$A$ nuclear reaction is accompanied by a loss of mass equivalent to $0.01864 \; amu$. The energy liberated is .......... $MeV$.

If the binding energy per nucleon of $_1H^2$ is $x$ and that of $_2He^4$ is $7x$,then the ratio of the energy liberated in the reaction $_1H^2 + _1H^2 \to _2He^4$ to the binding energy per nucleon of $_1H^2$ is:

The number of neutrons in the parent nucleus which gives $N^{14}$ on $\beta$-emission and the parent nucleus is

If the mass defect of ${ }_{5}B^{11}$ is $0.081 \ u$,its average binding energy (in $MeV$) is

Which of the following is the most stable atom?

In the radioactive disintegration series ${}_{90}^{232}Th \rightarrow {}_{82}^{208}Pb$ involving $\alpha$ and $\beta$ decay,the total number of $\alpha$ and $\beta$ particles emitted are: