2024 VJC H2 Prelim Practical P4 - final

VICTORIA JUNIOR COLLEGE 2024 JC2 PRELIMINARY EXAMINATION Higher 2 Name : ________________________________ CT group : ________________ PHYSICS Paper 4 Practical Candidates answer on the Question Paper. Additional Materials: As listed in the Confidential Instructions 9749/04 29 August 2024 2 hours 30 minutes READ THESE INSTRUCTIONS FIRST Write your name and Civics Group 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. DO NOT WRITE ON ANY BARCODES. 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. 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 2 3 4 Total This document consists of 18 printed pages.

2 1 In this experiment, you will determine the resistivity of a metal. (a) Set up the circuit as shown in Fig. 1.1, using the resistor of resistance R = 68 Ω. 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 Fig. 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. Fig. 1.1

3 (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 Qy F I where I is your value from (a) and Q and F are constants. Plot a suitable graph to determine values of Q and F. Q = ……………………………….. F = ……………………………….. [8]

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5 (d) Theory suggests that: Modulus of 2 4Q d   where d is the diameter of the wire and is the resistivity of the metal. Determine a value for .  = ……………………….. Ω m [2] [Total: 14]

6 2 In this experiment, you will investigate an oscillating system. Clamp the short wooden rod to a height of about 0.40 m. Using Blu-Tack, suspend two pendulum bobs A and B on the wooden rod so the they are 15 cm apart (using the notch on the short wooden rod as guide) as shown in Fig. 2.1. Adjust the length L of both pendulums so that they are both equal to 30 cm. Using the marker pen provided, make a mark at the midpoint of the pendulum A. L stand clamp boss short wooden rod mark on string string bob bench Blu-Tack Fig. 2.1 A B

7 (a) Clamp the long wooden rod on another stand and set up as shown in Fig. 2.2. The long wooden rod should pass between the stand and the strings. (i) 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 60o and the rod is behind the mark on the string supporting A. The rod should be just touching both strings, with the string hanging vertically. Measure and record .  = ……………………….o [1] (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] bench Fig. 2.2  long wooden rod mark on string  20 cm

8 (b) It is suggested that: tann k  where k is a constant. Calculate k. k = …………………………… [2] (c) Determine n and k for two more values of . Tabulate your results. [2] (d) Explain why you would not select a value of  = 90o in (c). …………………………………………………………………………………………………. …………………………………………………………………………………………………. …………………………………………………………………………………………………. …………………………………………………………………………………………………. …………………………………………………………………………………………….. [1] [Total: 8]

9 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 half-metre rule on the benchtop as shown in Fig. 3.1. The ends of the rule are S and T. Use Blu-Tack to firmly attach a mass m, where m = 50 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] benchtop Fig. 3.1 half-metre rule

10 (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]