Q. A vertical glass capillary tube, open at both ends, contains some water. Which of the following shapes may be taken by the water in the tube?
A) [image:10_image39.emf]
B) [image:10_image40.emf]
C) [image:10_image41.emf]
D) [image:10_image42.emf]
Explanation
(d) For water-glass interface, the angle of contact is less than $90{^\circ}$, so the shape of liquid meniscus is concave upward on both faces
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.