Q2 of 17 Page 158

Now-a-days, every motor vehicle is subjected to a `pollution under control' (PUC) test. Find out why this test is done.

Pollution under control test is done to:

i. Monitor the harmful pollutant emit by the vehicles.


ii. The harmful pollutants may include Sulphur dioxide, carbon dioxide etc.


iii. This test helps in maintaining such pollutants.


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3

Fill in the blanks

Solid carbon dioxide is also called …………..

 4

Match the following.

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Who am I?

(a) I am found in clouds and mist.


(b) I am used in aerated drinks.


(c) I am used in an electric bulb.


(d) I form 78% of air.


(e) I am used in the production of nitric acid.

 1

Find out which ingredients used in baked products make them light and porous.