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The Taste Of Watermelon Essay

1284 words - 6 pages

UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS
GCE Ordinary Level

MARK SCHEME for the May/June 2009 question paper for the guidance of teachers

5054 PHYSICS
5054/04 Paper 4 (Alternative to Practical), maximum raw mark 30

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 ...view middle of the document...

g. the line of sight must be perpendicular to the scale • incorrect explanations of parallax error are marked incorrect, • e.g. the eye is perpendicular to the reading/meniscus Error Carry Forward (e.c.f.): This applies in all calculations so one mistake is not penalised in later parts of the question. It is indicated by e.c.f. in mark scheme. There is usually no e.c.f. within a single calculation. Significant Figures (s.f.): In calculations, candidates are penalised for incorrect s.f. when asked to give answers to a suitable number of s.f. When measuring or reading from a diagram candidates must give answers to a suitable number of s.f. A common error here is to give too few s.f. e.g. when a measurement is 13.0 cm and the candidate quotes 13 cm. Graphs: Axes: labelled both quantity and unit labels and quantities to be on correct axes Scales: must fill at least ½ grid in both directions i.e. cannot be doubled must be ‘sensible’, i.e. not multiples of 3, 7 etc. should follow instructions, e.g. start from the origin should have at least three values marked Points: allow x, • or ☼ (dot maximum size 1 mm diameter i.e. ½ small square) must be accurately plotted to ± ½ small square not awarded if scale not sensible Line: attempt at single smooth line: curves need not be perfect! straight lines - must be drawn with a ruler - must be best fit i.e. equal number of points above and below line - must not be skewed, i.e. not points at start/end all above/below the line

© UCLES 2009

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Page 3

Mark Scheme: Teachers’ version GCE O LEVEL – May/June 2009

Syllabus 5054

Paper 04

Awarding Marks All marking points are called B, M, C or A marks. B A C M e.c.f. c.a.o. marks are independent of other marking points. marks are answer marks. If awarded all preceding C marks are automatically given. marks are compensation marks. If the final answer (A mark) is not awarded the preceding C marks may be awarded for correct working seen. marks must be awarded for any subsequent A marks to be awarded. error carry forward correct answer only

© UCLES 2009

www.xtremepapers.net

Page 4 1

Mark Scheme: Teachers’ version GCE O LEVEL – May/June 2009 31 6 62 12 91 123 151 186 17 24 28 34

Syllabus 5054

Paper 04 B1 B1 B1 B1 B1 B1 B1 B1 [2]

(a) values for P correct values for S correct

(b) axes: correct way round, labelled quantity and unit scales: more than ½ page, linear, sensible, minimum 2 values marked, e.c.f. (a) points: for P plotted accurately, neat (for linear, sensible scale), e.c.f. (a) best fit straight line: for P from origin, neat points: for S plotted accurately, neat (for linear, sensible scale), e.c.f. (a) best fit...

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