Which particles bring about the fission of uranium-235?

What type of nuclear reaction is responsible for the liberation of energy:

(a) In a nuclear reactor?

(b) In the sun?

Which product of the nuclear fission of uranium-235 is utilized to cause further fission of its nuclei?

State whether the fission of uranium-235 is caused by low energy neutrons or high energy neutrons.

Name the type of nuclear reaction which is involved in the working of:

(a) A hydrogen bomb.

(b) An atom bomb.