AHS 2025 Physics P3 QP

1 Anglican High School Secondary Four Preliminary Examination 2025 S4 12 August 2025 1 hour 50 minutes CLASS CLASS INDEX 4 This document consists of 12 printed pages. Anglican High School 2025_S4_Prelim_PHY_P3 [Turn over

2 Section A 1 In this experiment, you will determine the volume of a straw by two different methods. You are provided with: • two round straws • two set squares • a 30 cm ruler • a 50 cm3 measuring cylinder • a container of water • scissors • paper towels (a) Method 1 Take one straw. Immerse the straw fully in the container of water as shown in Fig. 1.1. Move the straw backwards and forwards in the water several times so that the water enters the straw. Put a finger firmly over one end of the straw and remove the straw from the water. Put the straw above the open end of the measuring cylinder and remove the finger so that the water is transferred into the measuring cylinder. Repeat this process 5 more times for a total of 6 transfers. (i) Measure and record the volume of water VT in the measuring cylinder. VT = ......................................... [1] (ii) Calculate the average volume of water V1 in one straw. V1 = ......................................... [1] Fig. 1.1

3 (b) Method 2 (i) Measure and record the length l of the other straw. l = ......................................... [1] (ii) Cut the straw into 4 pieces that are approximately equal in length. Line up the pieces of straw as shown in Fig. 1.2. Ensure the pieces of straw are touching. Length D is the width of the 4 pieces of straw placed side by side. Measure and record the length D for your 4 pieces of straw. D = ......................................... [1] (iii) Use your answer to (b)(ii) to determine the diameter d of one straw. d = ........................................ [1] Fig. 1.2 D Anglican High School 2025_S4_Prelim_PHY_P3 [Turn over

4 (iv) Some of the apparatus on your bench are used to ensure that your measurement of D is as accurate as possible. Draw a diagram to show how you use the apparatus to make sure your measurement of D is as accurate as possible. Label all the apparatus used. [1] (v) The volume V2 of the straw is given by the equation: Use your answers from (a)(i) and (a)(iii) to calculate V2. V2 = ....................................... [2] (c) Suggest two reasons why the values of V1 and V2 are different. 1 ................................................................................................................................................ ................................................................................................................................................... 2 ................................................................................................................................................ ................................................................................................................................................... [2] [Total: 10] V2 =

5 2 In this experiment you will investigate the oscillation of a mass on a spring. You are provided with: • two stands, bosses and weights • a stopwatch • a rule You are also provided with a spring, a wooden rod and two pieces of adhesive putty assembled as shown in Fig. 2.1. (a) Set up the apparatus as shown in Fig. 2.2. modelling clay modelling clay rod Fig. 2.1 Fig. 2.2 Anglican High School 2025_S4_Prelim_PHY_P3 [Turn over rod bench weights small piece of adhesive putty adhesive putty attached to spring L d small piece of adhesive putty adhesive putty attached to spring spring

6 Adjust the position of the stands so that d is approximately 26 cm. Adjust the position of the small piece of adhesive putty so that it is approximately 3 cm from the lower end of the rod. Press it firmly to the rod to ensure that it does not slip off. Measure and record the distance L from the centre of the spring to the centre of the small piece of adhesive putty. L = ......................................... [1] (b) Explain one difficulty in obtaining an accurate value of L ………………………………………………………………………………………………………. ……………………………………………………………………………………………...……. [1] (c) Describe one way that the apparatus is arranged to reduce the risk of the stands toppling over. ………………………………………………………………………………………………………. ……………………………………………………………………………………………...……. [1] (d) Pull the bottom tip of the rod towards you. Release the rod so that it oscillates freely. Determine accurately the period T of the oscillating rod. T = ……………………………. [2]

7 (e) A student claims that T2 = a 𝐿 𝑑 where a is a constant. Using the same apparatus as in Fig. 2.2, plan experiments to find out if the student’s claim is correct. In your plan, you should • identify the quantities that you should keep constant, • describe how you would perform the experiments, • sketch the graphs that you would obtain if the suggested relationship is correct, • explain how you would obtain the value for a from your graphs, • explain one precaution that you should take to ensure the accuracy of the experiments. ………………………………………………………………………………………………………….…… ………………………………………………………………………………………………………….…… ………………………………………………………………………………………………………….…… …………………………………………………………………………………………………………….… …………………………………………………………………………………………………………….… …………………………………………………………………………………………………………….… …………………………………………………………………………………………………………….… …………………………………………………………………………………………………………….… …………………………………………………………………………………………………………….… …………………………………………………………………………………………………………….… ………………………………………………………………………………………………………….…… ………………………………………………………………………………………………………….…… ………………………………………………………………………………………………………….…… …………………………………………………………………………………………………………….… …………………………………………………………………………………………………………….… ………………………………………………………………………………………………………………. …………………………………………………………………………………………………………….… ………………………………………………………………………………………………………….…… ………………………………………………………………………………………………………….…… ………………………………………………………………………………………………………….…… Anglican High School 2025_S4_Prelim_PHY_P3 [Turn over

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