CCKSS 4E Physics (EOC) Prelim Practical 2022 Paper 3 Practical

Preliminary Examination 2022 Secondary Four Express Physics Paper 3 (6091/3) Date of Examination: 5 August 2022 Duration: 1 h 50 min Chua Chu Kang Secondary School Chua Chu Kang Secondary School Chua Chu Kang Secondary Schoo l Chua Chu Kang Secondary School Chua Chu Kang Secondary School Chua Chu Kang Secondary Schoo l Chua Chu Kang Secondary School Chua Chu Kang Secondary School Chua Chu Kang Secondary Schoo l Chua Chu Kang Secondary School Chua Chu Kang Secondary School Chua Chu Kang Secondary Schoo l Chua Chu Kang Secondary School Chua Chu Kang Secondary School Chua Chu Kang Secondary Schoo l Name: ______________________( ) Class: ____________ READ THESE INSTRUCTIONS FIRST Write your name, index number and class in the spaces provided and on any separate answer paper used. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions. Write your answers in the spaces provided on the question paper. Graph paper is provided in this question paper. Additional sheets of graph paper should only be used if it is necessary to do so. You will be allowed to work with the apparatus for a maximum of 55 minutes for each section. You are expected to record all your observations as soon as they are made. An account of the method of carrying out the experiment is not required. The use of an approved scientific calculator is expected, where appropriate. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Question Marks 1 2 Set by: Mr Neal Cooke 3 Vetted by: Ms Audrey Tan, Mdm Fiona Tay & Mdm Hartati TOTAL This Paper consists of 10 printed pages, including the cover page. 8 20 40 12

2 © CCKSS / SC DEPT 18 6091/Prelim 18/CCKSS [Turn over Section A 1 In this experiment, you will determine the specific latent heat of fusion of ice. You are provided with: • a supply of ice, • a styrofoam cup, • a supply of water at room temperature, • a measuring cylinder, • a plastic spoon, • a thermometer, • a stirrer, • some paper towels, • a retort stand with clamp and boss. (a) (i) Measure 80 cm3 of water from the supply, using the measuring cylinder. This water has a mass mw = 80 g. Pour the water into the styrofoam cup. Measure and record the temperature 1 of the water. 1 = …………………………………………. [1] (ii) Take a spoonful of ice, pour off the excess water and dry the ice with a paper towel. Place the ice into the cup. Stir the mixture and note the temperature when all the ice has melted. Continue adding spoonfuls of dried ice and keep stirring until the temperature of the water after the ice has melted completely is below 15 °C. Record the final temperature 2 of the water. 2 = …………………………………………. [1] (iii) Explain why the ice needs to be dried with a paper towel. ………………………………………………………………………………………………. ……………………………………………………………………………………………..... [1]

3 © CCKSS / SC DEPT 2022 6091/Prelim 2022/CCKSS [Turn over (b) (i) Carefully pour the water from the cup into the empty measuring cylinder. Measure and record the final volume of water. final volume of water = …………………………………………. [1] (ii) Calculate the volume of water produced from the melted ice. volume of water from melted ice = …………………………………………. [1] (iii) A volume of 1.0 cm3 of water has a mass of 1.0 g. Calculate the mass mi of ice that was added to the water. mi = …………………………………………. [1] (c) (i) Calculate the thermal energy Q1 lost by the water, initially at room temperature, using the formula 𝑄1 = 𝑚𝑤𝑐𝑤(𝜃1 − 𝜃2) where cw = 4.2 J / (g °C) and mw = 80 g. Q1 = …………………………………………. [1] (ii) Using your value from (b)(iii), calculate the thermal energy Q2 gained by the water formed from the melted ice. Q2 = …………………………………………. [1]

4 © CCKSS / SC DEPT 2022 6091/Prelim 2022/CCKSS [Turn over (d) Calculate the specific latent heat of fusion L of ice using the formula 𝐿 = (𝑄1 − 𝑄2) 𝑚𝑖 L = ………………………………………… [1] (e) Describe how the temperature of the water is measured accurately when using the thermometer. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. [1] (f) Identify one source of error in the experiment and explain how it affects your results. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. [1] (g) Suggest one improvement to the experiment to improve the accuracy of your answer in part (d). ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. [1] [Total: 12]

5 © CCKSS / SC DEPT 2022 6091/Prelim 2022/CCKSS [Turn over 2 In this experiment, you will determine the mass of a metal disc using the Principle of Moments. You will then plan an experiment to find the mass of a metal disc by a graphical method. You are provided with: • a knife-edge, • a metre rule, • a 100 g mass, • a metal disc. (a) You are now going to use the Principle of Moments to determine the mass m of the metal disc. You should aim to obtain the most accurate value for m. Fig. 2.1 (i) Set up the apparatus as shown in Fig 2.1. Before placing the metal disc and 100 g mass on the metre rule, adjust distance x such that the metre rule rests horizontally on the knife edge. Place the metal disc along the metre rule. Adjust the position of the metal disc and the 100 g mass until the metre rule rests horizontally. Determine the distance q between the centre of the metal disc and the knife-edge and the distance r between the knife-edge and the centre of the 100 g mass. q = ……………………………………….. r = ……………………………………….. [1] (b) Calculate the mass m of the metal disc in grams using the formula 𝑚 = 100𝑟 𝑞 m = ……………………………………….. [1] knife-edge metal disc 100 g mass metre rule bench surface x q r

6 © CCKSS / SC DEPT 2022 6091/Prelim 2022/CCKSS [Turn over (c) The equation in (b) may be written in the form 𝑚𝑞 = 100𝑟 where m is the mass of the metal disc in grams. Plan an experiment, using this equation and a graphical method, to find a value for m. Your plan should include • a description of how you would perform the experiment, • a statement of the graph that you would plot, • an explanation of how m would be found from the graph, • a description of one source of error and how it affects the results. …………………………………………………………………………………………………... …………………………………………………………………………………………………... …………………………………………………………………………………………………... …………………………………………………………………………………………………... …………………………………………………………………………………………………... …………………………………………………………………………………………………... …………………………………………………………………………………………………... …………………………………………………………………………………………………... …………………………………………………………………………………………………... …………………………………………………………………………………………………... …………………………………………………………………………………………………... …………………………………………………………………………………………………... …………………………………………………………………………………………………... …………………………………………………………………………………………………... …………………………………………………………………………………………………... …………………………………………………………………………………………………... …………………………………………………………………………………………………... …………………………………………………………………………………………………... [6] [Total: 8]

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