Given below are two statements : Statement I : The contact angle … - Vidyadip

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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