Resources present in unlimited quantity in nature and are not likely to be exhausted by human activities are called.

Naphthalene balls used to repel moth and insect is derived from

The slow process of conversion of dead vegetation into coal is called

In India petroleum deposit was first found in the state of

To reduce fuel consumption in automobile one should

Which of the following is obtained from coal tar?

The first oil well was drilled in

PCRA stands for

When coal burns in air then

Purest form of carbon is