Q77 / 90 · JEE Main 2024 (04 Apr Shift 2) · Physics

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:

  • Correct answer
    A
    Statement I is true but Statement II is false.
  • B
    Statement I is false but Statement II is true.
  • C
    Both Statement I and Statement II are false.
  • D
    Both Statement I and Statement II are true.

Solution

Statement I is correct as we know contact angle depends on cohesine and adhesive forces. Statement II is incorrect because height of liquid is given by $h==\frac{2 T \cos \theta_C}{\rho g r}$ where $r$ is radius of Tube (assuming length of capillary is sufficient).

Hence, the correct answer is option: 'A'.

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