The phenomenon of radioactivity arises from the

Which one of the following statements is correct?

The nuclear binding energy for $Ar$ $(39.962384 \, amu)$ is ......... $MeV.$ (Given: mass of proton $= 1.007825 \, amu$,mass of neutron $= 1.008665 \, amu$)

Radioactivity of the neptunium series stops when it is converted to:

In a nuclear reactor,the chain reaction is controlled by introducing:

India conducted an underground nuclear test at