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9.2 , surface tension — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics9.2 , surface tension1 Mark
MCQ
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 :

  • A
    Both Statement $I$and Statement $II$ are false
  • B
    Statement $I$ is false but Statement $II$ is true.
  • ✓
    Statement $I$ is true but Statement $II$ is false.
  • D
    Both Statement $I$ and Statement $II$ are true.
✓

Answer

Correct option: C.
Statement $I$ is true but Statement $II$ is false.
c
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 option $(3)$ is correct.

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