$A$ hydrogen bomb is based on which of the following phenomena?

Thermal neutrons can cause fission in

By which process is the energy released from the Sun?

In a nuclear fusion process,if the masses of the reactant nuclei are $m_1$ and $m_2$,and the mass of the resulting nucleus is $m_3$,then which of the following is true?

Nuclear fusion is common to the pair:

Mention the disadvantages of the nuclear reactor.