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Water does not wet an oily glass because...

Water does not wet an oily glass because

A

cohesive force of oil ` gt` adhesive force between oil and glass

B

cohesive force of oil ` gt` cohesive force of water

C

oil repels water

D

cohesive force of water ` gt` adesive force between water and oil molecules

Text Solution

Verified by Experts

The correct Answer is:
D
Cohesive force of water is greater than adhesive force and hence water does not wets the surface.
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DC PANDEY-FLUID MECHANICS-Taking it together
  1. Coatings used on raincoat are waterproof because they

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  2. Small droplets of liquid are usually more spherical in shape than larg...

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  3. Water does not wet an oily glass because

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  4. Which of the fact is not due to surface tension

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  5. On mixing the salt in water, the surface tension of water will

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  6. If two identical mercury drops are combined to form a single drop, the...

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  7. A water proofing agent chages the angle of contact from

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  8. Along a streamline,

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  9. In a streamline flow

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  10. A viscous fluid is flowing through a cylindrical tube. The velocity di...

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  11. Which of the following diagrams does not represent a streamline flow?

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  12. A body measures 5 N in air and 2 N when put in water. The buoyant forc...

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  13. The reading of a spring balance when a block is suspended from it in a...

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  14. A hole is made at the bottom of the tank filled with water (density =1...

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  15. An iron block is on a boat which floats in a pond. The block is thrown...

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  16. The correct curve between the height or depression h of liquid in a ca...

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  17. When two capillary tubes of different diameters are dipped vertically,...

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  18. The liquid in the capillary tube will rise if the angle of contact is

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  19. The surface tension of liuid at its boiling point

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  20. When the temperature increased the angle of contact of a liquid

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