Properties and uses of some metals
2 marks · NormalState two reasons why aluminium is widely used for making aircraft bodies.
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Also accept: lightweight; forms a protective oxide layer; strong (when alloyed); good strength-to-weight ratio
Common mistakes: aluminium is cheap; aluminium is magnetic
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Marking points
B1 · 1 mark · States that aluminium is low density OR lightweight.
B2 · 1 mark · States that aluminium resists corrosion OR forms a protective oxide layer.
Worked solution
Aluminium is widely used for aircraft bodies because:
1. It has a low density, making it lightweight.
2. It resists corrosion due to its protective oxide layer.