Case study·Standard multi-step (3/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
During practical viva, an examiner asks a student to defend a graph-based experiment, identify a possible source of error, and explain why repeated readings were taken.
Total: 5 marks
(a) What should the student say about repeated readings? (1 mark)
(b) How should the slope be reported from a best-fit graph? (1 mark)
(c) Give one source of random error and one source of systematic error. (2 marks)
(d) Why is a memorised final answer alone weak in viva? (1 mark)
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