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JEE Main · 2024 · 04 Apr 2024 · Shift 2 · Fluid Mechanics

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Given below are two statements :

Statement I: The contact angle between a solid and a liquid is a property of the material of the solid and liquid as well.
Statement II : The rise of a liquid in a capillary tube does not depend on the inner radius of the tube.

In the light of the above statements, choose the correct answer from the options given below :
  1. (A)Both Statement I and Statement II are false
  2. (B)Statement I is false but Statement II is true.
  3. (C)Statement I is true but Statement II is false.✓ Correct
  4. (D)Both Statement I and Statement II are true.

Answer: (C)

Solution

Statement I is correct — the contact angle at a solid-liquid interface depends on the cohesive and adhesive forces, which are properties of both the solid and the liquid.
Statement II is incorrect — the height of capillary rise is , which clearly depends on the tube's inner radius (it is inversely proportional to ).
So Statement I is true, Statement II is false.

JEE Main · 2024 · 04 Apr 2024 · Shift 2 · Single correct option

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