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Why free surface of liquid tend to contr...

Why free surface of liquid tend to contract their surface ?

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The molecules of surface of liquid experiences force in downward .Their potential energy is large .Every system tends to reduce their potential energy .Hence some of molecules goes in liquid from the surface .So ,the intermolecular forces acting between the molecules of surface and free tend to contract.
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KUMAR PRAKASHAN-MECHANICAL PROPERTIES OF FLUIDS -SECTION -C (Objective Questions) (VSQs)
  1. What is magnus effect ?

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  2. Give reason why mercury does not wet glass .

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  3. Why free surface of liquid tend to contract their surface ?

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  4. When drops of mercury are placed on a clean surfaces of glass , they m...

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  5. Give reason why are some insects able to walk on water surface ?

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  6. Why surface tension of antiseptics kept less ?

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  7. Explain why is hot soup more testy than the colder one ?

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  8. It is better to wash clothes in hot water than in cold water .Explain ...

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  9. Detergents is added to water for removing dirt from clothes.Explain .

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  10. Why colours and lubricating oil have less surface tension ?

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  11. Arrange the following liquids in increasing order of surface tension ....

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  12. If a liquid does wet the surface ,its angle of contact is acute or obt...

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  13. Liquid is stick to the glass then angle of contact for liquid glass wi...

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  14. On what factors does the value of angle of contact depend ?

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  15. How angle of contact depend on temperature ?

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  16. Why tefllon is coated ,the angle of contact between oil and non -stick...

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  17. Why raincoat does not wet in rain ?

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  18. Water rises to a height of 20 mm in a capillary . If the radius of th...

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  19. How the oil lamp produces light through a wick that is lit using a mat...

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  20. Why the moisture is retained in soil when a farm is being plough ?

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