CJC PRELIM.2026.Paper 4 QP

[Turn over Catholic Junior College JC2 Preliminary Examination s Higher 2 CANDIDATE NAME CLASS 2T PHYSICS 9478/04 Paper 4 Practical August 2026 2 hour 30 minutes You must answer on the question paper. You will need: The materials and apparatus listed in the confidential instructions INSTRUCTIONS • Answer all questions. • Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs. • Write your name and index number in the boxes at the top of the page. • Write your answers to each question in the space provided. • Do not use an erasable pen. Do not use correction fluid or pen. • You may use an approved calculator. • You may use a worksheet 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. INFORMATION • The total marks for this section is 50. • The number of marks for each section or part question is shown in brackets [ ]. This document has 15 printed pages and 1 blank page. Shift Laboratory For Examiner’s Use 1 2 3 Total

2 Section A 1 In this experiment, you will determine the resistivity of a metal. (a) Set up the circuit as shown in Figure 1.1, using the resistor of resistance R = 68 Ω. Figure 1.1 Place the jockey on the wire about half -way along the metre rule. The distance between the end of the wire and the jockey is y, as shown in Figure 1.1. Close the switch. Adjust the position of the jockey until the ammeter reading I is as close as possible to 121 mA. Record R, I and y. R = ………………….………………………….… I = ………………….………………………….… y = ………………………………….………….… [1] Open the switch. A R y wire metre rule connecting lead, soldered to wire jockey

3 [Turn over (b) Vary R and adjust y each time so that I is always as close as possible to 121 mA. Present your results clearly. [3] (c) It is suggested that R and y are related by the expression: R Q R QyF=− I where I is your value from (a) and Q and F are constants. Plot a suitable graph using a spreadsheet to determine values of Q and F. Sketch the graph in the space below. Write down the equation of the trendline. Q = ………………….……………………………. F = ………………………………….……………. [5]

4 (d) The experiment is repeated with the ammeter reading I much higher than 121 mA. Sketch a line on your graph in (c) to show the expected results. Label this line as W. [1] (e) (i) Theory suggests that: 2 4Q d= where d is the diameter of the wire and  is the resistivity of the metal. Suggest whether the value of Q can be zero. ..………………………………………………………………………………………………. ..………………………………………………………………………………………………. …………………………………………………………………………………………….. [1] (ii) Determine a value for .  = ….....……...…………….…………. Ω m [3] [Total: 14]

5 [Turn over 2 In this experiment, you will investigate an oscillating system. Two bobs A and B are supported by strings. The string supporting A has a mark at its midpoint. Set up the apparatus as shown in Figure 2.1. Figure 2.1 (a) (i) The long wooden rod should pass between the stand and the strings. The angle between the long wooden rod and the string supporting A is . Adjust the position of the long wooden rod so that  is approximately 60° and the rod is behind the mark on the string supporting A. The rod should be just touching both strings, with the strings hanging vertically. Measure and record .  = …..…..…………………………..….…....° [1] ≈ 20 cm bob bench string long wooden rod boss clamp stand short wooden rod stand mark on string boss clamp A B ≈ 10 cm 

6 (ii) Pull A and B a short distance away from the long wooden rod. Keep the same separation between A and B. Release A and B at the same time. B first oscillates in phase with A, then out of phase, and then back in phase again. This takes n oscillations of B. Determine n. n = ……………..………………….…………. [2] (iii) Estimate the percentage uncertainty of your value of n. percentage uncertainty = ……………..………………….…………. [1] (b) It is suggested that: tannk = where k is a constant. Calculate k. k = ……………..………………….…………. [2]

7 [Turn over (c) (i) Determine n and k for two more values of . Tabulate your results. [2] (ii) Explain whether your results support the suggestion that n is directly proportional to tan θ. Justify your conclusion by referring to your value in (a)(iii). ...……………………………………………………………………………………………… ..………………………………………………………………………………………………. ..………………………………………………………………………………………………. …………………………………………………………………………………………….. [2] (d) Explain why you would not select a value of  = 90° in (c)(i). ……………………………………………………………………………………………………….. ……………………………………………………………………………………………………….. ……………………………………………………………………………………………………….. ……………………………………………………………………………………………..…….. [1] [Total: 11]

8 Section B 3 A cantilever beam is a beam that is supported at one end only. In this experiment, you will investigate how the following properties affect the behaviour of a cantilever beam: • the length of the beam • the load on the beam • the cross-section of the beam • the stiffness of material from which the beam is made. (a) Set up the metre rule on a flat surface such as a benchtop or a stool, as shown in Figure 3.1. Figure 3.1 The ends of the rule are S and T. Use Blu-Tack to firmly attach a mass m, where m = 100 g, at T. The distance between S and the edge of the surface is h. The distance between the centre of mass m and the edge of the surface is L. (i) Adjust the position of the rule so that S just lifts off the surface. Measure and record h and L. h = ………………….………………………….… L = ………………………………….………….… [1] (ii) Calculate h L . h L = ………………………………….…………. [1] flat surface h mass m metre rule L S T

9 [Turn over (iii) Estimate the percentage uncertainty in your value of h L . percentage uncertainty in h L = ………………………………….…………. [2] (b) Vary m and repeat (a)(i) and (a)(ii). [2]

10 (c) It is suggested that h, L a