Cambridge International AS & A Level

PHYSICS 9702/33
Paper 3 Advanced Practical Skills 1 October/November 2022

CONFIDENTIAL INSTRUCTIONS
* 7 7 7 4 8 6 1 9 7 1 *

This document gives details of how to prepare for and administer the practical exam.

The information in this document and the identity of any materials supplied by Cambridge International
are confidential and must NOT reach candidates either directly or indirectly.

The supervisor must complete the report at the end of this document and return it with the scripts.

INSTRUCTIONS
● If you have any queries regarding these confidential instructions, contact Cambridge International
stating the centre number, the syllabus and component number and the nature of the query.
email info@cambridgeinternational.org
phone +44 1223 553554

This document has 8 pages.

DC (LK/CT) 302767/3
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General information about practical exams

Centres must follow the guidance on science practical exams given in the Cambridge Handbook.

Safety

Supervisors must follow national and local regulations relating to safety and first aid.
Only those procedures described in the question paper should be attempted.
Supervisors must inform candidates that materials and apparatus used in the exam should be treated
with caution. Suitable eye protection should be used where necessary.

Before the exam

● The packets containing the question papers must not be opened before the exam.
● It is assumed that standard school laboratory facilities, as indicated in the Guide to Planning
Practical Science, will be available.
● Spare materials and apparatus for the tasks set must be available for candidates, if required.

During the exam

● It must be made clear to candidates at the start of the exam that they may request spare materials
and apparatus for the tasks set.
● Where specified, the supervisor must perform the experiments and record the results as instructed.
This must be done out of sight of the candidates, using the same materials and apparatus as the
candidates.
● Any assistance provided to candidates must be recorded in the supervisor’s report.
● If any materials or apparatus need to be replaced, for example, in the event of breakage or loss,
this must be recorded in the supervisor’s report.

After the exam

● The supervisor must complete a report for each practical session held and each laboratory used.
● Each packet of scripts returned to Cambridge International must contain the following items:
– the scripts of the candidates specified on the bar code label provided
– the supervisor’s results relevant to these candidates
– the supervisor’s reports relevant to these candidates
– seating plans for each practical session, referring to each candidate by candidate number
– the attendance register.

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Specific information for this practical exam

The supervisor must be a teacher of physics or other competent physicist who is familiar with the
requirements of this syllabus. During the exam, the supervisor (not the invigilator) should obtain a
sample set of numerical results by following the relevant steps in the question paper. The results
should be clearly labelled ‘supervisor’s results’ and recorded on the supervisor’s report or on a
spare copy of the question paper.

Organisation of the exam

● The number of sets of apparatus provided for each experiment should be 12 N, where N is the
number of candidates taking the exam.
● Candidates must not be provided with any additional apparatus beyond that specified in these
instructions.
● Candidates should be allowed access to the apparatus for each experiment for one hour only.
● After spending one hour on one experiment, candidates should change over to the other
experiment.
● The order in which a candidate attempts the two experiments is immaterial.

Assistance to candidates

● Candidates should be informed that, if they find themselves in real difficulty, they may ask the
supervisor for practical assistance, but that the extent of this assistance will be reported to the
examiner, who may not award full credit for the relevant skills.
● Assistance should only be given when it is asked for by a candidate or where apparatus is seen to
have developed a fault.
● Assistance should be restricted to enabling candidates to make observations and measurements.
Observations and measurements must not be made for candidates, and no help should be given
with data analysis or evaluation.
● In cases of faulty apparatus that prevent the required measurements from being taken, the
supervisor should allow extra time to give the candidate a fair opportunity to perform the experiment
as if the fault had not been present.
● Any assistance or extra time given to candidates must be recorded in the supervisor’s report.

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Materials and apparatus for Question 1 (per set of apparatus unless otherwise specified)

● 3 V d.c. power supply (e.g. two 1.5 V dry cells) with terminals.

● Digital voltmeter set to the range 0–20 V reading to the nearest 0.01 V or better. If a digital
multimeter is used, the range should be fixed and any unused terminals should be covered.

● 210 cm length of 30 swg (0.315 mm diameter) nichrome wire. See Note 1 and Note 2.

● Wooden strip of length 95.0 cm and approximate cross-section 2 cm × 1 cm. See Note 1.

● Nail of approximate length 2 cm. See Note 1.

● Metre rule with a millimetre scale.

● Seven connecting leads.

● 22 Ω resistor in a component holder labelled 22 Ω. See Note 3.

● Two crocodile clips. See Note 4.

● Small container for the crocodile clips.

● Switch.

● Micrometer screw gauge (shared between at most three candidates).

Notes

1 The nail should be hammered centrally into the wooden strip at a distance of 1.0 cm from the end.
The nail should not protrude through the lower surface, as shown in Fig. 1.1.

1.0 cm

nail

2 cm

1 cm

wooden strip

Fig. 1.1 (not to scale)

The wire should be securely attached to the nail and wrapped around the wooden strip.
The wire should be secured with tape along the entire lower surface of the strip and around the
strip as shown in Fig. 1.2.

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1 cm

wire
tape
wire

tape on
lower surface

Fig. 1.2 (not to scale)

2 If this wire is not available, other resistance wire of approximate resistance 15 Ω m–1 may be used.
Details of the wire used must be recorded in the supervisor’s report.

3 The resistor should have a maximum tolerance of 5% and a minimum power rating of 0.25 W,
e.g. RS Components stock number 386-666.

4 The jaws of the crocodile clips should be cleaned so that they make a good electrical contact with
the resistance wire.

5 The apparatus should be laid out on the bench. If the apparatus is to be used by another candidate,
then it should be dismantled and restored to its original state.

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Materials and apparatus for Question 2 (per set of apparatus unless otherwise specified)

● Stand.

● Clamp.

● Boss.

● 100 g mass hanger.

● 100 g slotted mass.

● Paper clip of approximate length 5 cm.

● 250 cm3 cooking oil in a 250 cm3 beaker.

● Four M12 steel nuts, e.g. RS Components stock number 530-078.

● Four M16 steel nuts, e.g. RS Components stock number 275-670.

● Two small containers for the nuts, lined with paper towels.

● Two paper towels.

● Stop-watch reading to 0.1 s or better.

● Two expendable springs each with approximate outside diameter 15 mm, approximate coiled length
20 mm and approximate spring constant 25 N m–1 (e.g. Philip Harris product code B8G87194).
See Note 1.

● 30 cm ruler with a millimetre scale.

● Access to a balance reading to 0.1 g or better (shared between at most four candidates).

Notes

1 The two springs should be looped together, as shown in Fig. 2.1.

springs

Fig. 2.1

2 The apparatus should be laid out on the bench. If the apparatus is to be used by another candidate,
then it should be restored to its original state. The nuts, paper clip and paper towels should be
replaced.

Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every
reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the
publisher will be pleased to make amends at the earliest possible opportunity.

To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge
Assessment International Education Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download
at www.cambridgeinternational.org after the live examination series.

Cambridge Assessment International Education is part of Cambridge Assessment. Cambridge Assessment is the brand name of the University of Cambridge
Local Examinations Syndicate (UCLES), which is a department of the University of Cambridge.

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Supervisor’s report
Syllabus and component number /

Centre number

Centre name ............................................................................................................................................

Time of the practical session ...................................................................................................................

Laboratory name/number ........................................................................................................................

Give details of any difficulties experienced by the centre or by candidates (include the relevant
candidate names and candidate numbers).

You must include:

● any difficulties experienced by the centre in the preparation of materials
● any difficulties experienced by candidates, e.g. due to faulty materials or apparatus
● any specific assistance given to candidates.

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Declaration
1 Each packet that I am returning to Cambridge International contains all of the following items:
● the scripts of the candidates specified on the bar code label provided
● the supervisor’s results relevant to these candidates
● the supervisor’s reports relevant to these candidates
● seating plans for each practical session, referring to each candidate by candidate number
● the attendance register.
2 Where the practical exam has taken place in more than one practical session, I have clearly
labelled the supervisor’s results, supervisor’s reports and seating plans with the time and laboratory
name/number for each practical session.
3 I have included details of difficulties relating to each practical session experienced by the centre or
by candidates.
4 I have reported any other adverse circumstances affecting candidates, e.g. illness, bereavement or
temporary injury, directly to Cambridge International on a special consideration form.

Signed ................................................................................................................................. (supervisor)

Name (in block capitals) ..........................................................................................................................

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