2021 H2 Phy Prelim Paper 4 Question Paper (forJCs)

YISHUN INNOVA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CANDIDATE NAME CG INDEX NO PHYSICS Paper 4 Practical Candidates answer on the Question Paper. No Additional Materials are required. 9749/04 26 Aug 2021 2 hours 30 minutes READ THESE INSTRUCTIONS FIRST This document consists of 7 printed pages and 1 blank page. This - Blank Page - This document consists of 17 printed pages and 3 blank pages. ©YIJC [Turn over Write your name and class in the spaces 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, highlighters, glue or correction fluid/tape. 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, where appropriate, in the boxes provided. 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 /16 2 / 6 3 /21 4 /12 Total /55

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1 In this experiment, you will investigate an electrical circuit. You are provided with several groups of resistors connected in parallel. (a) Assemble the circuit as shown in Fig. 1.1 A, B, C, D and E are crocodile clips. Measure and record the length Lo of the resistance wire between the ends of A and B, as shown in Fig. 1.1. Lo = …………………………… [1] (b) (i) Select from the groups of resistors connected in parallel, N=4 and connect it across D and E as shown in Fig.1.1. (ii) Close the switch. Move C along the wire until the voltmeter reading is zero. Measure and record the distance L between A and C when the voltmeter reading is zero, as shown in Fig. 1.1. L = …………………………… [1] Open the switch. ©YIJC [Turn over 3

(c) Select a different group of resistors and repeat (b)(ii) until you have at least six sets of values of N and L. Record your results in a table. Include values of and in your table of results. [6] (d) (i) It is suggested that the quantities L and N are related by the equation where a and b are constants. Plot a suitable graph to determine a and b. Give appropriate units. a = .……………………... b = ………………………. [7] ©YIJC [Turn over 4

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(e) Without taking further readings, sketch a line on your graph grid to show the results you would expect if the experiment was