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Fluid Mechanics: Capillarity Advanced MCQ

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Capillarity AdvancedHardQuestion 30999

Question

Jurin's law states that capillary rise is inversely proportional to tube radius. This fails for very narrow tubes because:
  1. A
    Surface tension changes
  2. B
    Pressure inside tube drops below vapour pressure
  3. C
    Contact angle cannot be maintained in very narrow tube
    Correct
  4. D
    Gravity reverses

Correct answer

Contact angle cannot be maintained in very narrow tube

Explanation

In very narrow tubes, the simple cylindrical meniscus assumption breaks down and the contact angle changes, deviating from Jurin's law.

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