Amount of charcoal produced on the destructive distillation of $1 \, kg$ of wood is about: (in $, kg$)

Mention any two ways by which water can be used to produce hydroelectricity.

In a hydroelectric power plant,more electrical power can be generated if water falls from a greater height because:

Why are fossil fuels classified as non-renewable sources of energy? What steps should be taken to conserve these sources?

Why can wind energy farms be established only at specific locations? Give reasons to support your answer.

Write true or false for the following statement:
Glass cover in a solar heating device allows the short wavelength of ultraviolet radiations to enter the solar cooker.