In a nuclear reactor, the function of a moderator is to
A. Remove heat
B. Absorb neutrons
C. Control chain reaction
D. Slow down neutrons
Answer: Option D
Solution (By JKSSB Mock Tests)
Moderator slows fast neutrons to thermal energies to increase probability of fission. Common moderators: heavy water, graphite. Control rods (cadmium, boron) absorb neutrons. Coolant removes heat.
Explanation:
Planck's constant h = E/ν. Dimensions: [ML²T⁻²]/[T⁻¹] = [ML²T⁻¹]. Angular momentum = mvr = [ML²T⁻¹]. Linear momentum [MLT⁻¹], force [MLT⁻²], energy [ML²T⁻²]. So angular momentum matches. This is a frequently asked SSC question.
No comments yet. Be the first to start the discussion!