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  5. Mechanical Properties of Fluids / तरलों के यांत्रिक गुण

11th Class Physics Mechanical Properties of Fluids / तरलों के यांत्रिक गुण Question Bank Mechanical Properties of Fluids Conceptual Problems

  • question_answer
    A needle floats on the surface of pure water but goes down when detergent is added to water. Why?

    Answer:

                    Due to addition of detergent, the surface tension and hence the reaction of surface tension decreases. Hence the needle sinks due to smaller upward reaction.


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