Rainbow formation involves: MCQ with Answer and Explanation

Rainbow formation involves:

A. Reflection only

B. Dispersion and total internal reflection

C. Refraction only

D. Diffraction

Answer: Option B

Solution (By JKExamLibrary)

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.

This question belongs to: Science Physics

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The buoyant force on a body immersed in a fluid depends on

A. Both B and C

B. Volume of body

C. Acceleration due to gravity

D. Density of body

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Correct Answer: Option A

Explanation:
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This question belongs to: Science Physics

Question #2 Report Error

The device that converts AC to DC is

A. Rectifier

B. Oscillator

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Correct Answer: Option A

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Question #3 Report Error

A lactometer measures

A. Purity of milk

B. Temperature of milk

C. Density of milk

D. Viscosity of milk

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Correct Answer: Option A

Explanation:
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This question belongs to: Science Physics

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