Question

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 0°.
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.

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

Answer 1

The Correct Option is A

Capillary rise is given by:

\[ h = \frac{2T \cos \theta}{\rho g r} \]

If \(\theta = 0^\circ\), the rise is non-zero, so Statement-I is incorrect. Statement-II is correct as the contact angle depends on the materials involved.