Use limitations to improve the next experiment
A useful improvement addresses a specific limitation in the method. The next design should explain how the change improves the evidence.
Follow the reasoning
- Name the dominant source of uncertainty or bias.
- Propose a practical change aimed at that source.
- Explain why the resulting measurements should be more useful.
Try it in a past paper 5
Open the question, then use its mark scheme to check your work.
Question 22
Evaluate a refractive-index identification and describe an accurate critical-angle measurement.
Build the supporting skills. Practise Evaluating and Planning before exploring this connection. This question has not been checked as a combined example of the connection.
Question 1
Find train deceleration and stopping distance, then evaluate the motion model.
Build the supporting skills. Practise Evaluating before exploring this connection. This question has not been checked as a combined example of the connection.
Question 4(b)
Design a potentiometer experiment to compare cell e.m.f.s.
Build the supporting skills. Practise Planning before exploring this connection. This question has not been checked as a combined example of the connection.
Question 19
Combine measurement uncertainties for electrical energy.
Build the supporting skills. Practise Evaluating before exploring this connection. This question has not been checked as a combined example of the connection.
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Question 23(a)
Plan measurements and a circuit for a thermistor investigation.
Build the supporting skills. Practise Planning before exploring this connection. This question has not been checked as a combined example of the connection.
A curated collection checked against the question papers and mark schemes; not a complete past-paper catalogue. Links open official OCR PDFs in a new tab.
Put the ideas to work
More practice is on its way
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Specification outcomes (4)
- 1.1.4(c) Limitations in experimental procedures.
- 1.1.4(e) Refining experimental design by suggesting improvements to procedures and apparatus.
- 1.1.1(a) Experimental design, including to solve problems set in a practical context.
- 1.1.1(c) Evaluation that an experimental method is appropriate to meet the expected outcomes.