2022 VS Phy Prelims P2

Class Register Number Name 6091/02 PHYSICS 22/4P/6091/02 Paper 2 Wednesday 31 August 2022 1 hour 45 minutes VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHO OL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHO OL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHO OL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. INSTRUCTIONS TO CANDIDATES Write your name, class and index number in the spaces at the top of this page. Write in dark blue or black pen. Answer all the questions within 1 hour 45 minutes. You may use a HB pencil for any diagrams or graphs. INFORMATION FOR CANDIDATES This paper consists of 21 printed pages, including the cover page. [Turn over] For Marker’s Use Section A /50 Section B /30 Deduction s. f. Total /80 The number of marks is given in brackets [ ] at the end of each questions or part questions. Candidates are reminded that all quantitative answers should include appropriate units. Candidates are advised to show all their working in a clear and orderly manner. Setters: Pang JH, Nordin Poh, Koh CK

2 © VICTORIA SCHOOL 22/4P/6091/02 Section A Answer all the questions in this section. 1 Limestone is a common type of carbonate sedimentary rock which is the main source of the material lime. Limestone typically has a density of 2.71 g / cm3. (a) (i) Define density. ……………………………………………..…………………………………….…….... ………………….………………………..………..………………………………..... [1] (ii) The sides of a cube of limestone is 0.50 m. Show that the mass of this cube is 340 kg. [1] (b) A 1000 kg forklift as shown in Fig. 1.1 is used to lift a cube of limestone as in (a). The weight of the forklift acts at G 1 and the weight of the cube of limestone acts at G2. Points A and B are the points where the wheels are in contact with the ground. (i) On Fig. 1.2, draw the forces acting on the stationary forklift. [2] G1 A B 1.0 m 0.3 m 0.9 m Fig. 1.1 a cube of limestone, 340 kg G2 Fig. 1.2

3 © VICTORIA SCHOOL 22/4P/6091/02 (ii) Determine the maximum number of identical limestone blocks that can be lifted by the forklift before the wheel at point B loses contact with the ground. The gravitational field strength g = 10 N / kg. number of blocks = ………………………. [2] 2 A student throws a basketball of mass 0.60 kg to another student. The basketball rises from point A to a vertical height of 5.0 m at B, as shown in Fig. 2.1. The effect of air resistance is negligible. (a) Show that the increase in gravitational potential energy of the basketball between A and B is 30 J. [1] (b) At B, the kinetic energy of the basketball is 8.5 J. Determine the kinetic energy of the ball at A. kinetic energy = ……………………. [2] A B 5.0 m Fig. 2.1

4 © VICTORIA SCHOOL 22/4P/6091/02 (c) The student claims that when the basketball was thrown in the air, it was able to reach its maximum height as there is an upwards acceleration of the basketball throughout this part of its motion. Comment, in terms of the forces acting, whether the student’s claim is valid. ………….………………………………………..……………………………………..……. ………….………………………………………..……………………………………..……. ………….………………………………………..……………………………………..……. ……...……………….……………………………..……………………………………... [2] 3 Fig. 3.1 shows a mercury manometer. The left arm of the manometer contains some trapped gas. The density of mercury is 13 600 kg / m3. The gravitational field strength g is 10 N / kg. (a) The atmospheric pressure is 76.0 cm Hg. Determine the pressure in Pascals. pressure = ……………………. Pa [1] (b) (i) Calculate the pressure of the trapped gas. pressure = ……………………. Pa [2] cm Fig. 3.1 trapped gas mercury 10 20 30 40 50 60 70 80 90

5 © VICTORIA SCHOOL 22/4P/6091/02 (ii) A small hole is discovered in the left arm of the manometer such that the trapped gas can escape to the surroundings. In Fig. 3.2 indicate the new mercury levels in both arms of the manometer. [1] (c) A student tilted a barometer as shown in Fig. 3.3 such that the vertical height of the barometer is 70 cm. The student then suggests that the pressure at point Y in the barometer is now 70 cm Hg. The surrounding pressure is 76 cm Hg. Explain whether the student’s reading is correct. ………….………………………………………..……………………………………..……. ………….………………………………………..……………………………………..……. ……...……………….……………………………..……………………………………... [1] Fig. 3.3 70 cm mercury Y hole cm Fig. 3.2 10 20 30 40 50 60 70 80 90

6 © VICTORIA SCHOOL 22/4P/6091/02 4 Fig. 4.1 shows an air-tight beaker completely filled with water. (i) (ii) (a) Describe the motion of the water particles in the beaker. .…….………………………………………..…………………………………………..……. .…….………………………………………..………………………………..….……….. [1] (b) The water in Fig. 4.1 is now heated. Using the kinetic model of matter, explain how the pressure in the beaker is affected. .…….………………………………………..………………………………………..………. .…….………………………………………..………………………………………..………. .…….………………………………………..……………………………………..…..….…. .…….………………………………………..……………………………………..….….. [2] (c) Fig. 4.2 shows the scale on a voltmeter connected to a thermocouple thermometer when the probe is placed in melting ice, steam point and in the water of the beaker respectively. Determine the temperature of the water. temperature = ……………….. [2] Fig. 4.2 thermocouple probe in melting ice thermocouple probe in steam thermocouple probe in water beaker cover water Fig. 4.1

7 © VICTORIA SCHOOL 22/4P/6091/02 5 A stick is held against a rotating toothed wheel, as shown in Fig. 5.1. Fig. 5.1 There are 8 teeth on the wheel and it rotates at a frequency of 2.0 Hz. Every time the stick moves from one tooth to the next it produces a click. (a) State what is meant by a frequency of 2.0 Hz. ……………………………………………...……………………………..………..….…...… ………………………………………………………………………………………….….. [1] (b) Given that the speed of sound in air is 330 m s-1, determine the wavelength of the sound produced. wavelength = …………………. [2] (c) The waveform of the sound produced is shown in Fig. 5.2. If the wheel rotates at half the frequency and produces a sound half as loud, state the change(s) to the waveform in Fig. 5.2. …….………………………………………..…………………………..……….…..…..…..… …….………………………………………..…………………………..………….…......…… ...……………….……………………………..………………………….…..……..…..…. [2] displacement time d -d F