Rainbow is formed due to MCQ with Answer and Explanation

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Rainbow is formed due to

A. Diffraction

B. Comet

C. Total internal reflection

D. Dispersion and internal reflection

Answer: Option D

Solution (By JKSSB Mock Tests)

Rainbow is formed by dispersion, refraction, and internal reflection of sunlight in water droplets. Two refractions and one internal reflection give primary bow. Secondary bow has two internal reflections. Not diffraction.

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Question #1

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The primary principle behind the working of a potentiometer is that the potential drop across any length of a uniform wire carrying a constant steady current is:

A. Inversely proportional to its length.

B. Independent of its length.

C. Directly proportional to its length.

D. Directly proportional to the square of its length.

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Correct Answer: Option C

Explanation:
A potentiometer uses a long wire of uniform cross-section and composition. When a constant steady current flows through it, Ohm's law (V = IR) and the resistance formula (R = rhoL/A) combine to give V = I(rho/A)L. Since I, rho, and A are constant, the potential drop V is strictly directly proportional to the length L of the wire.

This question belongs to: Science Physics