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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS GCE Advanced Subsidiary Level and GCE Advanced Level MARK SCHEME for the October/November 2010 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 2010 question paper for the guidance of teachers 9702 PHYSICS 9702/35 Paper 31 (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 CIE will not enter into discussions or correspondence in connection with these mark schemes. CIE is publishing the mark schemes for the October/November 2010 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 2010 9702 35 1 (a) (i) Value of d to the nearest 0.01 mm or 0.001 mm with consistent unit. [1] 0.20 d 0.60 mm. (b) (iii) Value of x in range 40 cm–60 cm with consistent unit. [1] Value of I with units. (c) Six sets of readings of x and I scores 5 marks, five sets scores 4 marks etc. Incorrect trend then –1. Minor help from supervisor –1 ; major help from supervisor –2 [5] Range [1] xmax 70 cm; xmin 30 cm Column headings [1] Each column heading must contain a quantity and a unit. There must be some distinguishing mark between the quantity and the unit (solidus is expected but accept, for example, 1/I (A–1). Do not allow 1/I (A)) Consistency of presentation of raw readings. [1] All values of x must be given to the nearest mm. Significant figures [1] S.F. in 1/I must be the same as, or one more than, the least number of significant figures used in raw I. Calculation [1] Correct calculation of 1/I. © UCLES 2010 Page 3 Mark Scheme: Teachers’ version Syllabus Paper GCE AS/A LEVEL – October/November 2010 9702 35 (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. Ignore units. Scale markings should be no more than three large squares apart. Plotting of points [1] All observations must be plotted on the grid. Do not accept blobs (points with diameter 0.5 small square). Ring and check a suspect plot. Work to an accuracy of half a small square. (ii) Line of best fit [1] Judge by the balance of at least 5 points about the candidate’s line. There must be an even distribution of points either side of the line along the full length. Lines must not be kinked. Do not accept lines thicker than half a small square. Quality [1] All points in the table (minimum 5) must be plotted for this mark to be scored. All points must be within 2 cm (to scale) in x direction of a straight line. (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. 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. Allow ecf of gradient value. Or: Check read-off of intercept directly from graph. M ρ (e) Values obtained in (a)(ii) and (d)(iii) substituted correctly into equation: = [1] N AR Do not allow substitution methods to find M or N Value for ρ in range: 1 × 10–7 Ω m – 5 × 10–6 Ω m with consistent unit. [1] [Total: 20] © UCLES 2010 Page 4 Mark Scheme: Teachers’ version Syllabus Paper GCE AS/A LEVEL – October/November 2010 9702 35 2 (a) (ii) Measurement of x to nearest mm. x 15.0 cm with consistent unit. [1] –1 for supervisor’s help. (b) (iii) Measurement of θ (less than 90°) with unit. [1] (iv) Absolute uncertainty in θ in the range 2°–10°. [1] If repeated readings have been taken, then the uncertainty can be half the range. Correct method of calculation of percentage uncertainty. (v) m = 50 g with consistent unit [1] M = 60 g with consistent unit [1] (vi) Correct calculation of m/M (0.83 or 0.833). No units. [1] (c) Measurement of θ [1] m = 40 g; M = 70 g [1] Quality: θ2 θ1 [1] (d) (i) Correct calculation of two values of k. [1] (ii) Justification of sf in k linked to θ, m and M [1] (iii) Valid conclusion based on the calculated values of k. [1] Candidate must test against a stated criterion. © UCLES 2010 Page 5 Mark Scheme: Teachers’ version Syllabus Paper GCE AS/A LEVEL – October/November 2010 9702 35 (e) Identifying limitations (4 marks) and suggesting improvements (4 marks) (i) Limitations [4] (ii) Improvements [4] Do not credit A Two readings are not Take more readings and plot Few readings. Take more enough (to draw a a graph/calculate more k readings and calculate conclusion. values (and compare). average. Only one reading. B Difficult to balance with Drill hole higher up/switch off Closed room. reason e.g. unstable or fans/a.c./close windows. effect of fans/draughts/a.c. C Difficult to judge when Method of ensuring strip is Strip not straight/parallel/ wooden strip horizontal/parallel to bench horizontal. horizontal/parallel (to the e.g. use a spirit level or bench). metre rule(s) to measure height of both ends/sight Use set square. against window. Allow detailed use of set square. D Difficult keeping x constant/ Method of fixing cotton loop weights move. to rule e.g. tape, glue. E Difficult to measure θ Use a plumb line/clamped Bigger protractor. Paper because hard to judge ruler/clamp protractor. behind protractor. vertical/movement of hand. F Friction at pulley/between Use lubricant/method of Friction. Better pulley/ nail and wooden strip. reducing friction. smooth(er) string/thin(ner) string. Friction between string and pulley. Lubrication between string and pulley. G Mass (values) not accurate. Use balance/method of Weigh masses. weighing mass. Do not credit ‘parallax problems’, ‘use assistant’ or references to sensors, computers or videos. [Total: 20] © UCLES 2010

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