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CAMBRIDGE INTERNATIONAL EXAMINATIONS GCE Advanced Subsidiary Level and GCE Advanced Level MARK SCHEME for the October/November 2013 series 9702 PHYSICS 9702/33…
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CAMBRIDGE INTERNATIONAL EXAMINATIONS GCE Advanced Subsidiary Level and GCE Advanced Level MARK SCHEME for the October/November 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 October/November 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 – October/November 2013 9702 33 1 (a) (i) Value for d in the range 0.15 mm ≤ d ≤ 0.25 mm, with unit. [1] (c) (ii) Values of V1 and V2 , and V1 ˃ V2. [1] (d) Six sets of readings of l, V1 and V2 scores 5 marks, five sets scores 4 marks etc. [5] Major help from Supervisor –2. Minor help from Supervisor –1. Range: ∆l ≥ 30 cm. [1] Column headings: [1] Each column heading must contain a quantity and a unit where appropriate. The unit must conform to accepted scientific convention, e.g. l / m or 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 V1/V2 must be the same as, or one more than the least number of significant figures used in V1 and V2. Calculation: [1] Values of V1/V2 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 plotted point 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 on the grid for this mark to be awarded. All points must be within 0.05 (to scale) on the y-axis V1/V2 from 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 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. © Cambridge International Examinations 2013 Page 3 Mark Scheme Syllabus Paper GCE AS/A LEVEL – October/November 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: 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. (f) (i) Value of P = candidate’s gradient. Value of Q = candidate’s intercept. [1] (ii) Value of ρ in range 1.0 – 20.0 × 10–7 Ω m [1] [Total: 20] 2 (b) Value of m to the nearest 1 g or better with consistent unit. [1] (c) (ii) Measurement of raw θ to nearest degree with unit. [1] Evidence of repeat readings for θ. [1] (iii) Percentage uncertainty in θ based on absolute uncertainty of 2 to 5° (or half the range provided this is not zero), and correct method of calculation. [1] (iv) Correct calculation of tan (θ / 2). [1] (d) (i) Second value of m first value of m. [1] (ii) Second value of θ. [1] Quality: second value of θ ˂ first value of θ. [1] (e) Value of θ. [1] (f) (i) Two values of k calculated correctly. [1] (ii) Justification of s.f. in k linked to significant figures in m and θ. [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 – October/November 2013 9702 33 (g) (i) Limitations (4 max) (ii) Improvements (4 max) Do not credit A Two readings not enough (to draw Take more readings and plot a repeat readings / a conclusion graph / take more readings and ‘few readings’ / ‘take calculate more k values and more readings and compare calculate average’ / ‘only one reading’ / ‘repeat readings’ on its own B Difficult to measure θ because Tie thread to centre of bottom of hook of mass (hanger) in the way / rubber band and hang mass thick band from it C Difficult to hold the protractor Improved method to measure θ steady / parallax error reading e.g. project image of stretched angle / protractor rubber band onto a screen / mark on board / measure lengths and calculate θ clamp protractor / take picture or video and measure angle D Rubber band stretches over time Take readings quickly / remove mass from rubber band between readings E Stands moved / rods twist when Method of preventing movement loads attached to rubber band of stands / clamp stands to bench / use nails in board F Difficult to locate centre of band Method of locating and mark centre e.g. measure and mark centre G Change in θ small Larger range of masses [Total: 20] © Cambridge International Examinations 2013
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