ACS BR Sc Physics (2024 Prelims Paper 2 QP + AK)

PRELIMINARY EXAMINATION 2024 SECONDARY 4 EXPRESS SCIENCE (PHYSICS) 5086 PAPER 2 TIME: 1 HOUR 15 MINUTES READ THESE INSTRUCTIONS FIRST Write your name, class and index number at the top of this page. You may use an HB pencil for any diagrams, graphs, tables or rough working. Write in dark blue or black pen. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. Section A Answer all questions. Write your answers in the spaces provided on the question paper. Section B Answer only one question. Write your answers in the spaces provided on the question paper. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. This question paper consists of 17 printed pages. For Examiner’s Use Section A /55 Section B /10 Name: __________________________ Class: ___________ Class Index No: __________

Anglo-Chinese School (Barker Road) Preliminary Examination 2024 2 Secondary 4 Express Science (Physics) 5086 Section A Answer all questions in the spaces provided. 1 Physical quantities, consisting of base and derived quantities, are used in science for measuring the world around us. Complete Table 1.1 to show the type of physical quantity, and its SI unit symbol . The first one has been done for you. Table 1.1 physical quantity type of physical quantity SI unit symbol speed derived m/s time base K volume m3 [2] 2 In Australia, “swinging the billy tea” is a tradition where tea is brewed in a teapot and swung in a circular direction three times before drinking. Fig. 2.1 shows an Australian cowboy carrying this out. Fig. 2.1 Explain why the teapot accelerates continuously even though it is moving at constant speed. ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ………………………………………………………………………………………………………….. [2] teapot

Anglo-Chinese School (Barker Road) Preliminary Examination 2024 3 Secondary 4 Express Science (Physics) 5086 3 Fig. 3.1 shows a space capsule of mass 300 kg, a height of 7 m and base area of 3 m2. The space capsule returns to Earth and experiences the Earth’s gravitational field. Fig. 3.1 (a) State what is meant by a gravitational field. ……………………………………………………………………………………………………….. ………………………………………………………………………………………………….… [1] (b) The space capsule finally lands safely on soft marshy ground. The gravitational field strength is 10 N/kg. Calculate the (i) weight of the space capsule, weight = ………………………. N [1] (ii) pressure the space capsule exerts on the ground. pressure = ………………………. N/m2 [2] (iii) The astronaut has a mass of 100 kg . The area of the sole of each of his boots is 0.015 m2. Explain why the astronaut is likely to sink into the soft marshy ground, but the space capsule is not. ……………………………………………………………………………………………..… ……………………………………………………………………………………………..… …………………………………………………………………………………………… [2] 7 m 3 m2

Anglo-Chinese School (Barker Road) Preliminary Examination 2024 4 Secondary 4 Express Science (Physics) 5086 4 A car is stuck as one of its tyres is trapped in a hole on the ground. The driver attempts to lift the car out of the hole using a long plank and a rock as a pivot as shown in Fig. 4.1. Fig. 4.1 Fig. 4.2 shows the long plank being balanced and is just about to lift the car at a point in time. Fig. 4.2 (a) State the principle of moments. ……………………………………………………………………………………………………….. ………………………………………………………………………………………………….… [1] (b) Calculate the distance d for the driver to just be able to lift up the car with the force applied. The plank has negligible weight. distance d = ……………………. m [2] (c) State and explain one improvement the driver can make to use less force to lift the car. ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… …………………………………………………………………………………………………… [2] plank rock stuck car 1.5 m d m 500 N (force of driver on plank) 8000 N (force of car’s weight on plank) rock plank

Anglo-Chinese School (Barker Road) Preliminary Examination 2024 5 Secondary 4 Express Science (Physics) 5086 5 Fig. 5.1 shows a bodybuilder exercising by doing the one-arm lift exercise routine. This exercise consists of the man lifting a 60 N weight up a height of 0.5 m each time. Fig. 5.1 (a) Calculate the work done in lifting the weight each time. work done = …………………………. J [2] (b) The bodybuilder is able to lift the weight 50 times in five minutes. Calculate the power exerted by the bodybuilder. power = ……………………. W [2] 0.5 m weight weight

Anglo-Chinese School (Barker Road) Preliminary Examination 2024 6 Secondary 4 Express Science (Physics) 5086 6 Two metal containers X and Y are filled with equal masses of the same liquid at a temperature of 80 °C, as shown in Fig. 6.1. container X container Y Fig. 6.1 The containers are identical except that container X has a polished silver surface and container Y has a dull black surface. Both containers are placed on a bench and left to cool to 25°C. (a) (i) State the main process in which thermal energy is transferred from liquid to the surrounding. …………………………………………………………………………………………………... ……………………………………………………………………………………………….. [1] (ii) Explain why thermal energy transfers from liquid to the surrounding. …………………………………………………………………………………………………... ……………………………………………………………………………………………….. [1] polished silver surface dull black surface lid

Anglo-Chinese School (Barker Road) Preliminary Examination 2024 7 Secondary 4 Express Science (Physics) 5086 (b) The temperature of the liquid in each can is measured every minute. The variation of the temperature of the liquid in c ontainer X with time is shown in Fig. 6.2. Fig. 6.2 (i) On Fig. 6.2, sketch the graph obtained for container Y. [1] (ii) Explain your answer to (b)(i). ……………………………………………………………………………………………….. …………………………………………………………………………………………… [2] temperature °C time min 80 - 25 -

Anglo-Chinese School (Barker Road) Preliminary Examination 2024 8 Secondary 4 Express Science (Physics) 5086 7 Four different instruments A, B, C and D produce sound waves in air. The excess pressure of the sound wave above normal atmospheric pressure is measured for each instrument and shown in Fig. 7.1. Fig. 7.1 (a) Determine the frequency of the sound wave produced by instrument A. frequency = ……….………. Hz [1] (b) The speed of sound in air is 300 m/s. Calculate the wavelength of the sound wave produced by instrument A. wavelength = ……….………. m [2] instrument A instrument B instrument C instrument D

Anglo-Chinese School (Barker Road) Preliminary Examination 2024 9 Secondary 4 Express Science (Physics) 5086 (c) Complete the following sentences to desc