Question

Which among the following are commercial sources of energy?

(a) Solar energy

(b) Animal wastes

(c) Agricultural wastes

(d) Wood

The question was posed to me in an international level competition.

I'm obligated to ask this question of Water Hammer in Pipes in division Flow Through Pipes of Fluid Mechanics

Answer 1

Right option is (a) Solar energy

For explanation I would say: Solar energy is a commercial source of energy among the following options. All energy sources that serve a commercial purpose are called as commercial sources of energy. Some good examples are Solar, tidal, wind, geothermal, wave etc.