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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 9702/35 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 9702/35 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 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 35 1 (a) (ii) Value of T in range 0.4 ≤ T ≤ 1.4 s. [1] Evidence of repeats. [1] (b) Six sets of readings of m and t (or T) scores 5 marks, four sets scores 4 marks etc. [5] Help from Supervisor –1. Range of m : ∆m ≥ 0.600 kg [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/T2/ s–2. Do not allow 1/T2(s)2 Consistency: [1] All values of raw t must all be given to the nearest 0.1 s or 0.01 s. Significant figures: [1] Significant figures for every row of values of 1/T2 same as or one greater than t (or T) as recorded in table. Calculation: [1] Values of 1/T2 calculated correctly (c) (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”). 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 s–2 of 1/T2 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 (i.e. circled or labelled) 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 the x and y directions. © Cambridge International Examinations 2013 Page 3 Mark Scheme Syllabus Paper GCE AS/A LEVEL – May/June 2013 9702 35 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. (d) Value of P = candidate’s gradient. Value of Q = candidate’s intercept. [1] Unit for P (kg–1 s–2) correct and consistent with value and Q (s–2) [1] [Total: 20] 2 (a) (i) Value of L in range 8.0 ≤ L ≤ 12.0 cm with consistent unit to the nearest mm. [1] (ii) Absolute uncertainty 1 ≤ ∆L ≤ 3 mm. If repeated readings have been taken, then the uncertainty can be half the range. Correct method of calculation to get percentage uncertainty. [1] (b) (iii) Value of raw N1 an integer. [1] (c) (iii) Value of N2 ≥ N1. [1] Evidence of repeats for N1 or N2 either here or in (b)(iii). [1] (d) Correct calculation of F. [1] (e) Second value of L. [1] Second values of N2 and N1. [1] Second (average) value of N1 first (average) value of N1. [1] (f) (i) Two values of k calculated correctly. [1] (ii) Justification of s.f. in k linked to significant figures in L and (N1 – N2) and m. [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 35 (g) (i) Limitations 4 max. (ii) Improvements 4 max. Do not credit A two readings not enough (to take more readings and plot a repeat draw a conclusion) graph/calculate more k values and readings/few compare readings/only one reading/take more readings and average k B friction at pulley method of reducing friction of pulley with location C wet string added to force/ waterproof/nylon/wire mass of string not accounted for D can only measure to nearest use smaller masses e.g. half newton meter 0.4g / paperclip paperclips, riders, graph paper E change in N are very small reasoned explanation for changing helpers length of wire parallax errors F copper wire is not circular wire shape change liquid/wire flat/straight/exit not parallel to water level [Total: 20] © Cambridge International Examinations 2013
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