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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 9702/34 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 9702/34 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 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 34 1 (b) (i) Value of d in the range 0.480 – 0.500 m, with unit. [1] (c) Six sets of readings of d and F scores 6 marks, five sets scores 5 marks etc. [6] Incorrect trend or no d data –1. Minor help from Supervisor –1, major help –2. Range: dmax – dmin ≥ 30 cm. [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/d / m–1. Consistency: [1] All values of d must be given to the nearest mm and all values of F must be given to the nearest 0.1 N. Significant figures: [1] Significant figures for every row of values of 1 / d same as, or one greater than, d as recorded in table. Calculation: [1] Values of 1 / d 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 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 on the grid. Points must be plotted to an accuracy of half a small square. Diameter of plotted points must be ≤ half a small square (no blobs). Quality: [1] All points in the table must be plotted on the grid (at least 5) for this mark to be awarded. Judge by the scatter of all the points about a straight line. Scatter of points must be less than ± 0.001 cm–1 from a straight line in the 1/d direction. (ii) Line of best fit: [1] Judge by balance of all the 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. One anomalous point is allowed only if clearly indicated (i.e. circled or labelled) by the candidate. Line must not be kinked or thicker than half a square. © Cambridge International Examinations 2013 Page 3 Mark Scheme Syllabus Paper GCE AS/A LEVEL – May/June 2013 9702 34 (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: Correct read-off from a point on the line substituted into y = mx + c or an equivalent expression, with read-off accurate to half a small square in both x and y directions. Or: Intercept read directly from the graph, with read-off accurate to half a small square in both x and y directions. (e) Value of a = candidate’s gradient. Value of b = candidate’s intercept. [1] Unit for a correct and consistent with value, e.g. N cm. Unit for b is correct and consistent with value, e.g. N. [1] [Total: 20] 2 (a) (i) All values of D to nearest 0.01 cm or all to nearest 0.001 cm, and in [1] range 3.0 to 5.0 mm. Evidence of repeat readings of D. [1] (ii) Absolute uncertainty in D in range 0.02 to 0.05 cm and correct method of [1] calculation to obtain percentage uncertainty. If repeated readings have been taken, then the absolute uncertainty can be half the range (but not zero if values are equal). (c) (i) l in range 19.0 to 21.0 cm, with unit, to nearest mm. [1] (iii) t in range 2.0 to 10.0 s and value(s) to nearest 0.1s or 0.01s. [1] (iv) Correct calculation of v. [1] (d) Justification for s.f. in v linked to s.f. in D and t. [1] (e) (ii) 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) Sensible comment relating to the calculated values of k, testing against a criterion [1] specified by the candidate. © Cambridge International Examinations 2013 Page 4 Mark Scheme Syllabus Paper GCE AS/A LEVEL – May/June 2013 9702 34 (g) (i) Limitations 4 max. (ii) Improvements 4 max. Do not credit A two readings are not enough (to take more readings and plot a “repeat readings” on draw a conclusion) graph / take more readings and its own / few readings / calculate more k values and only one compare reading / take more readings and (calculate) average k B1 large uncertainty in D because D is measure outside diameter and use micrometer small wall thickness / measure an image showing the cross- section and a scale B2 tube distorts when measuring D use travelling microscope / measure volume and calculate D C tube not straight so difficult to tape to a straight rod / increase use stiffer tube make tube vertical / tube not attached mass straight so difficult to measure length D difficult to judge moment (or use video with timer / view video ‘reaction time’ on its operate stopwatch) when level frame by frame / collect water for own / human error / reaches syringe graduations a timed interval and measure ‘light gates’ on its volume / use light gates and own /slow motion (or timer with practical detail / use high speed) camera different diameter syringe with reason / use position sensor above water surface E difficult to see water level use coloured water (or dye) / use clear syringe / view against black background F clay stretches (or squashes) tube measure length after attaching clay References to parallax error are ignored for this experiment. [Total: 20] © Cambridge International Examinations 2013
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