2021 JPJC Prelim H2 Physics P4

JURONG PIONEER JUNIOR COLLEGE JC2 Preliminary Examination 2021 PHYSICS 9749/04 Higher 2 19 August 2021 Paper 4 Practical 2 hours 30 minutes Candidates answer on the Question Paper. READ THESE INSTRUCTIONS FIRST Write your name, class and index number on all the work you hand in. 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. Shift Laboratory This document consists of 17 printed pages. Name Class Index Number For Examiner’s Use 1 / 16 2 / 6 3 / 21 4 / 12 Total / 55 Answer all questions. You will be allowed a maximum of one hour to work with the apparatus for Questions 1 and 2, and a maximum of one hour for Question 3. You are advised to spend approximately 30 minutes on Question 4. 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.

2 2021/JPJC/Prelim/9749/04 1 In this experiment, you will investigate the current in an electrical circuit. (a) (i) You have been provided with two metre rules A and B, each with a resistance wire attached. Take measurements to determine the resistance per unit length of each of the wires. The resistance per unit length of the wire attached to rule A is RA. The resistance per unit length of the wire attached to rule B is RB. RA = ........................................ RB = ........................................ [2] (ii) Measure and record the diameter d of the wire attached to rule A. d = ........................................ [1] (iii) Determine the resistivity  of the wire attached to rule A.  = ........................................ [1]

3 2021/JPJC/Prelim/9749/04 (b) Set up the circuit as shown in Fig. 1.1. Fig 1.1 L should be approximately half the length of the rule and x should be greater than L. Close the switch. Measure and record L, x and the ammeter reading I. L = ........................................ x = ........................................ I = ........................................ [2] (c) Vary x and repeat (b), keeping L constant throughout. [3]

4 2021/JPJC/Prelim/9749/04 (d) It is suggested that I and x are related by the expression AB EE R L R xI where E is the electromotive force (e.m.f.) of