Questions in nuclei

Select	Question
	The average number of prompt neutrons produced per fission of ${U^{235}}$is
	In the nuclear reaction: $X(n,\,\alpha ){\,_3}L{i^7}$ the term X will be 3
	In an atomic bomb, the energy is released due to
	If an electron and a positron annihiliate, then the energy released is
	The binding energy per nucleon of deuterium and helium atom is 1.1 MeV and 7.0 MeV. If two deuterium nuclei fuse to form helium atom, the energy released is
	The energy liberated on complete fission of 1 kg of $_{92}{U^{235}}$ is (Assume 200 MeV energy is liberated on fission of 1 nucleus)
	Which one of the following statements about uranium is correct
	In nuclear fission the percentage of mass converted into energy is about
	In a material medium, when a positron meets an electron both the particles annihilate leading to the emission of two gamma ray photons. This process forms the basis of an important diagnostic procedure called
	The nuclear reaction $^2H{ + ^2}H \to {\,^4}He$ (mass of deuteron = 2.0141 a.m.u. and mass of He = 4.0024 a.m.u.) is