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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS GCE Advanced Subsidiary Level and GCE Advanced Level MARK SCHEME for the October/November 2011 question paper…

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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS GCE Advanced Subsidiary Level and GCE Advanced Level MARK SCHEME for the October/November 2011 question paper for the guidance of teachers 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 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 October/November 2011 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 – October/November 2011 9702 33 1 (a) (i) All raw values of d in the range 0.15 mm ≤ d ≤ 0.40 mm to 0.01 mm with unit, or supervisor's value ± 0.10 mm [1] (b) (iii) l and V with unit. Value of l in the range 40.0 cm ≤ l ≤ 60.0 cm. [1] (c) Six sets of readings of l and V scores 5 marks, five sets scores 4 marks etc. Incorrect trend –1. Major help from supervisor –2. Minor help from supervisor –1. [5] Range of l: ∆l ≥ 50 cm. [1] Column headings: [1] Each column heading must contain a quantity and a unit where appropriate. There must be some distinguishing mark between the quantity and the unit, e.g. 1/V / V–1. Accept 1/V (V–1) but do not allow 1/V (V)–1 or 1/l (m). Consistency of presentation of raw readings: [1] All values of raw l must be given to 0.001 m. Significant figures: [1] Significant figures for 1/ V must be to the same as, or one more than, the least number of significant figures used in raw V. Calculation: 1/ V calculated correctly. [1] (d) (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 which is being plotted. Scale markings must be no more than three large squares apart. Plotting of points: [1] All observations in the table must be plotted. Check that the points are correctly plotted. Work to an accuracy of half a small square in both the x and y directions. Do not accept ‘blobs’ (points with diameter greater than half a small square). Quality: [1] All points in the table must be plotted (at least 5) for this mark to be scored. Scatter of points must be less than ± 0.2 m–1 (0.002 cm–1) of 1/l of a straight line. (ii) Line of best fit: [1] Judge by balance of all the points on the grid (at least 5) about the candidate's line. 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. © University of Cambridge International Examinations 2011 Page 3 Mark Scheme: Teachers’ version Syllabus Paper GCE AS/A LEVEL – October/November 2011 9702 33 (d) (iii) Gradient: [1] The hypotenuse of the triangle used 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. The method of calculation must be correct. Intercept: [1] Either: Check correct read-off from a point on the line and substitution into y = mx + c. Read-off must be accurate to half a small square in both x and y directions. Allow ecf of gradient value. Or: Check the read-off of the intercept directly from the graph. (e) (i) M = value of gradient, N = value of y-intercept. [1] (ii) Substitution into equation and answer for ρ in range 2 – 20 × 10–7 Ω m (0.2 × 10–6 – 2 × 10–6 Ω m). [1] [Total: 20] 2 (a) Measurement of all raw w to nearest mm in range 2.0 ≤ w ≤ 3.5 cm. [1] (b) (iii) Value of l in range 25 cm ≤ l ≤ 50 cm with unit. [1] (c) (ii) Correct calculation of d. Write in correct value if incorrect. Unit not needed. [1] (iii) Absolute uncertainty in d in the range 3–15 mm (but if repeated readings have been taken then the absolute uncertainty could be half the range, unless zero). Correct method shown used to find the percentage uncertainty. [1] (d) Value of T in range 0.3 s T 1.5 s. [1] Evidence of repeats. [1] (e) Second value of l. [1] Second value of T. [1] Second value of T first value of T. [1] (f) (i) Two values of k calculated correctly. [1] (ii) Justification of s.f. in k linked to time AND d or l. [1] (iii) Sensible comment relating to the calculated values of k, testing against a criterion specified by the candidate. [1] © University of Cambridge International Examinations 2011 Page 4 Mark Scheme: Teachers’ version Syllabus Paper GCE AS/A LEVEL – October/November 2011 9702 33 (g) (i) Limitations 4 max. (ii) Improvements 4 max. Do not credit A Two readings are not enough Take more readings and plot ‘Few readings’/‘take more (to draw a conclusion) a graph/ readings and calculate calculate more k values (and average k’/‘only one reading’ compare) B Loops not the same size/ Method to ensure loops same Difficult to tie knots ruler(s) not horizontal/ size, e.g. use glue or tape to Use of spirit level/use of secure ends plumbline together/tie around fixed Rubber bands or other points/template/mark string material Use of Blu-Tack String stretching C Difficult to judge end/start/ Use of fiducial marker/pointer Reaction time error centre of swing/difficult to Human reaction judge complete swing Difficult to know when to start/ stop timer D Irregular/uneven/unusual Method of ensuring correct Fans/switch off fans swings/not in same horizontal release, e.g. (two) stop(s) at Amplitude changes plane/centre of bottom rule either end not fixed E Loops slide Method, e.g. glue, tape to ‘Glue’ or ‘tape’ on its own fix loop to rule/ drill hole to attach string/ make grooves to hold string F T or time short/large Improved method of timing, Use of computer uncertainty in T e.g. video and timer/frame-by- Light gates frame/increase d or l, Camera decrease distance between High speed camera loops, correct position of Too fast motion sensor linked to data Time too fast logger Time more swings Time large no. of swings. G Reason for calculation of d Measure d directly/measure w Parallax error inaccurate, e.g. different w/ for both rules/measure and Use of set squares thickness of rule not taken allow for thickness. Vernier callipers into account Just ‘different w’ [Total: 20] © University of Cambridge International Examinations 2011

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