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Coefficient of Viscosity

The end of a ...

Question

The end of a capillary tube is immersed into a liquid. Liquid slowly rises in the tube up to some height. Then, the capillary - fluid system

A

Will absorb heat

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B

Will release heat

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C

Will not be involved in any heat transfer

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D

Nothing can be said

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Solution

The correct option is B Will release heat
As the liquid rises in the capillary tube, mechanical energy is stored in it. But due to viscosity/frictional force, some energy is dissipated as heat.

So, due to viscous nature of the liquid, capillary - fluid system will release heat.

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