Which of the following is not a fossil fuel? (a) LPG (b) Natural gas (c) Biogas (d) CNG
(c) Biogas Biogas does not require millions of years to form. Therefore, it is not a fossil fuel.
Which of the following is not a fossil fuel?(a) coal(b) petroleum gas(c) biogas(d) natural gas
Which of the following fuels has the lowest calorific value ?
(a) kerosene
(b) CNG
(c) biogas
(d) LPG
One of the following is not an exhaustible source of energy. This one is :
(a) natural gas.
(b) petroleum gas
(c) coal gas
(d) biogas