Bedok South 2024 Sec 4EXP PHY PRELIMS P2

[Turn Over BEDOK SOUTH SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 4EXP CANDIDATE NAME CLASS REGISTER NUMBER PHYSICS Paper 2 Structured and Free Response Candidates answer on the Question Paper. No Additional Materials are required. 6091/02 22 August 2024 1 hour 45 minutes READ THESE INSTRUCTIONS FIRST Write your class, index number and name on the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, glue or correction fluid. 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. 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. Setter: Ms Toh QM For Examiner’s Use Marks 80 This document consists of 24 printed pages.

2 Section A Answer all the questions. 1 Fig.1.1 shows a tube full of mercury placed upside down in a dish of mercury. A small piece of glass closes the open end of the tube. The piece of glass is removed and the level of mercury in the inverted tube falls, as shown in Fig. 1.2. (a) (i) Explain why the level of mercury in the tube falls. ………...…………………………………..………………………………………. ………...…………………………………..………………………………………. ………...…………………………………..………………………………………. ………...……………………………………………..………………………….[2] (ii) State what is found at point X in Fig. 1.2. ………...……………………………………………..………………………….[1]

3 [Turn Over (b) Describe how the tube of mercury in Fig. 1.2 is used to determine a value for the atmospheric pressure in pascals (Pa). You may draw on Fig. 1.2 to aid in your description. ………...…………………………………..………………………………………......… ………...…………………………………..………………………………………......… ………...…………………………………..………………………………………......… ………...……………………………………………..……………………………......[2] [Total: 5]

4 2 Fig. 2.1 shows a young boy lying on his back on the bottom of a swimming pool. He is holding his breath and his eyes are open. A red light is positioned on the ground at Q. At first the boy’s head is touching the pool wall. He notices that, as he slides away from the pool wall, his eye reaches a point P where he first sees the light at Q. Fig. 2.1 (a) On Fig. 2.1, draw the ray of light travelling from Q to P. Mark the critical angle for light in water and label it C. [2] (b) Explain why the boy is unable to see the red light at Q when his eye is closer to the pool wal