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GCE MAY 2010 : A2 3, Practical Techniques (Internal Assessment) Session 2-Revised

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Sp N ec e ifi w ca tio n Centre Number 71 Candidate Number ADVANCED General Certificate of Education 2010 Physics Assessment Unit A2 3 AY232 Practical Techniques (Internal Assessment) Session 2 [AY232] THURSDAY 13 MAY, MORNING TIME 1 hour 30 minutes. INSTRUCTIONS TO CANDIDATES Write your Centre Number and Candidate Number in the spaces provided at the top of this page. Turn to page 2 for further Instructions and Information. Marks Question Number Teacher Examiner Mark Check 1 110059 2 3 Total Marks 5524 INSTRUCTIONS TO CANDIDATES Answer all questions in this paper. Rough work and calculations must also be done in this paper. Except where instructed, do not describe the apparatus or the experimental procedures. The Supervisor will tell you the order in which you are to answer the questions. Not more than 30 minutes are to be spent in answering each question. You may be told to start with the experimental tests in Section A, or with the single question in Section B. Section A consists of two experimental tests. A 28-minute period is allocated for you to use the apparatus. Two minutes is allocated to the supervisor to prepare the station for the next candidate. At the end of the 30-minute period you will be instructed to move to the area set aside for your next question. Section B consists of one question in which you will be tested on aspects of planning and design. INFORMATION FOR CANDIDATES The total mark for this paper is 60. All questions carry 20 marks each. Figures in brackets printed down the right-hand side of pages indicate the marks awarded to each part question. You may use an electronic calculator. 5524 2 [Turn over BLANK PAGE 5524 3 [Turn over Section A 1 Teacher Examiner Remark Mark Check In this experiment you will investigate the equilibrium conditions of a suspended metre rule. The aims of this experiment are: to keep the metre rule horizontal by adjusting the position and magnitude of the masses attached to it; to use the results to plot a linear graph; to use this graph to find the value for the mass of the metre rule; and to calculate a value for the density of the wood of the metre rule. Apparatus The apparatus shown in Fig 1.1 has been set up for you. The metre rule is suspended from two identical springs at fixed points P and Q. The mass M, 0.100 kg, is set at the 0.20 m mark on the metre rule. The position of M is not changed throughout the experiment. You are now to attach a 0.200 kg mass to either loop near point Q and adjust its position until the lower metre rule is horizontal. 0.25 m 0.15 m 0.20 m P Q M Fig. 1.1 (a) With M = 0.100 kg, position the 0.200 kg mass on the metre rule, as described, so that the rule is horizontal. (i) Describe how you ensured that the rule was horizontal using only the apparatus with which you have been provided. ____________________________________________________ ____________________________________________________ __________________________________________________ [1] 5524 4 [Turn over (ii) Measure the horizontal distance, s, from the right hand end of the metre rule to the loop holding the 0.200 kg mass. Record your result in Table 1.1. Obtain four further values for s by increasing M each time by 0.050 kg. Record your results, including the one for M = 0.100 kg in Table 1.1. You do not need to take repeat readings. Teacher Examiner Remark Mark Check Table 1.1 M/kg s/m 0.100 0.150 0.200 0.250 0.300 [5] (b) Plot a graph of M (y axis) against s (x axis) on the grid of Fig 1.2 on page 6. Choose a suitable scale starting from zero. Plot the points and draw the best fit line. 5524 5 [4] [[Turn over M/kg 0.6 0.5 0.4 0.3 0.2 0.1 0.0 s/m 0 Fig. 1.2 5524 6 [Turn over The straight line that you have drawn is described by Equation 1.1 Teacher Examiner Remark Mark Check A + 2.2 Equation 1.1 M = ks + 5 where k is a constant and A is the mass of the metre rule in kilograms. (c) (i) How would you determine a value for k from your graph? (You are not required to calculate a value for k.) ____________________________________________________ __________________________________________________ [1] (ii) Use your graph to find a value for A, the mass of the metre rule. Mass = ________________ kg 5524 [3] 7 [[Turn over (d) The density of a material can be calculated using Equation 1.2. Teacher Examiner Remark Mark Check density = mass Equation 1.2 volume (i) The length of the metre rule can be assumed to be exactly 100 cm. Use the vernier callipers provided to take suitable measurements from which you can calculate the density of the wood that the metre rule is made from. Record your measurements including their associated absolute uncertainty in Table 1.2. Do not repeat values. Table 1.2 Measurement Uncertainty Unit [3] (ii) Which of these measurements will contribute most to the overall percentage uncertainty in your measurement of density? Explain your answer. ____________________________________________________ __________________________________________________ [1] (iii) Calculate a value for the density of wood. Density of wood = ________________ kg m 3 5524 8 [2] [Turn over 2 In this experiment you will investigate the period of oscillation of a pendulum. Teacher Examiner Remark Mark Check The aims of the experiment are: to obtain the period of oscillation of a pendulum at different heights above the desk; to plot a graph of your results; and to calculate values for two unknown constants K and M. The apparatus shown in Fig 2.1 has been set up for you. h Desk Fig. 2.1 (a) Measure the height, h, from the desk to the bottom of the pendulum bob. Record this height in Table 2.1 on page 10. Displace the pendulum bob slightly and allow it to oscillate with small amplitude. Take readings to allow you to determine T, the period of the oscillation. Insert any headings needed in the wide column of Table 2.1 and record your measurements. Change the height, h, by pulling the thread through the split cork at the suspension point. Repeat the procedure for four further values of h up to a maximum of 0.50 m. 5524 9 [[Turn over Table 2.1 Teacher Examiner Remark Mark Check h/m T/s [4] Theory The relationship between T and h is given by Equation 2.1 T = 2 M h Equation 2.1 K where M and K are constants. (b) You are to draw a suitable straight line graph which may be used to find the values of M and K. Equation 2.1 has been modified by squaring to give Equation 2.2 2 2 M 4 h Equation 2.2 T =4 K K 2 (i) Compare Equation 2.2 with the equation of a straight line and state the quantities you intend to plot on your graph. Vertical axis ________________ Horizontal axis ________________ [2] (ii) In order to plot this graph, you will need to calculate the values of a further quantity. Head the last column in Table 2.1 appropriately, carry out the calculations and tabulate the results in this column. [2] 5524 10 [Turn over (iii) Label the axes of the graph grid of Fig 2.2 on page 12 consistent with (b)(i) and choose suitable scales. Plot the points and draw the best fit straight line. [5] (iv) 1 se the graph to find the value of K and enter the value U below. Teacher Examiner Remark Mark Check K = ________________ Units of K = ________________ 2 Use Equation 2.1 to calculate a value for M. M = ________________ Units of M = ________________ [4] 5524 1 1 [3] [[Turn over Fig. 2.2 5524 12 [Turn over Section B 3 Teacher Examiner Remark Mark Check In this question you will plan an experiment to investigate the relationship between the resistance of a light dependent resistor, LDR, and the distance between the LDR and a light source. The resistance, R, is related to the distance, d, by Equation 3.1 R = Bd Equation 3.1 where B and are constants. (a) (i) Describe the experiment you would carry out to determine the resistance of the LDR by the ammeter-voltmeter method for distances d of the light source from the LDR. In your answer you should include: n appropriate circuit diagram to measure the resistance a of the LDR using the ammeter voltmeter method a diagram showing how the apparatus is set up hat measurements are taken and the instruments that w ny appropriate calculations that are needed to obtain a a how the reliability of the results will be ensured ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ __________________________________________________ [6] are used to take them value of R 5524 1 3 [[Turn over (ii) Describe the ideal conditions under which the experiment should be carried out. Explain your answer. Teacher Examiner Remark Mark Check ____________________________________________________ __________________________________________________ [2] (b) Take the log10 (logarithm to base 10) of both sides of Equation 3.1 in order to obtain an equation in the form of a straight line graph y = mx + c. ______________________________________________________ [1] (c) (i) A value of B and of are required from the experimental results. Describe how these would be obtained from a straight line graph. Include in your answer what values you are plotting on the y and the x axis of your graph and then how B and are found from the graph. y axis ____________________ x axis ____________________ [2] (ii) How is a value for B found from the graph? ____________________________________________________ __________________________________________________ [2] (iii) How is a value for found from the graph? ____________________________________________________ __________________________________________________ [1] 5524 14 [Turn over (d) When such an experiment is carried out accurately is found to have the value 2. Assume this value of to be correct. (i) Determine the units of the constant B in Equation 3.1. ____________________________________________________ __________________________________________________ [1] (ii) Sketch the graph of R against d that you would expect if Equation 3.1 is correct and has the value 2. Teacher Examiner Remark Mark Check R/ d/m (e) The ammeter and voltmeter that are to be used in the experiment are digital. The ammeter reading before the circuit is turned on is 0.000 A. The voltmeter reads 0.00 V. Describe how you would calculate the absolute uncertainty in the value of the resistance of the LDR at a distance d. ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ ______________________________________________________ [4] 5524 1 5 [1] [[Turn over Permission to reproduce all copyright material has been applied for. In some cases, efforts to contact copyright holders may have been unsuccessful and CCEA will be happy to rectify any omissions of acknowledgement in future if notified. 110059

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Additional Info : Gce Physics May 2010 Assessment Unit A2 3, Practical Techniques (Internal Assessment) Session 2 - Revised
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