During the nuclear fusion reaction 

(1) A heavy nucleus breaks into two fragments by itself

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

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

(4) Two light nuclei combine to give a heavier nucleus and  possibly other products

Fusion reaction takes place at high temperature because

(1) Atoms are ionised at high temperature

(2) Molecules break-up at high temperature

(3) Nuclei break-up at high temperature

(4) Kinetic energy is high enough to overcome repulsion between nuclei

In nuclear fission, the fission reactions proceeds with a projectile. Which of the following suits the best

(1) Slow proton             

(2) Fast neutron

(3) Slow neutron         

(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

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

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

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 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

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