GK
BASIC GENERAL KNOWLEDGE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Free surface of a liquid behaves like a sheet and tends to contract to the smallest possible area due to the
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force of cohesion
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centrifugal force
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force of friction
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force of adhesion
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Explanation:
Detailed explanation-1: -Free surface of a liquid behaves like a sheet and tends to contract to the smallest possible area due to the force of cohesion. The force of cohesion is defined as the force of attraction between molecules of the same substance.
Detailed explanation-2: -Therefore, a liquid surface always tends to have a minimum surface area due to the property of surface tension.
Detailed explanation-3: -This is due to the attractive force between the water molecules that make them stick to each other rather than to spread out. When a liquid is exposed to the air, it behaves like a stretched membrane as the water molecules are attracted to each other. This property of liquid is also called Surface tension.
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