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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS GCE Advanced Subsidiary Level and GCE Advanced Level MARK SCHEME for the May/June 2012 question paper for the…
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS GCE Advanced Subsidiary Level and GCE Advanced Level MARK SCHEME for the May/June 2012 question paper for the guidance of teachers 9702 PHYSICS 9702/35 Paper 3 (Advanced Practical Skills 1), maximum raw mark 40 This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes must be read in conjunction with the question papers and the report on the examination. ã Cambridge will not enter into discussions or correspondence in connection with these mark schemes. Cambridge is publishing the mark schemes for the May/June 2012 question papers for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses. Page 2 Mark Scheme: Teachers’ version Syllabus Paper GCE AS/A LEVEL – May/June 2012 9702 35 1 (b) (ii) Ammeter reading with unit, in range 1 mA I 1 A. Must see n = 3. [1] (c) Six sets of readings of I and n scores 5 marks, five sets scores 4 marks etc. Incorrect trend then –1. Correct trend is I decreases as n increases. Major help from Supervisor –2. Minor help from Supervisor –1. [5] Range of 6 or 7. [1] Column heading: [1] Each column heading must contain a quantity and a unit where appropriate. The unit must conform to accepted scientific convention e.g. I / A, I (A), I in A, n + 1 /I / A–1. Consistency: [1] All values of I must be given to the nearest 0.1 mA or better. Significant figures: [1] Significant figures for every row of values of (n + 1) / I same as or one greater than s.f. in I, as recorded in the table. Calculation: [1] Values of (n + 1) / I calculated correctly. (d) (i) Axes: [1] Sensible scales must be used, no awkward scales (e.g. 3:10). Scales must be chosen so that the plotted points must occupy at least half the graph grid in both x and y directions. Scales must be labelled with the quantity that is being plotted. Scale markings must be no more than 3 large squares apart. Plotting of points: [1] All observations in the table must be plotted. Diameter of plots must be ≤ half a small square (no ‘blobs’). Work to an accuracy of half a small square. Quality: [1] Judge by scatter of all points about best fit line. All points in the table must be plotted for this mark to be scored. At least 5 plots needed. All points must be within 0.2 of n from a best line. (ii) Line of best fit: [1] Judge by balance of all points on the grid about the candidate’s line (at least 5 points). There must be an even distribution of points either side of the line along the full length. Allow one anomalous point only if clearly indicated by the candidate. Line must not be kinked or thicker than half a small square. (iii) Gradient: [1] The hypotenuse of the triangle must be at least half the length of the drawn line. Both read-offs must be accurate to half a small square in both x and y directions. Do not allow ∆x / ∆y. © University of Cambridge International Examinations 2012 Page 3 Mark Scheme: Teachers’ version Syllabus Paper GCE AS/A LEVEL – May/June 2012 9702 35 y-intercept: [1] Either: Check correct read off from a point on the line and substituted into y = mx + c. Read off must be accurate to half a small square in both x and y directions. Or: Check read-off of intercept directly from the graph. (e) Value of P = candidate’s gradient. Value of Q = candidate’s intercept. [1] Do not allow fractions. (f) Value of V in range 1V ≤ V ≤ 2V. [1] (g) R with appropriate unit Ω or V A–1. Expect 50 Ω or 0.05 V mA–1 or 0.05 kΩ [1] [Total: 20] 2 (b) (ii) Value of x with unit to the nearest mm in range: 40.0 cm ≤ x ≤ 60.0 cm. [1] (c) (ii) Value of x1 with consistent unit. [1] (iii) Correct calculation of d1 with unit. [1] (iv) Absolute uncertainty in d1 in range 2 – 5 mm. [1] If repeated readings have been taken, then the absolute uncertainty can be half the range. Correct method shown to find the percentage uncertainty (d) (ii) Value of x2. [1] (e) (iii) Value of 1 s T 4 s. [1] Evidence of repeats. [1] (f) Second value of T. [1] Second value of T first value of T. [1] (g) (i) Two values of k calculated correctly. [1] (ii) Justification of sf in k linked to significant figures in d and T. [1] (iii) Sensible comment relating to the calculated values of k, testing against a criterion specified by the candidate. [1] © University of Cambridge International Examinations 2012 Page 4 Mark Scheme: Teachers’ version Syllabus Paper GCE AS/A LEVEL – May/June 2012 9702 35 (h) (i) Limitations 4 max. (ii) Improvements 4 max. No credit/not enough A two results not enough take more readings with discs repeat readings of other materials / mass and few readings plot a graph/ calculate more k values and compare B reason why difficult to record/ use a taller /narrower shape measure x2/x1 directly take measurement to each end and average/ hole in middle to see x1/x2/ hang masses with string C difficult to get circular shape/flat use a mould/ use a plane use rubber masses top/ same shape/ surface to press down on two shapes not the same because plasticine of groove in 100 g mass D pivot/100 g mass moved while x2 method of securing 100 g mass fix pivot and ruler being determined to rule/ rubber pivot E oscillation not in one plane only F difficult to determine end/start of use of (fiducial) marker(s)/ use a protractor oscillation/ difficult to turn through video with timer 90° each time [Total: 20] © University of Cambridge International Examinations 2012
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