1.

Name the major constituent of biogas. Write the properties of biogas which make it a good fuel. ii. Name the two devices that work using heat energy of the sun.

Answer»

Solution :(i) Methane/`CH_(4)`
Leaves no residue LIKE ash.
It burns without SMOKE.
Its heating capacity is high.
Bio-gas is ALSO used for lighting.
(ii) Solar WATER heater.
Solar cooker.


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