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When drops of mercury are placed on a cl...

When drops of mercury are placed on a clean surfaces of glass , they merge and becomes single drop explain .

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The adhesive force between mercury molecules and glass molecules are weak , while cohesive force between molecule -molecule of mercury are strong .Hence ,mercury drop does not stick to the surface of glass and gathered to form a large drop .
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KUMAR PRAKASHAN-MECHANICAL PROPERTIES OF FLUIDS -SECTION -C (Objective Questions) (VSQs)
  1. Give reason why mercury does not wet glass .

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

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

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

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  5. Why surface tension of antiseptics kept less ?

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

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

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

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

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

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

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

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

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  14. How angle of contact depend on temperature ?

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

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  16. Why raincoat does not wet in rain ?

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

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

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

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  20. Why it is better to wear cotton clothes in summer ?

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