Q38 of 269 Page 149

The non-renewable source of energy among the following is :

Natural gas is a fossil fuel which is a non-renewable source.

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36

One of the following is not required in the formation of biogas in a biogas plant. This is:

 37

The fuel which is not obtained from biomass is:

 39

Geothermal energy is produced by the:

 40

The harnessing of which of the following leads to the destruction of large eco-systems?