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GCE MAY 2006 : AS 3B Experimental and Investigative Skills (Session 1)

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Centre Number 71 Candidate Number ADVANCED SUBSIDIARY (AS) General Certificate of Education 2006 assessing Module 3B: Experimental and Investigative Skills Session No. 1 ASY32 Physics Assessment Unit AS 3B [ASY32] TUESDAY 16 MAY TIME 1 hour 15 minutes. INSTRUCTIONS TO CANDIDATES Write your Centre Number and Candidate Number in the spaces provided at the top of this page. Turn to page 3 for further Instructions and Information. For Examiner s use only Question Number 1 2 Total Marks ASY3BS6 2598 Marks BLANK PAGE ASY3BS6 2598 2 [Turn over Instructions to Candidates Answer both the questions in this booklet. Rough work and calculations must also be done in this booklet. Except where instructed, do not describe the apparatus or experimental procedures. The Supervisor will tell you the order in which you are to answer the questions. Not more than 35 minutes are to be spent in answering each question. In Question 1, you must stop using the apparatus after 33 minutes so that it can be re-arranged for the next candidate. At the end of the 35-minute period you will be instructed to move to the area set aside for the next question. At the end of the Test a 5-minute period will be provided for you to complete the calculations, etc., in either of the questions of the Test, but you will not have access to the apparatus during this time. Information for Candidates The total mark for this paper is 45. Quality of written communication will be assessed in Question 2. Question 1 carries 25 marks, and Question 2 carries 20 marks. Figures in brackets printed down the right-hand side of pages indicate the marks awarded to each part question. ASY3BS6 2598 3 [Turn over 1 Introduction In this experiment you will investigate the oscillations of different arrangements of identical springs. Aims The aims of the experiment are (a) to obtain the periods of oscillation of different arrangements of identical springs, (b) to plot a graph from the experimental results and measure the gradient and intercept of the graph, (c) to determine the spring constant (which is the same for all of these springs). Apparatus Fig. 1.1 shows an arrangement of three identical springs, which has already been set up for you. The springs are suspended from a stand. When set up initially, there is a single upper spring, which supports a set of two springs, connected in parallel. These springs are loaded with a mass of 0.20 kg. On the bench are four chains of springs, containing two, three, four and five springs, which you will connect, in turn, between the stand and the parallel combination. single spring parallel combination mass carrier and mass (total mass = 0.20kg) Fig. 1.1 ASY3BS6 2598 4 [Turn over Procedure Examiner Only Marks Remark Pull the suspended mass downwards through a few centimetres and release it. This will set the arrangement into vertical oscillations of small amplitude. Take suitable measurements to allow you to determine the period of these oscillations. Record your results in the second column of Table 1.1. Remember to include a heading for this column. Remove the parallel combination and the suspended mass. Replace the single spring with the chain of two springs, and hang the parallel combination and mass on this chain. Set the arrangement into vertical oscillation and repeat the timing measurements. Record your results in the second line of Table 1.1. Repeat this procedure for the remaining three chains of springs, so that you now have three, four and then five springs in series in the upper part of the arrangement. Record the results in the appropriate lines of Table 1.1. Calculate the period T of the oscillations of each arrangement of springs and record it in the third column of Table 1.1. Results Table 1.1 Number of springs in chain, n T/s T 2/s2 1 2 3 4 5 [7] ASY3BS6 2598 5 [Turn over Analysis Examiner Only Marks Remark Theory shows that the period of oscillation T is related to the number n of springs in the chain by the equation T2 = 4 2 m 2 2 m n+ k k where m is the mass of the load and k is the spring constant. (a) You are to plot a linear graph of T 2 against n on the graph paper of Fig. 1.2. First calculate the values of T 2 from your results and enter them in the right-hand column of Table 1.1. Label the axes of your graph and choose suitable scales. Plot the points and draw the best straight line through them. [5] (b) Use your graph to find the value of the spring constant k. Show your working clearly. Give the value of k, together with its unit. k= ______________________ Unit: ______________________ ASY3BS6 2598 [4] 6 [Turn over Fig. 1.2 ASY3BS6 2598 7 [Turn over (c) (i) Explain how you could use your graph to find the period of oscillation of the parallel combination of springs on its own when this part supports only the 0.20 kg mass. Examiner Only Marks Remark ______________________________________________________ ______________________________________________________ ______________________________________________________ ___________________________________________________ [3] (ii) Hence use your graph to find this period. Period = _________ s [2] (iii) Suggest why it is preferable to determine this period from the graph, rather than by direct timing of the oscillations of the parallel combination of springs. Justify your answer by reference to your result in (c)(ii). ______________________________________________________ ______________________________________________________ ______________________________________________________ ______________________________________________________ ______________________________________________________ ___________________________________________________ [4] ASY3BS6 2598 8 [Turn over Where appropriate, your answer to this question should be in continuous prose. You will be assessed on the quality of your written communication. 2 Examiner Only Marks Remark Planning and design question Introduction In this question you are asked to design an experiment to find, accurately, the focal length of a convex (converging) lens. You will have to consider factors affecting the uncertainty in the readings and in the final value of focal length, and to discuss an appropriate range for the readings to be taken. The focal length has already been measured by an approximate method to be about 200 mm. An illuminated object of height about 30 mm is available. You are reminded of the lens formula 1+1=1 uvf (a) State the quantities you propose to measure in your experiment. Do not give experimental detail; you will be asked this in (b). I plan to measure: __________________________________________ ______________________________________________________ [1] (b) (i) List the additional equipment you will need to carry out your experiment. Draw a labelled sketch showing how the apparatus will be arranged. ______________________________________________________ [3] ASY3BS6 2598 9 [Turn over (ii) Describe, in detail, the method you propose. Examiner Only Marks Remark ______________________________________________________ ______________________________________________________ ______________________________________________________ ______________________________________________________ ______________________________________________________ ___________________________________________________ [3] (iii) It is possible to process the results by a graphical method, or nongraphically. Describe how you would obtain an accurate value of the focal length without drawing a graph. ______________________________________________________ ______________________________________________________ ______________________________________________________ ___________________________________________________ [2] (c) (i) State the two different causes of uncertainty which arise when taking readings in your experiment. 1. ____________________________________________________ ______________________________________________________ 2. ____________________________________________________ ___________________________________________________ [2] ASY3BS6 2598 10 [Turn over (ii) Explain how the uncertainty in your value of the focal length of the lens could be determined from the readings taken. Examiner Only Marks Remark _____________________________________________________ _____________________________________________________ ______________________________________________________ ______________________________________________________ ______________________________________________________ ______________________________________________________ ______________________________________________________ ___________________________________________________ [4] (d) (i) Explain why the lens should not be placed less than 200 mm from the illuminated object. ______________________________________________________ ______________________________________________________ ___________________________________________________ [2] (ii) Explain why it would be bad experimental practice to take readings with the lens more than about 800 mm from the illuminated object. ______________________________________________________ ______________________________________________________ ___________________________________________________ [2] Quality of written communication ASY3BS6 2598 [1] 11 [Turn over S 3/06 2800 302507(172) [Turn over

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Additional Info : Gce Physics May 2006 Assessment Unit AS 3B, Module 3B: Experimental and Investigative Skills (Session 1)
Tags : General Certificate of Education, A Level and AS Level, uk, council for the curriculum examinations and assessment, gce exam papers, gce a level and as level exam papers , gce past questions and answer, gce past question papers, ccea gce past papers, gce ccea past papers

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