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

In a nuclear fission reaction 

(1) Two light nuclei combine to produce a heavier nucleus

(2) A light nucleus bombarded by thermal neutrons breaks up

(3) A heavy nucleus bombarded by thermal neutrons breaks up

(4) A heavy nucleus breaks up by itself

Hydrogen bomb is based on which of the following phenomenon

(1) Nuclear fission             

(2) Nuclear fusion

(3) Radioactive decay       

(4) None of these

The number of neutrons released when ${}_{92}\mathrm{U}_{235}$ undergoes fission by absorbing ${}_0{}^1\mathrm{n}$ and $\left({}_{56}{}^{144}\mathrm{Ba}+{}_{36}{}^{89}\mathrm{Kr}\right)$are formed, is 

(1) 0           

(2) 1

(3) 2         

(4) 3

Which of the following particle has similar mass to electron

(1) Proton             

(2) Neutron

(3) Positron           

(4) Neutrino

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

To generate a power of 3.2 mega watt, the number of fissions of ${\mathrm{U}}^{235}$ per minute is
(Energy released per fission = 200MeV, $1\mathrm{eV}=1.6\times {10}^{-19} \mathrm{J}$ 

(1) $6\times {10}^{18}$        

(2) $6\times {10}^{17}$

(3) ${10}^{17}$             

(4) $6\times {10}^{16}$

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

In an atomic bomb, the energy is released due to

(1) Chain reaction of neutrons and ${}_{92}{}^{235}\mathrm{U}$
(2) Chain reaction of neutrons and ${}_{92}{}^{288}\mathrm{U}$
(3) Chain reaction of neutrons and ${}_{92}{}^{240}\mathrm{P}$
(4) Chain reaction of neutrons and ${}_{92}{}^{286}\mathrm{U}$