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Cambridge International Examinations Cambridge International Advanced Subsidiary and Advanced Level PHYSICS 9702/32 Paper 3 Advanced Practical Skills 2 May/June…
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Cambridge International Examinations Cambridge International Advanced Subsidiary and Advanced Level PHYSICS 9702/32 Paper 3 Advanced Practical Skills 2 May/June 2016 MARK SCHEME Maximum Mark: 40 Published 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 2016 series for most Cambridge IGCSE®, Cambridge International A and AS Level components and some Cambridge O Level components. ® IGCSE is the registered trademark of Cambridge International Examinations. This document consists of 4 printed pages. © UCLES 2016 [Turn over Page 2 Mark Scheme Syllabus Paper Cambridge International AS/A Level – May/June 2016 9702 32 1 (b) (i) Value for θ in range 20° to 30° to nearest degree, with unit. [1] (iv) Value for T in range 0.50 s to 1.50 s. [1] Evidence of repeat readings. At least two measurements of nT, with n ≥ 3. [1] (d) Six sets of values for θ and T with correct trend scores 4 marks, five sets scores 3 marks etc. No θ values over 90°. [4] Help from Supervisor –1. Range: [1] θ values must include 30° or less and 70° or more. Column headings: [1] Each column heading must contain a quantity and an appropriate unit. The presentation of quantity and unit must conform to accepted scientific convention e.g. θ / °, θ (°) or θ (deg) etc. 1/ tanθ must have no unit. Consistency: [1] All raw values of time must be given to the nearest 0.1 s, or all to the nearest 0.01 s. Significant figures: [1] Every value of 1/ tanθ must be given to 2 or 3 s.f. Calculation: [1] Values of 1/ tanθ calculated correctly to the number of s.f. given by the candidate. (e) (i) Axes: [1] Sensible scales must be used. Awkward scales (e.g. 3:10) are not allowed. 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 three large squares apart. Plotting of points: [1] All observations must be plotted. Diameter of plotted points must be ≤ half a small square (no “blobs”). Plotted points must be accurate to half a small square. Quality: [1] All points in the table (at least 5) must be plotted for this mark to be awarded. All points must be no more than ±0.02 s (in the y (T) direction) 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 plot only if clearly indicated by the candidate. Line must not be kinked or thicker than half a small square. © Cambridge International Examinations 2016 Page 3 Mark Scheme Syllabus Paper Cambridge International AS/A Level – May/June 2016 9702 32 (iii) Gradient: [1] Sign of gradient must match graph drawn. The hypotenuse of the triangle used must be greater than half the length of the drawn line. The method of calculation must be correct. Both read-offs must be accurate to half a small square in both x and y directions. y-intercept: [1] Either: Correct read-off from a point on the line and substituted into y = mx + c. Read-offs must be accurate to half a small square in both x and y directions. Or: Intercept read off directly from the graph (accurate to half a small square). (f) Value of p = candidate's gradient and value of q = candidate's intercept. [1] Do not allow fractions. Correct units for p and q (both should have the unit s). [1] 2 (a) (i) h to nearest mm and in range 2.5 cm to 3.5 cm. [1] (ii) Raw values for d to nearest mm. [1] (b) Absolute uncertainty in d in range 2 mm to 5 mm. If repeated readings have been taken, then the uncertainty can be half the range (but not zero) if the working is clearly shown. Correct method of calculation to obtain percentage uncertainty. [1] (c) (i) Value for t in range 20.0 s to 90.0 s, with unit. [1] Evidence of repeat measurements of t. [1] (ii) Correct calculation of R to the s.f. used by the candidate (must be 2 or more s.f.). [1] (d) (ii) Value for x1 to nearest mm, with unit. [1] (e) Second values of h and d and t. [1] Second values of x1 and x2. [1] Quality: (x2 – x1) greater for shorter t. [1] (f) (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] © Cambridge International Examinations 2016 Page 4 Mark Scheme Syllabus Paper Cambridge International AS/A Level – May/June 2016 9702 32 (g) (i) Limitations [4] (ii) Improvements [4] Do not credit A Two readings are not enough Take more readings and plot “Repeat readings” on its to draw a conclusion graph/ own/few readings/only obtain more k values and one reading/take more compare readings and find average k B Parallax error when Measure on bench between measuring d two set squares/ use (vernier) calipers/ use string to find circumference then calculate d C Bottle distorts when Collect water lost between measuring d/ marks and measure volume d varies along bottle/ base of bottle not flat D Difficult to judge/see/operate Use video with timer in Reaction time stopwatch when water level view/ Light gates reaches mark use frame counting/ use coloured water E Wooden strip moves Use video with scale in view continuously when water is falling on it F Difficult to measure height Use set square on bench/ Only short time to because rule not vertical/rule clamp rule measure x touches strip G Water soaks into wooden Use waterproof strip Use new strip/ strip/ dry the strip water stays on wooden strip H R not constant between lines Move lines closer to top/ have lines closer together © Cambridge International Examinations 2016
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