Dispersion occurs because: MCQ with Answer and Explanation

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Dispersion occurs because:

A. Prism absorbs colors

B. Different frequencies

C. Different colors have different speeds in medium

D. TIR occurs

Answer: Option C

Solution (By JKSSB Mock Tests)

n varies with λ ⇒ v = c/n varies ⇒ different refraction angles (Snell's law). Frequency constant; wavelength changes in medium. Memory aid: 'Dispersion: n(λ) ⇒ v(λ) ⇒ different bending; violet bends most'. Optics concept frequently tested in competitive exams.

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Question #1

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Carnot efficiency η = 1 - T₂/T₁. If T₁=600K, T₂=300K, η is:

A. 100%

B. 50%

C. 75%

D. 25%

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Correct Answer: Option B

Explanation:
η = 1 - 300/600 = 1 - 0.5 = 0.5 = 50%. Maximum possible efficiency for given temperatures. Memory aid: 'η_Carnot = 1 - T_cold/T_hot; always < 100%'. Thermodynamics calculation frequently tested in competitive exams.

This question belongs to: Science Physics