Paper 5 Practical Test: Complete IGCSE Physics Guide

Use this guide to practise Paper 5 Practical Test: Complete IGCSE Physics Guide deliberately. Start with one question, apply the method, mark the evidence and retry the same skill later without notes.

The paper lasts 1 hour 15 minutes, carries 40 marks and contributes 20% of the qualification. Core and Extended candidates can take it, depending on the examination centre’s entry.

Paper 5 preparation should combine:

• supervised apparatus experience
• accurate measurement
• clear tables
• graph and gradient skills
• data analysis
• limitations and improvements
• safe working
• time management

It should not be reduced to memorising predicted experiments or stock phrases.

Confirm the practical route first

Before preparing specifically for Paper 5, confirm:

• the centre has entered the candidate for Paper 5 rather than Paper 6
• the exact component and variant code
• the current examination instructions
• the apparatus and safety expectations communicated by the centre
• the current 2026 to 2028 syllabus

The statement of entry and examination centre are the source of truth.

What does Paper 5 assess?

The practical test can require candidates to:

• follow or complete an experimental method
• assemble or adjust apparatus as instructed
• measure quantities using suitable instruments
• record raw data
• repeat readings
• calculate derived quantities
• plot and interpret a graph
• calculate a gradient or intercept
• compare results
• identify limitations
• suggest specific improvements
• draw a conclusion from evidence

The exact combination varies. Do not assume a fixed number of questions or fixed mark allocation by skill.

Apparatus familiarity

Candidates should be familiar with the general apparatus listed by Cambridge and with equipment used during the course, such as:

• rulers, metre rules and measuring tapes
• balances
• measuring cylinders
• thermometers or temperature probes
• stopwatches
• ammeters and voltmeters
• power supplies, switches and resistive components
• newton meters
• springs and masses
• optical pins, mirrors, blocks, lenses and screens
• clamps, stands and bosses

Familiarity means knowing:

• what the instrument measures
• its range and resolution
• how to zero or check it where appropriate
• how to read it without parallax
• how it is connected or positioned
• relevant safety precautions

Hands-on practice should take place under suitable school or laboratory supervision. Do not improvise mains electricity, heating, glassware, radiation sources or unfamiliar equipment at home.

Skill 1: set up methodically

Before taking readings:

1. read the complete instruction for that section
2. identify the quantity to be changed
3. identify the quantity to be measured
4. check instrument ranges and zero positions
5. arrange apparatus as shown or described
6. confirm that connections and reference points are correct
7. take a preliminary reading where appropriate
8. begin the recorded sequence

Do not start collecting data before understanding which measurements belong in the table.

Skill 2: measure from a defined reference point

Ambiguous reference points create systematic errors.

Examples:

• pendulum length: pivot to the centre of the bob
• spring extension: stretched length minus original length, using the same reference point
• lens work: positions measured from the defined lens reference point
• liquid volume: correct meniscus position
• ruler reading: scale viewed perpendicular to the reading point

State the reference point clearly when the question asks for a method.

Skill 3: use suitable precision

Precision should follow the instrument and the instructions.

Before recording, determine:

• the smallest scale division or least displayed digit
• whether interpolation is justified
• whether repeated readings should use the same decimal places
• how a calculated value should be rounded

Avoid universal rules such as “every length must end in .0” or “every stopwatch time must be to 0.1 s.” The correct recording depends on the actual apparatus shown or supplied.

Skill 4: repeat and process readings

Repeats can help assess random variation.

A sound process is:

1. repeat the reading when the method and time allow
2. compare the values
3. investigate an unexpected result
4. calculate a mean from valid readings where appropriate
5. retain enough raw data for the examiner to see the process

Repeats do not correct:

• zero error
• miscalibration
• consistent parallax
• uncontrolled temperature change
• a consistently wrong reference point

Match the action to the problem.

Skill 5: construct a correct table

A table should normally contain:

• the independent variable first
• the dependent variable after it
• quantity or symbol in the heading
• unit in the heading
• no repeated units in every cell
• consistent raw-reading precision
• columns for repeats and a mean where needed

Example:

Do not enter calculated results before checking that the raw measurements have been recorded.

Skill 6: draw and use graphs

Axes

• independent variable on the horizontal axis unless instructed otherwise
• dependent variable on the vertical axis
• quantity or symbol and unit shown

Scale

Choose a scale that:

• covers all data
• uses the grid effectively
• is simple enough for accurate plotting
• follows the question instruction

Plotting and best fit

• plot small, accurate points using the required symbol
• recheck coordinates
• draw the appropriate best-fit line or smooth curve
• do not join point to point unless instructed
• do not force a line through the origin without evidence

Gradient

Use well-separated points on the best-fit line:

$\text{gradient}=\frac{y_2-y_1}{x_2-x_1}$

Show the coordinates, differences, calculation and unit.

Skill 7: analyse a relationship

A conclusion should use the data.

For direct proportionality, look for evidence such as:

• a straight-line relationship
• an intercept consistent with the origin within experimental limitations
• a reasonably constant ratio where appropriate

Do not write “directly proportional” merely because both quantities increase.

For comparison questions:

1. calculate or quote the relevant values
2. compare numerically
3. state whether the difference is meaningful in context
4. connect the conclusion to measurement limitations where appropriate

Avoid inserting “within experimental accuracy” without showing which results support that judgment.

Skill 8: evaluate limitations and improvements

Use:

limitation → specific change → reason

Pendulum example

Limitation: Timing one oscillation gives a large percentage reaction-time uncertainty.

Change: Time many complete oscillations and divide by their number.

Reason: The reaction-time uncertainty is a smaller fraction of the longer interval.

Circuit example

Limitation: The component heats while readings are taken, changing resistance.

Change: Use a suitable low current and open the switch between readings.

Reason: This reduces temperature change and helps isolate the intended variable.

Thermal example

Limitation: Energy is transferred to the surroundings.

Change: Add appropriate insulation and a lid where the apparatus permits.

Reason: A greater fraction of the supplied energy remains in the measured system.

Optics example

Limitation: The sharpest image position is difficult to judge.

Change: Darken the surroundings where permitted, move the screen through the focus from both directions and repeat the position.

Reason: Repeated estimates reduce the effect of judgment variation.

A generic statement such as “use better equipment” is incomplete unless the instrument feature and benefit are named.

Common practical families

Candidates benefit from supervised experience across several families, while understanding that the exact examination context can differ.

Mechanics and measurement

Possible skills:

• length, mass and time
• density
• springs and moments
• oscillations
• forces and equilibrium

Thermal physics

Possible skills:

• temperature measurement
• heating or cooling data
• insulation comparisons
• control of mass, time and starting temperature

Waves and optics

Possible skills:

• reflection and refraction
• ray tracing
• lens and screen alignment
• distance and angle measurement

Electricity and magnetism

Possible skills:

• ammeter in series
• voltmeter in parallel
• current-voltage measurements
• resistance
• safe switching and avoidance of overheating

The Practical Skills Academy separates these general competencies.

Circuit practical checklist

Before switching on:

• follow the supplied circuit diagram
• check ammeter and voltmeter positions
• select suitable ranges
• confirm polarity where relevant
• keep the switch open until a reading is needed
• check that exposed conductors and connections are safe

During readings:

• monitor component heating
• open the switch between measurements where appropriate
• record current and potential difference together
• change only the intended variable

If the apparatus appears faulty or unsafe, stop and alert the supervisor.

Thermal practical checklist

Consider:

• starting temperature
• mass
• heater power and time
• insulation
• lid
• stirring
• thermometer position
• sensor response
• energy loss

Follow the supplied safety instructions for hot apparatus and liquids.

Optics practical checklist

• align object, lens and screen
• define measurement reference points
• keep pins vertical where used
• separate pins sufficiently for accurate alignment where appropriate
• use thin construction lines
• read angles from the normal where required
• avoid looking into an intense source

Follow the actual apparatus and paper instructions rather than memorising one setup.

Pendulum practical checklist

• measure pivot to centre of bob
• use a small release angle where instructed
• release without pushing
• use a consistent reference point
• time several complete oscillations
• repeat and average where appropriate
• keep motion in one plane

Define one complete oscillation consistently.

What if the equipment does not behave as expected?

• reread the setup instruction
• check obvious permitted connections and zero settings
• do not spend excessive time silently repeating the same failed step
• alert the supervisor promptly
• follow the supervisor and examination instructions
• record observations honestly

Do not invent data to match the expected relationship.

How should limited laboratory time be used?

Prioritise supervised practice that cannot be reproduced by reading alone:

• connecting and ranging meters
• reading analogue scales
• judging a sharp optical image
• measuring from defined reference points
• controlling heating
• taking repeated measurements efficiently
• recording while working
• completing a graph within the available time

Written practice should support, not replace, those skills.

A staged Paper 5 preparation cycle

Stage 1: isolated skills

• scales and precision
• tables
• repeats and means
• graphs and gradients
• limitation-improvement pairs

Stage 2: supervised experiment families

Complete several different investigations and explain the purpose of every method choice.

Stage 3: timed sections

Practise collecting and recording data under time constraints while maintaining accuracy.

Stage 4: complete components

Use authorised Cambridge papers and the matching instructions where available. Mark the written evidence and review any practical difficulty with the teacher or supervisor.

Stage 5: delayed retry

Repeat the weak skill in a different experiment to show that the correction transfers.

Do not use a fixed four-week promise or predicted experiment list as a substitute for evidence.

Exam-day routine

• bring the permitted equipment specified by the centre
• read each section before changing apparatus
• record data directly and clearly
• include units and appropriate precision
• leave enough time for graphs and evaluation
• keep the work area safe and organised
• alert the supervisor promptly about apparent faults
• follow all current instructions

The exact equipment list should come from the examination centre, not an old website checklist.

Can tutoring support Paper 5?

Online tutoring can help with:

• method planning
• table and graph work
• calculations
• evaluation
• interpreting a practical question
• analysing errors after supervised laboratory work

It cannot replace required safe hands-on experience with real apparatus.

Paper 5 rewards careful experimental reasoning, safe apparatus use and accurate written evidence. Prepare those together, then test them under supervised timed conditions.