Statement A: Free surface of a liquid behaves like a stretched elastic membrane, but doesn’t obey Hooke’s law.
Statement B: For a liquid to wet a solid, the angle of contact between the solid and liquid should be obtuse

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A true and B false

both A and B false

both A and B are true

A false and B true

answer is A.

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Detailed Solution

Free surface of a liquid behaves like a stretched elastic membrane due to the property of surface tension. The molecules in the liquid experience a force which acts equally for its neighboring molecules. However this cohesive force pulls the molecules on the surface inwards. Due to this unbalanced force, the top surface of a liquid behaves like stretched membrane. It doesn't follow Hooke's law.

To wet the solid with liquid, angle of contact should be acute.

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