2024 JVS Physics Prelim P2

1 JVSS Prelim 2024 4Exp Physics 6091/02 [Turn over JURONGVILLE SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 Secondary 4 Express STUDENT NAME CLASS INDEX NUMBER PHYSICS Paper 2 Theory Candidates answer on the Question Paper. No additional materials are required. 6091/02 12 August 2024 1 hour 45 minutes READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write your Name, Index number and Class in the spaces at the top of this page. Write in dark blue or black ink. You may use an HB soft pencil for any diagrams or graph. Do not use staples, paper clips, glue or correction fluid. Section A: Answer all the questions in the spaces provided. Section B: Answer only one of the two questions from this section. 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 the sound use of Physics than for correct answers. At the end of the examination, fasten all your work securely together. The number of marks is given in the brackets [ ] at the end of each question or part question. For Examiner’s Use Section A / 70 Section B / 10 Total / 80 Setter: Mr Lam Seng Tat This document consists of 18 printed pages.

2 JVSS Prelim 2024 4Exp Physics 6091/02 [Turn over Section A (70 marks) Answer all the questions in this section. 1 A student releases a rubber ball from rest . It hits the ground with a velocity of +6.0 m/s. The acceleration due to gravity is 10.0 m/s2. (a) Calculate the time taken for the ball to hit the ground after the student drops it. time taken = ………………….. [2] (b) The ball bounced immediately without loss of energy. The ball reaches back to its original height before it was caught by the student. On Fig. 1.1, draw the velocity-time graph for the ball. [2] (c) Calculate the height at which the rubber ball was released. height = ………………….. [2] 0 time / s Fig. 1.1 m / s velocity [Total:6]

3 JVSS Prelim 2024 4Exp Physics 6091/02 [Turn over 2 Fig. 2.1 shows a kite flown by a student. The kite has a weight of 5 N and is held in position by a string with tension of 40 N. (a) In the space below, draw a scaled and labelled diagram to determine the resultant force of the weight of the kite and the tension of the string acting on the kite. Determine the force due to the wind acting on the kite to keep the kite in position. [1] magnitude of force due to wind = ………………….. [1] direction of force due to wind = …………………..…….. [1] (b) Calculate the acceleration of the kite if the kite is allowed to fly in the direction of the wind force. Assume the same force due to wind as in (a) and take gravitational field strength to be 10 N/kg. acceleration = …………………….. [2] Fig. 2.1 kite [Total:5] JVS 30 20 °

4 JVSS Prelim 2024 4Exp Physics 6091/02 [Turn over 3 Fig. 3.1 shows a 2 m uniform plank kept in a horizontal position by two supports, A and B. The plank has a weight of 24 N. A 76 N load is placed vertically above support B. (a) Explain why the load does not produce a moment about support B. …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………[1] (b) Calculate the force acting at support A when the load is placed vertically above support B. force at support A = …………………….. [2] (c) Calculate the maximum distance that the load can be moved to the right of support B such that the plank does not lift from support A. distance moved = …………………….. [2] Fig. 3.1 support A support B plank load [Total:5] 1.4 m 0.3 m

5 JVSS Prelim 2024 4Exp Physics 6091/02 [Turn over 4 Fig. 4.1 shows a 29 kg gas cylinder placed on a horizontal floor. The gas cylinder exerts 2.3 kPa on the floor. (a) Define pressure. ……………………………………..…………………………………………………………………….. …………………………………………………………………………………………………………[1] (b) Calculate the base area of the gas cylinder. area = ……………………… [2] (c) Fig. 4.2 shows a manometer used to measure the pressure inside the gas cylinder. Calculate the pressure in the gas cylinder. The atmospheric pressure is 1.0 x 10 5 Pa. The density of mercury is 13 600 kg/m3. pressure in gas cylinder = ……………………… [2] Fig. 4.1 [Total:5] 3.5 cm 5.9 cm mercury reference line Fig. 4.2 connected to gas cylinder open to atmospheric pressure

6 JVSS Prelim 2024 4Exp Physics 6091/02 [Turn over 5 (a) Dust particles in an enclosed container were observed to move faster after some time. Describe how this observation relates to the change in energy and temperature of the gas in the container. …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… ……………………………………..…………………………………………………………………….. …………………………………………………………………………………………………………[2] (b) Explain why an electric heater used to heat air in a room is placed on the floor. …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… ……………………………………..…………………………………………………………………….. …………………………………………………………………………………………………………[2] (c) Fig. 5.1 shows a steel pot used to boil water. The 1.2 kg pot contains 3.0 kg of water at 30 °C room temperature. Steel has a specific heat capacity of 445 J/kg K. Water has a specific heat capacity of 4200 J/kgK and specific latent heat of vaporisation of 2.3 x 106 J/kg. (i) Define specific latent heat of vaporisation. ……………………………………..……………………………………………………………….. ……………………………………………………………………………………………………[1] (ii) A 2000 W induction cooker is used to boil water. The steel pot reaches a temperature of 120 °C while water is boiling at 100 °C. Calculate the time take n to boil 0.5 kg of water. Assume no energy loss to the surroundings. time taken = ……………………… [2] [Total:7] Fig. 5.1

7 JVSS Prelim 2024 4Exp Physics 6091/02 [Turn over 6 Fig. 6.1 shows a boy playing a violin. (a) Explain how sound from the violin is produced and transmitted. …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………[2] (b) Fig. 6.2 shows a representation of a violin note. Sketch on Fig. 6.2 another note twice the pitch and twice the loudness. [2] (c) A violin note with wavelength of 1.2 m and period of 0.002 s is transmitted through a liquid. Calculate the speed of sound in the liquid. speed = ……………………… [2] Fig. 6.1 [Total:6] Fig. 6.2

8 JVSS Prelim 2024 4Exp Physics 6091/02 [Turn over 7 Fig. 7.1 shows a circuit diagram with two fixed res