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WBCS Preliminary Examination 2017 — General Studies · Question 109 of 200

Q109
General SciencePhysics
A shaving brush is dipped in water. When taken out the hairs of the brush are seen to be drawn together due to
  1. a.surface tension of water
  2. b.viscosity of water
  3. c.elasticity of the hairs of the brush
  4. d.temperature difference between air and water

Answer: (A) surface tension of water

Surface tension causes the thin film of water clinging between the bristles to pull them together as the brush is removed from water.

Q108 Whole paperQ110
A shaving brush is dipped in water. When taken out the hairs of the… — WBCS Preliminary Examination 2017 Q109 | Prostuti360°