ADSS Prelim P3

This question paper consists of 14 printed pages including this cover page. ADMIRALTY SECONDARY SCHOOL SUBJECT : Physics CODE/PAPER : 6091/3 LEVEL/STREAM : Secondary 4 Express DATE : 14 August 2024 DURATION : 1 hour 50 minutes Instructions to candidates: Write your name, index number and class on the cover page. Write in dark blue or black pen. You may use a soft pencil for any diagrams, graphs, tables or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. Answer all questions in the space provided. Candidates are reminded that all quantitative answers should include appropriate units. The use of an approved scientific calculator is expected, where appropriate. The number of marks is given in brackets [ ] at the end of each question or part question. If the degree of accuracy is not specified in the question and if the answer is not exact, give the answer to three significant figures. Give answers in degrees to one decimal place. At the end of the examination, fasten all your work securely together. DO NOT TURN OVER THIS PAPER UNTIL YOU ARE TOLD TO DO SO. PRELIMINARY EXAMINATION 2024 For Examiner’s Use Paper 3 / 40 NAME: NO: CLASS:

2 Section A 1 In this experiment, you will investigate the specific heat capacity of a slotted mass. You have been provided with  a thermometer  a 100 g slotted mass, made of brass, with a length of string attached  a polystyrene foam cup,  a plastic stirrer,  a plastic dropper,  a glass beaker,  a measuring cylinder,  a piece of cloth,  a supply of hot water. (a) (i) Using the measuring cylinder, pour 100.0 cm3 of tap water into the polystyrene foam cup. Set up the apparatus as shown in Fig. 1.1. Fig. 1.1 (ii) Record the temperature 𝜃் of the tap water in the polystyrene foam cup. 𝜃் = ………………………. [1] (iii) A volume of 1.0 cm3 of water has a mass of 1.0 g. Record the mass mw of water in the polystyrene foam cup. mw = ………………………. [1] tap water polystyrene foam cup thermometer

3 (b) (i) Collect approximately 150 cm3 of hot water with the plastic beaker. Gently lower the 100 g slotted mass into the plastic beaker of hot water using the attached string. Let the string rest over the edge of the plastic beaker so that it does not drop into the hot water. (ii) Measure the temperature of the hot water in the plastic beaker and record the highest temperature reached as 𝜃ு. 𝜃ு = ………………………. [1] (iii) Using the attached string, carefully transfer the slotted mass from the hot water to the polystyrene foam cup. Rest the string over the edge of the polystyrene foam cup so that it does not drop into the hot water. (iv) Using the plastic stirrer, stir the water in the polystyrene foam cup slowly. Measure and record the highest temperature 𝜃ி of the water while the slotted mass is still in the polystyrene foam cup. 𝜃ி = ………………………. [1] (c) The specific heat capacity cbrass of brass is given by the equation cbrass= mwcw(θF - θT) mbrass(θH - θF) where the specific heat capacity of water cw is 4.2 J/(g °C). Calculate the specific heat capacity of brass, cbrass. cbrass = ………………………. [2]

4 (d) (i) State two reasons why the calculated value of cbrass is not equal to the actual value of the specific heat capacity of brass. 1 ………………………………………………...……………………… …………………………………………………………..……………… 2………………………………………………………………………… …………………………………………………………………..……… [2] (ii) State and explain two improvements to the experiment to reduce the effect of the reasons cited in part (d)(i). 1 ………………………………………………...……………………… …………………………………………………………..……………… 2………………………………………………………………………… …………………………………………………………………..……… [2]

5 2 In this experiment, you will determine an accurate value for the mass of a 30 cm plastic ruler. You have been provided with  a 30 cm plastic ruler with a mm scale,  a 10 g mass,  a pivot (knife-edge). (a) Fig. 2.1 shows a 30 cm ruler of total length L. Fig. 2.1 At one end of the ruler there is a ‘dead space’ of length d1 before the 0.0 cm mark and at the other end there is a ‘dead space’ of length d2 after the 30.0 cm mark. (i) Place the ruler provided on Fig. 2.2. Fig. 2.2 Align the 0.0 cm mark and edge C of the ruler with the lines in the diagram. Draw a line on Fig. 2.2 to mark the position of end A of the ruler. Using Fig. 2.2, measure d1. d1 = ………………………………..

6 (ii) Using Fig. 2.3, repeat (a)(i) with end B and measure d2. Fig. 2.3 d2 = ……………………………….. (iii) Calculate the total length L of the ruler. L = …………………………….. [2] (b) (i) Place the ruler on the pivot. Move the position of the ruler until it balances horizontally. Record the reading S1 on the ruler at the position of the pivot. S1 = ……………………………….. (ii) Place the 10 g mass so that its outer edge is at the 30.0 cm mark on the ruler. Record the reading S2 on the ruler at the position of the centre of the 10 g mass. S2 = ……………………………….. (iii) With the 10 g mass position in (b)(ii), place the ruler on the pivot and move the position of the ruler until it balances horizontally. The arrangement is shown in Fig. 2.4. Fig. 2.4 Record the reading S3 on the ruler at the pivot. S3 = ………………………………..

7 (iv) Determine the distances x and y shown on Fig. 2.4. x = ……………………………….. y = ……………………………….. [2] (c) Calculate the mass M of the ruler using M =10y x . M = …………………………….. [1] (d) The relationship M =10y x can be investigated using the same apparatus as in Fig. 2.4. Plan an experiment to verify the relationship of the equation. Your plan should include  the quantities that you should keep constant,  a detailed description of how you will perform the experiment,  a suitable table in which to display your measurements and calculated values,  a statement of the graph that you would plot to test the relationship,  a sketch of the graph that you would obtain if the suggested relationship is correct,  an explanation of how you would obtain a value of the mass M of the ruler from your graph. ……………………………………………………………………………………... ……………………………………………………………………………………... ……………………………………………………………………………………... ……………………………………………………………………………………... ……………………………………………………………………………………... ……………………………………………………………………………………... ……………………………………………………………………………………... ……………………………………………………………………………………... ……………………………………………………………………………………... ……………………………………………………………………………………...

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10 Section B 3 In this experiment, you will investigate the