MARK SCHEME MAXIMUM MARK : 80 SYLLABUS/COMPONENT ...

NOVEMBER 2001

INTERNATIONAL GCSE

MARK SCHEME

MAXIMUM MARK : 80

SYLLABUS/COMPONENT : 0625/02 PHYSICS (CORE)

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Page 1 of 5

Mark Scheme IGCSE Examinations - June 2001

Syllabus 0625

NOTES ABOUT MARK SCHEME SYMBOLS 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 accuracy marks (A marks) later 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 A 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 allow a C mark to be scored.

c.a.o.

means “correct answer only”

e.c.f.

means “error carried forward” i.e. if a candidate has made an earlier mistake and has carried his incorrect value forward, he may be given marks indicated by e.c.f. provided his subsequent working is correct, bearing in mind his earlier mistake. This prevents a candidate being penalised more than once for a particular mistake, but only applies to marks annotated “e.c.f.”.

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 answer, 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.

un.pen.

means “unit penalty”. An otherwise correct answer will have one mark deducted if the unit is wrong or missing. This only applies where specifically stated in the mark scheme. Elsewhere, incorrect or missing units are condoned.

OR

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

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Paper 2

Page 2 of 5


QUESTION 1 (a)

SCHEME

Paper 2

TARGET GRADE F

MARK

16/8 e.c.f.

C

C1

2 (cm) e.c.f.

C

A1

16 (cm)

(b)

Syllabus 0625

B1

3 2

wider base

F

B1

idea of lowering C of M (however expressed)

C

B1

e.g. heavier base, make it shorter 2 3 (a)

heat it

F

B1

(b)

increases

F

B1

(c)

any suitable example

F

B1

(d)


C

B1 4

4 (a)

(b) (i)

(ii) (c)

ray refracted down

F

M1

parallel to incident ray (by eye)

C

A1

T.I.R. shown

C

M1

correct angle (by eye) if wrong but labelled 50°, then 3

C

A1

ray strikes surface at more than C.A.

C

A1

straight on at first surface

F

M1

straight on at second surface

F

A1 7

5 (a)

(b) (i)

should be refraction at first surface (however expressed)

F

B1

should be dispersion at first surface (however expressed)

C

B1

thermometer / thermocouple / bolometer / hand /

F

B1

I. R. shown above red

C

B1

any two from radio (or TV), microwave, ultra-violet (or UV), x-rays, γ-rays (NOT cosmic)

2F

B1, B1

thermopile / thermistor / thermochromic paper (any one) / goggles NOT I.R. detector (ii) (c)

6

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Page 3 of 5


QUESTION 6 (a)

SCHEME

Syllabus 0625

Paper 2

TARGET GRADE C

MARK

F

B1

(i)

bar magnet held at each end of rod, stated somewhere or clearly implied (ALLOW “side” rather than “end”) magnet won’t attract / repel (either end)

(ii)

magnet attracts both ends

F

B1

(iii)

magnet repels (one end) OR “the one left after the others are identified“

F

B1

iron (allow ferromagnetic)

F

B1

(ii)

electricity / current (in coil) connect to battery NOT current through core

F

B1

(iii)

switch off current OR equiv. NOT switch off electromagnet NOT demagnetise

F

B1

(b) (i)

B1

7 7 (a)

2F

B1, B1

(electric) shock

F

B1

water conducts / transfers electricity (NOT “water and electricity don’t mix”) ALLOW “water is a good conductor”

C

B1

possible short circuit OR possible (electric) shock

C

B1

mention of a fault / short-circuit large current NOT increased current overheating of cables fire any two NOT damage NOT explosion

(b)

(c)

5 8 (a)

some indication that nucleus changes

C

B1

any particle emitted

F

B1

becomes a different atom / nucleus / nuclide / element

C

B1

5 (min)

F

B1

(ii)

4 OR 20/his half-life correctly evaluated

C

B1

(iii)

25 ± 5....nothing else

C

B1

0 2 2

F, C

B2 (-1 eeoo)

1 0 0 NOT -1 accept a dash as a zero

F, C

B2 (-1 eeoo)

(b) (i)

(c)

10

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QUESTION 9 (a) (i)

SCHEME (milli)ammeter OR multimeter set to amp / current range

Syllabus 0625

Paper 2

TARGET GRADE F

MARK B1

(ii)

A e.c.f.

F

B1

(iii)

voltmeter OR multimeter set to volt / p.d. range condone incorrect spelling V e.c.f.

F

B1

F

B1

resistor ALLOW resistance variable RHEOSTAT gets M1, A1 NOT potentiometer vary current OR vary p.d. across R NOT vary resistance OR vary readings (on meters)

F

M1

F

A1

C

B1

find gradient OR choose one point and use p.d./current

F

B1

correct figures from graph seen or implied

F

B1

5 e.c.f. (but NOT from wrong formula)

F

B1

Ω OR ohm

C

B1

greater

F

B1

straight line through origin

F

M1

greater slope e.c.f. from (i ) mark to his (i) ALLOW new graph on p11; mark by eye

C

A1

(iv) (b) (i)

(ii) (c) (i) (ii)

(d) (i) (ii)

14 10 (a) (i)

aluminium

F

M1

greatest density OR “because mass incr. as density incr.”

F

A1

(ii)

aluminium OR his (a) (i)

F

B1

(iii)

aluminium OR his (a) (i)

F

B1

A

C

M1

smallest area

C

A1

small area OR “because pressure incr. as area decr.”

C

B1

great pressure (on sand)

F

B1

any sensible suggestion involving larger area in contact with sand (must involve chair and sand)

F

B1

(b)

(c) (i)

(ii)

9 temperature NOT °C ACCEPT boiling point (of water)

F

B1

(b)

mercury OR alcohol OR pentane

F

B1

(c)

100-100.1

F

B1

°C NOT C° or C

F

B1

11 (a)

special cases 373K B2 212°F B2 (d)

stays the same OR “nothing”

C

B1

(e)

ice

F

M1

pure OR melting

C

A1

any detail of sensible apparatus

C

A1 8

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QUESTION 12 (a) (i) (ii) (b)

(c)

SCHEME

Syllabus 0625

Paper 2

TARGET GRADE

MARK

bigger temperature difference (idea of)

C

B1

the glass is thin OR the window is a good conductor OR because it isn’t double-glazed

F

B1

sum of figures quoted, seen

F

C1

4 150 000 (J/hour)

C

A1

convection radiation through roof /ceiling through floor draughts opening door / window

F

B1

ANY one NOT switching on air conditioning 5

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June 2003

INTERNATIONAL GCSE

MARK SCHEME MAXIMUM MARK: 80

SYLLABUS/COMPONENT: 0625/02 PHYSICS Paper 2 (Core)

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Page 1

Mark Scheme IGCSE EXAMINATIONS – JUNE 2003

Syllabus 0625

Paper 2



M marks

are method marks upon which accuracy marks (A marks) later depend. For an M mark to be scored, the point to which it refers must be seen in the candidate’s answer. If a candidate fails to score a particular M mark, then none of the dependent A 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 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


c.a.o.

means ‘correct answer only’.

e.c.f.

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 e.c.f. provided his subsequent working is correct, bearing in mind his earlier mistake. This prevents a candidate being penalised more than once for a particular mistake, but only applied to marks annotated ‘e.c.f.’.

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


Un.pen.

means ‘unit penalty’. An otherwise correct answer will have one mark deducted if the unit is wrong or missing. This only applies where specifically stated in the mark scheme. Elsewhere, incorrect or missing units are condoned.

OR/or


© University of Cambridge Local Examinations Syndicate 2003

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Page 2


QUESTION 1

8

(b)

EITHER greater AND Thickness of rule OR overlap at ends

2

(a)

(b)

3

(a)

(b)

TARGET GRADE F

SCHEME

(a)

Syllabus 0625

OR smaller AND thread stretched when on rule OR worn rule ends

Paper 2

MARK B1

F

B1 2

(i)

10

F

B1

(ii)

stretch OR shape (or suitable sketch)

C

B1

(i)

120

F

B1

(ii)

up(wards) OR vertical (NOT vertically down) Accept arrow on diagram

F

B1

(iii)

increase size/area of blocks/larger blocks OR increase number of blocks OR less soil in pot (NOT put pot on harder ground)

F

B1 5

0.97 – 0.51

F

C1

0.46

F

A1

(i)

15

F

B1

(ii)

515 e.c.f.

C

B1

(iii)

D = M/V in any form, seen or implied (words/letters/mix)

F

C1

EITHER

OR

OR

460 515

0.46 515

0.46 515 ´ 10-6 e.c.f.

C

C1

893.2…No e.c.f. 8.932… ´ 10-4 (any number of significant figures)

C

C1

0.8932…

0.89

8.9 ´ 10-4

890 (e.c.f. for significant figures)

C

A1

g/cm3 (0.89 kg/dm3 is OK)

kg/cm3 (NOT 8.9-04)

kg/m3

F

B1 9


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Page 3

4

(a)

(b)


(a)

(b)

6

(a)

(b)

Paper 2

idea of air molecules moving (allow vibrating) (N.B. ‘collide’ = ‘moving’)

F

C1

idea of air molecules striking something (condone themselves)

F

C1

idea of air molecules striking walls

C

A1

(i)

moves down

F

B1

(ii)

increases (e.c.f.)

F

M1

C

A1 6

line starting at 0 oC

F

B1

reasonably horizontal line at any temp for > half the time

C

horizontal from zero time as far as dotted line (ignore anything to R. of line)

C

M1 mark alongside graph A1

(i)

C

idea of more collisions (per unit time) (e.c.f.) OR P µ V1

5

Syllabus 0625

must follow from (i)

water boils OR heat loss = heat supplied (NOT evaporates/ turns to gas)

mark (i) and (ii) together

B1

C B1 5

(ii)

gives water/molecules energy to escape OR break bonds OR change state OR heat loss from sides/surface/to air

(i)

normal correct, by eye

F

B1

(ii)

reflected ray correct, by eye (ignore normal; ignore any arrow)

F

B1

(iii)

both i and r correctly marked (condone sloppy normal and sloppy refracted ray)

F

B1

C

B1 4

parallel to ray striking mirror 1 (allow incident ray) OR same direction (NOT equal/same as) (N.B. sentence must be completed, i.e. no inference from line on diagram)


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mark alongside diagram

Page 4

7


(a)

680

(b)

5 points plotted ± ignore 0,0 (e.c.f.)

(c)

8

9

1360

B1

small square (-1 e.e.o.o.)

F

B2

reasonable line through his points – drawn with rule/thickness reasonable

F

B1

(i)

flash

F

B1

light travels quickly OR sound travels slowly (accept figure)

F

C1

light travels faster than sound (accept figure)

F

C1

light travels much faster than sound (accept figures)

C

A1

1400 - 1450 OR correct value from his graph ± 12 square

F

B1

clear and correct indication on graph of how obtained (minimum: dot at appropriate point)

F

B1 10

1 2

1700

Paper 2

F

(iii)

1020

Syllabus 0625

(a)

Charge(s) OR energy (NOT electricity (condone as extra), charged particles (condone as extra), current, electrons (condone as extra), voltage)

C

B1

(b)

(i)

0

C

B1

(ii)

mention of 6V

F

B1

mention of rising OR not instantaneous (NOT ‘reads’)

C

B1

(iii)

any realistic example of something turned on/off after a time lapse, e.g. electronic egg timer, turn-off bedside radio

F

B1 6

(i)

wire shown curved between A and B

F

C1

wire displaced all along between A and B, and reasonably smooth

C

A1

idea of force (in any direction)

F

M1

on current/current-carrying conductor

C

A1

when in magnetic field

C

A1

(a)

(ii)


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Page 5

10

Syllabus 0625

Paper 2

(b)

line curved in opposite direction

F

B1 6

(a)

(i)

electrons OR cathode rays (NOT betaparticles)

F

B1

something ‘hitting’ the screen (NOT ‘form a spot’)

F

B1

idea of fluorescence (of the screen, NOT ‘the gas’)

C

B1

(ii)

focus

C

B1

(iii)

time base OR ms/cm

C

B1

(iv)

electrons/cathode rays deflected (e.c.f. from (i); allow ‘attracted’ if intention clear)

F

B1

something deflected horizontally

C

M1

some idea of repeated sweeps/back and forth

C

A1

(i)

(y-)input (allow y-plates)

F

B1

(ii)

1. trace moves horizontally/sideways/left/right

C

B1

2. trace moves vertically/up/down

C

B1 11

Connection to either side of cell, but not shorted out

F

B1

VR in series with lamp, and not shorted out OR correctly connected as a potential divider (condone inclusion of a switch)

F

B1

(i)

R1 + R2

F

C1

12

F

A1

1. Resistance = p.d./current in any form (words/letters/mix)

F

C1

6/12 e.c.f.

C

C1

0.5 or 12 e.c.f.

C

A1

(b)

11


(a)

(b)

(ii)


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Page 6


Syllabus 0625

Paper 2

2. his calculated current his calculated current

all 3

C

B1

A OR amp OR ampere somewhere in (ii)

F

B1

(iii)

C

B1 10

his calculated current

12

voltmeter shown correctly connected (any recognisable symbol; allow re-drawn circuit)

(a)

his weight

F

B1

(b)

distance OR height

F

B1

(c)

(i)

1000N climber OR heavier OR first

F

B1

(ii)

his answer to (i)

F

B1

(i)

chemical (accept fuel)

C

B1

(ii)

food (accept muscles)

C

B1

(iii)

maintaining body function C

B1 7

(d)

heat loss K.E. sounds

any 1

Mark first correct answer, condone extras


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November 2003

INTERNATIONAL GCSE



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Page 1

Mark Scheme PHYSICS – NOVEMBER 2003

Syllabus 0625

Paper 2



M marks


C marks


A marks


c.a.o.

means ‘correct answer only’.

e.c.f.

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 e.c.f. provided his subsequent working is correct, bearing in mind his earlier mistake. This prevents a candidate being penalised more than once for a particular mistake, but only applied to marks annotated ‘e.c.f.’.

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


Un.pen.

means ‘unit penalty’. An otherwise correct answer will have one mark deducted if the unit is wrong or missing. This only applies where specifically stated in the mark scheme. Elsewhere, incorrect or missing units are condoned.

OR/or


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Page 2

Mark Scheme PHYSICS – NOVEMBER 2003 SCHEME

QUESTION 1

(a)

Syllabus 0625

Paper 2

TARGET GRADE

MARK

(i)

G within block, to left of vertical through midpoint or AB

F

B1

(ii)

Vertical line shown through A

C

B1

A

F

M1

more stable (or equivalent statement) e.g. less likely to topple or “weight within base”

F

A1

so it does not topple over (or equivalent)

F

B1

(b)

(c)

5 2

reference mark on wheel

*“(use stopwatch to) time…” gets only one of these

datum line (could be “top” or “bottom”) *start timing/stopwatch as mark passes datum line time a number of rotations (accept 1 here) time at least 20 rotations

5C

B5

any 5

*stop stopwatch divide time by number of rotations repeat make sure stopwatch at zero 3

5

gravitational OR potential OR PE OR GPE

F

B1

3F

B3

C

B1

motion OR KE OR kinetic heat/internal/thermal

any order (–1 eeoo)

sound heat (accept potential) OR internal/thermal NOT strain potential/NOT chemical potential NOT sound, even as an extra 4

(a)

(b)

(i)

(ii)

5

vehicle 2

F

M1

large(r) area (in contact with ground)

C

A1

low/less pressure

C

A1

less likely to sink/get stuck

F

A1

small area

F

C1

large pressure

F

B1

(weight spread over) large(r) area NOT body area

C

B1

small/less pressure

C

B1

reference to weight somewhere in (b)

C

B1 9

5

(a)

(i)

ray perpendicular to surface at A (by eye)

F

B1

(ii)

normal at B correct (by eye)

F

B1

(iii)

ray refracted down at B, but NOT along surface

C

B1

(iv)

normal at D correct (by eye)

F

B1

(v)

ray refracted up at D, but NOT along surface

C

B1

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Page 3

(b)

(a)

Syllabus 0625

converging OR will meet OR *one up, one down ALLOW * “opposite”

C

B1

straight on OR split (depending on thickness of “ray”) OR no change (indirection) OR not refracted

F

B1

(i)

speed

F

B1

(ii)

frequency, ALLOW wavelength

C

B1

(iii)

wavelength

F

B1

gamma OR γ OR cosmic

C

B1

8

4

condone x-rays as an extra (a)

(b)

B1

*only if diagram acceptable

C

(b)

7

Paper 2

same deviation (or equivalent) OR “angles of refraction same” (c)

6


straight line sloping up to right

F

B1

through origin

F

B1

(i)

voltmeter OR multimeter on volts range (condone spelling)

F

B1

(ii)

potential difference OR p.d. OR volts/voltage (no e.c.f.)

F

B1

(iii)

ammeter OR multimeter on current/amps range (condone spelling)

F

B1

(iv)

current OR intensity OR amps/amperes OR ampage (no e.c.f.) NOT A

F

B1

(v)

evidence of 7.5

F

C1

evidence of 0.3

F

C1

7.5/0.3 OR V/I OR volts/current e.c.f. if written down

C

C1

25 e.c.f. only if V/I used

C

A1

Ω or ohm

C

B1

hisR/50

F

C1

0.5 (Ω/m) e.c.f.

C

A1

(vi)

13 8

(a)

(b)

EITHER

OR

iron filings

(plotting) compass

F

B1

NOT “put” sprinkle/spread/pour/scatter

place near end of magnet 0000

F 0000000

B1 000000

tap card

mark end(s) of compass

C

B1

further detail

further detail

C

B1

F

B1

attraction of compass S pole repulsion of compass N pole attraction of S pole of another magnet repulsion of N pole of another magnet

any 1

attraction of Earth’s N pole repulsion of Earth’s S pole


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Page 4

9

(a)

(i)

(ii)

(iii) (b)


Syllabus 0625

Paper 2

decreases

F

M1

by 2

C

A1

decreases

F

M1

by 2

C

A1

decreases

C

B1

66 (yrs)

F

C1

evidence of 3 half-lives

C

C1

fraction 1/8 seen or implied

C

C1

400

C

A1 9

1 small square (–1 eeoo) ignore 2 0,0 (–1 for very large blobs)

3F

B3

(b)

45 circled OR 2 circles ACCEPT point circled on graph

F

B1

(c)

idea of stretching more than before (for same load increase) OR reference to elastic/proportional limit in some way

C

B1

10 (a)

points plotted correctly ±

(d)

11 (a)

EITHER

OR

measure unloaded length ALLOW “measure spring” NOT extension

idea of fixed end and free end

F

B1

measure loaded length NOT extension

note position of free end, no load

F

B1

subtract

measure movt. free end, loaded

F

B1 8

(i)

100

F

B1

(ii)

0

F

B1

(iii)

indication to the left of 0°C mark

C

B1

C

B1

(b)

expansion of a solid expansion of a gas/pressure of a gas current/pd/e.m.f. of a thermocouple conductivity/resistance of a conductor/wire/thermistor…..

any 1

colour of a hot wire melting of a wax NOT expansion of alcohol ACCEPT density of a liquid N1/N2 = V1/V2

12 (a)

(b)

in any form

4 F

C1

8000/N2 = 240/6 or correct substitution into correct equation

F

C1

200

F

A1

ALLOW B1 for 20 if 800 used instead of 8000 (working must be shown)

(i)

200 e.c.f. i.e. his (a)

F

B1

(ii)

400 e.c.f. i.e. 2 x his (a), evaluated

C

B1 5


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June 2004

INTERNATIONAL GCSE



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Page 1

Mark Scheme PHYSICS - JUNE 2004

Syllabus 0625

Paper 2



M marks


C marks


A marks


c.a.o.

means “correct answer only”.

e.c.f.

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 e.c.f. provided his subsequent working is correct, bearing in mind his earlier mistake. This prevents a candidate being penalised more than once for a particular mistake, but only applies to marks annotated “e.c.f”.

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


Un.pen.

means “unit penalty”. An otherwise correct answer will have one mark deducted if the unit is wrong or missing. This only applies where specifically stated in the mark scheme. Elsewhere, incorrect or missing units are condoned.

OR/or


© University of Cambridge International Examinations 2004

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Page 2


QUESTION

1

3

Paper 2

TARGET GRADE

MARK

(a)

10

F

B1

(b)

division by 5 OR division by 6

F

C1

2.0 OR 2

C

A1

10 × his(b) OR 11 × his(b)

F

C1

20

C

A1 5

straight vertical arrow upwards to/from rail

F

B1

arrow to R of centre of rail

F

C1

arrow at R.H. end of rail (within 2 × width of resting block)

F

A1

(b)

moment ticked

F

B1

(c)

reduce weight/mass OR shorten rail, lighter rail, thinner rail, open sideways, suitable long handle, suitable 2 pulley system

F

B1 5

(a)

PQ or 0-50s or the horizontal part NOT just P or just Q

F

B1

(b)

changing speed (however indicated) NO e.c.f from (a). ACCEPT “acceleration” but NOT “increasing speed”

F

B1

(c)

distance = area indicated in words or figures anywhere in (c)

F

B1

20 × 50

F

C1

1000

F

A1

½ × 20 × 50 OR ½ × his(i)

C

C1

500

C

A1

(iii)

his(i) + (ii) correctly evaluated

F

B1

(iv)

his(iii)/100 OR total distance/total time stated

F

C1

correct evaluation

F

A1 10

(c)

2

SCHEME

Syllabus 0625

(a)

(i)

(ii)

c.a.o

c.a.o


9Dwebsite.tk

Page 3

4

(a)

(b)

(c)

5

6

7


Syllabus 0625

Paper 2

(horizontal) force allow F

F

B1

distance (travelled from A to B) condone “perpendicular” allow D OR d OR S

F

B1

goes faster OR less time

F

B1

accelerates

C

B1

(i)

2nd person (however expressed)

F

B1

(ii)

more work/energy OR bigger force OR pulls harder

F

B1

smaller time OR greater speed (“more work/second” gets B1, B1)

C

B1 7

(a)

drops OR decreases OR cools down

F

B1

(b)

idea of loss of molecules (from surface) OR molecules evaporate

F

M1

more energetic/faster molecules (SPECIAL CASE remaining molecules slower B1)

C

A1

(c)

any sensible example where cooling is noticeable e.g. (feeling cold) after swimming, sweating, refrigerators

C

B1 4

(a)

(increased) internal energy OR (increased) KE of molecules OR (increased) thermal/heat (energy)

C

B1

(b)

any mention of thermal capacity

C

C1

smaller thermal capacity

C

A1 3

light wave fastest

2F

B1+B1

longitudinal

F

B1

transverse

C

B1

transverse

F

B1

F

B1 6

(a)

water wave slowest (b)

(c)

light wave ticked

) ) )

use + = 0 if extras


9Dwebsite.tk

Page 4

8

9

A B C D

Syllabus 0625

magnet OR magnetised magnet OR magnetised iron OR unmagnetised aluminium

Paper 2

F F C C

B1 B1 B1 B1 4

(a)

points plotted correctly ( ± ½ small square)

3F

B3 (-1 eeoo)

(b)

smooth curve through points by eye, not too thick

F

B1

(c)

correct construction lines shown (allow dot on curve at correct place)

C

B1

correct value from his graph, based on 800-400 ( ± ½ square)

F

B1

(i)

smaller

F

B1

(ii)

the same OR no change

C

B1 8

(i)

less turns on secondary ACCEPT “because Np=4800 and Ns=200” ACCEPT “sycoil < pycoil” NOT “secondary < primary”

F

B1

(ii)

V2/V1 = N2/N1

F

C1

correct substitution

F

C1

10

F

A1

1. decreases

F

B1

2. runs slower OR will not work e.c.f. from (iii)1.

F

B1

3C

B3 9

(d)

10


(a)

(iii)

(b)

in any form

ignore stage 1 from stage 2 onwards…… B E A D

) ) ) )

(3 marks for any 3) (2 marks for any 2) (1 mark for any 1)


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Page 5

11

(a)

(b)


(a)

thermistor

F

B1

(ii)

variable resistor (accept rheostat)

F

B1

(iii)

light-dependent resistor (ACCEPT LDR)

F

B1

(i)

1. resistance = p.d./current OR R=V/I OR any correct reorganization ACCEPT mixture of words and letters

F

B1

2. 12/0.5 OR correct sub in his 1, if shown

F

C1

24 c.a.o

F

A1

Ω OR ohm

C

B1

1. decreases

F

B1

2. idea of greater resistance

F

B1

3. dimmer OR does not glow/work/shine NOTE: NO e.c.f. in (ii)

C

B1 10

beard tip to dot perpendicular to mirror (by eye)

F

B1

distance beard tip to mirror = dist. mirror to dot (by eye)

F

B1

reflected ray along line from eye to his dot (by eye)

C

M1

incident ray from beard tip to join reflected ray at mirror

C

A1

arrows from beard to eye

C

B1

(iii)

virtual

C

B1

(iv)

angle of incidence = angle of reflection OR i = r OR “they are equal” OR “sini = sinr”

F

B1

(i)

right hand

F

B1

(ii)

mark shown under L.H. eye on Fig. 11.2

F

B1 9

(i)

(ii)

(b)

Paper 2

(i)

(ii)

12

Syllabus 0625


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November 2004

INTERNATIONAL GCSE


SYLLABUS/COMPONENT: 0625/02 PHYSICS Theory

9Dwebsite.tk

Page 1

Mark Scheme IGCSE – November 2004

Question

Scheme

1

(a)

Syllabus 0625

Paper 2

Target Grade

Mark

96

F

B1

(b)

top left eye circled

F

B1

(c)

100 – 96 e.c.f.

F

C1

4 e.c.f.

F

C1

4/80 e.c.f.

F

C1

0.05 e.c.f.

F

A1 6

2

(a)

(b)

(i)

21

F

B1

(ii)

1 increases

F

B1

2 falls ) ) both e.c.f. 3 rises )

F

B1

(i)

same

C

B1

(ii)

greater (accept comparison of directions)

C

B1 5

3

(a)

(i)

0.6 x 0.5 x 0.2

F

C1

0.06

F

A1

3

C

B1

mass/volume

F

C1

7.2/his(i)

F

C1

120 e.c.f.

F

A1

kg/m3

C

B1

(i)

“greater than” ticked

C

B1

(ii)

Because of the air in the corrugated cardboard

C

B1

m (ii)

(b)

9 4

(a)

(b)

(i)

chemical ) internal OR heat OR thermal ) any 2 but also accept ) nuclear OR kinetic OR potential for one of the marks

2F

B1, B1

(ii)

radiation

F

B1

(i)

K.E. OR kinetic OR motion

C

B1

(ii)

conduction

F

B1

(iii)

1

gravitational OR P.E. OR potential OR position

F

B1

2

chemical/fuel/food

C

B1 7


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Page 2

5

(a)

(b)

(c)


Syllabus 0625

Paper 2

bright specks OR (smoke) particles OR dots NOT molecules, NOT air particles

F

B1

something moving (however expressed)

F

M1

rapidly OR randomly OR zig-zag

F

A1

air molecules OR air particles (NOT just “air”)

C

M1

collisions between smoke particles and air mols/particles

C

A1

invisible fast moving random

2C

B1, B1

F

B1

) ) any 2 )

Idea of faster movement or more jerky movement

8 6

(a)

aluminum

F

B1

copper

F

B1

gold

F

B1

insulator NOT non-conductor

F

B1

(i)

copper OR aluminum OR gold

F

B1

(ii)

any of the insulators

F

B1

(d)

convection

F

B1

(e)

intelligent mention of convection currents

C

B1

(b) (c)

(accept “to make sure always covered by water” NOT “heat rises”) 8 7

(a)

(i)

(ii)

speed = distance/time in any form

F

C1

correct substitution in his equation OR 1600/5

F

C1

320 c.a.o.

F

A1

C

B1

2C

B1, B1

light travels instantaneously/very fast OR reference to reaction time NOT just faster than sound

(b)

explosion heard sooner/less than 5s second sound/echo/reflection (from rock face) louder

) ) any 2 ) )

6


9Dwebsite.tk

Page 3

8


Syllabus 0625

Paper 2

repulsion

F

B1

repulsion

F

B1

attraction

F

B1

attraction

C

B1

attraction

C

B1 5

9

(a)

(b)

(i)

3 3

(ii) (i) (ii)

) ) both

F

B1

10 + 10

F

C1

20

F

A1

1

1.5A ticked

F

B1

2

3A OR 3.0A

C

B1

C

B1

5 Ω ticked

6 10

(a)

electrons

F

B1

(b)

neutrons OR atoms

F

B1

(c)

electrons

F

B1

(d)

electrons

F

B1

(e)

protons

C

B1

neutrons

C

B1

protons

C

B1

neutrons

C

B1

(f)

8 11

(a) (b)

(i)

A or E

F

B1

(ii)

CE or AC or 2.5 cm

F

B1

2f, 1C

B1, B1, B1

F

B1

real inverted enlarged

(c)

) ) ) mark in pairs using ✓ + ✗ = 0 ) )

any ray from 0’ to I’ refracting at mid-line of lens or refractions at both surfaces

6


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Page 4

12

(a) (b) (c)


Syllabus 0625

Paper 2

(i)

line from B to intersection

F

B1

(ii)

dot at printed intersection

F

B1

L.H. ornament

C

M1

lower C of M

C

A1

block A

F

M1

narrower/smaller base

F

A1 6


9Dwebsite.tk

Page 5


Syllabus 0625

Paper 2

NOTES ABOUT THE MARK SCHEME SYMBOLS B marks

are independent mark, 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


C marks


A marks


c.a.o.

means “correct answer only”

e.c.f.

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 e.c.f. provided his subsequent working is correct, bearing in mind his earlier mistake. This prevents a candidate being penalised more than once for a particular mistake, but only applies to marks annotated “e.c.f.”

e.e.o.o brackets ()

means “each error or omission” 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 un.pen.

OR/or

Indicates that this must be seen in the answer offered, or something very similar. means “unit penalty”. An otherwise correct answer will have one mark deducted if the unit is wrong or missing. This only applies where specifically stated in the mark scheme. Elsewhere, incorrect or missing units are condoned. Indicates alternative answers, any one of which is satisfactory for scoring the marks.


9Dwebsite.tk

June 2005

IGCSE


SYLLABUS/COMPONENT: 0625/02 PHYSICS Theory

9Dwebsite.tk

Page 1

Mark Scheme IGCSE – JUNE 2005

Syllabus 0625

Paper 2

Question

Scheme

Target Grade

1

100 – 20

F

C1

level shown at 80 (ignore meniscus) ± 1mm (need not actually draw surface)

F

A1

(i)

16 (cm)

F

B1

(ii)

sub of (i) into formula

F

C1

sub of 100 into formula

F

C1

6.25

F

A1

C

B1

(a)

(b)

cm

e.c.f. from (i)

2

Accept working from any two correct values 2

(a)

Mark

7

2100 – 900

F

C1

12 OR

F

A1

F

B1

10.06 (i.e. travel time)

(b)

1500

(c)

1

F

B1

(i)

find area of first trapezium (or equivalent) bold area under graph

C

B1

(ii)

find total area

C

M1

divide by total time OR divide by 12 OR divide by travel time

C

A1

(d)

(ignore unit) OR 15.00 OR ‘1500 to 1800’

7 3

(a) (b)

it turns

F

M1

clockwise

C

A1

(i)

stationary OR nothing

F

B1

(ii)

horizontal arrow (intention of from OR to pivot condone gap, if clear)

F

M1

to left

F

A1

10 (N)

C

B1 6

4

(a)

gravitational

F

B1

(b)

kinetic

F

B1

(c)

kinetic

C

B1

(d)

electrical

F

B1

(e)

internal

C

B1

ACCEPT heat

condone valid extras

5


9Dwebsite.tk

Page 2

5

(a)


(i)

increased

(ii)

molecules move faster/have more energy

Syllabus 0625

Paper 2

F

B1

C

B1

more frequent collisions (condone with each other)/harder collisions

C

B1

collisions with walls

C

B1

idea of collisions causing a force

C

B1

(i)

evaporation

F

B1

(ii)

energy of molecules increases/molecules move faster

C

B1

molecules escape/break bonds

F

C1

faster/higher energy molecules escape

C

A1

OR collisions more energetic

(b)

9 6

(a)

resistance = voltage/current words, figures, mix

F

C1

2F

A1+A1

candidate’s 4 points correctly plotted ± ½ small square -1 e.e.o.o.

2F

B2

(i)

reasonable curve, smooth, not too thick

F

B1

(ii)

resistance/temperature changes smoothly

C

B1

(i)

1500 - 1700 OR candidates lowest point on graph, quoted correctly

C

B1

(ii)

idea of lowest resistance

C

B1

330 (b) (c) (d)

in any form, letters,

6.3

9 7

(a)

(from L to R) infra red (OR x rays/gamma rays

µwave)/ ultra violet/

sound ticked

4F

B1 x 4

F

B1 5

8

(a)

(b)

one 90° deviation at 1st mirror, by eye

F

C1

two 90° deviations at 1st mirror, by eye

F

A1

emerging rays parallel to incident rays, by eye

F

B1

upside down OR inverted OR same size OR real

C

B1 4


9Dwebsite.tk

Page 3

9

(a)


Syllabus 0625

) ) OR speed = 2 x distance/time )

Paper 2

speed = distance/time

(b)

F

C1

2 x 249/332

F

C1

1.5

F

A1

2C

B1 + B1

0.75 and 2.25 ticked extras

in any form

e.c.f. use + x = 0 for

Mark (b) independent of (a) 10 (a)

(b)

5

(i)

conductor OR metal

F

B1

(ii)

metal (but not if answer to (i)) OR any named metal OR any named liquid conductor

F

B1

(ii)

apply an e.m.f. OR apply a p.d. OR equivalent

C

B1

(i)

insulator extra)

F

B1

(ii)


F

B1

F

B1

(c)

NOT non-conductor (but condone as

insulator OR ‘(b)(i)’ e.c.f. from (b)(i) NOT the name of a type of insulator

just

6 11 (a)

same ticked

F

B1

(b)

2

C

B1

(c)

R1 + R2 in any form, letters or numbers

F

C1

4

C

A1

(d) (e)

e.c.f. from (b)

(i)

1Ω ticked

F

B1

(ii)

more than 0.3A ticked

C

B1

(i)

increases/stretches

F

B1

(ii)

increases c.a.o.

C

B1 8

12 (a)

1 (unit)

/

neutral /

1/1800 (unit) OR tiny / OR outside nucleus 1 OR OR negligible 2000 in shell NOT zero (b)

zero

/

-1 (unit)

in nucleus /

in orbit

NOT just negative OR

4F,2C

B1 x6

(i)

proton and neutron

F

B1

(ii)

1.

4 (units)

C

B1

2.

(+)2 (units) NOT -2

C

B1 9


9Dwebsite.tk

Page 4


Syllabus 0625

Paper 2

NOTES ABOUT THE MARK SCHEME SYMBOLS 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


C marks


A marks


c.a.o.

means ‘correct answer only’

e.c.f.

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

e.e.o.o brackets ()

means ‘each error or omission’ 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 un.pen.

OR/or

Indicates that this must be seen in the answer offered, or something very similar. means ‘unit penalty’. An otherwise correct answer will have one mark deducted if the unit is wrong or missing. This only applies where specifically stated in the mark scheme. Elsewhere, incorrect or missing units are condoned. Indicates alternative answers, any one of which is satisfactory for scoring the marks.


9Dwebsite.tk

UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education

MARK SCHEME for the November 2005 question paper

0625 PHYSICS 0625/02 Paper 2 (Theory) Maximum mark 80

This mark scheme is published as an aid to teachers and students, to indicate the requirements of the examination. It shows the basis on which Examiners were initially instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began. Any substantial changes to the mark scheme that arose from these discussions will be recorded in the published Report on the Examination. All Examiners are instructed that alternative correct answers and unexpected approaches in candidates’ scripts must be given marks that fairly reflect the relevant knowledge and skills demonstrated. Mark schemes must be read in conjunction with the question papers and the Report on the Examination. The minimum marks in these components needed for various grades were previously published with these mark schemes, but are now instead included in the Report on the Examination for this session. •

CIE will not enter into discussion or correspondence in connection with these mark schemes.

CIE is publishing the mark schemes for the November 2005 question papers for most IGCSE and GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses.

9Dwebsite.tk

Page 1

Mark Scheme IGCSE – NOVEMBER 2005

Syllabus 0625

Paper 2

MARK 1

(a)

8.5 (cm)

B1

(b)

19.0 OR 19 (± 0.1) (cm)

B1

(c)

his (b) – his (a)

C1

his correct subtraction

A1 [4]

2

(a)

distance/time

C1

25/2

C1

12.5

A1

m/s

B1

(b)

less OR decreased OR slowing down

B1

(c)

more than ecf

B1 [6]

3

(a)

(b)

skate

M1

small area (in contact with ice)

A1

large area ) wind causes large force on side of truck ) any 2 vehicle liable to blow over )

B1,B1 [4]

4

(a)

40 or 160

B1

(b)

720

B1

(c)

W=Fxd

C1

720 x 0.2

C1

144

A1

J OR joule

B1

his(c)/1.2

C1

his(c)/1.2 correctly evaluated

C1

0.5 x his(c)/1.2 correctly evaluated i.e. 60 gets C1, C1, A1 and 120 gets C1, C1, A0) W OR watt OR J/s

A1

(d)

B1 [10]


9Dwebsite.tk

Page 2

5


Syllabus 0625

Paper 2

(a)

level in tube lower, or equivalent

B1

(b)

air has expanded (could be scored in (a), but not twice) OR Kinetic Theory application to pressure

B1

(c)

any sensible comment e.g. limited temp range, air bubbles out of tube, slow acting, large volume of air, change in air pressure, no scale

B1 [3]

6

(a)

(i)

(ii) (b)

current (in coil)

B1

magnetic field (around coil)

B1

magnetised OR attract

B1

current zero at first (even if only at origin)

B1

horizontal first part

B1

vertical rise somewhere

B1

horizontal final part

B1 [7]

7

(a)

three rays parallel and horizontal

B1

(b)

(i)

both principal foci marked

B1

(ii)

refraction at mid-line, then through F (allow 2 surface refractions if lead back to mid-line)

B1

(iii)

ray through F to mid-line, then parallel (allow as (ii))

B1

(iv)

image drawn between axis and intersection, perpendicular to axis C (condone no labelling)

B1

drawing accuracy mark for image 2 squares tall ± 2mm and 4 squares away ± 2mm

B1 [6]

8

(a)

(b)

(i)

iron OR steel OR any ferromagnetic material (B0 if magnetised stated)

B1

(ii)

1. nothing ecf from (i) 2. nothing

B1 B1

L.H. compass pointing to R

B1

top compass pointing to L

B1


9Dwebsite.tk

Page 3


Syllabus 0625

Paper 2

bottom compass pointing to L

B1 [6]

9

(a)

(b)

1 correct

C1

2 correct

C1

4 correct

A1

(i)

all 6 components shown in series (any order) ecf from (a) for symbols

B1

(ii)

voltmeter connected across cell, either our diag or his

B1

(iii)

both

B1

(iv)

0.5

B1

(v)

current stops OR ammeters read zero OR other bulb goes out

B1 [8]

10 (a)

(b)

10 x 4 x 6.5

C1

260 (cm3)

A1

D = M/V in any form, words, letters, numbers, mixed

C1

250/his V

ecf if written down

C1

0.961538

any no. of sig figs ecf

C1

0.96 ecf

A1

g/cm3 unless inconsistent with his figures

B1 [7]


9Dwebsite.tk

Page 4

11 (a)


Syllabus 0625

Paper 2

electrons

B1

(b)

A

B1

(c)

(i)

D

B1

(ii)

idea of detecting electrons/making spot visible

B1

(d)

deflects them

B1

(e)

no air OR no molecules OR no particles OR “nothing”

B1

to stop/slow down/absorb the electrons/cathode rays

B1 [7]

12 (a)

(b)

(i)

time taken for (B0 for half the time)

B1

activity/count-rate/mass etc.

B1

to decrease to half original value

B1

(ii)

radiation due to surroundings

B1

(i)

80 – 25

C1

55 cao

A1

1. 27.5 ecf

B1

2. 52.5 ecf

B1

(iii)

15 ± 1 ecf

B1

(iv)

background remains, even when source has decayed

B1

(v)

curve to the left of existing one

B1

flattening out at 25 count/min

B1

(ii)

[12]


9Dwebsite.tk


MARK SCHEME for the May/June 2006 question paper

0625 PHYSICS 0625/02

Paper 2, maximum raw mark 80

These mark schemes are published as an aid to teachers and students, to indicate the requirements of the examination. They show the basis on which Examiners were initially instructed to award marks. They do not indicate the details of the discussions that took place at an Examiners’ meeting before marking began. Any substantial changes to the mark scheme that arose from these discussions will be recorded in the published Report on the Examination. All Examiners are instructed that alternative correct answers and unexpected approaches in candidates’ scripts must be given marks that fairly reflect the relevant knowledge and skills demonstrated. Mark schemes must be read in conjunction with the question papers and the Report on the Examination. The minimum marks in these components needed for various grades were previously published with these mark schemes, but are now instead included in the Report on the Examination for this session. •

CIE will not enter into discussion or correspondence in connection with these mark schemes.

CIE is publishing the mark schemes for the May/June 2006 question papers for most IGCSE and GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses.

9Dwebsite.tk

Page 1

1

Mark Scheme IGCSE – May/June 2006

Syllabus 0625

TARGET GRADE F F

(a) larger area smaller pressure (b) (i) get larger OR get firmer (ii) molecules move faster ) more collisions (per second) ) pressure increased )

F any 2

(c) (i) increases

3

5

B1 B1 + B1 B1

F C C

B1 B1 B1 9

2F

B2

(b) AB x BC x CD OR l x b x h OR his figures shown multiplied

F

B1

(c) cm3 OR cu.cm OR cubic cm

F

B1 4

(a) P and Q

F

B1

(b) R and S

F

B1

(c) (i) D = M/V in any form, including our figures

F

B1

C C C

C1 A1 B1 6

(a) 6.0 ± 0.1 ) 2.4 ± 0.1 ) 3.1 ± 0.1 )

-1 each error or omission

(ii) 57.5/25 2.3 g/cm3 4

2C

MARK B1 B1

F

(ii) smaller volume more collisions (per second) anywhere in (b)(ii) or (c)(ii), collisions with walls 2

Paper 02

(a) chemical, gravitational, internal, kinetic (if more than 4 ticked, use + = 0 )

2F,2C B1 x 4

(b) kinetic

F

B1

(c) potential

F

B1

(d) chemical

C

B1 7

(a) idea of greater speed idea of molecules further apart

F C

B1 B1

(b) (i) any suitable example involving expansion or contraction e.g. thermometer, thermostat, bimetal strip, rivets, fitting steel tyres

F

B1

C

B1 4

NOT

internal

(ii) any suitable example involving expansion or contraction e.g. expansion gaps in bridges etc, overhead cables, cracking glass


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6


Syllabus 0625

(a) (i) wavelength labelled clearly ± 3mm wavelength labelled clearly ± 1mm

F C

C1 A1

F C

M1 A1

F

M1

F

A1 6

(a) ray bent down at first surface not below normal ray bent down at second surface

F F C

M1 A1 B1

(b) (i) dispersion ticked

F

B1

(ii) red

C

B1

(iii) violet (allow B1,B0 if red and violet both written but interchanged)

C

B1 6

(a) end/point on magnet idea of pointing N (when freely suspended)

C F

B1 B1

(b) repulsive

F

B1

(c) (i) S at top and N at bottom

F

B1

F

B1 5

F F

M1 A1

3F

B3

(ii) reasonable curve

F

B1

(iii) 8 (days) ± 0.5 OR his correct value ± 0.5 correct working shown on graph (minimum: dot on line)

C C

B1 B1 8

C

B1

(ii) filament

F

B1

(iii) electrons ticked

F

B1

(iv) line along axis (by eye) OR conical beam along axis

F

B1

(v) light or glow indicated somehow

F

B1

(b) beam deflection shown beam deflected upwards indication of curve (condone curve outside electric field)

F C C

C1 A1 B1

(c) idea of no obstruction for cathode rays/electrons

C

B1 9

(ii) horizontal line anywhere between top & bottom of wave pattern (b) (measure time for) (count number of) (measure time) (a number of ) OR (waves passing ) OR (for 1 wave ) (waves to pass ) ( ) (to pass ) f = no. of waves OR in 1 second OR f = 1/T time 7

8

(ii) disappears 9

Paper 02

(a) strontium-90 decays most slowly OR longest half-life (b) (i) points correctly plotted ± ½ small square

10 (a) (i) A and B (both)

-1 each error or omission

OR A and C (both)


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Syllabus 0625

11 (a) (i) 10 x 2.5 25 (m)

Paper 02

F F

C1 A1

F F F

C1 M1 A1

(b) 75/2.5 30 (m/s)

C C

C1 A1

(c) accelerated

F

B1

(d) total distance = 3000 (m) total time = 150 (s) average speed = total distance/total time 3000/150 20 (m/s)

F F C C C

C1 C1 C1 C1 A1 13

F F F

B1 B1 B1 3

(ii) speed = distance/time in any form 500/10 50 (s)

12 L1 joined to R3 or R1 L2 joined to R4 L4 joined to R1


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MARK SCHEME for the October/November 2006 question paper

0625 PHYSICS 0625/02

Paper 2 (Core Theory), maximum raw mark 80

This mark scheme is published as an aid to teachers and students, 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. All Examiners are instructed that alternative correct answers and unexpected approaches in candidates’ scripts must be given marks that fairly reflect the relevant knowledge and skills demonstrated. Mark schemes must be read in conjunction with the question papers and the report on the examination. The grade thresholds for various grades are published in the report on the examination for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level syllabuses.

•

CIE will not enter into discussions or correspondence in connection with these mark schemes.

CIE is publishing the mark schemes for the October/November 2006 question papers for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses.

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Page 2

Mark Scheme IGCSE - OCT/NOV 2006

Syllabus 0625

Paper 2


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 accuracy marks (A marks) later 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 A marks can be scored.

C marks


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.

c.a.o.

means "correct answer only".

e.c.f.

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 e.c.f. provided his subsequent working is correct, bearing in mind his earlier mistake. This prevents a candidate being penalised more than once for a particular mistake, but only applies to marks annotated "e.c.f."

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


un.pen.

means "unit penalty". An otherwise correct answer will have one mark deducted if the unit is wrong or missing. This only applies where specifically stated in the mark scheme. Elsewhere, incorrect or missing units are condoned.

OR/or


© UCLES 2006

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Page 3


QU. 1

SCHEME

MARK

55 (s)

B1

(b)

55/5 ecf

C1

11 (s) ecf

A1 OR

OR

OR

300/hour

1 takes 11s

5 takes 55s

1hour for 300

B1

= 5/min

300 take 3300s

300 take 60x55s

3600/300s for 1

B1

takes less than 1 min for 5

less than 1hr for 300

less than 1hr for 300

1 takes less time than this

B1

YES/NO ticked according to his working

3

4

Paper 2

(a)

(c) EITHER

2

Syllabus 0625

B1 7

2nd box ticked

B1

3rd box ticked (use + = 0 for extras)

B1 2

(a)

OP

accelerating

B1

PQ

accelerating

B1

QR

constant speed

B1

RS

slowing down (however expressed)

B1

(b)

O and S (both)

B1

(c)

6 (m/s)

B1

(d)

70 (s)

B1

(e)

find area OPQRS (however expressed)

B1 8

(a)

(i)

radiation

B1

(ii)

conduction

B1

(i)

kinetic (however expressed)

B1

potential (however expressed)

B1

idea of energy loss or friction

B1 5

(b)

(ii)

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Page 4

5

Mark Scheme IGCSE - OCT/NOV 2006 (a)

(b)

6

7

(a)

Syllabus 0625

Paper 2

(magnitude of) force

B1

distance (from fulcrum)

B1

(i)

force

B1

moment OR turning effect

B1

(ii)

F1 + F2 + W

B1

(iii)

F

B1 6

(i)

eye to image line perpendicular to mirror, by eye

B1

object distance = image distance, by eye

B1

(ii)

normal correctly drawn, by eye

B1

(iii)

ray to bottom edge of mirror correct

M1

reflected ray at correct angle to mirror, by eye (condone sloppy normal)

A1

(b)

sensible attempt at explanation

B1

(c)

(i)

2 (m) (NO ecf)

B1

(ii)

distance lady to mirror = 3 (m)

C1

distance moved = 2 (m) (NO ecf)

A1

away from mirror/wall

B1 10

(i)

large, OR accept any large example e.g. cliff

B1

(ii)

speed = distance/time OR speed = 2xdistance/time (in any form)

C1


C1

480 (m) c.a.o.

A1

(a)

(b)

speed = 6/50 OR 3/50

C1

0.12 (m/s) OR 0.06 (m/s)

A1 6

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Page 5

8

9

Mark Scheme IGCSE - OCT/NOV 2006 (a)

Syllabus 0625

Paper 2

(i)

(group) 1

B1

(ii)

(group) 2

B1

(iii)

plastics OR glass OR ebonite

B1

(b)

top – and bottom +

B1

(c)

region/area/space etc.

B1

charge

B1

experiences a force

B1 7

(a)

good straight line through first 5 points, drawn with a rule

B1

(b)

intelligent attempt at a reason

B1

(c)

67 – 40

C1

27 (mm)

A1

2.4 – 2.5 (N)

B1 5

less turns on Sy OR more turns on Py

B1

(b)

voltage OR p.d. OR volts is less

B1

(c)

V1/V2 = N1/N2 in any form

C1


C1

12 (V)

A1

voltage too high OR bell would be damaged

B1 6

92

B1

(b)

orbit OR outside nucleus

B1

(c)

146

B1

(d)

nucleus

B1

(e)

decreases

M1

by 2

A1 6

(d)

10 (a)

(d)

11 (a)

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12 (a)

Syllabus 0625

Paper 2

reverse connections to ammeter or battery

B1

(b)

current OR amps OR amperes

B1

(c)

4 components in series (ignore symbols)

B1

4 recognisably correct symbols (ignore connections)

B1

(i)

voltmeter OR multimeter on volts scale

B1

(ii)

voltmeter shown connected in parallel with resistor

B1

(d)

(e)

I = V/R in any form correct substitution

C1 no ecf from wrong equation

C1

0.4 (A) c.a.o.

A1

(f)

his value of (e)

B1

(g)

(i)

7.5 Ω ticked

B1

(ii)

increases current e.c.f.

B1 12

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0625 PHYSICS 0625/02


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. All Examiners are instructed that alternative correct answers and unexpected approaches in candidates’ scripts must be given marks that fairly reflect the relevant knowledge and skills demonstrated. Mark schemes must be read in conjunction with the question papers and the report on the examination.

•


CIE is publishing the mark schemes for the May/June 2007 question papers for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses.

9Dwebsite.tk

Page 2


Syllabus 0625

Paper 02



M marks


C marks


A marks


c.a.o.


e.c.f.


e.e.o.o.


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. un.pen.


OR/or


© UCLES 2007

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Page 3


Syllabus 0625

Paper 02 TARGET MARK GRADE

1

(a) seconds hand at 35 s minutes hand at or just to R of 60 (up to ½ division)

F C

B1 B1

(b) seconds hand at 55 s minutes hand between 4 and 5

F C

B1 B1

(c) 4 minutes 20 s

F

B1 [Total: 5]

2

(a) speed = distance/time in any form OR 4800/12 400 (s)

F F

C1 A1

(b) straight line up to 12 m/s, 20s ± ½ small square horizontal line for 400 s (e.c.f. for start point and from (a)) straight line down to 0 m/s at 500 s

F F F

B1 B1 B1

F C C

C1 A1 A1

C

A1

F F

C1 A1

(c) distance = ½ base x height OR area under graph OR equation of motion accel. distance = 120 m decel. distance = 480 m NOTE: NO MARKS for using (d) and then going back to (c) total distance = 120 + 4800 + 480 stated (d) average speed = total distance/total time OR 5400/500 OR 5400/920 10.8 (m/s) OR 11 (m/s) c.a.o.

[Total: 11] 3

(a) (i) indication of force at A upward vertical force OR upward force at rt. angles to card

F C

M1 A1

F

B1

(b) when C of M lies outside base (idea of) when vertical through C of M lies outside base (idea of)

F C

C1 A1

(c) (i) less than

F

B1

C

B1

(ii) largest distance from hinge

(ii) idea of C of M of box raised OR matchbox less stable NOT matchbox is taller

[Total: 7]

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Syllabus 0625

(a) (i) large (bird)

Paper 02 F

M1

F

A1

(b) greater the same

F F

B1 B1

(c) small (bird)

F

B1

(d) lost/turned into/decreased (accept turned into KE) as heat ignore mention of sound

F C

M1 A1

(ii) greater weight/mass/force of gravity/heavier

[Total: 7] 5

(a) solid: gas:

2, 3 and 6 ticked 1, 4 and 5 ticked

-1 each error ( use + = 0 for extras) -1 each error ( use + = 0 for extras)

(b) molecules breaking free (of surface) NOT turns into a gas mention of higher energy/faster/mols near surface

F, C F, C

B2 B2

F C

M1 A1 [Total: 6]

6

(a) [mark in pairs, use + = 0] temp. decreasing volume increasing

F F

B1 B1

(b) (i) moved out/backwards/to the R

F

M1

C

A1

(ii) idea of raised temp increases pressure, therefore move piston out to decrease pressure

[Total: 4] 7

(a) (i) (good) conductor OR equiv. NOT conductor of electricity

F

B1

(ii) poor conductor OR (good) insulator (allow electrical) OR to stop your hand getting burned/prevent shock

F

B1

F

B1

F, C

B1+B1

C

B1

(b) (i) conduction (ii) any 2 of conduction, convection, radiation ticked (-1 if evaporation ticked) (c) equal to 40W

[Total: 6] © UCLES 2007

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Syllabus 0625

Paper 02

(a) 50

F

B1

(b) his (a) x 4 200 (Hz) e.c.f.

F F

C1 A1

(c) Yes, because it is between 20 – 20,000 Hz or more than 20 Hz allow e.c.f. from (b) answer must tally with (b)

C

B1 [Total: 4]

9

(a) (i) series OR potential divider

F

B1

(ii) 12 (Ω)

F

B1

(iii) I = V/R in any form 6/his (ii) 0.5 e.c.f. A OR amp(s) OR ampere(s) OR a

F F F F

C1 C1 A1 B1

(iv) his (iii) x 10 5 (V) e.c.f.

F F

C1 A1

(v) his (iv)

C

B1

C C

B1 B1

C

B1

(b) (i) 1. 6 (V) 2. 0 (V) (ii) C or clear mark positioned below A but not lower than bottom of the word contact” allow e.c.f. only if 6 and 0 in (i) are reversed

[Total: 12] 10 (a) connect wire across/to millivoltmeter (any mention of connecting to electricity/battery gets B0 here)

F

B1

F

B1

(b) millivoltmeter deflects

F

B1

(c) generator OR transformer OR induction coil OR coil on a car OR microphone NOT relay/motor/power station etc

F

B1

move wire across magnetic field OR move magnet past wire OR dip magnet into coil made of the wire (condone connect to battery/electricity here)

[Total: 4]

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Syllabus 0625

11 (a) dot to right of S: horiz. line from end/pole, to right (must not curve) dot to left of N: horiz. line from end/pole, to left (must not curve) dot by top LH corner: smooth curve from end/pole, above magnet, to equivalent point at south end dot below magnet: smooth curve between N and S curve leaving & entering side of magnet, not ends (b) arrow clearly indicating N to S

Paper 02 F F

B1 B1

F F C

B1 M1 A1

F

B1 [Total: 6]

12 (a) (i) 2, 2, 0 (accept blank for 0)

F

B1

(ii) 0, 0, 1 (accept blank for 0)

F

B1

(b) protons: 11 neutrons: 13 electrons: same as his protons

F C F

B1 B1 B1

(c) (i) 0

C

B1

(ii) -1

C

B1

(iii) β OR electron OR e OR B OR beta NOT b

C

B1 [Total: 8]

© UCLES 2007

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0625 PHYSICS 0625/02



•



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Page 2

Mark Scheme IGCSE – October/November 2007

Syllabus 0625

Paper 02



M marks


C marks


A marks


c.a.o.


e.c.f.


e.e.o.o.




OR/or


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Page 3


QU. 1

Syllabus 0625

SCHEME

Paper 02 MARK

(a) 60 (cm3)

B1

(b) liquid surface lower than in cylinder liquid surface level with 15 cm3 (± 5 cm3)

C1 A1

(c) less

B1 [Total: 4]

2

(a) 200,000 (m3)

B1

(b) D = M/V in any form his (a) x 1.3 260,000 c.a.o. kg

B1 C1 A1 B1

(c) decreases air expands OR density decreases

M1 A1

(d) hot air rises

B1 [Total: 8]

3

(a) 7.5 (cmHg) 75 (cmHg) (give C1, A1 for 1.0006 x 105 Pa or 1 x 105 Pa (N/m2) if unit given)

C1 A1

(b) nothing OR (Torricellian) vacuum OR Hg vapour

B1

(c) tube level lower reservoir level higher (any amount)

B1 B1

(d) pressures on 2 surfaces equal (always) Hg levels equal (always) OR no Hg column no change when pressure changes

) ) )

any two

B1+B1 [Total: 7]

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Page 4


QU. 4

Syllabus 0625

SCHEME

Paper 02 MARK

(a) (i) arrow labelled W, vertically (by eye) down from somewhere on either boat

B1

(ii) arrow labelled F, down slope, between either boat and slipway

B1

(b) (i) multiply W by (vertical) height raised OR Wh

B1

(ii) multiply F by distance along slope OR Fs

B1

(iii) add (i) and (ii)

B1

(c) time taken

B1 [Total: 6]

5

(a)

o

C

B1

(b) (i) ICE marked at 0

B1

(ii) STEAM marked at 100 (c) expansion/volume/pressure expansion/length resistance bending e.m.f/voltage colour colour change

B1 OF OF OF OF OF OF OF

a gas a solid a resistor/thermistor/wire a bimetal strip a thermocouple a hot surface certain chemicals

) ) ) ) any 2 ) ) )

B1+B1

[Total: 5] 6

(a) (i) uniform acceleration

B1

(ii) 9 (m/s)

B1

(iii) s = vt in any form 90 (m) OR 10 x his (ii), evaluated

C1 A1

(b) average speed is lower

B1 [Total: 5]

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Page 5


QU. 7

Syllabus 0625

SCHEME

Paper 02 MARK

(a) (i) 1.5 (cm)

B1

(ii) circle centred on X, outside printed circle (circle need not be drawn with a compass, but must be carefully drawn) diameter 4.5 cm by eye (b) sound longitudinal, water transverse sound wave faster (than water wave) different frequency/wavelength

) ) )

any 2

M1 A1

B1,B1 [Total: 5]

8

(a) (i) principal focus unambiguously marked focal length approximately indicated focal length precisely indicated, from pole to principal focus (ii) any ray from X to Y, correctly refracted at lens

B1 C1 A1 B1

(b) [mark in pairs, using + = 0] real diminished inverted image distance less

B1 B1 B1 B1

(c) gets smaller gets closer to lens

B1 B1 [Total: 10]

9

(a) points correctly plotted (±½ small square) smooth curve through his points reasonable thickness

–1 e.e.o.o.

B2 B1 B1

(b) (i) 5.3 – 6.1

B1

(ii) 0.9 – 1.7

B1

(c) R = V/I in any form division by 25 or 25 x 10–3 somewhere

C1 C1

(i) answer between 220 and 240

B1

(ii) answer between 40 and 60 Ω shown in either (i) or (ii)

B1 B1

(d) answer compatible with his (c)

B1 [Total: 12]

© UCLES 2007

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Page 6


QU.

SCHEME

10 (a) (i) shape appropriate outside coil (condone incomplete loops) lines mostly parallel within coil pattern roughly symmetrical no lines touching or crossing (ii) iron bar

Syllabus 0625

Paper 02 MARK M1 A1 A1 A1 B1

(b) rods become magnetised same direction repel

M1 A1 B1 [Total: 8]

11 (a) within range 18–20 (mins)

B1

(b) (i) 922 or thereabouts

B1

(ii) his (a)

B1

(c) alpha OR beta

B1 [Total: 4]

12 (a) electrons

B1

(b) move towards P1

M1 A1

(c) idea of making both P3 and/or P4 positive equal potential (earthing of P1 and P2 not required for answer)

B1 B1

(d) fluorescent screen OR any other appropriate method

B1 [Total: 6]

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0625 PHYSICS 0625/02



•



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Page 2


Syllabus 0625

Paper 02

NOTES ABOUT MARK SCHEME SYMBOLS AND OTHER MATTERS B marks


M marks

are method marks upon which accuracy marks (A marks) later 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 A marks can be scored. NOTE: In this paper, note the M marks in Questions 1, 3 and 12.

C marks


A marks


c.a.o.


e.c.f.


e.e.o.o.




OR/or


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Syllabus 0625

(a) (i) 9.2 ± 0.2 (cm)

Paper 02 [B1]

(ii) Centre of mass at centre of rod anywhere between a line vertically above the ‘i’ and the and a line vertically above the left hand ‘1’ in ‘Fig. 1.1’, anywhere across diameter including the surface but NOT outside the surface [B1] (b) Centre of mass clearly to left of centre, inside the rod

[M1]

anywhere between a line vertically above the ‘t’ in ‘to’ and a line vertically above the ‘t’ in the first ‘the’ AND on axis (by eye) [A1] [Total: 4] 2

(a) (i) suitable scale, probably 5 small squares = 10 s, no awkward ratios (ii) (if no scale written on graph, assume our scale) straight line from origin reaching 25 m/s after 10 s NOT horizontal from (0,25) – (10,25) horizontal from 10 – 50 s straight line down from end of his horizontal line reaching axis at 70 s (b) average speed = total distance/total time 1375/his 70 19.64… e.c.f. any number of sig. figs 20 (m/s) e.c.f.

[B1] [B1] [B1] [B1] [B1] [B1] [C1] [C1] [C1] [A1] [Total: 10]

3

F3

[B1]

anticlockwise: F1 F2

[B1] [B1]

(a) clockwise:

(b) c [M1] clockwise moment (accept moment on RH side) was too big [A1] reduce moment by reducing distance [A1] note: moment must be mentioned in both of the last 2 marks; accept turning effect, torque and leverage as alternatives to moment (c) any value bigger than 29 g and less than 30 g, but NOT 29 g or 30 g

[B1] [Total: 7]

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Syllabus 0625

(a) (i) P.E. (however expressed) (e.g. GPE, gravitational, gravity, potential, positional) (ii) chemical

Paper 02 [B1] [B1]

(b) electrician AND because he is heavier/greater force/greater weight/greater gravity force/ greater mass [B1] (c) time AND either work done OR energy used OR equivalent OR weight AND velocity/speed

[B1] [Total: 4]

5

(a) nucleus OR nuclei OR α-particle NOT nucleon or nuclide

[B1]

(b) electron(s) OR e allow β-particle

[B1]

(c) neutron(s) OR n proton(s) OR p

[B1] [B1]

(d) alpha OR α NOT a or A

[B1]

(e) electron(s) OR e allow β-particles

[B1] [Total: 6]

6

(condone rays not drawn with a ruler, if reasonably straight) (a) straight ray through centre of lens (±1 mm on axis by eye) (ignore any arrows)

[B1]

(b) (i) ray correct, either through pole or reasonably parallel to axis and then through F1 (±1 mm in either case) NOTE: any refraction must be at centre line or at both surfaces

[B1]

(ii) (condone image not labelled if it is clear where it is; condone image labelled as ‘object’ if image line clearly drawn) image located at his intersection, even if intersection of incorrect rays [C1] image drawn between axis and his intersection, and not beyond either [A1] (c) clear indication of screen at candidate’s image, using vertical line

[B1] [Total: 5]

© UCLES 2008

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Syllabus 0625

Paper 02

(a) gas ) solid ) any 1 correct liquid ) remaining 2 both correct

[B1] [B1]

i.e. gas, solid, liquid: 2 marks gas, liquid, solid: 1 mark liquid, solid, gas: 1 mark liquid, gas, solid: 0 marks solid, liquid, gas: 0 marks solid, gas, liquid: 1 mark (b) (i) liquid

[B1]

(ii) idea that molecules/particles gain energy OR move faster (condone ‘vibrating’) idea of molecules/particles becoming gaseous/breaking free

[B1] [B1]

(iii) boiling, at one temperature only AND evaporation at any temperature boiling throughout liquid AND evaporation at surface only

[B1] [B1]

(c) (i) solid

[B1]

(ii) 660 (°C) allow 659 (°C) NOT –660 (°C)

[B1] [Total: 9]

8

(a) (i) 1 2 3

ice point OR freezing point of water OR melting point of ice NOT just ‘freezing point’ [B1] ice OR freezing water [B1] pure or melting or ice-water mix [B1] 0 (°C) OR 273 K OR 273 °K [B1]

(ii) 1

steam point OR boiling point of water NOT just ‘boiling point’ 2 steam boiling (water) OR standard pressure 3 100 (°C) OR 373 K OR 373 °K °C OR K OR °K used in either of the parts 3

(b) thermal capacity OR heat capacity, allow specific heat capacity

[B1] [B1] [B1] [B1] [B1] [B1] [Total: 10]

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Page 6 9


Syllabus 0625

Paper 02

(a) correct symbol (b) D A C B

[B1]

all 4 in correct order

(allow B1 for any 2 in correct place)

[B2]

(c) (note: mark 1 and 2 together) (1 mark max from any one line below) too great a current might flow ) fuse might not melt NOT fuse won’t work ) any 2 fuse won’t protect OR appliance might be damaged ) wiring might overheat/melt or equivalent ) fire might be caused ) NOT circuit broken, NOT short circuit, NOT electric shock

[B1,B1]

[Total: 5] 10 (a) R1 + R2 in symbols or figures 60 (Ω)

[C1] [A1]

(b) voltmeter correctly shown between X and Y (or equivalent), must be correct symbol

[B1]

(c) (i) I = V/R 1.5/60 e.c.f from (a) 0.025 A OR a OR amp(s) OR ampere(s) OR mA etc.

[C1] [C1] [A1] [B1]

(ii) 1.5 (V)

[B1]

(d) (i) decreases

[B1]

(ii) decreases

[B1]

(iii) 60 (Ω)

[B1]

e.c.f from (a)

[Total: 11] 11 (a) (i) no current in circuit OR no voltage in circuit e.m.f. induced in AB is cancelled by e.m.f. induced in BC

[B1] [B1]

(ii) idea of straightening out ABC OR rotate ABC (on its axis) OR connect G across AB or CB

[B1]

(b) any valid answer e.g. transformer, induction coil, generator, dynamo, microphone, alternator, computer NOT motor, relay (use right + wrong = 0 for incorrect extras) [B1] [Total: 4]

© UCLES 2008

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Page 7


Syllabus 0625

12 (a) anything less than, or equal to, 30 min between 22 and 27 min, inclusive (b) (i) iodine(-128) OR the second one (ii) radon-220 OR the first one NOTE: NOT radon-222 NOT just radon, unless mention of 55 s in ‘why’ section shortest half-life OR decays most rapidly OR takes least time to decay NOT ‘because it only has a half-life of 55 s’

© UCLES 2008

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Paper 02 [C1] [A1] [B1] [M1]

[A1] [Total: 5]



0625 PHYSICS 0625/02



•



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Page 2


Syllabus 0625

Paper 02



M marks


C marks


A marks


c.a.o.


e.c.f.


e.e.o.o.


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


OR/or


Spelling

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

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

It is expected that all final answers will have correct units. Deduct one unit penalty for each incorrect or missing unit, maximum 1 per question. No unit penalty if unit is missing from final answer but is shown correctly in the working.

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 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.

Work which has been crossed out, but not replaced, should be marked as if it had not been crossed out. © UCLES 2008

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Page 3 1

2

3

(a)

attempt at subtraction 3 hrs 20 mins 200 mins

(b)

200/20 OR 200/10 10 OR 20 e.c.f.

Syllabus 0625

Paper 02 C1 C1 A1

e.c.f. from (a)

C1 A1

(a)

L×B×H 2 × 1.5 × 1 3 (m3)

C1 C1 A1

(b)

M=V×D 3000 (kg) e.c.f. correct units in both (a) and (b)

C1 A1 B1

YZ OR WZ and WY OR XZ and XY

B1

(a)

(b) (i)

4


4.2 – 4.6 (N)

B1

(ii)

his (i) N

B1 B1

(iii)

increases

B1

(iv)

goes up OR oscillates OR accelerates

B1

(a)

radio OR TV ultra-violet

B1 B1

(b)

long wavelength written at LH end

B1

(c)

any three acceptable uses

(d)

red violet (NOT blue, purple, mauve)

[5]

[6]

[6]

B1,B1,B1 B1 B1

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[8]

Page 4 5

(a) (i)


Syllabus 0625

Paper 02

reflected

B1

same frequency

B1

480 (m)

B1

(ii)

distance/time his(i)/1.6 300 (m/s) e.c.f.

C1 C1 A1

(iii)

measured distance incorrect measured time incorrect OR effect of reaction time any reference to temperature any reference to wind any reference to humidity any reference to pressure time interval very small to measure on a stopwatch

(ii) (b) (i)

) ) any 2 ) ) ) ) )

B1,B1

[8] 6

(a)

distance approximately marked (±5 mm) distance accurately marked (±2 mm)

(b) (i) (ii)

C1 A1

falls

B1

air mols bombard surfaces cause pressure on Hg

B1 B1

(c)

Hg at same height as in LH tube (by eye)

(d)

rises falls

rises stays the same

B1 B1 × 4

) )

[10] 7

(a) (i)

(b)

normal correct, by eye

B1

(ii)

reflected ray in correct direction, by eye (condone poor normal)

B1

(iii)

i correctly labelled (condone poor normal)

B1

(iv)

r correctly labelled (condone poor normal)

B1

i=r

(c) (i) (ii)

B1 second mirror correct, by eye

B1

ray parallel to original ray

B1

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[7]

Page 5 8

(a)

(i) (ii)

(b) (i) (ii)

9


Syllabus 0625

Paper 02

N at left and S at right

B1

attract

e.c.f.

B1

N at left and S at right

B1

attract

B1

e.c.f.

(c)

attract

B1

(d)

nothing

B1

(a)

a

B1

(b)

B

B1

(c)

I = V/R 6/4 1.5 A OR amp(s) OR ampere(s)

C1 A1 A1 B1

(d)

connection 2 both receive full voltage OR both run at full brightness if one blows/switched off, other will continue working

B1 B1 B1

contact position shown at centre of potential divider, by eye

B1

10 (a) (b)

current in coil core magnetised armature attracted armature pivots armature pushes contacts closed

) ) ) any 3 ) )

[6]

[9]

B1,B1,B1 [4]

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Page 6 11 (a)


Syllabus 0625

Paper 02

core

B1

(b)

a.c.

B1

(c)

VP/VS = NP/NS in any form correct substitution 200

C1 C1 A1

(d)

voltage too high OR lamp will blow

B1

84

B1

218

B1

12 (a) (b)

(c) (i)

2

B1

(ii)

4 allow both marks for interchanged answers for (i) and (ii), if answers to (a) and (b) were interchanged

B1

(iii)

alpha-particle

B1

© UCLES 2008

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[6]

[5]


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

0625 PHYSICS 0625/02


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.

•



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Page 2

Mark Scheme: Teachers’ version IGCSE – May/June 2009

Syllabus 0625

Paper 02

Notes about Mark Scheme Symbols and Other Matters B marks


M marks


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


c.a.o.

means “correct answer only”.

e.c.f.

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 e.c.f. provided his subsequent working is correct, bearing in mind his earlier mistake. This prevents a candidate being penalised more than once for a particular mistake, but only applies to marks annotated “e.c.f.”

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.

© UCLES 2009

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Page 3 1

2


Syllabus 0625

Paper 02

(a) 35

B1

(b) vehicles/time in any form, letters words or numbers 700/35 e.c.f. (a) 20 e.c.f. (a)

C1 C1 A1

[4]

B1×3

[3]

work

force of gravity on a body how big the body is

mass

power of a given force weight ÷ mass

weight

amount of matter in a body force × distance moved

density

mass ÷ volume the acceleration due to gravity

3

(a) 1500

B1

(b) second box ticked (use + = 0 for extras)

B1

(c) constant speed

B1

(d) award B1 from each of any 2 lines: increased wind/air resistance OR headwind OR roof rack ) rough(er) ground OR flat tyre OR increased road resistance/friction ) brakes applied )

B1 + B1

IGNORE increased speed/changed car shape/increased load IGNORE driver decided to stop 4

[5]

(a) 88 – 92

B1

(b) his (a)

B1

(c) 840 e.c.f. (b)

B1

(d) left level up and right level down L at 80 and R at 150

B1 B1 © UCLES 2009

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[5]

Page 4 5

6


Syllabus 0625

(a) (i) rapid/rapid heat transfer/gain OR rapid reading/response NOT sensitivity/temperature transfer

Paper 02 B1

(ii) strength OR reduce chance of breaking OR to magnify the thread ignore any mention of safety

B1

(iii) sensitivity or equiv. (e.g. idea of large movement of thread)

B1

(b) mercury OR alcohol

B1

(c) 0 and 100 °C on at least 1 temperature

B1 B1

(a) (i) decreasing OR getting lower/quieter/softer

M1

(ii) amplitude/length of wave decreased OR waves got smaller NOT wavelength decreased (b) (i) nothing OR constant

[6]

A1 M1

(ii) waves equally spaced OR wavelength/period/T constant (c) (i) 12 – 14

A1 B1

(ii) 1. 300 (waves, oscillations, vibrations) every second 2. 1/300 (s) OR 0.0033 OR 0.003 with indication of recurring 3 3. 1/his300 × his 12 OR his (1/300) 0.04 (s) e.c.f. (d) (i) yes/

) )

(ii) yes/

) )

(iii) no/

)

–1 e.e.o.o.

B1 B1 C1 A1

B2 [11]

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Page 5 7

8


(a) (i) 1. normal correct, by eye 2. i correctly labelled

Syllabus 0625

Paper 02 B1 B1

(ii) i = r in any recognisable form accept incidence = refraction NOT sin i = sin r B0 for refraction, refrection, reflaction

B1

(iii) V

B1

(iv) none

B1

(b) be reasonably generous: correct inversion stem approx. parallel to card edge

M1 A1

(a) (i) iron (rod)

B1

(ii) plastic (rod)

B1

(b) S S N (c) –

[7]

B1

somewhere on or near rod D, near end C condone extra + or – signs unless contradict

(d) one needle pointing N, by eye both needles pointing N, by eye

B1 C1 A1

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[6]

Page 6 9


Syllabus 0625

Paper 02

Apply max 1 un. pen. in (a) and (b) together. Apply at first instance of unit penalty. (a) (i) 6 V

B1

(ii) 50 mA OR 0.05 A

B1

(b) R = V/I in any form, letters, words, numbers OR V/I 6/50 OR 6/0.05 e.c.f. (a) OR 0.12 Ω (0.12 Ω gets 2, 0.12 gets 1) 120 Ω c.a.o. accept V/A instead of Ω (c) (i) increase resistance/ohms double resistance/ohms OR halve e.m.f./voltage/p.d. OR remove one cell/battery (ii) idea of breaking the circuit OR make voltage zero

OR OR OR OR OR

add another resistor decrease e.m.f./voltage/p.d. add another R (in series) use 3 V cell/battery use only 1 cell/battery

OR removing battery OR switch off

(d) (i) infinite OR very large (if figure quoted, must be [25 A) NOT just “higher” (ii) idea of damage but NOT “blows up” ammeter – coil burnt out OR pointer bent battery – overheats OR runs flat quickly circuit – overheat/burn out/insulation melts NOT it trips out

sensible choice of F scale

) ) both lost if scales reversed sensible choice of I scale ) 2. 4 points correctly plotted (± ½ small square) –1 e.e.o.o. – B0 if ridiculous scale on either axis (e.g. non-linear, 3, 7, 9 etc.) – can award both marks if scales interchanged but otherwise O.K. – if any blob clearly >1 square diameter, then –1 for each (max 2) 3. reasonable straight line through his points, including 0,0

(ii) 0.036 – 0.038 OR his correct value ± 0.0005 (B0 if ridiculous scale) (c) (electric) motor OR ammeter OR galvanometer OR voltmeter NOT generator/electronic balance

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C1 A1 B1

B1 C1

) ) any 1 )

10 (a) XY would move up/anticlockwise/motion reversed/pan moves down (b) (i) 1.

C1 C1 A1

A1 [11] B1 B1 B1 B2

B1 B1

B1

[8]

Page 7


Syllabus 0625

Paper 02

11 For (a), (b) and (c), mark the names, not the box (a) CATHODE in bottom left box

B1

(b) UP & DOWN in top middle box

B1

(c) GLOWS in bottom right box

B1

(d) battery shown connected across heater filament, any recognisable symbol ignore extra wires if it would work

B1

(e) electrons NOT beta particles NOT positive electron

B1

(f) vacuum ticked (use + = 0 for extras)

B1

12 (1) electron(s) OR e (ignore any prefix or suffix)

electromagnetic radiation/waves/rays NOT just rays etc.

B1 + B1

~ 8000 units OR very large

zero/nothing NOT small/almost nothing NOT – (dash)

B1 + B1

negative allow – (dash)

no charge OR zero/neutral NOT negligible NOT – (dash)

B1 + B1

idea of not very (penetrating) OR stopped (but if a substance is mentioned, it must be appropriate, not air) NOT “not penetrating” NOT slowly penetrating

idea of extremely (penetrating) OR not stopped (but if a substance is mentioned, it must be appropriate)

B1 + B1

NOT very/strongly/highly penetrating NOT very fast penetrating

© UCLES 2009

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[6]

[8]


MARK SCHEME for the October/November 2009 question paper for the guidance of teachers

0625 PHYSICS 0625/02


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.

•



9Dwebsite.tk

Page 2

Mark Scheme: Teachers’ version IGCSE – October/November 2009

Syllabus 0625

Paper 02



M marks


C marks


A marks


c.a.o.


e.c.f.


e.e.o.o.


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


OR/or


Spelling

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

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

It is expected that all final answers will have correct units. Deduct one unit penalty for each incorrect or missing unit, maximum 1 per question. No unit penalty if unit is missing from final answer but is shown correctly in the working.

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 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.

Work which has been crossed out, but not replaced, should be marked as if it had not been crossed out. © UCLES 2009

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Page 3 1


(a) (i) 20 (cm3) (ii) 25 (cm3)±0.5

Syllabus 0625

Paper 02

) ) both

B1

[1]

(b) 5 (cm3) e.c.f.

B1

[1]

(c) 5/200 e.c.f. 0.025 (cm3) e.c.f.

C1 A1

[2]

[Total: 4] 2

(a) kinetic or K.E. or motion

B1

[1]

(b) strain or elastic

B1

[1]

(c) gravitational or P.E. or G.P.E. or potential

B1

[1]

(d) weight /mass (of athlete) AND height/distance (of bar)

B1

[1]

[Total: 4] 3

(a) (i) 1. increasing steady or uniform 2. constant (ii) horizontal straight line between A & B (b) (i) line on axis between B & C (ii) horizontal straight line between C & D lower than that for AB (c) zero distance or equiv.

M1 A1 B1

[3]

B1

[1]

B1

[1]

M1 A1

[2]

B1

[1]

[Total: 8] 4

(a) (i) moves to the left accelerates to the left

C1 A1

[2]

(ii) arrow to the right 9N

B1 B1

[2]

(iii) blob on diagram clearly indicated as the C of M

B1

[1]

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Page 4


(b) (i) rises (ii) less stable

Syllabus 0625

Paper 02 B1

[1]

B1

[1]

[Total: 7] 5

(a) (i) 1. cooling OR energy/heat lost seen anywhere in (i) 2. solidifying or temperature constant 3. cooling

B1 B1 B1

[3]

(ii) first and last both ticked middle ticked

B1 B1

[2]

(iii) solid accept ice/frozen

B1

[1]

(b) rising curve of some sort idea of mirror image of Fig. 6.1

C1 A1

[2]

[Total: 8] 6

(a) same greater at B greater at B (b) box 1 ticked box 3 ticked

B1 B1 B1 ) ) use + =0 for extras )

[3]

B1 B1

[2]

[Total: 5] 7

(a) q

B1

[1]

(b) F marked close to point of image/object

B1

[1]

(c) [mark in pairs, use + =0] inverted real

B1 B1

[2]

(d) same

B1

[1]

(e) (i) nothing

C1

[1]

A1

[1]

(ii) image blurs

[Total: 7]

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Page 5 8


Syllabus 0625

Paper 02

(a) one sound direct one sound after reflection/echo

B1 B1

[2]

(b) first second one suffers absorption,dispersion

M1 A1

[2]

(c) (i) s = vt in any form (seen somewhere in (c)) time to hear 1st sound = 990/330 or 3 (s)

B1 B1

[2]

(ii) time to hear 2nd sound = (3 × 330)/330 or 9 (s)

B1

[1]

(iii) interval = 6 (s) e.c.f.

B1

[1]

[Total: 8] 9

(a) L.H. circuit – series AND R.H. circuit – parallel

B1

[1]

(b) (i) 280 + 200 480 (Ω)

C1 A1

[2]

(ii) I = V/R in any form 12/his (i) seen or 12/480 need not be seen 0.025 or 25 or 1/40 c.a.o. A or mA as appropriate

C1 C1 A1 B1

[4]

(iii) his (ii) × 200 or proportion or potential divider calculation 5 (V) e.c.f.

C1 A1

[2]

(iv) connect voltmeter ) ) (could be shown on diag) between A and B )

M1 A1

[2]

[Total: 11] 10 (a) (i) core correctly labelled

B1

[1]

(ii) iron

B1

[1]

(iii) idea of magnetic linkage

B1

[1]

C1 C1 A1

[3]

(b) V1/V2 = N1/N2 in any form correct substitution 120 (V)

[Total: 6]

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Page 6


) ) no worn insulation ) ) no loose wires/connections ) ) no short circuits ) ) any 3 plug correctly wired ) ) any idea about continuity check ) ) no sharp bends in cable )

Syllabus 0625

Paper 02

11 no exposed wires

B1 x 3

[3]

[Total: 3] 12 (a) 5 points correctly plotted (–1 e.e.o.o.) reasonable curve through his points

B2 B1

[3]

(b) (i) between 30 and 35 or his correct value ± 5

B1

[1]

(ii) 2 (minutes) or his correct value ± 0.02

B1

[1]

(c) 2 (minutes) or his (b) (ii)

B1

[1]

(d) (i) half-life too short

B1

[1]

B1+B1

[2]

(ii) mark any correct 2, ignore the rest long half life gamma-emitter good penetration similar particle size similar density

) ) ) ) ) any 2 ) ) ) )

[Total: 9]

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