MHT CET 2025 Physics question

The liquid (mercury) meniscus in capillary tube will be convex if the angle of contact is

(A)greater than Correct
(B)less than
(C)equal to
(D)equal to

Answer: (A)

Solution

When the angle of contact is obtuse () the liquid does not wet the glass, cohesion exceeds adhesion, and the surface curves downward in the middle, i.e. the meniscus is convex (as for mercury, ) and the liquid is

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Question ID VK-103214