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Question 30938
JEE Physics · Hard

Fluid Mechanics: Surface Tension MCQ

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

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Surface TensionHardQuestion 30938

Question

A needle floats on water surface due to:
  1. A
    Buoyancy force
  2. B
    Surface tension supporting its weight
    Correct
  3. C
    It is hollow inside
  4. D
    Water's high density only

Correct answer

Surface tension supporting its weight

Explanation

Steel needle (density > water) is supported by the surface tension force along the contact line when placed gently. The curved meniscus provides upward force.

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