Mark scheme for IGCSE Physics (0625/6) – Alternative to Practical May/June 2000
1 (a) neat, thin line OA 1
neat, thin line AP1P2 1
arrow shown, correct direction on either 1
(b) P2P1 extended to LL’ correct and neat 1
I labelled 1
(c) continuation of IA’ shown 1
(d) IR/OC shown 1
value 2.9 - 3.1 1
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2 (a) Move centre of compass along line from magnet 1
Judged parallel to OX in some sensible way
(e.g. use lined paper with a line along OX or
use ruler and set square, etc) 1
Tap compass to prevent sticking 1
Mark either end of needle as near as possible to
compass then mark A between 1
Look directly down on to compass so centre is
on line 1
(b)(i) N pole marked (RH end) 1
(ii) moves gradually 1
to direction approx. 1
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3 (a) 0-10 1
(b) correct position (between 6.2 and 6.4) 1
(c)(i) 3.4 Ω 1
(ii) 0.2 Ω 1
(d) correct symbol 1
(e) connect variable resistor in series 1
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4 (a) suitable table (rows or columns) 1
mass unit shown 1
temperature unit shown 1
(b)(i) way of taking an average
or there will be errors in readings, so way of
showing expected results without the errors 1
(ii) 1: 0.8 1
2: 3 1
(iii) tick in box 1 and reason (e.g. difficult to measure temp to 1 oC)
or heat losses involved
or easy to measure mass to better than l g) 1
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5 (a) 1.096 (1.10)
1.068 (1.07)
1.006 (1.01)
0.866 ( 0.87) all correct 1
(b) greater accuracy 1
(c)(i) Graph:
scales right way round and suitable i.e. cover at least 1/2 grid no unsuitable
scales e.g. 10 sq = 0.3 1
scales labelled with quantity or unit 1
all plots correct to nearest square 2
(ii) ABCD labelled 1
(iii) T increases, 1 increase is greatest for larger values of d 1
(d) 1.l (+) 1
increased range OR largest difference in T value with larger d values 1
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