470. 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
471. A fast breeder reactor uses following as fuel
A.Enriched uranium
B.Plutonium
C.Thorium
D.U238
472. A boiling water reactor uses following as fuel
A.Enriched uranium
B.Plutonium
C.Thorium
D.U238
473. A fast breeder reactor
A.Uses graphite rods as moderator
B.Has powerful moderator
C.Has no moderator
D.Uses ferrite material as moderator
474. Artificial radioactive isotopes find application in
A.Power generation
B.Medical field.
C.Nuclear fission
D.Nuclear fusion
475. A fast breeder reactor uses
A.90% U-235
B.U-238
C.U-235
D.Pu-239
476. 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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