2023 RI H2 Physics Prelims P4 Questions

Centre Number Class Index Number Name Class S3016 RAFFLES INSTITUTION 2023 Preliminary Examination PHYSICS Higher 2 Paper 4 Practical Candidates answer on the Question Paper. 9749/04 August 2023 2 hours 30 minutes READ THESE INSTRUCTIONS FIRST Write your index number, name and class in the spaces provided at the top of this page. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. Answer all questions. Write your answers in the spaces provided on the question paper. The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. Give details of the practical shift and laboratory, where appropriate, in the boxes provided. 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. Shift Laboratory For Examiner’s Use 1 / 11 2 / 11 3 / 21 4 / 12 Total / 55 This document consists of 19 printed pages and 3 blank pages.

2 1 In this experiment, you will investigate an electrical circuit. (a) Set up the circuit as shown in Fig. 1.1. Fig. 1.1 H is a crocodile clip that is free to move along the wire. Y is a resistor with resistance R. (b) Adjust length L to approximately 0.10 m. Measure and record L. L = (c) Close the switch. Measure and record the current I and the potential difference V. I = V = [1] A V H metre rule tape tape wire L Y

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4 (d) Repeat (b) and (c) for different values of L by varying the position of H. [4] (e) V and L are related by the expression V R k L=+II where k is a constant. Plot a suitable graph to determine R and k. R = k = [6] [Total: 11]

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6 2 In this experiment, you will investigate the equilibrium of a metre rule. (a) (i) You have been provided with a metre rule with a spring attached, as shown in Fig. 2.1. Fig. 2.1 (ii) The length of the unstretched spring is L0, as shown in Fig. 2.2. Fig. 2.2 Measure and record L0. L0 = [1] (b) Set up the apparatus as shown in Fig. 2.3. Fig. 2.3 The metre rule is placed on top of one of the rods. The distance x between the hole with the string and the centre of the rod is shown in Fig. 2.3. Set x to be about 50 cm and adjust the apparatus until the metre rule is horizontal and the spring is vertical and unstretched. metre rule spring string L0 rod of clamp boss boss rod of clamp bench stands metre rule spring string x

7 ©Raffles Institution 9749/04 [Turn over Without changing the heights of the rods of the clamps, gradually shift one of the retort stands until x is 30 cm. The metre rule will tilt and the spring will stretch as shown in Fig. 2.4. (i) Make the necessary adjustment to the apparatus so that the spring remains vertical. Fig. 2.4 The length of the stretched spring is L1. The angle between the rule and the horizontal is , as shown in Fig. 2.4. Measure and record x and L1 and hence, determine sin. x = L1 = sin = [2] rod of clamp rod of clamp metre rule spring string  L1 x

8 (ii) Decrease distance x and repeat (b)(i). x = L1 = sin = [1] (iii) It is suggested that the relationship between sin and x is given by: 2 1sin ( ) 2P xx =− l where l is the length of the metre rule and P is a constant. Determine the average value of P using your values in (b)(i) and (b)(ii). P = [2]

9 ©Raffles Institution 9749/04 [Turn over (iv) Theory suggests that: mgP k= where k is the spring constant of the spring, g is 9.81 m s−2 and m is the mass of the metre rule with a value of 80 g. Calculate k. k = [2] (c) (i) The experiment is repeated for more values of x. Assuming the relationships in (b)(iii) and (b)(iv) are correct, state the graph that you would plot in order to determine the value of the spring constant k. Explain how k is determined from the graph. [2]

10 (ii) Use the relationship in (b)(iii) to determine the value of x when  = 0. State the significance of this value of x. [1] [Total: 11]