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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 9702/33 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 33 1 (a) (ii) Value of h0 in range 0.70 m h0 0.50 m. Consistent with unit. [1] (b) (iii) Value of h, less than h0 in (a)(ii), with unit. [1] (c) Five sets of readings of h and m scores 5 marks, four sets scores 4 marks etc. Major help from Supervisor –2 (setting up apparatus). Minor help from Supervisor –1. [5] Range of m: [1] To include 0.350 kg. Column headings: [1] Each column heading must contain a quantity and a unit. The unit must conform to accepted scientific convention e.g. m / kg, m(kg) or m in kg, (h0 – h)/m / m kg–1, 1/m / kg–1 Consistency: [1] All values of h must be given to the nearest mm. Significant figures: [1] Significant figures for every row of values of 1/m same as or one greater than m as recorded in the table. Calculation: [1] Values of (h0 – h) /m 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 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] All points in the table must be plotted (at least 4) for this mark to be awarded. Scatter of points must be less than 0.5 kg–1 (0.0005 g–1) of 1/m of a straight line. (ii) Line of best fit: [1] Judge by balance of all points on the grid about the candidate’s line (at least 4 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 33 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 the intercept directly from the graph. (e) Value of P = candidate’s gradient. Value of Q = candidate’s intercept. [1] Unit for P (e.g. m) consistent with value, and Q (m kg–1) [1] [Total: 20] 2 (b) (ii) Value of θ0 to the nearest degree or 0.5° in range 70° # θ # 80° [1] (iii) Value of θ with unit, θ θ0 [1] (iv) Correct calculation of (θ0 – θ) [1] (c) (i) Value of raw d with unit to nearest mm. [1] (ii) Absolute uncertainty in 2 mm d 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) Second value of θ0 within 1 ºC of first value of θ0. [1] Second value of θ. [1] Second value of ∆θ first value of ∆θ (check second value of d first value of d). [1] Evidence of repeat readings of d here or in (c)(i). [1] (e) (i) Two values of k calculated correctly. [1] (ii) Justification of s.f. in k linked to significant figures in d and ∆θ. [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 33 (f) (i) Limitations 4 max. (ii) Improvements 4 max. No credit/not enough A two results not enough take more readings and plot a ‘repeat readings’ on its own/ graph/ few readings/ calculate more k values and take more readings and compare (calculate) average k/ only one reading B heat lost through sides and /or method to reduce heat loss/ use of lid/ bottom lag/ heat loss in warming bowl/cup/ insulate/ draughts/ polystyrene container heat loss to surroundings C temperature change is small/ time for longer/ ∆θ values too close higher starting temperature/ greater range of surface areas D large (percentage) uncertainty use thermometer with greater use more accurate in ∆θ sensitivity or precision/ thermometer/ use thermometer that can read thermometer not precise to 0.1 ºC enough/ not just ‘digital thermometer’ E water in bowl barely covers use larger volume of water/ not just ‘digital thermometer’ (bulb of) thermometer use of thermocouple/ any reference to stirrer/ other small temperature sensor non-uniform temperature/ (e.g. probe) thermometer touching base F parallax error in measuring d / use dividers/calipers string measurements to reason for difficulty in access measure d in measuring d G difficult to mark level with method of making mark stay reason e.g. depth gauge/ calibrated marks/ marker on outside Do not allow: use of coloured ink/reaction time/fans/draughts/water left behind/beakers not accurate/ helpers. [Total: 20] © University of Cambridge International Examinations 2012

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