Chapter 3: Uncertainties, Significant Figures and SI Units

A-level PhysicsModule 1: Practical Skills7 topicsHigher

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Uncertainties, Significant Figures and SI Units: Long Answer Questions

Examiner-style long-answer practice with automatic marking, improvement advice and ProofCoach tracking.

4 questions15 marks38 min

standard / hard / synoptic

2 marksdefinestandardOCR A

Define or identify the key idea in percentage uncertainty, then explain why it matters in Uncertainties, Significant Figures and SI Units.

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3 marksexplainstandardOCR A

Proof Academy original experimental data

Condition	Measurement 1	Measurement 2	Mean
A	12.4	12.8	12.6
B	18.1	17.7	17.9
C	24.6	24.2	24.4

Using the stimulus where appropriate, explain the pattern or process involving gradient in Uncertainties, Significant Figures and SI Units.

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4 marksanalysehardOCR A

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Analyse how intercept affects the outcome in Uncertainties, Significant Figures and SI Units. Include any relevant calculation, condition, diagram feature, or limitation.

State the relevant principle for intercept.
Apply it to the data, diagram, or named example.
Give a justified conclusion.

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6 marksevaluatesynopticOCR A

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cellresistormeter

Evaluate the physical model and data for evaluation in Uncertainties, Significant Figures and SI Units. Your answer should be coherent, use precise exam-board terminology, and consider both method and evidence.

State the relevant principle for evaluation.
Apply it to the data, diagram, or named example.
Give a justified conclusion.

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2. Implementing Measurements and Apparatus

4. Graphs, Gradients, Intercepts and Evaluation

Key learning objectives

Understand the key principles behind Uncertainties, Significant Figures and SI Units.
Apply these ideas to exam-style questions.
Recall the essential definitions and key terms.