Name the best quality of iron that contains more than 70 per cent of iron.

1. Magnetite
2. Limonite
3. Haematite
4. Ironite

About 90 per cent of iron ore is used to make ……………. .

1. Bauxite
2. Steel
3. Brass
4. Bronze

Manganese is used to make which ore tough and resistant to rusting?

1. copper
2. mica
3. bauxite
4. iron

Assertion (A): Aluminium is the best material for telescopes.

Reason (R): Aluminium is lightweight, strong and rust resistant metal.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R does not explain A.
3. A is true but R is false.
4. A is false but R is true.