Q7 of 16 Page 25

Which is the correct figure? Why?

Fig. B is correct.

A very thin tube act as a capillary tube. When this tube is dipped into water or any liquid in a container, then, certain amount of water forms upper meniscus into the tube. Then the adhesive force between water and tube walls increases, pulling water upwards. This is called capillary action.


So the level of water in capillary tube must be higher than water level in container.


More from this chapter

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5

The area of one end of a U-tube is 0.01 m2 and that of the other end is 1m2. When a force was applied on the liquid at the first end the force experienced at the other end is 20000 N. What is the force applied on the liquid at the first end?

 6

Write down the reason for the following:

a. Ink can be blotted with chalk.


b. Sweat can be blotted with tissue paper.

 1

Prepare a table of substances of density less than that of water.

 2

Float a knitting needle on the surface of water.