JEE Main 2024 Physics 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.
Answer: (A)
Solution
No rise or fall means cos θ = 0, i.e. a contact angle of 90°, not 0°, so Statement-I is false; Statement-II is true.