Give one example each for renewable and non-renewable sources of energy.

Which elements are used to make a solar cell?

The waste materials collected from a market complex are scrap paper,thermocol,vegetable waste,tin cans,and glass bottles. Which of these can be used for producing biogas? Mention three advantages of converting these into biogas rather than burning them.

Mention any two advantages and two disadvantages of producing hydroelectricity by building dams on rivers.

Enlist the energy changes taking place in a hydroelectric power station.

Why are gaseous fuels preferred to solid fuels in chemical industries?