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Pond skaters walk on the surface of wate...

Pond skaters walk on the surface of water. Give reason for it.

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When the insect rests on a liquid surface, the vertical component of surface tension balances the weight of the insect. The surface of liquid acts as a stretched ciastic membrane.
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SUBHASH PUBLICATION-MECHANICAL PROPERTIES OF FLUIDS-TWO MARK QUESTIONS AND ANSWERS
  1. If 'H' is the height of liquid in a cylindrical container and 'h' is t...

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  2. For what value of 'h' of orifice below the jet the range will be maxim...

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  3. What is magnus effect ?

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  4. Name the two types molecular forces.

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  5. Water sticks to glass whereas mercury does not. Explain.

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  6. Distinguish between cohesive and adhesive forces.

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  7. Give any two illustrations of surface tension.

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  8. Pond skaters walk on the surface of water. Give reason for it.

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  9. Explain the action of detergents.

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  10. When it is raining, it is not advised to resist water drops falling on...

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  11. What is meant by surface energy? Give the expression for surface energ...

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  12. Give the expression for the energy evolved, when the surface area of t...

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  13. Give the expression for the excess pressure in a soap bubble.

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  14. Give the expression for the excess pressure across curved surfaces fac...

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  15. Give the expression for the excess pressure across curved surfaces fac...

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  16. State Newton's law of viscosity of fluids in motion.

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  17. Give Stokes formula and explain the symbols used.

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  18. Give an expression for the terminal speed of a small spherical object ...

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  19. What is meant by critical velocity of a liquid? Explain the characteri...

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  20. State Stokes law.

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