Que 1. What type of reactions occur inside the Sun which produces solar energy? Ans. The nuclear...

Que 1. What is the use of the black painted surface in solar heating devices? Ans. Black colour i...

Que 1. Firewood is a conventional fuel. List any four reasons for replacing it with alternate source...

Que  1. Give the construction and working of a solar cooker.  Ans. A device that u...