In a nuclear reactor, heavy water is used as MCQ with Answer and Explanation

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In a nuclear reactor, heavy water is used as

A. Coolant

B. Fuel

C. Moderator

D. Control rod

Answer: Option C

Solution (By JKExamLibrary)

Heavy water (D₂O) slows neutrons, good moderator.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

A photon of energy 3.3 eV has frequency approximately (h=4.14×10⁻¹⁵ eV s)

A. 8×10¹⁴ Hz

B. 3×10⁸ Hz

C. 1.25×10¹⁵ Hz

D. 5×10¹⁴ Hz

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Correct Answer: Option A

Explanation:
f = E/h = 3.3 / 4.14×10⁻¹⁵ ≈ 8×10¹⁴ Hz.

This question belongs to: Science Physics

Question #2 Report Error

The buoyant force on an object immersed in a fluid depends on

A. Density of the fluid and volume of displaced fluid

B. Shape of the container

C. Depth of immersion

D. Density of the object

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Correct Answer: Option A

Explanation:
Buoyant force = weight of displaced fluid = ρ_fluid × V_displaced × g. Independent of depth (if fluid incompressible) and object's density, though object density determines if it floats. Shape affects volume displaced when floating.

This question belongs to: Science Physics

Question #3 Report Error

Work moving charge on equipotential surface:

A. qV

B. Zero

C. Path dependent

D. Infinite

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Correct Answer: Option B

Explanation:
Equipotential: ΔV = 0 ⇒ W = qΔV = 0. Electric field perpendicular to equipotentials. Memory aid: 'Equipotential: no work to move charge along it'. Electrostatics concept frequently tested in competitive exams.

This question belongs to: Science Physics

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