Which of the following sources of energy is different from the other?

Energy from various sources is considered to have been derived from the sun. Do you agree? Justify your answer.

What is the basic cause for winds to blow? Name a part of India where wind energy is commercially harnessed. Compare wind power and power of water flow in respect of generating mechanical and electrical energies. What is the hindrance in developing them?

Compare the advantages of generating energy from biomass with those of generating it from a hydropower plant.

Why is the floating gas holder type biogas plant considered less advantageous than the fixed dome-type biogas plant? Give reasons.

What is biogas? How can biogas be obtained? Why is the use of biogas obtained from cow dung advised in preference to burning cow dung cakes?