Rainbow formation involves: MCQ with Answer and Explanation

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Rainbow formation involves:

A. Reflection only

B. Refraction only

C. Dispersion and total internal reflection

D. Diffraction

Answer: Option C

Solution (By JKSSB Mock Tests)

Rainbow: sunlight enters raindrop (refraction + dispersion), reflects internally (TIR), exits with further refraction. Primary rainbow: one TIR; secondary: two TIRs. Memory tip: 'Rainbow = refraction + dispersion + TIR in water droplets'. Application question testing atmospheric optics, frequently appearing in competitive exams.

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Question #1

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Potentiometer measures EMF accurately because:

A. It has high resistance

B. Both (a) and (c)

C. It draws no current from cell

D. It uses null deflection

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Correct Answer: Option B

Explanation:
Potentiometer uses null method: at balance, no current flows through cell, so measured voltage equals true EMF (no internal resistance drop). Memory aid: 'Null method ⇒ zero current ⇒ accurate EMF measurement'. Experimental physics concept frequently tested in competitive exams to verify understanding of precision measurement techniques.

This question belongs to: Science Physics