What are the fuels used in atomic power plants called?

$A$ student constructed a box-type solar cooker. He found that it did not work efficiently. Give any four possible mistakes in the construction and operation of the solar cooker.

Mention the minimum wind velocity required for obtaining electric power with a windmill generator.

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

There are about $50$ teachers in a school and most of them come to school by their own cars. Many of the teachers come from the same place but everyone prefers to come to school by his/her own car.
Answer the following questions based on the above information:
$(a)$ Do you think that their practice of commuting to school is environmental-friendly? Give one suggestion. Justify your answer.
$(b)$ In what other two ways can we become environmental-friendly?

List two non-conventional sources of energy.