The $\mathrm{\alpha }$-particle is the nucleus of an atom of

(1) Neon             

(2) Hydrogen

(3) Helium           

(4) Deuterium

If m, ${\mathrm{m}}_{\mathrm{n}}$ and ${\mathrm{m}}_{\mathrm{p}}$ are the masses of ${}_{\mathrm{Z}}\mathrm{X}_{\mathrm{A}}$ nucleus, neutron and proton respectively 

(1) $\mathrm{m}<\left(\mathrm{A}-\mathrm{Z}\right){\mathrm{m}}_{\mathrm{n}}+{\mathrm{Zm}}_{\mathrm{p}}$       

(2) $\mathrm{m}=\left(\mathrm{A}-\mathrm{Z}\right){\mathrm{m}}_{\mathrm{n}}+{\mathrm{Zm}}_{\mathrm{p}}$

(3) $\mathrm{m}=\left(\mathrm{A}-\mathrm{Z}\right){\mathrm{m}}_p+{\mathrm{Zm}}_{\mathrm{n}}$        

(4) $\mathrm{m}>\left(\mathrm{A}-\mathrm{Z}\right){\mathrm{m}}_{\mathrm{n}}+{\mathrm{Zm}}_{\mathrm{p}}$

${\mathrm{M}}_{\mathrm{n}}$ and ${\mathrm{M}}_{\mathrm{P}}$ represent mass of neutron and proton respectively. If an element having atomic mass M has N-neutron and Z-proton, then the correct relation will be

(1) $\mathrm{M}<\left[{\mathrm{NM}}_{\mathrm{n}}+{\mathrm{ZM}}_{\mathrm{p}}\right]$         

(2) $\mathrm{M}>\left[{\mathrm{NM}}_{\mathrm{n}}+{\mathrm{ZM}}_{\mathrm{p}}\right]$

(3) $\mathrm{M}=\left[{\mathrm{NM}}_{\mathrm{n}}+{\mathrm{ZM}}_{\mathrm{p}}\right]$         

(4) $\mathrm{M}=\mathrm{N}\left[{\mathrm{M}}_{\mathrm{n}}+{\mathrm{M}}_{\mathrm{p}}\right]$

If a ${\mathrm{H}}_2$ nucleus is completely converted into energy, the energy produced will be around

(1) 1 MeV               

(2) 938 MeV

(3) 9.38 MeV           

(4) 238 MeV

On the bombardment of neutron with Boron. $\mathrm{\alpha }$-particle is emitted and product nuclei formed is

(1) ${}_6\mathrm{C}_{{}_{12}}$         

(2) ${}_3\mathrm{Li}_6$

(3) ${}_3\mathrm{Li}_7$           

(4) ${}_4\mathrm{Be}_9$

As compared ${}_{12}\mathrm{C}$ atom, ${}_{14}\mathrm{C}$ atom has

(1) Two extra protons and two extra electrons

(2) Two extra protons but no extra electrons

(3) Two extra neutrons and no extra electrons

(4) Two extra neutrons and two extra electrons

The force acting between proton and proton inside the nucleus is 

(1) Coulombic             

(2) Nuclear

(3) Both                       

(4) None of these

Which of the following isotopes is normally fissionable ?

(1) ${}_{92}\mathrm{U}_{238}$             

(2) ${}_{93}\mathrm{Np}_{239}$

(3) ${}_{92}\mathrm{U}_{235}$             

(4) ${}_2\mathrm{He}_4$

For a nucleus to be stable, the correct relation between neutron number N and Proton number Z is

(1) N > Z             

(2) N = Z 

(3) N < Z             

(4) N$\ge$Z

The average kinetic energy of the thermal neutrons is of the order of 

(1) 0.03 eV         

(2) 3 eV 

(3) 3 KeV           

(4) 3 MeV