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

Which one of the following nuclear reactions is a source of energy in the sun 

(1) ${}_4{}^9\mathrm{Be}+{}_2{}^4\mathrm{He}\to {}_6{}^{12}\mathrm{C}+{}_0{}^{-1}\mathrm{n}$

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

(3) ${}_{56}{}^{144}\mathrm{Ba}+{}_{56}{}^{92}\mathrm{Kr}\to {}_{92}{}^{235}\mathrm{U}+{}_0{}^{-1}\mathrm{n}$

(4) ${}_{26}{}^{56}\mathrm{Fe}+{}_{48}{}^{112}\mathrm{Ca}\to {}_{74}{}^{167}\mathrm{W}+{}_0{}^{-1}\mathrm{n}$

Which of the following particle has similar mass to electron

(1) Proton             

(2) Neutron

(3) Positron           

(4) Neutrino

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

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

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

Hydrogen bomb is based on which of the following phenomenon

(1) Nuclear fission             

(2) Nuclear fusion

(3) Radioactive decay       

(4) None of these

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, $1\mathrm{eV}=1.6\times {10}^{-19}<mspace\; width="1em"></mspace>\mathrm{J}$ 

(1) $6\times {10}^{18}$        

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

(3) ${10}^{17}$             

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