Properties and uses of some metals

2 marks · Hard

Aluminium is often chosen for the bodies of aircraft. Explain two reasons, based on its physical properties, for this choice.

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Also accept: Aluminium has a low density, so it is lightweight, and it resists corrosion.

Common mistakes: Giving 'aluminium is cheap' or 'aluminium conducts electricity' (not a key use for aircraft bodies).

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Marking points

B1 · 1 mark · One correct property of aluminium relevant to aircraft (e.g., low density/lightweight, resists corrosion, strong when alloyed).

B2 · 1 mark · Second correct property, different from first.

Worked solution

Aluminium is used because it has a low density, making the aircraft lightweight, and it resists corrosion, so the body does not rust.