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Physics-Surface Tension

NEET Physics Surface Tension MCQ Question

Type: MCQ-numerical-Easy-Class 11

What is the formula for calculating the capillary rise in a tube due to surface tension?

A

h = (2S cos θ) / (a ρ g)

B

h = (2S a) / (ρ g)

C

h = (S cos θ) / (2a ρ g)

D

h = (2S) / (a cos θ ρ g)

Correct Answer

Option A

Detailed Explanation

The formula for capillary rise is derived from the balance of pressure differences and surface tension, given by h ρ g = (2S cos θ) / a, where h is the capillary rise, S is surface tension, θ is the angle of contact, a is the radius of the tube, and ρ is the density of the liquid.

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