2024 FHSS P2 PRELIM QP

Candidate Name: Class: Index No.: FUHUA SECONDARY SCHOOL 4E Secondary Four Express PRELIMINARY EXAMINATION 2024 Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School PHYSICS 6091/02 Paper 2 DATE 21 Aug 2024 TIME 1115 – 1300 DURATION 1 hour 45 minutes READ THESE INSTRUCTIONS FIRST Write your name, class and register number on the question paper and work you submit. Write in dark 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/ tape. Section A Answer all questions. Section B Answer one question. 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. FOR EXAMINER’S USE PARENT’S SIGNATURE Section A Section B Total /70 /10 /80 Setter: Mr Raymond Loh Vetter: Mr Nicholas Liu This document consists of 17 printed pages and 1 blank page, including this page.

2 Section A Answer all questions in this section. 1 Fig. 1.1 shows an aircraft of mass 60 000 kg making its take-off run from rest. The engines produce a constant forward thrust of 145 000 N. Throughout the take -off run, the total resistive force acting on the aircraft can be assumed as being constant at 40 000 N. Fig. 1.1 (a) Calculate the acceleration of the aircraft along the horizontal runway. acceleration = ……………….. [2] (b) Calculate the duration of the take-off run if the aircraft becomes airborne at a speed of 60 m / s. duration = ……………….. [2] (c) Hence, calculate the distance the aircraft was on the runway before it becomes airborne. distance = ……………….. [2] (d) In reality, resistive forces during the take -off run vary. Explain the reason for this variability. ……………………………………………………………………………………….............. ……………………………………………………………………………………….............. ……………………………………………………………………………………….............. ………………………………………………………………………………………......... [1] 145 000 N 40 000 N total resistive force

3 2 Fig. 2.1 shows a student doing a push-up. A total force F acts upwards on his hands. There is also a force R acting upwards on his toes. Fig. 2.1 The mass of the student is 60 kg and the gravitational field strength is 10 N / kg. (a) Calculate the weight W of the student. weight = ……………….. [2] (b) Describe how work is done on his body as it rises from the ground. ………………………………………………………………………………………………… …………………………………………………………………………………………….. [1] (c) At the position shown in Fig. 2.1, the student is stationary. The weight W of the student causes a moment about his toes. Calculate the moment due to his weight about his toes. moment = ……………….. [2] (d) Hence, calculate the magnitude of the forces F and R. F = ……….………….. R = ……………….. [3] (e) State the force that forms a Newton’s Third Law action-reaction pair with F. ………………………………………………………………………………………………… …………………………………………………………………………………………….. [1] R centre of gravity F 0.35 m 0.80 m W

4 3 Fig. 3.1 shows the hydraulic braking system of a bicycle. Fig. 3.1 (a) The cyclist applies a force on the brake lever. This increases the pressure in the oil by 1.2 x 106 Pa. The cross-sectional area of piston R is 5.0 x 10–5 m2. Calculate the force F applied by the brake lever on piston R. force F = ……………….. [2] (b) Explain why the force applied to each of the brake pads is larger than F. ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………………………………………………………………………………………….. [2] (c) Suggest and explain why the hydraulic system does not work properly if the oil contains bubbles of air. ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………………………………………………………………………………………….. [2]

5 4 Before a small inflatable boat is used, air is pumped into its rubber chamber. Fig. 4.1 shows a man using an air pump to inflate the boat. Fig. 4.1 Before the man starts to use the pump, the air in the vertical cylinder of the pump is at atmospheric pressure. (a) Explain, in terms of molecules, how the air inside the cylinder exerts a pressure. ……………………………………………………………………………………….............. ……………………………………………………………………………………….............. ……………………………………………………………………………………….............. ………………………………………………………………………………………......... [2] (b) Once the boat is fully inflated, the valve is shut to seal the air within the rubber chamber, and the air pump is disconnected. As the man sits on the side of the boat, the volume of the rubber chamber decreases, causing the air pressure inside the chamber to rise. The temperature of the air remains constant. Explain, in terms of molecules, why the pressure increases. ……………………………………………………………………………………….............. ……………………………………………………………………………………….............. ……………………………………………………………………………………….............. ………………………………………………………………………………………......... [2]

6 5 Plaque is a thin layer of bacteria on teeth. When it is on the teeth, the surfaces of the teeth are negatively-charged and the plaque is positively-charged as shown in Fig. 5.1. Fig. 5.1 (a) With reference to Fig. 5.1, e xplain why plaque clings on the teeth and is difficult to remove. ………………………..…………………………………………………………………... [1] (b) Fig. 5.2 shows a novel toothbrush designed to clean teeth using electrostatic charge. The handle is connected to the positive terminal of the battery, becoming highly positively charged. The head and bristles of the toothbrush are connected to the negative terminal of the battery, becoming negatively charged. Fig. 5.2 (i) Describe how the teeth becomes positively-charged when the toothbrush is used. ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… …………………………………………………………………………………….. [2] (ii) Explain why the positively charged plaque leaves the surface of the tooth. ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… …………………………………………………………………………………….. [2]

7 (c) It is recommended that the teeth should be brushed for 5 minutes. Calculate the total charge passing through the brush in this duration given that a steady current of 0.15 mA passes. total charge = ……………….. [2] 6 Fig 6.1 shows a circuit with a 4700 Ω resistor connected in series with a light-dependent resistor (LDR), which