EJC 2023 J2 H2 PRELIM P4

©EJC 2023 9749/04/J2H2Prelim/2023 [Turn over EUNOIA JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATIONS 2023 General Certificate of Education Advanced Level Higher 2 CANDIDATE NAME CIVICS GROUP 2 2 - REGISTRATION NUMBER PHYSICS Paper 4 Practical 9749/04 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, civics group and registration 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 an 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 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. This document consists of 20 printed pages. Shift Laboratory For Examiner’s Use 1 21 2 14 3 9 4 11 Total 55

2 ©EJC 2023 9749/04/J2H2Prelim/2023 1 In this experiment, you will investigate how the motion of a paper strip depends on its dimensions. (a) (i) Cut a strip of paper about 26 cm long from the graph paper (labelled PP1) provided. (ii) Set up the strip of paper as shown in Fig. 1.1. Fig. 1.1 (iii) Measure and record the width w of the paper strip, as shown in Fig. 1.2. Fig. 1.2 w = ………………………….. [1] w 24 cm

3 ©EJC 2023 9749/04/J2H2Prelim/2023 [Turn over (b) (i) Set up the apparatus with the top clip supported on the nail, as shown in Fig. 1.3. front view side view Fig. 1.3 (ii) Twist the wooden rod through an angle of approximately 90° in a horizontal plane and release the rod. Determine the period of oscillation of the wooden rod, T. T = ………………………………………… [2] boss and clamp

4 ©EJC 2023 9749/04/J2H2Prelim/2023 (c) (i) State, with a reason, the largest value of w you would use in this experiment. …………………………………………………………………………………………………… ……………………………………………………………………………………………..… [1] (ii) Vary w and repeat steps (a) and (b). Present your results clearly. [3]

5 ©EJC 2023 9749/04/J2H2Prelim/2023 [Turn over (d) (i) Plot values of T against 1 w on the grid below and draw a best fit straight line. [2] (ii) Identify one point which you have plotted in (d)(i) where the measured period T is the furthest from its expected value according to the best fit straight line. Calculate the difference between the measured value and the expected value of T for this point. difference = ………………………… [1]

6 ©EJC 2023 9749/04/J2H2Prelim/2023 (iii) Based on your plot in (d)(i) and your answer in (d)(ii), comment on whether your results support the following relationship. constantTw= …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… ……………………………………………………………………………………………..… [2] (e) It is further suggested that the period T of the oscillations depends on the thickness c of the paper. (i) You have been provided with three additional strips of paper (labelled PP2, PP3, PP4) with different thicknesses. Make appropriate measurements to investigate the relationship between T and c. Present your results clearly, including relevant data from (c)(ii). [3]

7 ©EJC 2023 9749/04/J2H2Prelim/2023 [Turn over (ii) Plot values of T against c on the grid below and draw a line of best fit. [2] (iii) Comment on the relationship between T and c. ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………………………………………………………………………………………..… [1]

8 ©EJC 2023 9749/04/J2H2Prelim/2023 (f) The behaviour of the oscillating system also depends on the length 𝑙 of the wooden rod. It is suggested that the period T is directly proportional to the square of the length 𝑙2 of the wooden rod. Explain how you would investigate this relationship. Your account should include: • your experimental procedure • control of variables • how you would use your results to verify if the relationship is valid ………………………………………………………………………………………………………… ……………………………………………..………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ……………………………………………..………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ……………………………………………..………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… …………………………………………..…………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… …………………………………………………………………………………………………… [3] [Total: 21]

9 ©EJC 2023 9749/04/J2H2Prelim/2023 [Turn over Question 2 starts on the next page

10 ©EJC 2023 9749/04/J2H2Prelim/2023 2 In this experiment, you will investigate how the current in a circuit changes as the resistance of the circuit is changed. (a) (i) Measure and record the e.m.f. E of the d.c. power supply. E = ………………………….. [1] (ii) Set up the apparatus as shown in Fig. 2.1. Fig. 2.1 (iii) Measure and record the length L of the shorter wire. L = ………………………….. [1] (b) (i) Complete the circuit as shown in Fig. 2.2. Fig. 2.2 Each crocodile clip should be attached to a wire at the same distance x from the end of the wire, as shown in Fig. 2.2. metre ruler half-metre ruler tape