What is also known as 'Black ore'?

1. Limonite
2. Haematite
3. Magnetite
4. None of the above.

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

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

Which of the following is one of the chief iron ore exporting ports in India?

1. Paradip
2. Haldia
3. Mormugao
4. Kandla

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

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