The unit of latent heat is MCQ with Answer and Explanation

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The unit of latent heat is

A. W

B. J/kg

C. J

D. J/°C

Answer: Option B

Solution (By JKSSB Mock Tests)

Latent heat per unit mass, so Q = mL, L = Q/m, unit J/kg (or cal/g). Specific latent heat of fusion/vaporization. Heat required for phase change without temperature change.

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Question #1

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The instrument used to view distant objects is

A. Endoscope

B. Microscope

C. Telescope

D. Periscope

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Correct Answer: Option C

Explanation:
Telescope (refracting/reflecting) makes distant objects appear nearer, magnified. Microscope for tiny near objects. Periscope uses mirrors to see over obstacles. Endoscope medical.

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Question #2

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Prism dispersion occurs because:

A. Refractive index depends on wavelength

B. Total internal reflection

C. Different colors have different frequencies

D. Prism absorbs colors selectively

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Correct Answer: Option A

Explanation:
Dispersion: n varies with λ (Cauchy's law), causing different refraction angles for colors. Frequency constant across media; wavelength changes. Memory aid: 'n(λ) ⇒ v(λ) ⇒ different bending; violet bends most'. Conceptual question testing dispersion mechanism, frequently examined in competitive optics sections.

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