505. Which of the following are ferrite materials
A.U233 and pu239
B.U238 and Th232
C.U238 and pu239
D.U238 and Th239
506. Ferrite material is
A.The most fissionable material
B.The basic fuel for nuclear paints
C.Basic raw material for nuclear plants
D.The material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material
507. Which of the following particles is the lightest
A.Nucleus
B.Electron
C.Proton
D.Meson
508. Which of the following is the heaviest
A.Neutron
B.Proton
C.Atom
D.Electron
509. In fast breeder reactors
A.Any type of moderator can be used
B.Moderator is dispensed with.
C.Heavy water is used as the moderator
D.Moderator may or may not be used
510. In nculear fission each neutron that causes fission releases
A.No new neutron
B.At least one new neutron
C.One new neutron
D.More than one new neutrons
511. The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is
A.Same
B.Lower
C.Higher
D.Unity
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