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
A group wants to study how temperature affects evaporation rate. They will test one liquid at a time and repeat the same temperature plan for three liquids. Design a fair project plan.
Total: 4 marks
(a) State the independent variable for each liquid's run. (1 mark)
(b) State two control variables. (1 mark)
(c) State what measurement will be recorded. (1 mark)
(d) State one safety or reliability precaution. (1 mark)
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