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NEET2004PhysicsMechanical Properties of FluidsActual

Assertion : Smaller drops of liquid resist deforming forces better than the larger drops. Reason : Excess pressure inside a drop is directly proportional to its surface area.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion
  3. CIf assertion is true but reason is false
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false

Step-by-step solution

The excess pressure inside the small drop is large as compared to the large drop because of which smaller drop of liquid resists deforming force better than the large drop. Excess pressure = 2 T r where T= surface tension r= radius of liquid drop. Therefore excess pressure is inversely proportional to its radius and hence the surface area.

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