A) nuclear fuel
B) neutron absorber
C) a moderator
D) neutron liberator to start the chain
Correct Answer: B
Solution :
Key Idea: [a] Nuclear fuel- Enriched \[{{U}^{235}}\] in form of\[{{U}_{3}}{{O}_{8}}\] [b] Neutron absorber- Cd or B rods. [c] A moderator\[-{{D}_{2}}O\] or graphite. Neutrons are absorbed by Cd or B rods to control the reaction. \[\therefore \] [b] is correct answer.
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