A fission chain reaction in uranium can be developed

A By increasing the contents of U<sub>235</sub>
B By slowing down fast neutrons so that U<sub>235</sub> fission continues by slow neutron
C Both (A) and (B)
D None of these

Correct Answer: Both (A) and (B)

Nuclear chain reactions are series of nuclear fissions (splitting of atomic nuclei), each initiated by a neutron produced in a preceding fission.
A fission chain reaction in uranium can be developed by increasing the contents of U235 and by slowing down fast neutrons so that U235 fission continues by slow neutron.
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B Accelerating fast neutrons
C Absorbing all neutrons
D Using moderator
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A No new neutron
B At least one new neutron
C One new neutron
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A U-235
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A 0.1
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A U-235
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