SSC CGL (Prelims) General: Metals and Non-metals questions with solutions

Q1. Why is aluminium widely used in aircraft construction?

1. High density
2. Corrosion resistance and light weight
3. Low melting point
4. Magnetic properties

Answer: Corrosion resistance and light weight

Aluminium is preferred in aircraft because it has low density, which reduces the overall weight of the aircraft, and it resists corrosion due to the protective oxide layer formed on its surface. These properties improve fuel efficiency and durability.