RI 2023 Y5 Phy T3 CT Sect B QP

© Raffles Institution 9749 Name: ( ) CT Group: 24S0 RAFFLES INSTITUTION 2023 YEAR 5 TERM 3 COMMON TEST 4 July 2023 H2 PHYSICS RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES Section B INSTRUCTIONS TO CANDIDATES Write your name, index number and CT Group. Write your answers to Section B in the spaces provided on the question paper. You are advised to write all your workings and answers clearly. Marks may be deducted for unclear workings. For Examiner’s Use Section A MCQ / 14 Section B 1 / 10 2 / 10 3 / 11 4 / 13 5 / 9 6 / 7 7 / 11 Deductions Total / 85 This document consists of 19 printed pages.

2 © Raffles Institution 9749 [Turn over Section B (71 marks) 1 The resistance R of a wire is related to its length L and cross-sectional area A by the equation LR Aρ= where ρ is the resistivity of the material that the wire is made of. To determine the resistivity of the material of a wire, a student needs to first determine the resistance of the wire. He sets up an electrical circuit to measure the potential difference V across the wire and the current I through the wire and calculates the resistance R of the wire using VR = I . He also measured the length L and the diameter d of the wire using a meter rule and a micrometer screw gauge, respectively. (a) While measuring the diameter, the student failed to notice that the micrometer screw gauge reading is not zero when it is fully closed. State and explain whether this introduces random error or systematic error to t he measurements of the diameter. [2] (b) The student eventually realised his mistake and accounted for the zero error in his measurements. The average values of all quantities, with their uncertainties, are shown in Fig. 1.1. V / V I / A d / mm L / cm 1.50 0.01± 0.32 0.01± 0.23 0.01± 40.0 0.1± Fig. 1.1 (i) Calculate the value of ρ . ρ = mΩ [3]

3 © Raffles Institution 9749 [Turn over (ii) Calculate the uncertainty in ρ .