ACJC 2026 J2 H2 Physics Prelim P4

This document has 19 pages. Any blank pages are indicated. Anglo-Chinese Junior College Physics Preliminary Examination Higher 2 CANDIDATE NAME CLASS CENTRE NUMBER S 3 0 0 4 INDEX NUMBER PHYSICS Paper 4 Practical You must answer on the question paper. 9478/04 6 August 2026 2 hours 30 mins INSTRUCTIONS ● Answer all questions. ● Use a black or dark blue or black pen. on both sides of the paper. You may use an HB pencil for any diagrams or graphs. ● Write your name, form class and index number in the boxes at the top of the page. ● Write your answer to each question in the space provided. ● Do not use an erasable pen. Do not use correction fluid or tape. ● You may use an approved calculator. ● You may use a spreadsheet to process and analyse data. ● Write the details of the shift and laboratory in the boxes provided. ● You will be allowed to work with the apparatus for a maximum of 1 hour 15 minutes for each section. The number of marks for each question or part question is shown in brackets [ ]. Shift Laboratory For Examiner’s Use 1 / 14 2 / 11 3 / 25 Total / 50

2 Anglo-Chinese Junior College 2026 J2 H2 9478 Paper 4 Preliminary Examination For Examiner’s Use

3 [Turn over Anglo-Chinese Junior College 2026 J2 H2 9478 Paper 4 Preliminary Examination For Examiner’s Use Section A 1 This experiment considers the oscillations of a small mass suspended on a V -shaped string at varying angles. (a) Set up the apparatus as shown in Fig. 1.1. θ should be approximately 90°. Fig. 1.1 Measure and record the distance l and θ. l = …………………….……… θ = …………………….……… [1] (b) Displace the bob through a short distance and release it so that it performs oscillations in a vertical plane at right angles to the rule as shown in Fig. 1.2. Fig. 1.2 bench θ l boss clamp stand metre rule string mass

4 Anglo-Chinese Junior College 2026 J2 H2 9478 Paper 4 Preliminary Examination For Examiner’s Use (i) Measure and record the period T of the oscillation. T = …………………….……… [1] (ii) Estimate the percentage uncertainty in T. percentage uncertainty = …………………….……… [1] (c) Vary θ in the range 50° ≤ θ ≤ 150°. Repeat 1(a) and 1(b)(i). Present your results clearly. [5]

5 [Turn over Anglo-Chinese Junior College 2026 J2 H2 9478 Paper 4 Preliminary Examination For Examiner’s Use (d) It is suggested that T and θ are related by the equation: 2 2 4 cos 2Tc g=+ l where c is a constant and g is the gravitational field strength. Plot a suitable graph using a spreadsheet to determine c and g. Sketch the graph in the space below. Write down the equation of the trendline. c = …………………….……… g = …………………….……… [4] (e) Describe one problem in taking the readings. ………………………………………………………………………………………........... ………………………………………………………………………………………........... ………………………………………………………………………………………..…. [1] (f) In the expression in 1(d), c is inversely proportional to g. On the same graph, sketch a second line to represent the results if the same experiment is conducted in another location with a higher gravitational field strength. Label the line X. [1] [Total: 14]

6 Anglo-Chinese Junior College 2026 J2 H2 9478 Paper 4 Preliminary Examination For Examiner’s Use 2 In this experiment, you will investigate an electrical circuit. (a) Set up the circuit shown in Fig. 2.1. Fig. 2.1 Record the voltmeter reading E. E = …………………….……… [1]

7 [Turn over Anglo-Chinese Junior College 2026 J2 H2 9478 Paper 4 Preliminary Examination For Examiner’s Use (b) You have been provided with a metre rule with a wire attached. You have also been provided with two identical resistors, each labelled R. Set up the circuit as shown in Fig. 2.2. Fig. 2.2 F and G are crocodile clips. The distance between F and G is L. Attach F and G to the wire so that L is approximately 30 cm. Close the switch. Record the value of L and the voltmeter reading V. L = …………………….……… V = …………………….……… [1] Open the switch.

8 Anglo-Chinese Junior College 2026 J2 H2 9478 Paper 4 Preliminary Examination For Examiner’s Use (c) Increase L by changing the position of F on the wire. Repeat until you have six sets of values of L and V. Present your results clearly. [3] (d) Comment on the trend of the readings of V with L. ……………………………………………………………………………………………….. …………………………………………………………………………………...……….. [1]

9 [Turn over Anglo-Chinese Junior College 2026 J2 H2 9478 Paper 4 Preliminary Examination For Examiner’s Use (e) The quantities V and L are related by the equation: EV PV QL− =− where P and Q are constants. Plot a suitable graph using a spreadsheet to determine Q P . Sketch the graph in the space below. Write down the equation of the trendline. Q P = …………………….……… [3] (f) Theory suggests that: 2 QE P = Using your answer in 2(e), determine E. E = …………………….……… By comparing values obtained in 2(a), suggest whether the theory is justified. ……………………………………………………………………………………………….. …………………………………………………………………………………….……… [1]

10 Anglo-Chinese Junior College 2026 J2 H2 9478 Paper 4 Preliminary Examination For Examiner’s Use (g) Given that: 2kP R= where k is 20 Ω m–1 and R is the resistance of R. Calculate R. R = …………………….……… [1] [Total: 11]