Fuchun Prelim P2

CANDIDATE NAME CLASS CENTRE NUMBER S INDEX NUMBER PHYSICS Paper 2 Structured and Free Response 6091/02 26 August 2024 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, class and index number 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, 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 in 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 Paper 1 Paper 2 Section A Paper 2 Section B Total /120 Name of setter: Mrs Koh-Teh Yi Wen This document consists of 20 pages. FUCHUN SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 SECONDARY 4 EXPRESS

2 Section A [70 marks] Answer all questions. 1 Fig. 1.1 below shows a dripping tap and measuring cylinder. All the water droplets have the same volume. The droplets fall from the tap at equal time intervals. Fig. 1.1 (a) Explain how the Fig. 1.1 above shows that the water droplets are accelerating. ………………………………………………………………………………………… ……………………………………………………………………………………… [1] (b) A student uses a stopwatch to measure the time taken for the tap to produce 200 droplets. Fig. 1.2 below shows the time reading on the stopwatch. Fig. 1.2 (i) Determine the time, in seconds, for the tap to produce 200 droplets. time = …………………………….. [1]

3 (ii) Determine the average time interval between each droplet when they are falling. time interval = …………………………….. [1] (iii) If the distance between A and B is 20 cm, calculate the average speed of the water droplets. average speed = …………………………….. [2] [Total: 5] 2 Fig 2.1 shows a car test just before impact. Fig 2.2 shows the car at rest after collision. Fig. 2.1 Fig. 2.2 The car crashes into the wall at a speed of 60 km/h. The total mass of the car and the dummy driver is 1500 kg. (a) Calculate the kinetic energy store of the car just before the impact. kinetic energy = …………………………….. [2]

4 (b) Work is done by a force acting on the car at the point of collision to slow it down. Assuming no energy is lost to the surroundings, calculate the average force acting on the car during the collision. average force = …………………………….. [2] (c) Hence, calculate the time from the point of impact to the point when the car comes to rest. time = …………………………….. [2] (d) Using Newton’s laws of motion, explain why the dummy continues to move forward upon impact. …………………...……….…………………………………………………………... …………………...……….…………………………………………………………... ...……………………………...……….……………………………………………… ………………………………………...……….……………………………...……… …………………………………………………...…………………………………… ……………………………………………………………………………………… [2] [Total: 8]

5 3 Fig. 3.1 shows a U-tube which contains mercury being used as a manometer to measure the pressure from a gas supply in a container. One end of the tube is connected to the gas supply and the other end is open. Fig. 3.1 (a) Describe how the gas molecules create a pressure. ………………………………………………………………………………………… ………………………………………………………………………………………… ……………………………………………………………………………………… [1] (b) Explain why the mercury level moves down on the left side of the manometer when the gas supply is connected. ………………………………………………………………………………………… ……………………………………………………………………………………… [1] (c) Given that the density of mercury is 13 600 kg/m3 and that the atmospheric pressure is 760 mm Hg, calculate the pressure of the gas supply in Pa. pressure = …………………………….. [2]

6 (d) The gas supply is made to cool down to a lower temperature. Describe and explain the effect on the difference in the mercury levels between the left and right side of the manometer. ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ……………………………………………………………………………………… [3] [Total: 7] 4 A casserole is a French term for a deep bowl used for cooking a variety of dishes in the oven. (a) A researcher carries out a series of experiments on different types of materials to select a new material that can be used for the casserole. Table 4.1 shows four possible materials and their properties. Table 4.1 material melting point / C specific heat capacity / J/(kg C) A 2350 900 B 950 480 C 1600 480 D 7800 130 (i) In one of the experiments, a 2 kg sample of material A is heated by an electrical heater of power 450 W. The initial temperature of the sample is 25 C. Calculate the time taken for the temperature of the sample to rise to 100 C. time taken = …………………………….. [2]

7 (ii) Using the data in Table 4.1, suggest which material is the most suitable to be used as material for the casserole. Give two reasons to support your choice. Material: …………… Reason 1: ……………………………………………………………………..… ……………………………………………………………………………………. Reason 2: ……………………………………………………………………….. ………………………………………………………………………………… [2] (b) 1.5 kg of hot water at boiling point is poured into the casserole. 3 380 780 J was supplied to convert all the water into steam at boiling point. Calculate the specific latent heat of vaporisation of water. specific latent heat of vaporisation = …………………………….. [1] (c) The researcher then decides to try to place the casserole in a microwave oven to heat soup, as shown in Fig. 4.2. Microwaves created inside the oven are reflected by the metal walls. Fig. 4.2 The soup is mostly water. Microwaves are completely absorbed by a few centimetres of water. As a result, microwaves do not reach the centre of the soup. The instructions suggest that, after the microwave oven is turned off, the soup is not stirred and is left for some minutes so that the centre becomes hot. casserole soup

8 State the name of and describe each of the two processes by which thermal energy transfers through the soup after the microwave oven is turned off. name of first process ………………………………………………………………... description …...……………………………………………………………………… …………………………………………………………………………………………. …………………………………………………………………………………………. name of second process …………………………………………………………… description …...……………………………………………………………………… …………………………………………………………………………………………. ………………………………………………………………………………...…… [3] [Total: 8] 5 Fig. 5.1 shows a straight dipper vibrating near the water surface of a ripple tank. Water waves forming crests and troughs are observed as a series of wavefronts moving away from the dipper. Fig. 5.1 (a) Explain what is meant by a wavefront. ………………………………………………………………………………………… ……………………………………………………………………………………… [1] (b) Using two dotted lines, draw two consecutive wavefronts in Fig. 5.1 [1]

9 (c) Two students conducting an experiment using the ripple tank to measure the speed of the water waves collected the following readings: Average number of wave crests passing a point in 10 seconds = 5 Average distance between two consecutive wave crests = 8.0 cm Average distance from the crest to the trough of the wave = 4.0 cm (i) Determine the speed of the water wave. speed = ………