547. 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 (e) none of the above.
D.(c) 2 neutrons

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548. A fast breeder reactor uses following as fuel
A.Enriched uranium
B.Plutonium
C.Thorium
D.U238

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

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550. 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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551. Artificial radioactive isotopes find application in
A.Power generation
B.Medical field.
C.Nuclear fission
D.Nuclear fusion

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552. A fast breeder reactor uses
A.90% U-235
B.U-238
C.U-235
D.Pu-239

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553. Half life of a radioactive isotope corresponds to the time required for half of the following to decay
A.Electrons
B.Atom.
C.Neutrons
D.Nulceus

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