In a nuclear reactor, control rods are made of materials that:
A. Emit neutrons
B. Moderate neutrons
C. Reflect neutrons
D. Absorb neutrons
Answer: Option D
Solution (By JKSSB Mock Tests)
Control rods (made of cadmium, boron, or hafnium) absorb neutrons to regulate the fission chain reaction rate. Inserting rods deeper reduces neutron population, slowing reaction; withdrawing them increases reaction rate. Moderators (water, graphite) slow neutrons to thermal energies for efficient fission. Memory aid: 'Control rods = neutron absorbers; Moderators = neutron slowers'. This application question tests knowledge of reactor components, common in competitive exams. Always distinguish roles: fuel (fissionable material), moderator, control rods, coolant.
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