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The surface tension is responsible for many interesting phenomenon. NAEST questions given here are related to the surface properties of the fluids.
Question: Talcum powder was displaced because,
Answer: The surface tension of the soap solution is smaller than that of water.
Question 1: The cap floats in water. In the first part, the cap comes to the edge,
Answer: Because of the surface tension
Question 2: In the second part, the cap comes at the middle of the water
Answer: Because of the surface tension
Question: Why a drop of water makes the slides stick together?
Answer: The adhesive force between glass-water and cohesive force between water-water molecules is responsible for sticking of slides. This can be explained through the phenomenon of surface tension (pressure difference created by the surface tension).