NYJC 2023 H2 Physics 9749 P4 Answer

NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CANDIDATE NAME Solution CLASS TUTOR’S NAME CENTRE NUMBER S INDEX NUMBER PHYSICS 9749/04 Paper 4 Practical 21 August 2023 2 hours 30 minutes Candidates answer on the Question Paper. Additional Materials: As listed in the Confidential Instructions READ THESE INSTRUCTIONS FIRST Write your name, class, tutor’s name, Centre number and index number 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 a HB 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 on 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 / 15 2 / 6 3 / 22 4 / 12 Total / 55 This document consists of 19 printed pages. H

2 NYJC 2023 9749/04/PRELIM/23 1 In this experiment, you will investigate an electrical circuit. (a) Set up the circuit shown in Fig. 1.1, using a 15  resistor as P and a 22  resistor as Q. Fig. 1.1 K and L are crocodile clips. Place L approximately half-way along the wire. The distance between K and L is y as shown in Fig. 1.1. Record P, Q and y. P = Q = y = Close the switch. Record the ammeter reading I. I = [1] Open the switch. P Q 15  22  50.0 cm 85.2 mA Value of I with unit and in the range 0.010 A ⩽ I ⩽ 0.200 A.

3 NYJC 2023 9749/04/PRELIM/23 [Turn over (b) Change one or both of the resistors in P and Q. Record the new values of P and Q. P = Q = Close the switch. Change the position of L on the wire so that the ammeter reading is as close as possible to the value for I in (a). Record y. y = [1] Open the switch.