CJC J2.H2.PRELIM.2024.P4 - QP

Catholic Junior College JC2 Preliminary Examinations Higher 2 CANDIDATE NAME CLASS 2T INDEX NUMBER PHYSICS 9749/04 Paper 4 Practical 19 August 2024 2 hour 30 minutes Candidates answer on the Question Paper READ THESE INSTRUCTIONS FIRST Write your name and class on all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use an HB or 2B 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 assessment, fasten all your work securely together. The number of marks is given in brackets [ ] at end of each question or part question. This document consists of 18 printed pages and 4 blank pages. Shift Laboratory For Examiner’s Use 1 / 15 2 / 6 3 / 23 4 / 11 Total / 55

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3 [Turn Over 1. In this experiment, you will investigate the current in an electrical circuit. (a) You have been provided with two identical metre rules, A and B. Set up the circuit shown in Fig. 1.1. Fig. 1.1 F, G, H and J are crocodile clips of the connecting leads. (i) Place H approximately half-way along the wire on rule B. The distance between F and H is d, as shown in Fig. 1.1. Place J on the wire on rule A so that the distance between G and J is approximately 60 cm. The distance between G and J is c, as shown in Fig. 1.1. Record d and c. d = ……………………………………………. c = ……………………………………………. [1] (ii) Calculate n, where c dn d  . n = ……………………………………………. A d c rule B F H rule A G J wire tape

4 (iii) Close the switch. Record the ammeter reading I. I = ……………………………………… … [1] (iv) Open the switch. (b) Vary c such that c is greater than d and repeat (a)(iii), keeping d constant throughout. Present your results clearly. [5]

5 [Turn Over (c) It is suggested that I and n are related by the expression  2 ( 1)    nS TnI where S and T are constants. Plot a suitable graph to determine the values of S and T. S = ……………………………………………. T = ……………………………………………. [7]

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7 [Turn Over (d) Theory suggests that S is inversely proportional to d and that T is independent of d. The experiment is repeated using the same equipment but a larger value of d. For this experiment, draw a second line on the graph to show the expected results. Label this line W. [1] [Total: 15]

8 2. In this experiment, you will investigate the extension of a spring. (a) You have been provided with a spring. Measure and record the length x0 of the unstretched spring, as shown in Fig. 2.1. Fig. 2.1 x0 = ……………………………………………. (b) Set up the apparatus as shown in Fig. 2.2. Fig. 2.2 The height h of the rod of the clamp above the bench should be approximately 38 cm. One loop of the spring should be around the rod of the clamp. The other loop of the spring should be around the rod of retort stand B close to the top of the rod of retort stand B and secured using blu-tack. bench 90o x  retort stand A retort stand B boss rod of the clamp spring blu-tack h L

9 [Turn Over (c) Slide the base of retort stand B until the angle between the rod of retort stand B and the stretched spring is 90°. The length of the coiled section of the spring is x. The angle between the rod of retort stand B and the horizontal is . The length between the base of the retort stand B and the spring is L. Measure and record x,  and L. x = …………………………………………….  = ……………………………………………. L = ……………………………………………. [2] (d) Calculate e where e = x – x0. e = ………………………………………… [1] (e) Reduce the height h of the rod of the clamp to approximately 32 cm. Keeping L constant, slide the base of retort stand B until the angle between the rod of retort stand B and the stretched spring is again 90°. Measure and record x and . Calculate e. x = …………………………………………….  = ……………………………………………. e = …………………………………………….

10 (f) Theory suggests that the quantities e and θ are related by the equation tan cos cos   mp mqe L L where m is the mass of retort stand B, p = 0.246 cm2 g-1 and q = 0.369 cm2 g-1. It is also found that the force constant of the spring k is given by the equation  gyk p where g = 9.81 m s-2 and y = 4.2 cm. (i) Calculate k. k = …………………………………. N m -1 [1] (ii) If you were to repeat this experiment with other values of , describe the graph that you would plot to determine k. …………………………………………………………………………………………………….. …………………………………………………………………………………………………….. …………………………………………………………………………………………………….. …………………………………………………………………………………………………. [2] [Total: 6]