2024 SNGS Physics Prelim P2 QP

1 SNGS Sec 4 Physics Prelim P2 2024 Name ___________________________ ( ) Class ______________ PRELIMINARY EXAMINATION GENERAL CERTIFICATE OF EDUCATION ORDINARY LEVEL PHYSICS 6091/02 Paper 2 Theory 21 August 2024 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 24 printed pages. [Turn over] For Examiner’s Use Section A (70 Marks) Section B (10 Marks) Total (80 Marks)

2 SNGS Sec 4 Physics Prelim P2 2024 Section A (70 marks) Answer all the questions in this section. 1 A firework leaves the ground with an intial velocity of 45 m/s, travelling vertically upwards. When it reaches a height of 100 m, it fails to explode and falls back down the same vertical path to the ground. At any point on its path, the firework has both a speed and a velocity. (a) Explain the difference between speed and velocity. …………………………………………………………………………… …………………………………………………………………………… [1] (b) Fig. 1.1 shows the displacement-time graph for the first 5.0 s of the motion. Fig. 1.1 (i) Determine the time taken for the firework to reach the maximum height. time taken = ……………………… [1] displacement from ground / m time / s

3 SNGS Sec 4 Physics Prelim P2 2024 (ii) Describe the motion of the firework for the first 5.0 s of its journey. …………………………………………………………………….... …………………………………………………………………….... …………………………………………………………………….... .................................................................................................. [2] (c) The air resistance acting on the firework is negligble. The table below is for the magnitude and direction of the acceleration of the firework. Complete the table. Give the unit for the magnitude of any acceleration that you write down. magnitude direction as the firework moves upwards at maximum height [2] (d) In another situation, the firework falls vertically in a horizontal wind. Fig. 1.2 shows the horizontal and vertical velocity of the firework, drawn to a scale where a length of 1.0 cm represents a speed of 10 m/s. On Fig 1.2, draw the resultant velocity of the firework. Label it with the letter R and its magnitude. Give your answer to a suitable number of significant figures. Fig. 1.2 (to scale) [total: 8] [2]

4 SNGS Sec 4 Physics Prelim P2 2024 2 Fig. 2.1 shows a farmer lifting a barrel of fruit from the ground to a platform. Fig. 2.1 Fig. 2.1 Fig. 2.2 (a) Fig. 2.2 shows an enlarged diagram of the barrel of fruit lifted by the farmer and one of the two forces acting on the barrel. Describe the force that forms an action-reaction pair with the force drawn in Fig. 2.2. ……………………………………………………………………………. [1] (b) The farmer lifts the barrel of fruit at a constant speed. The mass of the barrel of fruit is 14 kg. (i) Calculate the work done on the barrel of fruit in lifting it from the ground to the platform. The gravitational field strength is 10 N/kg. work done = …………………… [1] weight of barrel of fruit

5 SNGS Sec 4 Physics Prelim P2 2024 (ii) Describe the energy transfer as the farmer lifts the barrel of fruit. ……………………………………………………………………… ……………………………………………………………………… [1] (c) The farmer wants to make the process faster. He buys a machine to lift the barrels of fruit. (i) The output power of the machine is 75 W. Calculate the time taken for the machine to lift a barrel of fruit onto the platform. time taken = ………………. (ii) When the barrel of fruit is near to the platform, the farmer adjusts the output power and decreases the upward force produced. The barrel decelerates with a value of 0.50 m/s2. Calculate the upward force produced by the machine. upward force = ………………. [total: 7] [2] [2]

6 SNGS Sec 4 Physics Prelim P2 2024 3 Fig. 3.1 shows a pot on a hotplate. The hotplate heats up the pot and water. Fig. 3.1 (a) Describe how water is heated by convection. ……………………………………………………………………............ ……………………………………………………………………............ [2] (b) Suggest why (i) the handle of the pot is made of wood, ……………………………………………………………………… ……………………………………………………………………… (ii) the side of the pot is made of a shiny material, ……………………………………………………………………… ……………………………………………………………………… (iii) the base of the pot is made of copper. ……………………………………………………………………… ……………………………………………………………………… [total: 5] [1] [1] [1]

7 SNGS Sec 4 Physics Prelim P2 2024 4 Fig. 4.1 shows a ray of light passing into a right-angled prism at D. After reaching E, the light travels along two paths, with one ray travelling along the surface of the prism and one ray along EF. Fig. 4.1 (a) State one property of light that change s at D and whether it increases or decreases. ……………………………………………………………………………. ……………………………………………………………………………. [2] (b) (i) On Fig.4.1, identify the critical angle and label with letter X. (ii) Hence, determine the refractive index of this glass. refractive index = ……………… (iii) The prism is replaced with another one with a greater refractive index. Describe what happens to the path of light. …………………………………………………………………… …………………………………………………………………… [1] [2] [1] 45 45

8 SNGS Sec 4 Physics Prelim P2 2024 (c) Visible light is a type of electromagnetic wave. All electromagnetic waves transfer energy and travel through vacuum at a speed of 3.0 × 108 m/s. (i) State one other property common to all components of the electromagnetic spectrum. ……………………………………………………………………… (ii) The wavelength of red light is 690 nm. Calculate the frequency of this wave in vacuum. frequency = ………………….. [total: 9] [1] [2]

9 SNGS Sec 4 Physics Prelim P2 2024 5 Fig. 5.1 shows the I/V characteristic graph for a filament lamp and a resistor. Fig. 5.1 (a) Describe how Fig. 5.1 shows that the resistor obeys Ohm’s Law. …………………………………………………………………….……… ………………………………………………………………………….… ……………………………………………………………………………. [1] (b) State the value of the potential difference where the lamp and the resistor have the same resistance. potential difference = ………………….. [1] (c) Another resistor X is made of the