Name the process responsible for large energy production in the sun?

What prevents us from making use of solar cell panels to meet all our domestic needs for electricity?

Explain why obtaining energy from nuclear fusion reactions is preferable to obtaining energy from nuclear fission reactions. Give two reasons.

List some advantages of solar cells.

$(a)$ Why is the solar cooker box covered with a plane glass plate?
$(b)$ Why is energy of water flowing in a river considered to be an indirect form of solar energy?
$(c)$ How is the fission of ${}^{235}U$ nucleus brought about?

Name the main constituent of biogas.