Temasek 2024 Prelim 4E Phy P2 QP Final

No part of the paper is to be reproduced without the approval of the Principal of Temasek Secondary School. Name: _________________________ Index Number: Class: _______ TEMASEK SECONDARY SCHOOL Preliminary Examination 2024 Secondary 4 Express PHYSICS 6091 / 02 Paper 2 Structured and Free Response 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Do not open the booklet until you are told to do so. You are required to submit this booklet at the end of the paper. Write your name, index number and class on all the work you hand in. Write in dark blue or black pen. 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. 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. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] as the end of each question or part question. Take gravitational field strength as 10 N/kg. For official use only: 1 4 7 10 13 16 Total: 2 5 8 11 14 3 6 9 12 15 This document consists of 22 printed pages and 0 blank page.

2 No part of the paper is to be reproduced without the approval of the Principal of Temasek Secondary School. Section A Answer all questions. 1 Car A moves from X to Y in a straight road at a constant acceleration of 2.0 m/s2 from rest. At the same starting time as car A, car B starts to move from Y to X at a speed of 3.0 m/s along the same straight road. Car B maintains the same speed throughout the whole journey. (a) Describe how the speed of car A changes with time as it moves from X to Y. …………………………………..…………………………………………………....[1] (b) In Fig. 1.1, s ketch the velocity -time graphs of car A and car B from t = 0 s to t = 5 s. Label the graph with the appropriate values . Take direction from X to Y as the positive direction. [3] (c) The distance between X and Y is 1000 m. Calculate the time taken for Car A to travel from X to Y. time = ………………………. [2] Fig. 1.1 velocity/m/s t/s 0 5

3 No part of the paper is to be reproduced without the approval of the Principal of Temasek Secondary School. 2 In Fig. 2.1, a giant balloon of weight 400 N is filled with helium. It is being secured to the ground by two identical ropes. Each rope experiences a tension of 500 N and the angle between them is 100°. (a) By drawing a labelled vector diagram, determine the magnitude of the resultant of the two tensions. magnitude = ………………………….. [3] (b) State the action-reaction pair to the weight of the balloon. …………………………………..…………………………………………………....[1] Fig. 2.1 500 N 500 N 100°

4 No part of the paper is to be reproduced without the approval of the Principal of Temasek Secondary School. 3 Fig. 3.1 shows a uniform block of wood of weight 1.8 N being tilted about the edge P by a horizontal force F applied at a position 0.1 m vertically above the table. G is the centre of gravity of the block. (a) State the principle of moments. …………………………………………………………………………………………... …………………………………………………………………………………………... ………………………………………………………………………………………...[1] (b) Calculate the horizontal force F in Fig. 3.1. F = ………………………….. [2] 4 Fig. 4.1 shows a hydraulic device that is used to compress paper in a waste disposal site. A force is exerted on piston A, which causes a force to be exerted on the paper. The hydraulic fluid used is an incompressible liquid. Fig. 3.1 F Fig. 4.1

5 No part of the paper is to be reproduced without the approval of the Principal of Temasek Secondary School. (a) By referring to kinetic particle model of matter , explain why liquids are incompressible. …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... ………………………………………………………………………………………...[2] (b) Calculate the force exerted on piston B, given the values of force and areas in Fig. 4.1. force = ………………………….. [2] (c) Calculate the vertical distance moved by piston B when piston A is pushed downward through a distance of 200 mm. distance = ………………………mm [1]

6 No part of the paper is to be reproduced without the approval of the Principal of Temasek Secondary School. 5 In Fig. 5.1, two mercury-in-glass barometers, M and N, are set-up side by side at sea level using identical glass tubes. There is a vacuum in the space above the mercury column in barometer M whereas barometer N contains trapped air. Take density of mercury to be 13 600 kg/m3 and gravitational field strength g is taken to be 10 N/kg. (a) State the atmospheric pressure measured by barometer M in cmHg. pressure = ………………………….cmHg [1] (b) Calculate the atmospheric pressure measured by barometer M in Pascals. pressure = ………………………….Pa [2] (c) State how your answer to part (b) would change if it was brought to the top of Mount Everest. ………………………………………………………………………………………...[1] (d) Using ideas about molecules, explain how the trapped air in barometer N causes a decrease in the height of the mercury column in N. …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... ………………………………………………………………………………………...[2] Fig. 5.1 M N vacuum trapped air

7 No part of the paper is to be reproduced without the approval of the Principal of Temasek Secondary School. 6 Fig. 6.1 shows a hot water storage tank. Water enters from water inlet X and leaves from water outlet Y. (a) Explain how the heating element is able to heat up the entire water tank. …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... ………………………………………………………………………………………...[3] (b) Describe how the design of the storage tank reduces energy transfer to the surroundings through conduction and radiation. …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... ………………………………………………………………………………………...[2] Fig. 6.1 air

8 No part of the paper is to be reproduced without the approval of the Principal of Temasek Secondary School. 7 Fig. 7.1 shows a gold leaf electroscope which consists of a metal ball connected to a metal stem with a gold leaf attached. The gold leaf hangs straight down when the electroscope is uncharged. When a charged glass rod is brought close to (but not touching) the ball of the electroscope, the leaf is observed to rise. (a) The glass rod becomes positively charged when rubbed with silk. Explain how the rod becomes positively charged. …………………………………………………………………………………………... …………………………………………………………………………………………... ………………………………………………………………………………………...[1] (b) Explain why the gold leaf rises when the rod is brought near to the metal ball. …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... ………………………