DHS 2023 Prelim Physics (Paper 4)

© DHS 2023 9749/04 [Turn over Name: Centre/Index Number: Class: DUNMAN HIGH SCHOOL Preliminary Examination Year 6 H2 PHYSICS Paper 4 Practical Candidates answer on the Question Paper 9749/04 21 August 2023 2 hours 30 minutes READ THESE INSTRUCTIONS FIRST Write your centre number, index number, name and class at the top of this page. Give details of the practical shift and laboratory where appropriate, in the boxes provided. 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 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. 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 9 2 12 3 22 4 12 Total 55 This document consists of 19 printed pages and 3 blank pages.

2 © DHS 2023 9749/04 1 In this experiment, you will investigate how the power P dissipated in a resistor varies with the resistance R of the resistor. Set up the circuit shown in Fig. 1.1. Use the 10 Ω resistor for the value of resistance R. (a) (i) Close the switch S. (ii) Measure and record the current I. I = ………………………………. [1] (iii) Open the switch. Fig. 1.1 A S 2 V dry cell 47 Ω R

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4 © DHS 2023 9749/04 (b) Use the two 10 Ω and three 100 Ω resistors to obtain the value of the resistance R as shown in the Fig.1.2. For each value of R, repeat (a). Also calculate the power dissipated P where P = I2R. R / Ω I / mA P / W 10 20 33 43 50 60 70 100 [4] (c) Plot a graph of P against R. [3] (d) From your graph, state the value of R when P is a maximum. R = ………………………………. [1] [Total: 9] Fig. 1.2

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6 © DHS 2023 9749/04 2 In this experiment, you will investigate the movement of a chain of paper clips. (a) (i) You have been provided with a chain of paper clips. Measure and record the mass M of the chain. M = ………………………………. [1] (ii) Using your answer in (a)(i), calculate the mass m of one paper clip. m = ………………………………. [1] (iii) Justify the number of significant figures that you have given for your value of m. …………………………………………………………………………………………….. …………………………………………………………………………………………….. ………………………………………………………………………………………….[1] (b) (i) You have been provided with t