Physics-Surface Tension

NEET Physics Surface Tension MCQ Question

Type: MCQ-diagram based-Medium-Class 11

Consider a vertical glass plate partially submerged in water, forming an angle of contact due to surface tension, as described in the NCERT. What is the relationship between the contact angle θ and the forces of attraction between the liquid and the solid surface?

Question diagram
A

A smaller contact angle indicates stronger attraction between liquid and solid.

B

A larger contact angle indicates stronger attraction between liquid and solid.

C

The contact angle is independent of the attraction between liquid and solid.

D

A smaller contact angle indicates weaker attraction between liquid and solid.

Correct Answer

Option A

Detailed Explanation

A smaller contact angle means the liquid is more strongly attracted to the solid, which decreases the solid-liquid surface energy.

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