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Why raincoat does not wet in rain ?...

Why raincoat does not wet in rain ?

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The angle of contact between water and the material of the raincoat is obtuse .Therefore , the raincoat does not wet in the rain .
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KUMAR PRAKASHAN-MECHANICAL PROPERTIES OF FLUIDS -SECTION -C (Objective Questions) (VSQs)
  1. How angle of contact depend on temperature ?

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

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  3. Why raincoat does not wet in rain ?

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

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

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

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

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  8. Why the refill of marker pen which is used to write on white board is ...

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  9. Why does the water rise in a capillary tube Explain .

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  10. Why does the mercury fall in a capillary tube ?

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  11. A 20 cm long capillary tube is dipped in water The water rises upto 8 ...

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  12. In incompressible flow the density of a fluid changes with time and po...

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  13. Non -viscous flow can be a streamline.

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  14. In a steady flow velocity of the fluid at each point remains identical...

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  15. The Bernoulli equation can be considered to be a statement of the cons...

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  16. The angle of contact between drop of water and material of raincoat is...

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  17. Absence of roughness between two consecutive layers of fluid is the vi...

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  18. If the weight of body is greater than the buoyant force of liquid then...

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  19. Velocity of water at the depth in river is always slow.

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  20. Assertion : For turbulent flow Reynolds number R(e)gt2000. Reason ...

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