks are pushed, they accelerate at a constant rate of 2.0 m/s2. The frictional force acting on block A is 1.8 N and the frictional force acting on B is 9.0 N. Fig. 2.1 (a) Determine the magnitude of the force F. magnitude = ……………………… [2] (b) By considering the forces acting on block B, determine the magnitude of the contact force between blocks A and B. F A B rough surface

4 magnitude = ……………………… [2] 3 In Fig. 3.1, Papa Lim and Crystal stood on a uniform board. The board weighs 40 N and the support is under the centre of gravity of the board. Papa Lim and Crystal weigh 810 N and 400 N respectively. Papa Lim is standing 0.80 m from the support. Fig. 3.1 (a) Explain what is meant by “… centre of gravity of the board”. ..………………………………………………………………………………………………..... [1] (b) Calculate how far from the support should Crystal stand, to balance the system. distance = ……………………… [2] (c) Determine the magnitude of the upward force exerted on the board by the support. magnitude = ……………………… [1] 810 N 400 N 0.80 m support

5 4 (a) In Fig. 4.1, a ray of light is incident on a right-angled prism of refractive index 1.5. Fig. 4.1 (i) Calculate the angle of refraction of the ray on the face AC. angle = ……………………… [1] (ii) Explain whether this ray within the prism will undergo total internal reflection when it hits the face AB. Show any essential working clearly. …...………………………………………………………………………………………..... …...………………………………………………………………………………………..... …...………………………………………………………………………………………..... [3] A B C 50 o 45 o

6 (b) Fig. 4.2 shows a thin converging lens used to produce an image X’ of an object X. Fig. 4.2 (i) By completing Fig. 4.2 with suitable light rays, locate the position of the lens’ principal focus. Label the principal focus F. [3] (ii) State how the image will change when the half the converging lens is being covered up. …...………………………………………………………………………………………..... [1] 5 Athan standing at a pier noticed wavefronts going towards the seashore. Fig. 5.1 shows the top view of the wavefronts, from when they were far away from shore to the time when they are significantly nearer to shore. P and Q are two points along the wave. Fig. 5.1 Fig. 5.2 shows the 7.8 m …… …… …… …… ● P ● Q far away from shore near to shore displacement / m 0 8.0 time / s 0.30 -0.30 converging lens XX’ principal axis

7 displacement-time graph of a particle at P, starting from the instant shown in Fig. 5.1. Fig. 5.2 (a) Determine the wavelength of the wave at P. wavelength = ……………………… [1] (b) Calculate the speed of the wave at P. speed = ……………………… [2]

8 (c) State the period of the particle at Q. ..………………………………………………………………………………………………..... [1] (d) Comment on how the speed of the particle, frequency of wave and the depth of sea at Q change as compared to P. speed:...……..………………………………………………………………………………..... ..………………………………………………………………………………………………..... frequency:.…..………………………………………………………………………………..... ..………………………………………………………………………………………………..... depth:....……..………………………………………………………………………………..... ..………………………………………………………………………………………………..... [3] 6 In Fig. 6.1, a car becomes electrically charged as it travels along a road. Fig. 6.1 (a) Explain how a moving car becomes positively charged. ..………………………………………………………………………………………………..... ..………………………………………………………………………………………………..... [1] (b) Explain why the charges remain on the car after it has stopped moving. ..………………………………………………………………………………………………..... ..………………………………………………………………………………………………..... [1]

9 (c) Some car owners fixed a metal strap underneath the car as shown in Fig. 6.2. The metal strap is in contact with the ground as the car moves. Fig. 6.2 Explain how the metal strap prevents the car in Fig. 6.1 from becoming charged. ..………………………………………………………………………………………………..... ..………………………………………………………………………………………………..... ..………………………………………………………………………………………………..... [2] 7 The circuit set up in Fig. 7.1 has a variable resistor XY that varies between 0 Ω to 1000 Ω. Fig. 7.1 (a) Identify how each meter’s reading will change as slider contact P moves from Y to X. Circle the correct answer. [3] Reading of Ammeter A1: increases / decreases / no change Reading of Ammeter A2: increases / decreases / no change Reading of Voltmeter V1: increases / decreases / no change Reading of Voltmeter V2: increases / decreases / no change metal strap 1000 Ω 10 V A2 A1 V2 X Y PV1

10 (b) Determine the reading of ammeter A1 when slider contact P stops midway between X and Y. reading = ……………………… [2] 8 Fig. 8.1 shows a wire bent into a U shape frame labelled ABCD supported on two knife edges. The knife edges support the wire at P and Q. Fig. 8.1 The section PBCQ of the wire frame is then placed within a coil of wire. The top view of the set-up is as shown in Fig. 8.2. Fig. 8.2 The electrical source is connected in parallel to the coil of wire and the wire frame. The U shape wire frame is horizontal when the switch S is opened. When the switch S is closed, current flows into the wire frame and coil of wire. Current from the source flows into the wire frame at P and leaves via Q. When the current flows in the frame, the U shape wire frame is observed to rotate about the knife edge. (a) State which direction will the U shape wire frame rotate. Explain why this occurred. ..………………………………………………………………………………………………..... ..………………………………………………………………………………………………..... ..………………………………………………………………………………………………..... ..………………………………………………………………………………………………..... [3] A P B B C C D Q coil of wire S A D P B CQ