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Why the refill of marker pen which is us...

Why the refill of marker pen which is used to write on white board is made of fibers ?

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The ink has to move against the force of gravity while writing with such pen on the board .In fiber refil the ink moves due to capillary phenomena in the fiber made capillary and so it can be used to write flowlessly on board .
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KUMAR PRAKASHAN-MECHANICAL PROPERTIES OF FLUIDS -SECTION -C (Objective Questions) (VSQs)
  1. Why tefllon is coated ,the angle of contact between oil and non -stick...

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  2. Why raincoat does not wet in rain ?

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

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

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

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

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

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

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

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

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

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  12. Non -viscous flow can be a streamline.

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

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

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

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

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

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

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

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  20. Assertion : A needle placed carefully placed on the surface of water m...

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