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KVPY2017PhysicsMechanical Properties of Fluids

Consider a bowl filled with water on which some black pepper powder have been sprinkled uniformly. Now a drop of liquid soap is added at the centre of the surface of water. The picture of the surface immediately after this will look like

Correct answer

2

Step-by-step solution

due to soap bubble surface tension is reduced therefore in that area. Black paper powder will sink.

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