CJC J2.H2.PRELIM.2024.P4 - Soln w ER

Catholic Junior College JC2 Preliminary Examinations Higher 2 CANDIDATE NAME MARK SCHEME CLASS 2T INDEX NUMBER PHYSICS 9749/04 Paper 4 Practical 19 August 2024 2 hour 30 minutes Candidates answer on the Question Paper READ THESE INSTRUCTIONS FIRST Write your name and class 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 or 2B pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. 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 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 assessment, fasten all your work securely together. The number of marks is given in brackets [ ] at end of each question or part question. This document consists of 23 printed pages and 1 blank page. Shift Laboratory For Examiner’s Use 1 / 15 2 / 6 3 / 23 4 / 11 Total / 55

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3 [Turn Over 1. In this experiment, you will investigate the current in an electrical circuit. (a) You have been provided with two identical metre rules, A and B. Set up the circuit shown in Fig. 1.1. Fig. 1.1 F, G, H and J are crocodile clips of the connecting leads. (i) Place H approximately half-way along the wire on rule B. The distance between F and H is d, as shown in Fig. 1.1. Place J on the wire on rule A so that the distance between G and J is approximately 60 cm. The distance between G and J is c, as shown in Fig. 1.1. Record d and c. d = ……………………………………………. c = ……………………………………………. [1]  Correct value of d in the range 49.5 – 50.4 cm.  Correct value of c in the range 59.5 – 60.4 cm.  Correct precision (d.p.) and units: 1 d.p. in cm or 3 d.p. in m.  Repeated readings not required. Examiners’ Comments:  Majority of the candidates obtained full credit.  Candidates are reminded to pay attention to the appropriate d.p. and units. (ii) Calculate n, where c dn d  . 60.0 50.0 0.20050.0    c dn d n = ……………………………………………. 50.0 cm A d c rule B F H rule A G J wire tape 60.0 cm 0.200

4 (iii) Close the switch. Record the ammeter reading I. I = ……………………………………… … [1] Value of I in the range 75.0 – 175.0 mA with unit.  Correct v