Question

Liquid will rise in capillary tube if angle of contact is

• A. acute
• B. obtuse
• C. equal to $90^{\circ }$
• D. always

Answer 1

Answer: (A)

If the angle of contact $\theta$ is acute (i.e., $\theta <90^{\circ })$, liquid will rise in a capillary tube. If the angle of contact $\theta$ is obtuse (i.e., $\theta >90^{\circ })$, liquid will fall in a capillary tube