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WBCS Preliminary Examination 2016 — General Studies · Question 108 of 200

Q108
General SciencePhysics
Water rises up a capillary tube because of
  1. a.elasticity.
  2. b.surface tension.
  3. c.viscosity.
  4. d.its density.

Answer: (B) surface tension.

Water rises in a capillary tube due to surface tension combined with the adhesive force between water molecules and the tube walls. Surface tension causes the water surface to curve upward (meniscus), and the adhesive force pulls the water up along the tube until balanced by the weight of the water column.

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Water rises up a capillary tube because of — WBCS Preliminary Examination 2016 Q108 | Prostuti360°