Q6 of 16 Page 25

Write down the reason for the following:

a. Ink can be blotted with chalk.


b. Sweat can be blotted with tissue paper.

These phenomena occur due to capillary action. The ink rises up in the capillaries found within a piece of chalk, i.e. the nooks and crevices in the structure of a piece of chalk. Same goes for sweat and tissue paper. A piece of tissue paper has several paths within itself which act as capillaries.

Sweat rises up in these capillaries and gets absorbed.


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4

A body of weight 1000 N sinks in water. The weight of the liquid overflowed is 250 N.

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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?

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Which is the correct figure? Why?

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