Long answer·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
Design a brief viva-ready plan for an investigatory project on how the cooling rate of water depends on the exposed surface area.
Total: 6 marks
(a) State the aim and independent variable. (2 marks)
(b) State two controlled variables and the observation to be plotted. (3 marks)
(c) State one limitation or source of error. (1 mark)
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