36. In nuclear fission
A.The original elements change into completely different elements
B.The electrons of the element change
C.The molecules rearrange themselves to form other molecules
D.None of the above

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37. Reflector in nuclear plants is used to
A.Return the neutrons back into the core
B.ShIeld the radioactivity completely
C.Check pollution
D.Conserve energy

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38. A fast breeder reactor uses following as fuel
A.Enriched uranium
B.Plutonium
C.Thorium
D.U235

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39. A boiling water reactor uses following as fuel
A.Enriched uranium
B.Plutonium
C.Thorium
D.U238

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40. A fast breeder reactor
A.Uses graphite rods as moderator
B.Has powerful moderator
C.Has no moderator
D.Uses ferrite material as moderator

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41. Breeder reactor has a conversion ratio of
A.Unity
B.More than unity
C.Less than unity
D.Zero

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42. The energy required to be applied to a radioactive nucleus for the emission of a neutron is
A.1 MeV
B.2.4 MeV
C.4.3 MeV
D.7.8 MeV

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