Temasek 2024_Prelim_4E_Phy_P3_ANS

No part of the paper is to be reproduced without the approval of the Principal of Temasek Secondary School. Name: _________________________ Index Number: Class: _______ TEMASEK SECONDARY SCHOOL O Level Preliminary Examination 2024 Secondary 4 Express PHYSICS 6091 / 03 Paper 3 Practical 1 hour 50 minutes Additional Material: NIL READ THESE INSTRUCTIONS FIRST Do not open the booklet until you are told to do so. You are required to submit this booklet at the end of the paper. Write your name, index number and class on all the work you hand in. Write in dark blue or black pen. You may use a pencil for any diagrams or graphs. Answer all questions. All of your answers should be written in this Question Paper: scrap paper must not be used. Graph paper is provided in this Question Paper. Additional sheets of graph paper should be used only if it is necessary to do so. You will be allowed to work with the apparatus for a maximum of 55 minutes for each section. You are expected to record all your observations as soon as they are made. An account of the method of carrying out the experiments is not required. The use of an approved scientific calculator is expected, where appropriate. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] as the end of each question or part question. For Official Use 1 2 3 Total Shift Laboratory This document consists of XX printed pages. 40

2 No part of the paper is to be reproduced without the approval of the Principal of Temasek Secondary School. Section A 1 In this experiment, you will investigate an electrical circuit containing a light - emitting diode (LED). You are provided with • a power supply (consists of two 1.5 V batteries with battery holders), • a switch, • a light-emitting diode (LED), • 1500 Ω and 6200 Ω resistors, • a voltmeter, • 6 connecting leads, • a digital micrometer. (a) The LED has two legs, one labelled positive, and the other labelled negative. Measure and record the diameter of any one leg. diameter = …………………………. [1] Record to 2 dp in mm Acceptable range Assemble the circuit shown in Fig. 1.1, where R = 1500 Ω. Fig. 1.1 (b) (i) Connect the voltmeter across junctions Y and Z to measure the potential difference (p.d.) VR across R. Close the switch and record VR. VR = …………………………. [1] 1.20 V (2 dp with correct unit) (ii) Open the switch and disconnect the voltmeter. R

3 No part of the paper is to be reproduced without the approval of the Principal of Temasek Secondary School. Calculate the current 𝐼 in the circuit using the relationship 𝐼 = 𝑉𝑅 𝑅 where R is the resistance of the resistor that is in the circuit. 𝐼 = …………………………. [1] I = 1.20 / 1500 = 8.00 × 10-4 A (correct sf, unit) (iii) Connect the voltmeter across junctions X and Y to measure the