Physics 9702 Multiple Choice Mark Schemes

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© UCLES 2021 [Turn over
Cambridge International AS & A Level
PHYSICS 9702/11
Paper 1 Multiple Choice October/November 2021
MARK SCHEME
Maximum Mark: 40
Published
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the
examination.
Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for
Teachers.
Cambridge International will not enter into discussions about these mark schemes.
Cambridge International is publishing the mark schemes for the October/November 2021 series for most
Cambridge IGCSE™, Cambridge International A and AS Level components and some Cambridge O Level
components.

9702/11 Cambridge International AS & A Level – Mark Scheme
PUBLISHED
October/November
2021
© UCLES 2021 Page 2 of 3
Question Answer Marks
1 B 1
2 B 1
3 A 1
4 A 1
5 B 1
6 B 1
7 D 1
8 C 1
9 B 1
10 D 1
11 C 1
12 A 1
13 D 1
14 D 1
15 D 1
16 C 1
17 B 1
18 A 1
19 C 1
20 A 1
21 D 1
22 B 1
23 D 1
24 A 1
25 D 1
26 A 1
27 D 1
28 C 1

PUBLISHED
October/November
2021
29 C 1
30 B 1
31 A 1
32 C 1
33 D 1
34 A 1
35 D 1
36 C 1
37 A 1
38 A 1
39 C 1
40 B 1

PHYSICS 9702/12
MARK SCHEME
Maximum Mark: 40
Published
examination.
Teachers.
components.

PUBLISHED
October/November
2021
1 C 1
2 A 1
3 D 1
4 A 1
5 D 1
6 C 1
7 B 1
8 A 1
9 B 1
10 D 1
11 B 1
12 C 1
13 C 1
14 D 1
15 C 1
16 B 1
17 C 1
18 A 1
19 A 1
20 B 1
21 A 1
22 D 1
23 D 1
24 D 1
25 C 1
26 A 1
27 C 1
28 B 1

PUBLISHED
October/November
2021
29 A 1
30 A 1
31 A 1
32 C 1
33 B 1
34 B 1
35 B 1
36 C 1
37 A 1
38 A 1
39 C 1
40 B 1

PHYSICS 9702/13
MARK SCHEME
Maximum Mark: 40
Published
examination.
Teachers.
components.

PUBLISHED
October/November
2021
1 C 1
2 D 1
3 C 1
4 B 1
5 D 1
6 B 1
7 D 1
8 A 1
9 A 1
10 A 1
11 B 1
12 A 1
13 A 1
14 C 1
15 C 1
16 B 1
17 C 1
18 C 1
19 B 1
20 C 1
21 D 1
22 B 1
23 D 1
24 A 1
25 C 1
26 B 1
27 A 1
28 C 1

PUBLISHED
October/November
2021
29 D 1
30 B 1
31 B 1
32 D 1
33 D 1
34 D 1
35 B 1
36 A 1
37 A 1
38 B 1
39 D 1
40 B 1

PHYSICS 9702/21
Paper 2 AS Level Structured Questions October/November 2021
MARK SCHEME
Maximum Mark: 60
Published
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.
Teachers.
components.

PUBLISHED
October/November 2021
Generic Marking Principles
These general marking principles must be applied by all examiners when marking candidate answers. They should be applied alongside the
specific content of the mark scheme or generic level descriptors for a question. Each question paper and mark scheme will also comply with these
marking principles.
GENERIC MARKING PRINCIPLE 1:
Marks must be awarded in line with:
• the specific content of the mark scheme or the generic level descriptors for the question
• the specific skills defined in the mark scheme or in the generic level descriptors for the question
• the standard of response required by a candidate as exemplified by the standardisation scripts.
Marks awarded are always whole marks (not half marks, or other fractions).
Marks must be awarded positively:
• marks are awarded for correct/valid answers, as defined in the mark scheme. However, credit is given for valid answers which go beyond the
scope of the syllabus and mark scheme, referring to your Team Leader as appropriate
• marks are awarded when candidates clearly demonstrate what they know and can do
• marks are not deducted for errors
• marks are not deducted for omissions
• answers should only be judged on the quality of spelling, punctuation and grammar when these features are specifically assessed by the
question as indicated by the mark scheme. The meaning, however, should be unambiguous.
Rules must be applied consistently, e.g. in situations where candidates have not followed instructions or in the application of generic level
descriptors.

PUBLISHED
Marks should be awarded using the full range of marks defined in the mark scheme for the question (however; the use of the full mark range may
be limited according to the quality of the candidate responses seen).
Marks awarded are based solely on the requirements as defined in the mark scheme. Marks should not be awarded with grade thresholds or
grade descriptors in mind.
Science-Specific Marking Principles
1 Examiners should consider the context and scientific use of any keywords when awarding marks. Although keywords may be present, marks
should not be awarded if the keywords are used incorrectly.
2 The examiner should not choose between contradictory statements given in the same question part, and credit should not be awarded for
any correct statement that is contradicted within the same question part. Wrong science that is irrelevant to the question should be ignored.
3 Although spellings do not have to be correct, spellings of syllabus terms must allow for clear and unambiguous separation from other
syllabus terms with which they may be confused (e.g. ethane / ethene, glucagon / glycogen, refraction / reflection).
4 The error carried forward (ecf) principle should be applied, where appropriate. If an incorrect answer is subsequently used in a scientifically
correct way, the candidate should be awarded these subsequent marking points. Further guidance will be included in the mark scheme
where necessary and any exceptions to this general principle will be noted.
5 ‘List rule’ guidance
For questions that require n responses (e.g. State two reasons …):
• The response should be read as continuous prose, even when numbered answer spaces are provided.
• Any response marked ignore in the mark scheme should not count towards n.
• Incorrect responses should not be awarded credit but will still count towards n.
• Read the entire response to check for any responses that contradict those that would otherwise be credited. Credit should not be
awarded for any responses that are contradicted within the rest of the response. Where two responses contradict one another, this
should be treated as a single incorrect response.
• Non-contradictory responses after the first n responses may be ignored even if they include incorrect science.

PUBLISHED
6 Calculation specific guidance
Correct answers to calculations should be given full credit even if there is no working or incorrect working, unless the question states ‘show
your working’.
For questions in which the number of significant figures required is not stated, credit should be awarded for correct answers when rounded
by the examiner to the number of significant figures given in the mark scheme. This may not apply to measured values.
For answers given in standard form (e.g. a × 10n) in which the convention of restricting the value of the coefficient (a) to a value between 1
and 10 is not followed, credit may still be awarded if the answer can be converted to the answer given in the mark scheme.
Unless a separate mark is given for a unit, a missing or incorrect unit will normally mean that the final calculation mark is not awarded.
Exceptions to this general principle will be noted in the mark scheme.
7 Guidance for chemical equations
Multiples / fractions of coefficients used in chemical equations are acceptable unless stated otherwise in the mark scheme.
State symbols given in an equation should be ignored unless asked for in the question or stated otherwise in the mark scheme.

PUBLISHED
Abbreviations
/ Alternative and acceptable answers for the same marking point.
( ) Bracketed content indicates words which do not need to be explicitly seen to gain credit but which indicate the context for an answer.
The context does not need to be seen but if a context is given that is incorrect then the mark should not be awarded.
___ Underlined content must be present in answer to award the mark. This means either the exact word or another word that has the
same technical meaning.
Mark categories
B marks These are independent marks, which do not depend on other marks. For a B mark to be awarded, the point to which it refers must be
seen specifically in the candidate’s answer.
M marks These are method marks upon which A marks later depend. For an M mark to be awarded, the point to which it refers must be seen
specifically in the candidate’s answer. If a candidate is not awarded an M mark, then the later A mark cannot be awarded either.
C marks These are compensatory marks which can be awarded even if the points to which they refer are not written down by the candidate,
providing subsequent working gives evidence that they must have known them. For example, if an equation carries a C mark and the
candidate does not write down the actual equation but does correct working which shows the candidate knew the equation, then the
C mark is awarded.
If a correct answer is given to a numerical question, all of the preceding C marks are awarded automatically. It is only necessary to
consider each of the C marks in turn when the numerical answer is not correct.
A marks These are answer marks. They may depend on an M mark or allow a C mark to be awarded by implication.
Annotations
 Indicates the point at which a mark has been awarded.
X Indicates an incorrect answer or a point at which a decision is made not to award a mark.
XP Indicates a physically incorrect equation (‘incorrect physics’). No credit is given for substitution, or subsequent arithmetic, in a
physically incorrect equation.

PUBLISHED
ECF Indicates ‘error carried forward’. Answers to later numerical questions can always be awarded up to full credit provided they are
consistent with earlier incorrect answers. Within a section of a numerical question, ECF can be given after AE, TE and POT errors,
but not after XP.
AE Indicates an arithmetic error. Do not allow the mark where the error occurs. Then follow through the working/calculation giving full
subsequent ECF if there are no further errors.
POT Indicates a power of ten error. Do not allow the mark where the error occurs. Then follow through the working/calculation giving full
TE Indicates incorrect transcription of the correct data from the question, a graph, data sheet or a previous answer. For example, the
value of 1.6 × 10–19 has been written down as 6.1 × 10–19 or 1.6 × 1019.
Do not allow the mark where the error occurs. Then follow through the working/calculation giving full subsequent ECF if there are no
further errors.
SF Indicates that the correct answer is seen in the working but the final answer is incorrect as it is expressed to too few significant
figures.
BOD Indicates that a mark is awarded where the candidate provides an answer that is not totally satisfactory, but the examiner feels that
sufficient work has been done (‘benefit of doubt’).
CON Indicates that a response is contradictory.
I Indicates parts of a response that have been seen but disregarded as irrelevant.
M0 Indicates where an A category mark has not been awarded due to the M category mark upon which it depends not having previously
been awarded.
^ Indicates where more is needed for a mark to be awarded (what is written is not wrong, but not enough). May also be used to
annotate a response space that has been left completely blank.
SEEN Indicates that a page has been seen.

PUBLISHED
1(a) mass / volume B1
1(b)(i) (vernier/digital) calipers B1
1(b)(ii) percentage uncertainty = (0.0004 / 0.0420) × 100
= 1%
A1
1(c)(i) kg m–3 = kg × mn / m or kg m–3 = kg × mn × m–1 M1
–3 = n – 1 and (so) n = –2 A1
1(c)(ii) (Δρ /ρ) = (ΔM / M) + 2(Δr / r) + (ΔL / L) C1
percentage uncertainty = [(0.001 / 1.072) + 2 × (0.0004 / 0.0420) + (0.0001 / 0.1242)] (× 100) C1
= 0.09% + 2 × 0.95% + 0.08%
= 2%
A1
1(c)(iii) ρ = (1.072 × 0.0420–2) / (2.094 × 0.1242)
= 2337 (kg m–3)
C1
∆ρ = 0.021 × 2337
= 49 (kg m–3)
C1
ρ = (2340 ± 50) kg m–3 A1

PUBLISHED
2(a) mass × velocity B1
2(b)(i) kinetic energy = ½mv2 C1
= ½ × 0.24 × 2.32 C1
= 0.63 J A1
2(b)(ii) change in momentum = ½ × 240 × 5.0 × 10–3 C1
= 0.60 N s A1
2(b)(iii) (change in velocity of Y) = 0.60 / 0.12
( = 5.0 m s–1)
C1
final velocity of Y = 5.0 – 2.3
= 2.7 m s–1
A1
or
(final momentum of Y) = 0.60 – 0.12 × 2.3
( = 0.324 Ns)
(C1)
final velocity of Y = 0.324 / 0.12
= 2.7 m s–1
(A1)
2(c) sloping straight line from (0, 0) to t = 3.0ms and another straight line continuous with the first from t = 3.0ms to (5.0, 0) B1
lines showing maximum force of magnitude 240 N B1
lines wholly in the negative F region of the graph B1

PUBLISHED
3(a)(i) σ = F / xy B1
3(a)(ii) ε = (z – w) / w B1
3(a)(iii) E = σ / ε C1
= Fw / xy(z – w) A1
3(b)(i) extension = 2.2 mm (allow 2.0–2.4 mm) A1
3(b)(ii) strain energy = area under graph/line or ½Fx or ½kx2 C1
= ½ × 120 × 1.4 × 10–3 or ½ × 8.6 × 104 × (1.4 × 10–3)2 C1
= 0.084 J A1
3(b)(iii) (some of the) deformation of the wire is plastic/permanent/not elastic
or
wire goes past the elastic limit/enters plastic region
B1
energy (that cannot be recovered) is dissipated as thermal energy/becomes internal energy B1

PUBLISHED
4(a) oscillations (of particles) are parallel to (the direction of) energy transfer B1
4(b)(i) (frequency varies as) vehicle moves relative to (stationary) observer C1
(vehicle) moving towards (observer) gives higher (observed) frequency (than 1.2 kHz) and (vehicle) moving away (from
observer) gives lower (observed) frequency (than 1.2 kHz)
A1
4(b)(ii) Doppler effect B1
4(b)(iii) position of vehicle labelled ‘X’ at top (12 o’clock) position on track B1
4(b)(iv) position of vehicle labelled ‘Y’ at right-hand edge (3 o’clock) position on track B1
4(c) maximum frequency = 1.40 (kHz) or 1.40 × 103 (Hz) C1
1.40 = (1.2 × 320) / (320 – v) C1
v = 46 m s–1 A1
or
minimum frequency = 1.05 (kHz) or 1.05 × 103 (Hz) (C1)
1.05 = (1.2 × 320) / (320 + v) (C1)
v = 46 m s–1 (A1)

PUBLISHED
5(a) sum of current(s) in = sum of current(s) out
or
(algebraic) sum of current(s) is zero
M1
at a junction (in a circuit) A1
5(b)(i) (current in R4 or R1 =) 0.30 + 0.30
(= 0.60 A)
B1
(R =) 2.4 / 0.60 = 4.0 (Ω) A1
or
(p.d. across R3 or R2 =) 2.4 / 2
(= 1.2 V)
(B1)
(R =) 1.2 / 0.30 = 4.0 (Ω) (A1)
5(b)(ii) E = 2.4 + 2.4 + 1.2 C1
= 6.0 V A1
or
total resistance = 10 (Ω) (C1)
E = 10 × 0.60
= 6.0 V
(A1)
5(c) total resistance increases B1
current decreases (in battery) so total power decreases B1

PUBLISHED
5(d) resistivity = RA / L C1
= 4.0 × π × (240 × 10–6)2 / 0.67 C1
= 1.1 × 10–6 Ω m A1
6(a) α-particle mass given as 4u B1
α-particle charge given as (+)2e B1
both β-particles mass given as 0.0005u B1
β+ charge given as (+)e and β– charge given as –e
(Completed table:
mass / u charge / e
α 4 (+)2
β+ 0.0005 (+)1
β– 0.0005 –1
)
B1
6(b)(i) neutron decays into proton and an electron / β– particle B1
6(b)(ii) down to up B1
6(b)(iii) (electron) antineutrino(s) emitted B1
energy (released in decay)/momentum shared between antineutrino and β– particle B1

PHYSICS 9702/22
MARK SCHEME
Maximum Mark: 60
Published
Teachers.
components.

PUBLISHED
marking principles.
descriptors.

PUBLISHED
2 The examiner should not choose between contradictory statements given in the same question part, and credit should not be awarded for any
correct statement that is contradicted within the same question part. Wrong science that is irrelevant to the question should be ignored.
3 Although spellings do not have to be correct, spellings of syllabus terms must allow for clear and unambiguous separation from other syllabus
terms with which they may be confused (e.g. ethane / ethene, glucagon / glycogen, refraction / reflection).
correct way, the candidate should be awarded these subsequent marking points. Further guidance will be included in the mark scheme where
necessary and any exceptions to this general principle will be noted.
awarded for any responses that are contradicted within the rest of the response. Where two responses contradict one another, this should
be treated as a single incorrect response.

PUBLISHED
your working’.
For questions in which the number of significant figures required is not stated, credit should be awarded for correct answers when rounded by
the examiner to the number of significant figures given in the mark scheme. This may not apply to measured values.

PUBLISHED
Abbreviations
Mark categories
B marks These are independent marks, which do not depend on other marks. For a B mark to be awarded, the point to which it refers must
be seen specifically in the candidate’s answer.
providing subsequent working gives evidence that they must have known them. For example, if an equation carries a C mark and
the candidate does not write down the actual equation but does correct working which shows the candidate knew the equation, then
the C mark is awarded.
Annotations

PUBLISHED
but not after XP.
Do not allow the mark where the error occurs. Then follow through the working/calculation giving full subsequent ECF if there are
no further errors.
figures.
M0 Indicates where an A category mark has not been awarded due to the M category mark upon which it depends not having
previously been awarded.

PUBLISHED
1(a) 1012 B1
pico (p) B1
1(b) ampere and metre both underlined (and no other units underlined) B1
1(c)(i) percentage uncertainty = 3.5 + (3.0 × 2) + 2.5 + 2.0 C1
= 14% A1
1(c)(ii) absolute uncertainty = 4.1 × 10–7 × 14 / 100
= 6 × 10–8 Ω m
A1
2(a)(i) E = (Δ)V / (Δ)d C1
= 1340 / 1.4 × 10–2
= 9.6 × 104 N C–1
A1
2(a)(ii) F = Eq or q(Δ)V / (Δ)d C1
q = 4.6 × 10–14 / 9.6 × 104 or 4.6 × 10–14 × 1.4 × 10–2 / 1340
= 4.8 × 10–19 C
A1
sign of charge: negative B1
2(b)(i) (adjacent field) lines have same separation (for both patterns) B1
(direction of lines changes from) downwards to upwards B1

PUBLISHED
2(b)(ii) resultant force = 4.6 × 10–14 + (9.6 × 104 × 4.8 × 10–19)
= 4.6 × 10–14 + 4.6 × 10–14
= 9.2 × 10–14 N
A1
2(b)(iii) (a =) F / m or 2W / m or 2g B1
a = 9.2 × 10–14 / (4.6 × 10–14 / 9.81) = 20 (m s–2)
or
a = 2 × 9.81 = 20 (m s–2)
A1
2(b)(iv) s = ut + ½at2
(1.4 × 10–2 / 2) = ½ × 20 × t2
C1
t = 2.6 × 10–2 s A1
2(c) line from (0, 0.7 × 10–2) to a non-zero point on the t-axis M1
magnitude of gradient of line increases A1

PUBLISHED
3(a) work (done) / time (taken) B1
3(b)(i) zero / 0 J A1
3(b)(ii) work done = 440 × 25
= 1.1 × 104 J
A1
3(c)(i) (Δ)E(P) = mg(Δ)h C1
h = 4.8 × 104 / (1700 × 9.81)
= 2.9 m
A1
3(c)(ii) θ = sin–1 (2.9 / 25)
= 6.7°
A1
3(d) work done = 4.8 × 104 + 1.1 × 104 (= 5.9 × 104 J) C1
time = 5.9 × 104 / 1.7 × 104
= 3.5 s
A1

PUBLISHED
4(a)(i) decrease(s) B1
4(a)(ii) increase(s) B1
4(b) fo = fs v / (v + vs)
= 925 × 338 / (338 + 12)
C1
= 893 Hz A1
4(c) distance = (½ × 2 × 12) + (2 × 12)
(= 36 m)
C1
time taken = 36 / 338
= 0.11 s
A1
5(a) a (much) louder sound can be heard B1
5(b) v = fλ C1
λ = 340 / 530
( = 0.64 m)
C1
height = 0.64 / 4
= 0.16 m
A1
5(c) distance = 0.64 / 2 or 0.16 × 2 or (¾ × 0.64 – ¼ × 0.64)
= 0.32 m
A1

PUBLISHED
6(a) Q = It C1
= 0.80 × 7.5 × 60
= 360 C
A1
6(b) P = EI or P = VI or P = I2R or P = V2 / R C1
0.802 × 0.40 (= 0.256 W)
or
0.48 × 0.80 (= 0.384 W)
C1
efficiency = (0.256 / 0.384) × 100
= 67%
A1
6(c)(i) n = 3.2 × 1022 / (1.3 × 10–7 × 3.0)
= 8.2 × 1028 m–3
A1
6(c)(ii) I = Anvq
v = 0.80 / (1.3 × 10–7 × 8.2 × 1028 × 1.60 × 10–19)
C1
= 4.7 × 10–4 m s–1 A1
6(d) (wire Y has) larger resistance / resistance increases M1
(wire Y has) smaller current / current decreases M1
(average drift) speed is less (in wire Y) A1

PUBLISHED
7(a) (total) momentum before (decay) is zero
or
P has zero momentum
B1
(total momentum after decay must be zero so)
α-particle and Q have momenta in opposite directions
(and therefore velocities are in opposite directions)
B1
7(b) p = 239 (u) × v or 4 (u) × 1.6 × 107 C1
239 (u) × v = 4 (u) × 1.6 × 107
v = 2.7 × 105 m s–1
A1
7(c) E(K) = ½mv2 C1
= ½ × 4 × 1.66 × 10–27 × (1.6 × 107)2 C1
= 8.5 × 10–13 (J)
= 8.5 × 10–13 / 1.60 × 10–13 (MeV)
= 5.3 MeV
A1
7(d)(i) 1. R plotted at (95,147) B1
2. S plotted at (96,146) B1
7(d)(ii) (electron) antineutrino B1

PHYSICS 9702/23
MARK SCHEME
Maximum Mark: 60
Published
Teachers.
Cambridge international will not enter into discussions about these mark schemes.
components.

PUBLISHED
marking principles.
descriptors.

PUBLISHED

PUBLISHED
your working’.

PUBLISHED
Abbreviations
Mark categories
B marks These are independent marks, which do not depend on other marks. For a B mark to be awarded, the point to which it refers must be
seen specifically in the candidate’s answer.
providing subsequent working gives evidence that they must have known them. For example, if an equation carries a C mark and the
candidate does not write down the actual equation but does correct working which shows the candidate knew the equation, then the
C mark is awarded.
Annotations

PUBLISHED
but not after XP.
Do not allow the mark where the error occurs. Then follow through the working/calculation giving full subsequent ECF if there are no
further errors.
figures.
M0 Indicates where an A category mark has not been awarded due to the M category mark upon which it depends not having previously
been awarded.

PUBLISHED
1(a) m = ρV or ρAL C1
W = mg C1
(A =) 24 / (9.81 × 850 × 0.18) = 0.016 (m2) A1
or
P = F / A (C1)
P = ρgh (C1)
(A =) 24 / (9.81 × 850 × 0.18) = 0.016 (m2) (A1)
1(b)(i) (upthrust =) 24 + 8(.0) = 32 (N) A1
1(b)(ii) (∆)p = 32 / 0.016 (= 2000) C1
(Δ)p = ρg(Δ)h
ρ = 2000 / (9.81 × 0.17)
C1
= 1200 kg m–3 A1
1(c)(i) E = ½Fx or E = ½kx 2 or E = area under graph C1
(Δ)E = (½ × 8.0 × 0.40) – (½ × 4.0 × 0.20)
or
(½ × 20 × 0.402) – (½ × 20 × 0.202)
or
½ × (4.0 + 8.0) × 0.20
C1
= 1.2 J A1
1(c)(ii) length = 30 cm A1

PUBLISHED
2(a) force × displacement in the direction of the force B1
2(b) units: kg m s–2 × m = kg m2 s–2 A1
2(c) T1: K and T2: K C1
A: m2 and t: s and L: m C1
c = (kg m2 s–2 m) / (m2 K s)
= kg m s–3 K–1
A1

PUBLISHED
3(a) change in displacement / time (taken) B1
3(b) by calculation:
v 2 = 422 + 232 – (2 × 42 × 23 × cos 54°)
or
v 2 = (42 – 23 cos 54°)2 + (23 sin 54°)2
or
v 2 = (42 – 23 sin 36°)2 + (23 cos 36°)2
C1
v = 34 m s–1 A1
or
by scale diagram: triangle of vector velocities drawn (C1)
v = 34 m s–1 (allow ± 1ms–1 if scale diagram used) (A1)
3(c)(i) (Δ)E = mg(Δ)h or (Δ)E = W(Δ)h C1
h = 6100 / 46 (= 133m) C1
θ = sin–1 (133/280)
= 28°
A1
3(c)(ii) force = 6100 / 280 or 46 sin 28° C1
= 22N A1
3(d) v(s) = 280 / 14 (= 20ms–1) C1
fo = fs v / (v – vs)
fs = 450 × (340 – 20) / 340
C1
= 420 Hz A1

PUBLISHED
4(a) to the left/from the right/from B to A/opposite (direction) to (α-particle) velocity B1
4(b) v2 = u2 + 2as
s = (4.1 × 106)2 / (2 × 2.7 × 1014)
C1
= 0.031 m A1
4(c) E = F / Q or E = ma / Q C1
= (4 × 1.66 × 10–27 × 2.7 × 1014) / (2 × 1.60 × 10–19) C1
= 5.6 × 106 V m–1 A1
4(d) straight line with negative gradient that intercepts both the momentum and t axes B1
4(e) force (on α-particle) B1
4(f)(i) E = ½mv2 C1
= ½ × 9.11 × 10–31 × (4.1 × 106)2 C1
= 7.7 × 10–18 J A1
4(f)(ii) particles have opposite charges B1
(so) forces (on charges) are opposite (directions) B1
β– has less/half the charge so less/half the force B1
4(f)(iii) (electron) antineutrino B1

PUBLISHED
5(a) maximum displacement (of a point/particle on string/wave) B1
5(b) v = λ / T
or
v = fλ and f = 1/T
C1
T = 690 × 10–9 / 3.00 × 108 C1
= 2.3 × 10–15 s A1
5(c)(i) λ = ax / D C1
G = x / D
(so) a = λ / G
A1
5(c)(ii) straight line from origin always below printed line M1
line is half the height of printed line at maximum D A1

PUBLISHED
6(a) R = ρL / A C1
(R =) 5(.0) × 10–7 × 2(.0) / 3.3 × 10–7 = 3.0 Ω A1
6(b)(i) I = 1.2 / 3.0
= 0.40 A
A1
6(b)(ii) r = (1.50 – 1.20) / 0.40 or 1.50/0.40 – 3.0 C1
= 0.75 Ω A1
6(c) E / 1.20 = 1.4 / 2.0 C1
E = 0.84 V A1
or
RXP = (1.4 / 2.0) × 3.0 (= 2.1 Ω)
E = 2.1 × 0.40
(C1)
E = 0.84 V (A1)
6(d) (second wire has) larger resistance/resistance increases M1
p.d. across XY is larger/increases (for second wire)
or
p.d. across the (second) wire is larger/increases
M1
(so) length XP (for second wire) is shorter A1

PHYSICS 9702/31
Paper 3 Advanced Practical Skills 1 October/November 2021
MARK SCHEME
Maximum Mark: 40
Published
Teachers.
components.

PUBLISHED
marking principles.
descriptors.

PUBLISHED

PUBLISHED
your working’.

PUBLISHED
1(a) Value of x with unit and in the range 21.0–23.0 cm. 1
1(b) Value(s) of p to nearest mm and final value with unit and in the range 17.0–19.0 cm. 1
1(c) Value of n with evidence of repeats. 1
1(d) Six sets of readings of p (different values) and n with correct trend and without help from Supervisor scores 4 marks, five
sets scores 3 marks etc.
4
Range: pmin ⩽ 15.0 cm and pmax ⩾ 19.0 cm. 1
Column headings:
Each column heading must contain a quantity and a unit where appropriate.
The presentation of quantity and unit must conform to accepted scientific convention, e.g. p / cm, (1 / p) / (1 / m) or
p–1 / mm–1. There must be no unit for n or 1 / n.
1
Consistency: All values of p must be given to the nearest mm. 1
Significant figures: All values of 1 / p must be given to the same number of s.f. as, or one greater than, the number of s.f. of
the p values as recorded in the table.
1
Calculation: Values of 1 / p are correct. 1

PUBLISHED
1(e)(i) Axes:
Sensible scales must be used, no awkward scales (e.g. 3:10 or fractions).
Scales must be chosen so that the plotted points occupy at least half the graph grid in both the x and y directions.
Axes must be labelled with the quantity that is being plotted.
Scale markings should be no more than three large squares apart.
1
Plotting of points:
All observations in the table must be plotted on the grid.
Diameter of plotted points must be ⩽ half a small square.
Points must be plotted to an accuracy of half a small square in both x and y directions.
1
Quality:
All points in the table (at least 5) must be plotted on the grid.
Trend of points must be correct.
It must be possible to draw a straight line that is within ± 0.002 cm–1 on the 1 / p axis of all plotted points.
1
1(e)(ii) Line of best fit:
Judge by the balance of all points on the grid about the candidate’s line (at least 5 points). There must be an even
distribution of points either side of the line along the full length.
Allow one anomalous point only if clearly indicated (i.e. circled or labelled) by the candidate. There must be at least five
points left after the anomalous point is disregarded.
Line must not be kinked or thicker than half a small square.
1
1(e)(iii) Gradient:
The hypotenuse of the triangle used must be greater than half the length of the drawn line.
Both read-offs must be accurate to half a small square in both the x and y directions.
Method of calculation must be correct, e.g. Δy / Δx.
Gradient sign on answer line matches graph drawn.
1
y-intercept:
Correct read-off from a point on the line and substituted into y = mx + c or an equivalent expression.
Read-off accurate to half a small square in both x and y directions.
or
Intercept read directly from the graph, with read-off at 1 / p = 0, accurate to half a small square.
1

PUBLISHED
1(f) Value of A = candidate’s gradient and value of B = candidate’s intercept.
Values must not be written as fractions.
1
Unit for A correct e.g. cm, m or mm and no unit given for B. 1

PUBLISHED
2(a)(i) Final value of l with unit and in the range 3.0–3.4 cm. 1
2(a)(ii) Value(s) of raw D all to nearest 0.01 cm or all to nearest 0.001 cm
and
final value of D with unit and less than 1.0 cm.
1
2(a)(iii) Correct calculation of V. 1
2(a)(iv) Justification for significant figures in V linked to number of s.f. in D and l. 1
2(b)(i) Value of time t > 1.0 s with unit. 1
Evidence of repeated values of t. 1
2(b)(ii) Percentage uncertainty based on an absolute uncertainty in t in the range 0.2–5 s.
If repeated readings have been taken, then the uncertainty can be half the range (but not zero) if the working is clearly
shown.
Correct method of calculation to find percentage uncertainty.
1
2(c) Second value of l. 1
Second value of t. 1
Second value of t is less than first value of t. 1
2(d)(i) Two values of k calculated correctly. The final k values must not be written as fractions. 1
2(d)(ii) Valid comment consistent with the calculated values of k, testing against a criterion stated by the candidate. 1

PUBLISHED
2(e)(i) A Two readings are not enough to draw a (valid) conclusion (not “not enough for accurate results”, “few readings”).
B Difficulty in measuring time t with a reason (at the start or at the finish) e.g. lifting straw and starting stopwatch
simultaneously/judging or predicting when to stop timing.
C Difficulty linked to oil with detail e.g. difficult to see as colourless/clear/transparent or some oil left in straw drips out
later/oil leaks from straw/paper straw absorbs oil.
D Difficulty linked to raising or positioning the straw e.g. not always in centre/hand moves when lifted/straw tilted/putty
obscures the centre.
E Problem with volume V with reason e.g. D is the external diameter/no account of thickness of straw/squashing
straw/putty goes up straw/oil left in straw.
1 mark for each point up to a maximum of 4.
4
2(e)(ii) A Take more readings and plot a graph or take more readings and compare k values (not “repeat readings” on its own).
B Improved method to measure t e.g. video/film/ record with timer/view frame by frame.
C Improved method to see oil e.g. add dye
or
improved method to contain the oil e.g. flap/cap/plastic straw.
D Improved method to release or positioning of straw e.g. clamp a laser with beam above the centre point/clamp a guide
at the centre/draw a cross on the paper.
E Valid method to measure internal straw diameter e.g. travelling microscope or method to measure thickness directly
e.g. cut open and use micrometer to measure wall thickness.
4

PHYSICS 9702/33
MARK SCHEME
Maximum Mark: 40
Published
Teachers.
components.

PUBLISHED
marking principles.
descriptors.

PUBLISHED

PUBLISHED
your working’.

PUBLISHED
1(a) Value of I with unit and in the range 20–120 mA. 1
1(b) Six (or more) I values with different resistance pairings of R1, R2 without help from the Supervisor scores 5 marks, five sets
scores 4 marks, etc.
5
Range: 33 Ω and 47 Ω resistors used as a pair and 68 Ω and 82 Ω resistors used as a pair. 1
Column headings:
Each column heading must contain a quantity and a unit.
The presentation of quantity and unit must conform to accepted scientific convention, e.g. 1/I / A–1, 1 2
1 2
R R
R R
 
 
+
 
/ Ω.
1
Consistency: All values of I must be given to the nearest 0.1 mA or all to the nearest 0.01 mA. 1
Significant figures: All values of 1 2
1 2
R R
R R
 
 
+
 
must be given to 2 s.f. or 3 s.f.
1
Calculation: Values of 1/I and 1 2
1 2
R R
R R
 
 
+
 
are correct.
1

PUBLISHED
1(c)(i) Axes:
1
Plotting of points:
1
Quality:
Trend of points on graph must be correct.
It must be possible to draw a straight line that is within ± 1Ω on the 1 2
1 2
R R
R R
 
 
+
 
axis of all plotted points.
1
1(c)(ii) Line of best fit:
1

PUBLISHED
1(c)(iii) Gradient:
1
y-intercept:
Read-off must be accurate to half a small square in both x and y directions.
or
Intercept read directly from the graph at 1 2
1 2
R R
R R
 
 
+
 
= 0, accurate to half a small square.
1
1(d)(i) Value of P = candidate’s gradient and value of Q = candidate’s y-intercept.
Values must not be written as fractions.
1
Unit for P is correct e.g. Ω–1A–1 or Ω–1 mA–1 or V–1
and
unit for Q is correct e.g. A–1 or mA–1.
1
1(d)(ii) E and Z correctly calculated from P and Q using:
E = 1 / P
and
Z = EQ or Z = Q / P
and
units for E (V) and Z (Ω) correct.
1

PUBLISHED
2(a)(i) d = 11.0 ± 0.5 cm. 1
Raw value(s) of d recorded to the nearest millimetre. 1
2(a)(ii) A calculated correctly. 1
2(a)(iii) Number of significant figures in A is linked to the number of significant figures in d. 1
2(b)(i) Value of t in the range 0.5 ⩽ t ⩽ 1.0 s and given to 0.1 s or better. 1
Repeated measurement of t. 1
2(b)(ii) Percentage uncertainty based on an absolute uncertainty in the range 0.2–0.5 s.
If repeated readings have been taken, then the uncertainty can be half the range (but not zero) if working is clearly shown.
1
2(b)(iii) Mass in the range 2.0–10.0 g and measured to the nearest 0.1 g or better and with unit. 1
2(c)(i) Second value of d. 1
2(c)(ii) Second value of t is larger than the first value of t. 1
2(d)(i) Two values of k calculated correctly. The final values must not be written as fractions. 1
2(d)(ii) Valid comment consistent with the calculated values of k, testing against a criterion stated by the candidate. 1

PUBLISHED
B Difficulty with filter paper at the start, e.g. paper not horizontal/paper too high to view against ruler/parallax in viewing
start position/paper held by hand which moves/metre rule not vertical.
C Difficult to start stop-watch and release filter paper at the same time.
D Problem with fall of filter paper with a reason, e.g. paper does not fall vertically/erratic path/hits boss or stand/misses
bench/papers separate while falling.
E Difficulty with judging when to stop the stop-watch with a reason, e.g. difficult to align head at bench level/papers
arrive separately.
F Times are small so large error/uncertainty (in t)
or
high percentage uncertainty in t.
4

PUBLISHED
B Improved method to hold/release filter paper, e.g. horizontal bar level with top of rule
or
use a set square with detail, e.g. use set square between bench and ruler
or
use plumb-line.
C Video/record/film with timer/frame-by-frame.
D Use more filter papers/heavier or thicker paper/glue together
or
switch off air-conditioning/close windows/use a wind shield.
E Use a pressure sensor below/position sensor above or below.
F Use a greater distance to fall through
or
use larger diameters/use fewer papers/use lighter papers/use thinner papers
(Credit once only if heavier papers suggested for D and lighter papers suggested for F.)
4

PHYSICS 9702/34
MARK SCHEME
Maximum Mark: 40
Published
Teachers.
components.

PUBLISHED
marking principles.
descriptors.

PUBLISHED

PUBLISHED
your working’.

PUBLISHED
1(a)(i) Value of p in range 35.0–45.0 cm. 1
1(a)(ii) Value of q in range 50.0–70.0 cm 1
1(b) Six sets of readings of p and q (different values) with correct trend and without help from the Supervisor scores 5 marks, five
sets scores 4 marks etc.
5
Range: pmin ⩽ 25.0 cm and pmax ⩾ 65.0 cm. 1
Column headings:
The presentation of quantity and unit must conform to accepted scientific convention e.g. 1/ q (cm–1).
p / q must have no unit.
1
Consistency: All values of q and p must be given to the nearest mm. 1
Significant figures: All values of 1/ q should have the same number of s.f. as, or one more than, the number of s.f. in the
corresponding raw q value(s).
1
Calculation: Values of 1/ q calculated correctly 1

PUBLISHED
1(c)(i) Axes:
1
Plotting of points:
1
Quality:
Trend of points must be correct.
It must be possible to draw a straight line that is within ± 0.001 cm–1 (± 0.1 m–1) on the 1/ q axis (normally y-axis) of all plotted
points.
1
1(c)(ii) Line of best fit:
1
1(c)(iii) Gradient:
1
y-intercept:
Read-off accurate to half a small square in both x and y directions.
or
Intercept read directly from the graph, with read-off at p /q = 0, accurate to half a small square.
1

PUBLISHED
1(d) Value of a equal to candidate’s gradient and value of b equal to candidate’s intercept.
Values are not written as fractions.
1
Units for a and b correct (e.g. cm–1). 1

PUBLISHED
2(a)(i) Raw value(s) of y to nearest 0.1 cm and final value in range 44.0–48.0 cm. 1
2(a)(ii) Raw value(s) of θ to nearest degree and final value in range 40–60°. 1
2(a)(iii) Percentage uncertainty based on an absolute uncertainty in the range 2–5°.
1
2(a)(iv) Correct calculation of D. 1
2(a)(v) Justification based on significant figures in y and θ. 1
2(b)(i) Final value of S with unit and in range 1.00–1.50 s. 1
Repeats: at least two values of nS, where n ⩾ 5. 1
2(b)(ii) All raw times to nearest 0.1 s or all to nearest 0.01 s. 1
2(c) Second values for θ, S and B. 1
Quality: B decreases as θ decreases. 1
2(d)(i) Two values of k calculated correctly. The final k values must not be written as fractions. 1
2(d)(ii) Valid comment relating to the calculated values of k, testing against a criterion stated by the candidate. 1

PUBLISHED
B Difficult to set or keep rod horizontal or string slips on pin.
C Difficult to measure θ with reason e.g. rod moves if touched/parallax error/difficult to hold protractor steady in hand.
D Difficulty with mode of oscillation e.g. rod oscillates in more than one plane/different modes of oscillation/rod twists as it
oscillates from side to side.
E Difficulty with B oscillation with reason e.g. rod hits stand/difficult to release both ends at the same time/hands get in the
way at release.
F Difficult to judge/determine/tell/know start of/end of/complete oscillation.
4
B Notch in pin/use rough pin.
C Clamp protractor/take a photograph and measure θ on photo/measure lengths and use trigonometry.
D Method of restricting other modes of oscillation e.g. two sheets placed either side of rod.
E Improved method of release for B oscillation, e.g. pull towards you/use card gate to release both ends at the same time
or
use longer pin.
F Video/film/record with timer in view/view frame-by-frame
or
use (fiducial) marker at midpoint of oscillation.
4

PHYSICS 9702/35
MARK SCHEME
Maximum Mark: 40
Published
Teachers.
components.

PUBLISHED
marking principles.
• marks are awarded for correct/valid answers, as defined in the mark scheme. However, credit is given for valid answers which go beyond
the scope of the syllabus and mark scheme, referring to your Team Leader as appropriate
descriptors.

PUBLISHED
Marks should be awarded using the full range of marks defined in the mark scheme for the question (however; the use of the full mark range
may be limited according to the quality of the candidate responses seen).
1 Examiners should consider the context and scientific use of any keywords when awarding marks. Although keywords may be present,
marks should not be awarded if the keywords are used incorrectly.

PUBLISHED
Correct answers to calculations should be given full credit even if there is no working or incorrect working, unless the question states
‘show your working’.

PUBLISHED
1(a) Value of H with unit and in the range 20.0–40.0 cm. 1
1(b) Final value of T in the range 2.0–10.0 s. 1
At least two measurements of nT where n ⩾ 5. 1
1(c) Six (or more) sets of readings of w (different values) and time with the correct trend and without help from the Supervisor
scores 4 marks, five sets scores 3 marks, etc.
4
Range: wmin ⩽ 6.0 cm and wmax ⩾ 18.0 cm. 1
Column headings:
The presentation of quantity and unit must conform to accepted scientific convention, e.g. T / s and 1/w / cm–1 or
1/w (1/cm).
1
Consistency: All values of w must be given to the nearest 0.1 cm. 1
Significant figures: All values of 1 / w must be given to the same number of s.f. as (or one more than) the number of s.f. of
raw w.
1
Calculation: Values of 1 / w are correct. 1

PUBLISHED
1(d)(i) Axes:
Scales must be chosen so that the plotted points occupy at least half the graph grid in both x and y directions.
1
Plotting of points:
1
Quality:
Trend of points on graph must be correct.
It must be possible to draw a straight line that is within ± 0.01 cm–1 (or ± 1 m–1) on the 1 / w axis of all plotted points.
1
1(d)(ii) Line of best fit:
1
1(d)(iii) Gradient:
1
1(e)(i) B = candidate’s gradient value. Value must not be written as a fraction. 1
Unit for B correct (e.g. cm s or m s). 1
1(e)(ii) Correct calculation of g consistent with the unit. 1

PUBLISHED
2(a)(i) L0 in the range 3.0–8.0 cm. 1
2(a)(ii) Percentage uncertainty based on an absolute uncertainty ΔL0 in the range 2–5 mm.
1
2(b)(i) Value of L1 > L0. 1
2(b)(ii) Correct calculation of (L1 – L0). 1
2(b)(iii) Correct calculation of k. 1
2(b)(iv) Justification of the number of significant figures linked to the number of significant figures in F and (L1 – L0). 1
2(c)(i) Raw value(s) of d and L recorded to the nearest millimetre. 1
2(c)(ii) Second values of d and L. 1
Second value of (L1 – L0) is larger than the first value of (L1 – L0). 1
2(d)(i) Two values of C calculated correctly. The final values must not be written as fractions. 1
2(d)(ii) Valid comment consistent with the calculated values of C, testing against a criterion stated by the candidate. 1
2(e) Correct calculation of W. 1

PUBLISHED
2(f)(i) A Two readings are not enough to draw a (valid) conclusion (not “not enough for accurate results”, “few readings”).
B Difficult to measure d with reason, e.g. rule falls/rule slips off/end point near mass hanger difficult to identify.
C Values of (L – L0) or (L1 – L0) are small giving large uncertainty (error)
or
large percentage uncertainty (error) in (L – L0) or (L1 – L0).
D Problem with mass of putty, e.g. mass of putty not included/putty changes force on spring.
E Difficulty to judge whether spring is vertical/to make spring vertical.
F Difficult to measure L0, L, L1 or length of spring with reason, e.g. holding rule to measure length nudges spring/coils
slanted/rule not vertical/parallax/hands unsteady.
G k determined using only one result.
4

Physics 9702 Multiple Choice Mark Schemes

Physics 9702 Multiple Choice Mark Schemes

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Physics 9702 Multiple Choice Mark Schemes