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Question 30990
JEE Physics · Hard

Fluid Mechanics: Surface Tension Advanced MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Surface Tension AdvancedHardQuestion 30990

Question

Contact angle of 90° means:
  1. A
    Liquid fully wets surface
  2. B
    No spreading, no capillary rise or depression
    Correct
  3. C
    Mercury-like behaviour
  4. D
    Water-like behaviour

Correct answer

No spreading, no capillary rise or depression

Explanation

At θ = 90°, cosθ = 0. Capillary rise h = 2Tcosθ/(ρgr) = 0. No rise or depression. Liquid meniscus is flat.

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