Which of the following is the least polluting fuel for vehicles?

What is the product of decomposition of animal and plant waste in the absence of air?

Which gas is obtained during the processing of coal?

Which was used in railway engines to produce steam to run the engines in earlier days?

Find the odd one out.
Petrol, Bitumen, Kerosene, CNG

Coal tar is used in the manufacturing of which of the following products?

Naphthalene balls are obtained from which of the following materials?

Where was the world's first oil well drilled?

Which of the following is not a renewable source of energy?

What is the slow process of conversion of dead vegetation into coal called?