The ratio of radii of nuclei ${}_{13}{}^{27}\mathrm{Al}$ and ${}_{52}{}^{\mathrm{A}}\mathrm{X}$ is 3 : 5. The number of neutrons in the nuclei of X will be
1. 52             

2. 73

3. 125             

4. 13

In nuclear fission 0.1% mass is converted into energy. How much electrical energy can be generated by the fission of 1kg of fuel?

1.  1 kWh

2.  10⁷ kWh

3.  2.5 kWh

4.  2.5$\times$10⁷ kWh

 If in a nuclear fusion process the masses of the fusing nuclei be ${\mathrm{m}}_1$ and ${\mathrm{m}}_2$ and the mass of the resultant nucleus be $m_3$, then 

(1) ${\mathrm{m}}_3={\mathrm{m}}_1+{\mathrm{m}}_2$         

(2) ${\mathrm{m}}_3=\left|{\mathrm{m}}_1+{\mathrm{m}}_2\right|$

(3) ${\mathrm{m}}_3<\left({\mathrm{m}}_1+{\mathrm{m}}_2\right)$       

(4) ${\mathrm{m}}_3>\left({\mathrm{m}}_1+{\mathrm{m}}_2\right)$

Heavy water is

(1) Water at 4$°\mathrm{C}$

(2) Compound of deuterium and oxygen

(3) Compound of heavy oxygen and heavy hydrogen

(4) Water in which soap does not lather

The nuclear reaction ${}_1{}^2\mathrm{H}+{}_1{}^2\mathrm{H}\to {}_2{}^4\mathrm{He}$ (mass of deuteron = 2.0141 a.m.u. and mass of He = 4.0024 a.m.u.) is

(1) Fusion reaction releasing 24 MeV energy

(2) Fusion reaction absorbing 24 MeV energy

(3) Fission reaction releasing 0.0258 MeV energy

(4) Fission reaction absorbing 0.0258 MeV energy

The average number of prompt neutrons produced per fission of ${\mathrm{U}}^{235}$ is 

(1) More than 5         

(2) 3 to 5

(3) 2 to 3                 

(4) 1 to 2

Neutrino is a particle, which is 

(1) Charged and has spin

(2) Charged and has no spin

(3) Charge less and has spin

(4) Charge less and has no spin

Hydrogen bomb is based on which of the following phenomenon

(1) Nuclear fission             

(2) Nuclear fusion

(3) Radioactive decay       

(4) None of these

Which of these is a fusion reaction 

(1) ${}_1{}^3\mathrm{H}+{}_1{}^2\mathrm{H}\to {}_2{}^4\mathrm{He}+{}_0{}^1\mathrm{n}$

(2) ${}_{92}{}^{238}\mathrm{U}\to {}_{82}{}^{206}\mathrm{Pb}+8\left({}_2{}^4\mathrm{He}\right)+6\left({}_{-1}{}^0\mathrm{\beta }\right)$

(3) ${}_7{}^{12}\mathrm{C}\to {}_6{}^{12}\mathrm{C}+{\mathrm{\beta }}^{+}+\mathrm{\gamma }$

(4) None of these

${}_1{}^1\mathrm{H}+{}_1{}^1\mathrm{H}+{}_1{}^2\mathrm{H}\to \mathrm{X}+{}_1{}^0\mathrm{e}$ energy. The emitted particle is

(1) Neutron                 

(2) Proton

(3) $\mathrm{\alpha }$ particle               

(4) Neutrino