What is the most important characteristic of a good fuel?

What constitutes a source of energy?

Explain how the energy of fossil fuels is ultimately derived from the sun.

Why do we need alternative sources of energy?

Minimum velocity of wind required for a functional windmill is about:

What is biomass? Name the reaction that takes place in the biogas plant. Write the main constituents of biogas. List two reasons for considering biogas an ideal fuel for domestic use.