2024 TKGS Prelim P2

TANJONG KATONG GIRLS’ SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR EXPRESS CANDIDATE NAME CLASS 4 INDEX NUMBER PHYSICS 6091/02 Paper 2 14 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 register number on all the work you hand in. Write in dark blue or black pen. You may use a HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions 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 of 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 Section A Setter : Mr Timothy Yeo Section B Markers : Ms Sultana Rahman, Mr Aloysius Goh, Mr David Chung Total / 80 This document consists of 20 printed pages.

2 Tanjong Katong Girls’ School Sec 4 Preliminary Examination 2024 Section A Answer all questions in this section in the spaces provided. The total mark for this section is 70. 1 A ball is thrown vertically down at a speed of 8.4 m/s from point A which is 5.0 m above the ground. Assuming that air resistance is negligible, the ball hits the ground at a speed of v m/s after t seconds. (a) Sketch the velocity -time graph of the ball from the time it was thrown to when it hit the ground at t seconds. Label all essential points. [2] (b) (i) Assuming acceleration due to gravity is 10 m/s2, express t in terms of v. t = ……………………….[2] velocity / m/s time / s 5.0 m A 8.4 m/s

3 Tanjong Katong Girls’ School Sec 4 Preliminary Examination 2024 (ii) Using your sketch in (a) and expression in b(i), determine the speed, v m/s, which the ball hits the ground. v = ………………………. [2] [Total: 6]

4 Tanjong Katong Girls’ School Sec 4 Preliminary Examination 2024 2 The diagram shows a section of a handrail attached to the ceiling of a train carriage. The handrail is light. A man and a lady hold onto the handles and exert downward forces of 700 N and 500 N respectively. The bar is held securely to the ceiling with supports A and B. The force acting on each support is F1 and F2 respectively. (a) State the principle of moments. ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………[2] (b) (i) Taking moments about A, determine the value of F2. F2 = ………………………. [2] (ii) Hence, find the value of F1. F1 = ………………………. [2] (c) A student boards the train and stands in between the man and lady. As there are only two handles, the student does not have any handle to hold onto. Using your knowledge of stability, suggest one way how the student should stand on the train so that she does not fall over when it comes to a sudden stop at the next station. ………………………………………………………………………………………………[1] [Total: 7]

5 Tanjong Katong Girls’ School Sec 4 Preliminary Examination 2024 3 A ball of mass 0.30 kg is projected horizontally with a speed of 8.0 m/s from the top of a building AD which is 45 m above the level ground DC. It moves in a parabolic path and hits the ground at C. (a) State the principle of conservation of energy. ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………[2] (b) Calculate the energy of the ball at A. energy = ………………………. [2] (c) Describe the energy transfer as the ball moves from A to B. ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………[2] [Total: 6]

6 Tanjong Katong Girls’ School Sec 4 Preliminary Examination 2024 4 The figure shows a heater with two glass bulbs of different surfaces. The heater is switched off at the start. Tap T is opened so that air on both sides of the thermometer have the same pressure. Tap T is then closed and the heater is switched on. (a) On the figure, mark clearly the liquid levels on both sides of the thermometer after the heater has been switched on for a short time. [1] (b) Explain your observation. ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………...………………………………………………………………………………....[3] [Total: 4] heater air liquid glass bulb painted matt black shiny glass bulb T

7 Tanjong Katong Girls’ School Sec 4 Preliminary Examination 2024 5 The diagram, drawn to scale, shows the positions of particles at a particular instant when a longitudinal wave passes through. The dots represent the air particles and the lines represent the original undisturbed positions of the particles. (a) (i) In the boxes provided, write down if the particle at that position is in a region of compression, C, or rarefaction, R. [1] (ii) Mark on the figure the wavelength of the wave and label it as λ. [1] (iii) State the magnitude of the wavelength. ………………………………………………………………………………………..[1] (b) Each particle oscillates 200 times per second about its original position. Calculate the speed of the longitudinal wave. speed = ………………………. [2] [Total: 5]

8 Tanjong Katong Girls’ School Sec 4 Preliminary Examination 2024 6 A page from a student’s notebook is shown. (a) Make corrections to two errors in the student’s notes. 1 ………………………………………………………………………………………….. 2 ………………………………………………………………………………………..[2] (b) Describe the effect of extended gamma ray exposure on human cells. ………………………………………………………………………………………………… …………...………………………………………………………………………………....[1] (c) State the changes, if any, to the speed and frequency of gamma rays when it penetrates the skin. ………………………………………………………………………………………………… …………...………………………………………………………………………………....[2] [Total: 5]

9 Tanjong Katong Girls’ School Sec 4 Preliminary Examination 2024 7 A 1.60 m tall lady stands 0.50 m in front of a mirror to look at herself. (a) Draw one light ray to show how the lady sees through the mirror (i) the top of her head, and (ii) her feet. [3] (b) Indicate on the diagram the minimum length of mirror, 𝑙, needed for the lady to see herself from the top of her head to her feet. [1] (c) State two characteristics of the lady’s image in the mirror. …………...………………………………………………………………………………....[1] [Total: 5]

10 Tanjong Katong Girls’ School Sec 4 Preliminary Examination 2024 8 A circuit is connected