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Question 30939
JEE Physics · Hard

Fluid Mechanics: Capillarity MCQ

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CapillarityHardQuestion 30939

Question

Mercury in a glass capillary tube:
  1. A
    Rises due to adhesion exceeding cohesion
  2. B
    Is depressed because cohesion exceeds adhesion
    Correct
  3. C
    Behaves same as water
  4. D
    Is always at same level

Correct answer

Is depressed because cohesion exceeds adhesion

Explanation

Mercury-glass contact angle > 90°. Mercury cohesion > mercury-glass adhesion. Result: capillary depression, not rise.

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