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MHT CET2019Morning ShiftPhysicsMechanical Properties of FluidsActual

A molecule of water on the surface

Options

  1. ADownward resultant unbalanced adhesive force
  2. BUpward resultant unbalanced cohesive force
  3. CDownward resultant unbalanced cohesive force
  4. DUpward resultant unbalanced adhesive force

Correct answer

C. Downward resultant unbalanced cohesive force

Step-by-step solution

A molecule on the surface experiences a net force (Cohesive force) in downward direction due to net number of molecules pulling it in the downward direction (molecule A as shown in figure underneath). In contrast, a molecule well inside is equally pulled in all directions by molecules around at (molecule B as shown in figure)

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