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MHT CET20225 Aug 2022Morning ShiftPhysicsMechanical Properties of FluidsActual

Which one of the following statements is 'NOT' True about the angle of contact of a liquid?

Options

  1. AAny increase in the temperature of the liquid does not decrease its angle of contact.
  2. BIf an impurity is added in the liquid then it's angle of contact changes.
  3. CAngle of contact depends upon the nature of liquid and solid in contact.
  4. DAt a given temperature, the angle of contact is constant for a solid-liquid surface.

Correct answer

A. Any increase in the temperature of the liquid does not decrease its angle of contact.

Step-by-step solution

The correct option is (A). Concept: Contact angle decreases with the increasing temperature. Addition of impurity decreases the surface tension of liquid. Contact angle depends on the nature of liquid and solid in contact. Therefore, answer (A) is the only "NOT" true statement. Concept based question.

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