Which of the following is used as a moderator in nuclear reactor? MCQ with Answer and Explanation

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Which of the following is used as a moderator in nuclear reactor?

A. Uranium

B. Graphite

C. Cadmium

D. Boron

Answer: Option B

Solution (By JKExamLibrary)

Graphite, heavy water (D₂O), beryllium are moderators. Cadmium and boron are control rods (absorb neutrons). Uranium is fuel. Moderator slows neutrons.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

Nuclear reactor moderator function:

A. Emit neutrons

B. Absorb neutrons

C. Slow neutrons

D. Shield radiation

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Correct Answer: Option C

Explanation:
Moderator (water, graphite) slows fast neutrons to thermal energies for efficient fission in U-235. Control rods absorb neutrons to regulate reaction. Memory tip: 'Moderator = neutron slower; Control rods = neutron absorber'. Reactor component function frequently tested in competitive nuclear physics questions.

This question belongs to: Science Physics

Question #2 Report Error

The gravitational force between two masses is F. If the distance between them is halved, the force becomes

A. F/4

B. F/2

C. 2F

D. 4F

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Correct Answer: Option D

Explanation:
Newton's law of gravitation: F ∝ 1/r². If distance r becomes r/2, new force F' ∝ 1/(r/2)² = 4/r² = 4F. So force quadruples. This inverse square law is fundamental for gravitational, electric, magnetic forces.

This question belongs to: Science Physics

Question #3 Report Error

The scientist who invented the telephone was

A. Bell

B. Edison

C. Marconi

D. Tesla

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Correct Answer: Option A

Explanation:
Alexander Graham Bell patented telephone in 1876.

This question belongs to: Science Physics

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