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CAMBRIDGE INTERNATIONAL EXAMINATIONS GCE Advanced Subsidiary Level and GCE Advanced Level MARK SCHEME for the May/June 2013 series 9702 PHYSICS 9702/33 Paper 3…
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CAMBRIDGE INTERNATIONAL EXAMINATIONS GCE Advanced Subsidiary Level and GCE Advanced Level MARK SCHEME for the May/June 2013 series 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 should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2013 series for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level components and some Ordinary Level components. Page 2 Mark Scheme Syllabus Paper GCE AS/A LEVEL – May/June 2013 9702 33 1 (a) (i) Value of raw d in the range 0.15 mm ≤ d ≤ 0.44 mm. [1] (b) (v) Value of l in range 0.1 m l 1 m. Value of V in range 0.1 V ≤ V ≤ 2.0 V. [1] (d) Six sets of readings of l and V scores 5 marks; five sets scores 4 marks etc. [5] Major help from Supervisor –2 (setting up apparatus). Minor help from Supervisor –1. Range of l :∆l ≥ 60 cm. [1] Column headings: [1] Each column heading must contain a quantity and a unit. The presentation of quantity and unit must conform to accepted scientific convention. e.g. 1/l /m–1, V/l / V m–1. Do not allow 1/l (m), V(V) / l (m). Consistency: [1] All values of raw l must be given to the nearest mm. Significant figures: [1] Significant figures for every row of values of 1/l same as or one greater than l as recorded in table. Calculation: [1] Values of V/l calculated correctly (e) (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 should be no more than three large squares apart. Plotting of points: [1] All observations in the table must be plotted. Diameter of points must be ≤ half a small square (no “blobs”). Check that the points are plotted correctly. Work to an accuracy of half a small square. Quality: [1] All points in the table must be plotted (at least 5) for this mark to be awarded. Scatter of points must be less than 0.1 m–1 from a straight line on the 1/l axis. (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 (i.e. circled or labelled) by the candidate. Line must not be kinked or thicker than half a small square. © Cambridge International Examinations 2013 Page 3 Mark Scheme Syllabus Paper GCE AS/A LEVEL – May/June 2013 9702 33 (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 the x and y directions. The method of calculation must be correct. y-intercept: [1] Either: 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: Correct read-off of the intercept directly from the graph. (f) (i) Value of M = candidate’s gradient. Value of N = –(candidate’s intercept). [1] (ii) Answer in range ρ: 2.0 ≤ ρ ≤ 20.0 × 10–7 Ω m. Consistent with units. [1] [Total: 20] 2 (a) (ii) Measurement of raw H in range 10.0 cm H 20.0 cm consistent with unit. [1] (b) (ii) Measurement of raw h1 to nearest mm with unit. [1] (iii) Absolute uncertainty in h1 in the range 2–5 mm. If repeated readings have been taken, then the absolute uncertainty can be half the range. Correct method of calculation to get percentage uncertainty. [1] (c) (iii) Measurement of h2 less than h1. [1] Evidence of repeat readings here or in (e). [1] (d) Correct calculation of F with no units. [1] (e) Second value of h1. [1] Second value of h2. [1] Second value of h2 first value of h2. [1] (f) (i) Two values of k calculated correctly. [1] (ii) Justification of s.f. in k linked to significant figures in h1 and (h1 – h2). [1] (iii) Sensible comment relating to the calculated values of k, testing against a criterion specified by the candidate. [1] © Cambridge International Examinations 2013 Page 4 Mark Scheme Syllabus Paper GCE AS/A LEVEL – May/June 2013 9702 33 (g) (i) Limitations 4 max. (ii) Improvements 4 max. Do not credit A two readings not enough (to take many readings and plot a repeat readings draw a conclusion) graph/calculate more k values /few readings and compare /take more readings and (calculate) average k /only one reading B discontinuous movement at method of providing alignment bottom continuous ramp e.g. tape join /stick /fix C parallax error (or wtte) in h1 or ruler and set square with ruler perpendicular to bench h2 or heights detail e.g. set square from /parallax error in height ruler to track or ball D difficult to measure h1/h2 with measure to top of marble. H reason e.g. cannot see /measure diameter of marble /clear ramps bottom of marble/bottom of and subtract it from height to track not at bottom of top of marble marble/thickness of track not taken into account E difficult to release marble description of mechanical string method without applying a force method of releasing marble /use of helpers e.g. card gate F difficult to measure h2 with method of improved too fast/ball travelling too reason related to time e.g. measurement of h2 e.g. video quick, etc. short time interval/doesn’t with (clamped) rule/multiflash /high speed camera or slow stay still at h2 for long photography with (clamped) motion camera rule/trial and improvement method/position sensore at top of ramp/grid behind runway/scale on runway [Total: 20] © Cambridge International Examinations 2013
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