Q37 of 54 Page 351

Which of the following statement about ozone is correct?

Ozone layer in the upper atmosphere prevents ultraviolet radiations of the sun from reaching the earth.

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35

Which of the following will be reduced in air in a city forest when a lot of dust and fly ash in emitted by a coal-based factory in the vicinity?

 36

Which of the following disease cannot be caused by drinking of river water contaminated with untreated sewage?

 38

Drinking water can be made absolutely safe by adding some:

 39

The excessive use of one of the following in agriculture can cause the death of fish in a pond by oxygen starvation. This one is: