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  4. Assertion Sometimes insects can walk on the surface of water. Reason The gravitational force on insect is balanced by force due to surface tension.

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Q. Assertion Sometimes insects can walk on the surface of water.
Reason The gravitational force on insect is balanced by force due to surface tension.

Mechanical Properties of Fluids

Solution:

Sometimes insects can walk on the surface of water due to surface tension, when legs of insects are not being wet.
In this situation, the gravitational force on insect is balanced by force due to surface tension.
Therefore, Assertion and Reason are correct and Reason is the correct explanation of Assertion.