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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Subsidiary Level and Advanced Level * 6 2 1 5 3 5 7 6 1 4 * PHYSICS…

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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Subsidiary Level and Advanced Level * 6 2 1 5 3 5 7 6 1 4 * PHYSICS 9702/35 Paper 3 Advanced Practical Skills 1 May/June 2012 2 hours Candidates answer on the Question Paper. Additional Materials: As listed in the Confidential Instructions. READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer both questions. You will be allowed to work with the apparatus for a maximum of one hour for each question. You are expected to record all your observations as soon as these observations are made, and to plan the presentation of the records so that it is not necessary to make a fair copy of them. You may lose marks if you do not show your working or if you do not use appropriate units. Additional answer paper and graph paper should be used only if it becomes necessary to do so. You are reminded of the need for good English and clear presentation in your answers. 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. For Examiner’s Use 1 2 Total This document consists of 10 printed pages and 2 blank pages. DC (CW/SW) 48458/3 © UCLES 2012 [Turn over 2 BLANK PAGE © UCLES 2012 9702/35/M/J/12 3 You may not need to use all of the materials provided. For Examiner’s Use 1 In this experiment, you will investigate how the current in a circuit depends on the resistance of the circuit. (a) Set up the circuit as shown in Fig. 1.1. The crocodile clip should be positioned so that three of the resistors from the chain are included in the circuit. A crocodile clip chain of resistors Fig. 1.1 All the resistors have the same value of resistance R. (b) (i) Close the switch. (ii) Record the ammeter reading I and the number n of resistors from the chain included in the circuit. I = ..................................................... n = ..................................................... [1] (iii) Open the switch. © UCLES 2012 9702/35/M/J/12 [Turn over 4 (c) By attaching the crocodile clip to different junctions and terminals on the chain of For resistors, repeat (b) until you have six sets of readings of I and n. Examiner’s Use (n + 1) Include values of in your table. I [10] (n + 1) (d) (i) Plot a graph of on the y-axis against n on the x-axis. [3] I (ii) Draw the straight line of best fit. [1] (iii) Determine the gradient and y-intercept of this line. gradient = ..................................................... y-intercept = ..................................................... [2] © UCLES 2012 9702/35/M/J/12 5 For Examiner’s Use © UCLES 2012 9702/35/M/J/12 [Turn over 6 (e) It is suggested that the relationship between I and n is For Examiner’s (n + 1) Use = Pn + Q I where P and Q are constants. Use your answers in (d)(iii) to determine values for P and Q. . P = ..................................................... Q = ..................................................... [1] (f) Disconnect the circuit. Connect the voltmeter across the cell. Measure and record the voltage V across the cell. V = ............................................. V [1] (g) The constant P is related to R and V by 2R P= . V Using your answers in (e) and (f), calculate a value for R. R = ................................................. [1] © UCLES 2012 9702/35/M/J/12 7 You may not need to use all of the materials provided. For Examiner’s Use 2 In this experiment, you will investigate how the rotational motion of an object depends on its mass. (a) Mould the modelling clay into a solid disc that is identical in shape to that of the 100 g slotted mass. You will not need to use all of the modelling clay. The modelling clay should keep this shape throughout the experiment. (b) (i) Place the metre rule on the pivot so that it balances, as shown in Fig. 2.1. x pivot metre rule bench Fig. 2.1 (ii) Record the metre rule reading x at the pivot. x = ................................................. [1] (iii) Remove the metre rule from the pivot and lay it flat on the bench. (c) (i) Place the disc you made in (a) at the 100 cm end of the metre rule as shown in Fig. 2.2. x1 disc Fig. 2.2 (ii) Record the metre rule reading x1 at the centre of the disc. x1 = ................................................. [1] (iii) Calculate the distance d1, where d1 = (x1 – x). d1 = ................................................. [1] © UCLES 2012 9702/35/M/J/12 [Turn over 8 (iv) Estimate the percentage uncertainty in your value of d1. For Examiner’s Use percentage uncertainty = ................................................. [1] (d) (i) With the disc still at x1, carefully place the metre rule so that the pivot is again under your value of x on the metre rule from (b)(ii). Use the 100 g mass to balance the rule, as shown in Fig. 2.3. x2 x x1 100 g mass d2 d1 Fig. 2.3 (ii) Record the metre rule reading x2 at the centre of the 100 g mass. x2 = ................................................. [1] (iii) Calculate the distance d2, where d2 = (x – x2). d2 = ..................................................... (iv) Carefully remove the 100 g mass and disc from the rule. © UCLES 2012 9702/35/M/J/12 9 (e) (i) Place the 100 g mass on the wire hanger and suspend it from the rubber band, as For shown in Fig. 2.4. Examiner’s Use rod of clamp boss rubber band stand wire hanger 100 g mass Fig. 2.4 (ii) Hold the 100 g mass and slowly twist it horizontally through 90°. (iii) Release the 100 g mass and watch its movement. The mass completes one oscillation by moving as shown in Fig. 2.5. top view one complete oscillation Fig. 2.5 The time taken for one complete oscillation is T. By timing several of these complete oscillations, determine an accurate value for T. T = .............................................. s [2] © UCLES 2012 9702/35/M/J/12 [Turn over 10 (f) Repeat (e) using the disc. For Examiner’s Use T = .............................................. s [2] (g) For an oscillating mass it is suggested that the relationship between T and d is k T2= d where k is a constant. (i) Using your data, complete the table in Fig. 2.6 and calculate two values of k. object distance from pivot T/s k disc d1 = ........................... ................................. ................................. 100 g mass d2 = ........................... ................................. ................................. Fig. 2.6 [1] (ii) Justify the number of significant figures that you have given for your values of k. .................................................................................................................................. .................................................................................................................................. .............................................................................................................................. [1] (iii) Explain whether your results in (g)(i) support the suggested relationship. .................................................................................................................................. .................................................................................................................................. .................................................................................................................................. .............................................................................................................................. [1] © UCLES 2012 9702/35/M/J/12 11 (h) (i) Describe four sources of uncertainty or limitations of the procedure for this For experiment. Examiner’s Use 1. ............................................................................................................................... .................................................................................................................................. 2. ............................................................................................................................... .................................................................................................................................. 3. ............................................................................................................................... .................................................................................................................................. 4. ............................................................................................................................... .................................................................................................................................. [4] (ii) Describe four improvements that could be made to this experiment. You may suggest the use of other apparatus or different procedures. 1. ............................................................................................................................... .................................................................................................................................. 2. ............................................................................................................................... .................................................................................................................................. 3. ............................................................................................................................... .................................................................................................................................. 4. ............................................................................................................................... .................................................................................................................................. [4] © UCLES 2012 9702/35/M/J/12 12 BLANK PAGE Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. University of Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge. © UCLES 2012 9702/35/M/J/12

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