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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS

for the guidance of teachers

0625 PHYSICS
0625/31

Paper 3 (Extended Theory), maximum raw mark 80

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.

•

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.

om
.c

MARK SCHEME for the October/November 2010 question paper

s
er

International General Certificate of Secondary Education

Mark Scheme: Teachers’ version
IGCSE – October/November 2010

Syllabus
0625

Paper
31

NOTES ABOUT MARK SCHEME SYMBOLS & OTHER MATTERS
Points applicable to all answers
B marks

are independent marks, which do not depend on any other marks. For a B mark to be
scored, the point to which it refers must actually be seen in the candidate's answer.

M marks

are method marks upon which further marks depend. For an M mark to be scored, the
point to which it refers must be seen in a candidate's answer. If a candidate fails to
score a particular M mark, then none of the dependent marks can be scored.

C marks

are compensatory method marks which can be scored even if the points to which they
refer are not written down by the candidate, provided subsequent working gives
evidence that they must have known it. e.g. if an equation carries a C mark and the
candidate does not write down the actual equation but does correct working which
shows he knew the equation, then the C mark is scored.

A marks

are accuracy or answer marks which either depend on an M mark, or which are one of
the ways which allow a C mark to be scored.

e.e.o.o.

means "each error or omission".

brackets ( ) around words or units in the mark scheme are intended to indicate wording used to
clarify the mark scheme, but the marks do not depend on seeing the words or units in
brackets.
e.g. 10 (J) means that the mark is scored for 10, regardless of the unit given.
underlining indicates that this must be seen in the answer offered, or something very similar.
OR/or

indicates alternative answers, any one of which is satisfactory for scoring the marks.

Spelling

Be generous about spelling and use of English. If an answer can be understood to
mean what we want, give credit.

Extras

Ignore extras in answers if they are irrelevant; if they contradict an otherwise correct
response or are forbidden by mark scheme, use right + wrong = 0

Ignore

Indicates that something which is not correct is disregarded and does not cause a right
plus wrong penalty.

Not/NOT

Indicates that an incorrect answer is not to be disregarded, but cancels another
otherwise correct alternative offered by the candidate i.e. right plus wrong penalty
applies.

© UCLES 2010


Syllabus
0625

Paper
31

Points applicable to numerically worked answers only
Final
answers

If the final answer to a numerically worked question is correct, with the correct unit and
an acceptable number of significant figures, all the marks for that question are awarded.
The points which could have gained C marks need not be examined, even if wrong.

Ecf

means "error carried forward". This indicates that if a candidate has made an earlier
mistake and has carried his incorrect value forward to subsequent stages of working, he
may be given marks indicated by ecf. provided his subsequent working is correct,
bearing in mind any earlier mistake. This prevents a candidate being penalised more
than once for a particular mistake, but only applies to marks annotated ecf.

Significant
figures

Answers are acceptable to any number of significant figures ≥ 2, except if specified
otherwise, or if only 1 sig. fig. is appropriate.

Units

Deduct one mark for each incorrect or missing unit from an answer that would
otherwise gain all the marks available for that answer: maximum 1 per question.
No deduction is incurred if the unit is missing from the final answer but is shown correctly
in the working.

Arithmetic
errors

Deduct one mark if the only error in arriving at a final answer is an arithmetic one.

Fractions

These are only acceptable where specified.

Extras

Ignore extras in answers if they are irrelevant; if they contradict an otherwise correct
response or are forbidden by the mark scheme, use right + wrong = 0

© UCLES 2010

1


Syllabus
0625

(a) (parallelogram or triangle may have any orientation)
NOT a copy of Fig. 1.1
two sides at right angles, by eye
one side longer than the other
diagonal or completion of triangle drawn and labelled “resultant” OR R
Ignore numerical values. Condone arrows in wrong direction

Paper
31

B1
B1
B1

(b) 98 N – 102 N
(accept value found by calculation)

B1

(c) (vertically) up/opposite to W NOT North

B1

(d) his (b) OR correct value calculated
ignore mass

B1
[Total: 6]

2

(a) constant velocity must be in a straight line/direction of motion is changing

B1

(b) (i) if no force, then constant velocity in straight line OR force is needed
to change direction

B1

body moving in circle is changing direction/velocity/accelerating
so force is needed

B1

(ii) towards centre (of circle)/at right angles to motion/inwards

B1

(iii) friction between tyres and road/reaction from banking of track

B1
[Total: 5]

3

(a) (i) (P =) F/A in any form OR 1000/0.01
100 000 Pa accept N/m2
(ii) multiplication of either force or area by 4
0.08 × his (i) OR 0.02 × his (i)
8000 N e.c.f. from (i)
(2000 N gets C0, C1, A1)
(b) his (ii) – 2000 correctly evaluated
600 kg e.c.f.

C1
A1
C1
C1
A1

C1
A1
[Total: 7]

© UCLES 2010

4


Syllabus
0625

Paper
31

(a) heat/energy to raise/change temperature
of 1 kg/1g/unit mass through 1°C/1K
(mention of change of state scores zero)

M1
A1

(b) Q = mcθ (for θ accept t, T, ∆θ, ∆t, or ∆T)
23800 = 0.93 × c × (41.3 – 13.1)
907.5 or 907 or 908 or 910 J/(kg °C) or J/(kg K) at least 2 sig. figs
(for unit in (b) and (c)(i) condone no brackets and extra solidus)

B1
C1
A1

(c) (i) 1212.9 or 1200 or 1210 or 1213 or 1214 J/(kg °C) or J/(kg K)

B1

(ii) more energy lost (to surroundings)
(average) temperature is higher/initial temperature higher/no cooling
time allowed/temperature rise is lower/time of heating may be longer/
rate of heating may be lower
(d) insulate block/provide lid/cover with shiny foil
)
start & finish same amount below & above room temperature ) any 2
get heater up to temperature before inserting
)
put oil in gap between heater & block
)

B1
B1

B1 + B1

[Total: 10]
5

(a) (i) (speed =) distance/time in any form, words, letters, numbers
0.15 m/s or 15 cm/s
(if answer only, 1 mark for either if no units)

C1
A1

(ii) (PE =) mgh OR mgh OR Wh symbols, words or numbers
100 J OR 98.1 J OR 98 J

C1
A1

(iii) his (ii)/40 OR his (ii)/4
2.5 W OR 2.45 W e.c.f. from (ii)

C1
A1

(b) (input) greater/output less NOT a numerical factor

B1
[Total: 7]

6

(a) incident ray in (more) dense medium
angle of incidence greater than critical angle/42°
no light refracted
reflected with i = r

)
) any 3
)
)

(b) reflection at Q only, no further reflections
(allow B1 only, if there is one further reflection at lower surface)
(give B0 for more than one further reflection)

© UCLES 2010

B1 × 3

B2
[Total: 5]

7


Syllabus
0625

(a) (i) sound

Paper
31
B1

(ii) particle OR mechanical OR compression OR longitudinal
OR matter wave

B1

(iii) ultra violet/uv

B1

(b) v = fλ OR λ = v/f
3.0 × 108/2.5 × 108 OR 3.0 x 108 = 2.5 × 108 λ
1.2 m

B1
C1
A1
[Total: 6]

8

(a) capacitor/capacitance/condenser

B1

(b) (i) 5 Ω

B1

(ii) 5 and 20 both used OR 25
1/R = 1/R1 + 1/R2
4Ω

OR

C1

R 1R 2
(R =)
seen or used
R1 + R 2

(c) EITHER
ammeter reading falls (to zero)
as capacitor charges

C1
A1

OR
no current/reading

M1

P already charged/does not conduct d.c.

A1

(d) Formula for calculation of I (I = V/R) OR P (P = V2/R)
Use of energy = power × time in any form
400 s

C1
C1
A1
[Total: 10]

9

(a) (i) negative at LH end and positive at RH end

B1

(ii) (+ve) charge on A attracts electrons/-ve charges/-ve ions
OR unlike charges attract (ignore reference to + charges)
electrons move to end X/towards A
(unbalanced) +ve charges (left) at end Y NOT repelled to Y

B1
B1
B1

(iii) idea that each electron leaves behind an equal unbalanced proton
in nucleus/B has no net charge/B is neutral/idea that B has not
gained or lost any charges

B1

(b) (i) nothing OR nothing implied

B1

(ii) +ve charge cancelled/neutralised
by electrons/negative charges flowing up from earth

B1
B1
[Total: 8]

© UCLES 2010


10 (a) idea of background radiation
random/different at different times
(b) A

Syllabus
0625

NOT places

Paper
31
M1
A1

nothing OR background
reading doesn’t change (when source removed)

M1
A1

B

gamma OR γ
gamma undeflected (by magnetic field)
uncharged/neutral OR electromagnetic radiation

M1
A1
A1

C

beta OR β
deflection is big/more deflection than alpha
low mass/much smaller than alpha

B1
B1
B1

OR
beta OR β
negative
deflects according to left-hand rule

B1
B1
B1
[Total: 10]

11 battery
a.c. supply

a.c. supply
+ diode

horizontal line across at least 4 squares
above or below horizontal centre line

M1
A1

alternating trace, any shape one or more cycles, at least
4 squares wide
above and below centre line, need not be symmetrical

M1
A1

only humps or only troughs seen, minimum 2 humps or troughs
M1
horizontal lines, approximately same width as humps or troughs,
separating humps or troughs

A1
[Total: 6]

© UCLES 2010

0625 w10 ms_31

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