Q36 of 269 Page 149

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

As biogas can be prepared only in the absence of oxygen.

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34

Which one of the following is not renewable energy technology?

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The rise of sea-water during high tide is caused by the gravitational pull of the:

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The fuel which is not obtained from biomass is:

 38

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