Case study·Hard exam skill (4/5)·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 workshop cuts a steel sheet of length 25 cm25\text{ cm}, breadth 12 cm12\text{ cm}, and thickness 0.40 mm0.40\text{ mm}. The density of steel is 7.8 g cm37.8\text{ g cm}^{-3}.
Total: 4 marks

(a) Convert the thickness to centimetre. (1 mark)

(b) Find the volume in cm3\text{cm}^3. (1 mark)

(c) Find the mass of the sheet in gram. (1 mark)

(d) Express the mass in kilogram. (1 mark)

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