The gas which occurs above the petroleum oil trapped under the rocks is called :
(a) biogas
(b) petroleum gas
(c) natural gas
(d) coal gas
Which of the following is not a fossil fuel?(a) coal(b) petroleum gas(c) biogas(d) natural gas
One of the following is not an exhaustible source of energy. This one is :
(a) natural gas.
(c) coal gas
(d) biogas
Which of the following fuels has the highest calorific value ?
(a) natural gas
(b) liquefied petroleum gas
(d) hydrogen gas