Mark scheme for IGCSE Physics (0625/6) – Alternative to Practical May/June 2000
1
(a)
neat, thin line OA
neat, thin line AP1P2
arrow shown, correct direction on either
P2P1 extended to LL’ correct and neat
I labelled
continuation of IA’ shown
IR/OC shown
value 2.9 - 3.1
1
1
1
1
1
1
1
1
8
Move centre of compass along line from magnet
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)
Tap compass to prevent sticking
Mark either end of needle as near as possible to
compass then mark A between
Look directly down on to compass so centre is
on line
N pole marked (RH end)
moves gradually
to direction approx.
1
(a)
(b)
(c)(i)
(ii)
(d)
0-10
correct position (between 6.2 and 6.4)
3.4 Ω
0.2 Ω
correct symbol
1
1
1
1
1
(e)
connect variable resistor in series
1
6
(a)
suitable table (rows or columns)
mass unit shown
temperature unit shown
way of taking an average
or there will be errors in readings, so way of
showing expected results without the errors
1: 0.8
2: 3
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
1
1
(b)
(c)
(d)
2
(a)
(b)(i)
(ii)
3
4
(b)(i)
(ii)
(iii)
5
(a)
(b)
(c)(i)
1
1
1
1
1
1
1
8
1
1
1
1
7
1.096 (1.10)
1.068 (1.07)
1.006 (1.01)
0.866 ( 0.87) all correct
1
greater accuracy
1
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
1
(ii)
(iii)
(d)
scales labelled with quantity or unit
all plots correct to nearest square
ABCD labelled
T increases,
increase is greatest for larger values of d
1.l (+)
increased range OR largest difference in T value with larger d values
2
1
2
1
1
1
1
1
11