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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 9702/32 Paper 3 (Advanced Practical Skills 2), 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 32 1 (a) Value of L in range 0.80 m L 0.60 m. Consistent with unit. [1] (b) (iii) Value of h0, less than 50 cm, to the nearest mm. [1] (c) Six sets of readings of d and h scores 5 marks, five sets scores 4 marks etc. Help from Supervisor –1. [5] Range of d: [1] To include 25.0 cm (0.250 m) or more and 10.0 cm (0.100 m) or less Column headings: [1] Each column heading must contain a quantity and a unit The unit must conform to accepted scientific convention e.g. d / m, d(m) or d in m, (h – h0)/m, (L/2 – d)2/m2 Consistency: [1] All values of d and h must be given to the nearest mm. Significant figures: [1] All values of (L/2 – d)2 to 2 or 3 s.f. Calculation: [1] Values of (L/2 – d)2 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 which 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). Plots must be accurate to 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 0.5 cm (0.005 m) of (h – h0) 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 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. © University of Cambridge International Examinations 2012 Page 3 Mark Scheme: Teachers’ version Syllabus Paper GCE AS/A LEVEL – May/June 2012 9702 32 (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. 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 a = candidate’s gradient. Value of b = candidate’s intercept. [1] Unit for a (e.g. m) and b (e.g. m2) consistent with values. [1] [Total: 20] 2 (b) (i) Value of ball diameter or d to the nearest 0.1 mm (or 0.01 mm). [1] Values of ball diameter and d in range 5 mm d 25 mm. [1] (ii) Absolute uncertainty is between 2 mm and 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. (iii) Correct calculation of A with consistent unit. [1] (c) (ii) Value of F, with unit. [1] Evidence of repeat measurements of F here or in (d)(ii). [1] (d) (ii) Second value of d. [1] Second value of A is given to the same number of s.f. (or one more s.f.) than d2. [1] Second value of F. [1] Quality: When d increases (second d value is larger than first d value) F also increases (second F value is larger than first F value) and vice versa. [1] (e) (i) Two values of k calculated correctly. [1] (ii) 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 32 (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 difficult to form a perfect method to make uniform pre-sized spheres/ sphere or disc/diameter of spheres/discs e.g. moulds repeat diameter sphere or disc varied measurement and average C reason for difficulty in method to improve eyes in line measuring d e.g. viewed measurement of d e.g. through ruler/parallax error in travelling microscope d D difficult to pull newton-meter method to ensure force is parallel to ruler/bench parallel to ruler e.g. use a long string/pulley and weights* E difficult to judge reading on method to read force at video to take reading/ newton-meter when detaches detachment e.g. newton digital (electronic) newton with reason e.g. ruler moves meter with a ‘max hold’ meter/ suddenly/without warning (so facility/video and playback or parallax related to newton difficult to read newton-meter freeze frame/ use system of meter/ at the instant the ruler starts pulley and weights or sand to difficult to measure force/ to move)/force drops to zero measure F*/ use force sensor issue of viewing ruler and immediately after detachment and datalogger or computer* meter simultaneously F contact area less than calculated disc area/bulging disc G difficult to zero newton-meter improved method to measure zero error in newton-meter/ when used horizontally F: e.g. use system of pulley just a pulley and weights or sand*/use force sensor with datalogger or computer* Do not allow: reaction time/human error/using vernier caliper/helpers/use of micrometer screw gauge/effect of temperature/change in stickiness of Blu-Tack. *This answer can be credited as D, E or G (but not more than once). [Total: 20] © University of Cambridge International Examinations 2012

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