The largest producer of bauxite in the world is:

Where we found natural gas resources in India?

Which one of the following is important besides coal for iron industry?

Which one of the following cells convert sunlight directly into electricity?

From which minerals does silicon obtain?

The statements I and II are explanatory notes.
I.Multipurpose projects are built over the rivers to prevent soil erosion and floods.
II. Hirakud and Rihand are built in India
Which option decribes better about the above statements?  

Which one of the following may occur in association with petroleum?

Which one of the following gives much smoke and little heat on burning?

Which one of the following is hazardous to health?

Which one of the following constitutes about 65% of the total electricity generated in India?