The unit of latent heat of fusion is MCQ with Answer and Explanation

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The unit of latent heat of fusion is

A. J/kg

B. J

C. W

D. J/°C

Answer: Option A

Solution (By JKSSB Mock Tests)

Latent heat per unit mass, Q = mL => L = Q/m, unit J/kg (or cal/g). Specific latent heat. Not per degree.

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Question #1

Interference demonstrates light's:

A. Both

B. Particle nature

C. Neither

D. Wave nature

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Correct Answer: Option D

Explanation:
Interference (constructive/destructive superposition) is wave phenomenon. Young's double-slit confirmed light's wave nature. Particle nature shown by photoelectric effect. Memory aid: 'Interference/diffraction ⇒ wave; photoelectric ⇒ particle'. Wave-particle duality frequently tested in competitive exams.

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Question #2

Assertion (A): It is easier to pull a lawn roller than to push it. Reason (R): Pushing increases the apparent weight of the roller, thereby increasing the frictional force.

A. A is true but R is false.

B. Both A and R are true but R is NOT the correct explanation of A.

C. Both A and R are true and R is the correct explanation of A.

D. A is false but R is true.

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Correct Answer: Option C

Explanation:
When you pull a roller at an upward angle, the vertical component of the applied force acts strictly upwards, reducing the normal reaction (N = mg - Fsin_theta) and thus reducing friction (muN). When you push it at a downward angle, the vertical component adds to the weight (N = mg + Fsin_theta), increasing the normal reaction and consequently increasing the rolling friction.

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Question #3

An electron and a proton are accelerated through the exact same potential difference. Which particle will acquire a greater kinetic energy?

A. The electron

B. The proton

C. Depends on their initial velocities

D. Both will acquire the exact same kinetic energy

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Correct Answer: Option D

Explanation:
The work done by the electric field on a charged particle is completely converted into kinetic energy. Work = q * V, where q is the magnitude of the charge and V is the potential difference. Since both an electron and a proton have the exact same magnitude of charge (e = 1.6 x 10^-19 C), they acquire identical kinetic energy (eV).

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