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JEE Main · 2024 · 05 Apr 2024 · Shift 1 · Fluid Mechanics

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Given below are two statements :

Statement-I: When a capillary tube is dipped into a liquid, the liquid neither rises nor falls in the capillary. The contact angle may be .
Statement-II: The contact angle between a solid and a liquid is a property of the material of the solid and liquid as well :
In the light of above statement, choose the correct answer from the options given below.
  1. (A)Statement-I is false but Statement-II is true.✓ Correct
  2. (B)Both Statement-I and Statement-II are true.
  3. (C)Both Statement-I and Statement-II are false.
  4. (D)Statement-I is true and Statement-II is false.

Answer: (A)

Solution

Capillary rise is . For , , so and the liquid rises; it does not stay level. Zero rise would need . So Statement-I is false. The contact angle does depend on the nature of both the solid and the liquid (adhesive vs cohesive forces), so Statement-II is true. Statement-I false, Statement-II true.

JEE Main · 2024 · 05 Apr 2024 · Shift 1 · Single correct option

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