Which of the following is used as a moderator in nuclear reactor?
A. Graphite
B. Boron
C. Uranium
D. Cadmium
Answer: Option A
Solution (By JKSSB Mock Tests)
Graphite, heavy water (D₂O), beryllium are moderators. Cadmium and boron are control rods (absorb neutrons). Uranium is fuel. Moderator slows neutrons.
Explanation:
v = c/n = 3×10⁸/2 = 1.5×10⁸ m/s. Direct refractive index application. Memory tip: 'Higher n ⇒ slower light; v = c/n'. Optics calculation frequently tested in competitive exams.
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