The binding energy of deuteron ${}_1{}^2\mathrm{H}$ is 1.112 MeV per nucleon and an $\mathrm{\alpha }$-particle ${}_2{}^4\mathrm{He}$ has a binding energy of 7.047 MeV per nucleon. Then in the fusion reaction ${}_1{}^2\mathrm{H}+{}_1{}^2\mathrm{H}\to {}_2{}^4\mathrm{He}+\mathrm{Q}$, the energy Q released is

(1) 1 MeV             

(2) 11.9 MeV

(3) 23.8 MeV         

(4) 931 MeV

Binding energy of a nucleus is:
(1) Energy given to its nucleus during its formation

(2) Total mass of nucleus converted to energy units

(3) Loss of energy from the nucleus during its formation

(4) Total K.E. and P.E. of the nucleons in the nucleus

Which of the following pairs is an isobar 

(1) ${}_1\mathrm{H}_1$ and ${}_1\mathrm{H}_2$               

(2) ${}_1\mathrm{H}_2$ and ${}_1\mathrm{H}_3$

(3) ${}_6\mathrm{C}_{12}$ and ${}_6\mathrm{C}_{13}$              

(4) ${}_{15}\mathrm{P}_{30}$ and ${}_{14}\mathrm{Si}_{30}$

Equivalent energy of mass equal to 1 a.m.u. is

(1) 931 KeV               

(2) 931 eV

(3) 931 MeV               

(4) 9.31 MeV

The mass number of a nucleus is equal to the number of

(1) Electrons it contains           

(2) Protons it contains

(3) Neutrons it contains           

(4) Nucleons it contains

In ${}_{88}\mathrm{Ra}_{226}$ nucleus, there are 
(1) 138 protons and 88 neutrons

(2) 138 neutrons and 88 protons

(3) 226 protons and 88 electrons

(4) 226 neutrons and 138 electrons

Outside a nucleus 

1. Neutron is stable

2. Proton and neutron both are stable

3. Neutron is unstable

4. Neither neutron nor proton is stable

Order of magnitude of density of uranium nucleus is (${\mathrm{m}}_{\mathrm{P}}=1.67\times {10}^{-27} \mathrm{kg}$)
(1) ${10}^{20} \mathrm{kg}/{\mathrm{m}}^3$           

(2) ${10}^{17} \mathrm{kg}/{\mathrm{m}}^3$

(3) ${10}^{14} \mathrm{kg}/{\mathrm{m}}^3$           

(4) ${10}^{11} \mathrm{kg}/{\mathrm{m}}^3$

Nucleus of an atom whose atomic mass is 24 consists of

(1) 11 electrons, 11 protons and 13 neutrons

(2) 11 electrons, 13 protons and 11 neutrons

(3) 11 protons and 13 neutrons

(4) 11 protons and 13 electrons