Q134 / 160 · AP EAMCET 2007 · Physics

A liquid does not wet the solid surface if the angle of contact is

  • A
    zero
  • B
    equal to $45^{\circ}$
  • C
    equal to $90^{\circ}$
  • Correct answer
    D
    greater than $90^{\circ}$

Solution

A liquid does not wet the solid surface if the angle of contact is obtuse ie, greater than $90^{\circ}$. In this case cohesive forces will be greater than adhesive forces and so, the liquid does not wet the surface of solid.

Hence, the correct answer is option: 'D'.

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