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
548. A fast breeder reactor uses following as fuel
A.Enriched uranium
B.Plutonium
C.Thorium
D.U238
549. A boiling water reactor uses following as fuel
A.Enriched uranium
B.Plutonium
C.Thorium
D.U238
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
551. Artificial radioactive isotopes find application in
A.Power generation
B.Medical field.
C.Nuclear fission
D.Nuclear fusion
552. A fast breeder reactor uses
A.90% U-235
B.U-238
C.U-235
D.Pu-239
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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