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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   9702/32 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 32 © Cambridge International Examinations 2013 1 (b) (ii) Value of t in the range 10.0 s ≤ t   ≤ 20.0 s. [1] Evidence of repeat measurements of t  . [1] (c) Six sets of readings of S    and t scores 5 marks, five sets scores 4 marks etc. If trend wrong or no S    or t column –1. Major help from Supervisor –2 (setting up circuit). Minor help from Supervisor –1. [5] Range: Values of S must include 22 (k Ω ) or 10 (k Ω ) and 1.2 (k Ω ) or 1.0 (k Ω ). [1] Column headings: 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/ t   / s –1  1/ S    / k Ω   –1  1/ S    (k Ω   –1 ) t   / s t   (s). ( 1/ t  (s) 1/ S    1/k Ω  1/ S    (k Ω ) –1  are not allowed.) [1] Consistency:  All values of raw t    must be given to the same precision (either 0.1   s or 0.01   s). Significant figures: Significant figures for every row of values of 1/ S   must be the same as or one greater than the s.f. in S as recorded in table. [1] [1] Calculation: Values of 1/ t    calculated correctly. [1] (d) (i)  Axes: 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. [1] Plotting of points:  All observations in the table must be plotted. Points must be plotted to an accuracy of half a small square. Diameter of points must be ≤ half a small square (no “blobs”). [1] Quality:  All points in the table must be plotted (at least 5) for this mark to be awarded. Judge by the scatter of all the points about the straight line. Points must be less than 0.05 k Ω    ─1 from a straight line on the 1/ S axis. [1] (ii) Line of best fit: 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. [1]  Page 3 Mark Scheme Syllabus Paper GCE AS/A LEVEL – May/June 2013 9702 32 © Cambridge International Examinations 2013 (iii) Gradient: 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.   [1] y  -intercept: Either: Correct read-off from a point on the line substituted into y = mx + c.  Read-off must be accurate to half a small square in both  x and  y directions. Or: Intercept read off directly from the graph. [1] (e) Value of a = candidate’s gradient. Value of b  = candidate’s intercept / candidate’s gradient = candidate’s intercept / a  [1] Unit for a  correct and consistent with value e.g. k Ω   s –1 , Ω   s –1 . [1] [Total: 20]   2 (a) (i) Measurement of d   with unit in range 0.5   mm – 2.5   mm. [1]   Evidence of repeated readings of d  . [1]  (ii)  Absolute uncertainty in d in the range 0.2 – 0.5   mm. If repeated readings have been taken, then the absolute uncertainty can be half the range (but not zero if values are equal). Correct method of calculation to get percentage uncertainty. [1]  (c) (i) Measurement of r  1 recorded to nearest 0.1   cm 3 , and in range 1 to 5   cm 3 . [1]  (ii) (iii) Value for n . Correct calculation of V  . [1][1]  (d) Justification of s.f. in V linked to significant figures in ( r  1 – r  2 ) and in n . [1]  (e) (ii) (iii) Second value of d  .   Second value of n. Quality: V larger for larger d.  [1][1][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]  Page 4 Mark Scheme Syllabus Paper GCE AS/A LEVEL – May/June 2013 9702 32 © Cambridge International Examinations 2013 (g)   (i)  Limitations 4   max.   (ii)  Improvements 4 max.  Do not credit A two readings not enough (to draw a conclusion)   take many readings and plot a graph/take many readings and calculate more k values and compare repeat readings/few readings/take more readings and (calculate) average k  /only one reading B1 large uncertainty in d because d is small improved method to measure d e.g. measure OD and wall thickness/image of cross-section with scale flexible tube/rigid tube/wire in tube/micrometer/ d   is small B2 difficult to measure d with reason e.g. tube distorts/difficult to insert both prongs inside tube/difficult to  judge when jaws are in line with edges of d   use travelling microscope/measure volume and calculate d  /use a magnifying glass with scale C difficult to count bubbles with reason e.g. plunger moves unsteadily/plunger sticks/bubbles unexpected/bubbles emerge too quickly method to improve control e.g. use a G-clamp or screw to move plunger/use a narrower diameter syringe with reason (e.g.smaller force needed so better control) bubbles difficult to count/lubrication D difficult to watch the syringe scale and the bubbles at the same time description of method to allow simultaneous measurement e.g. use video with playback/use video to allow slow motion/use video to see bubbles parallax/use assistant/change syringe scale/high speed camera/slow motion camera/light gates E difficult to keep end of tube at 2 cm depth method to keep tube at 2   cm depth e.g. use of clamp/Blu-Tack/tape stick tube/attach tube/water in tube/comments about Blu-Tack seal [Total: 20]  
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