Q6 of 27 Page 93

Pick from the following one chemical used to disinfect water.

Chlorine is a very good oxidizer. It kill pathogens and germs by breaking their bonds. This is how it disinfects water.

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4

Open drain system is a breeding place for which of the following.

 5

Water polluted by various human activities causes a number of water borne diseases. Which of the following is not a water borne disease?

 7

The system of a network of pipes used for taking away wastewater from homes or public buildings to the treatment plant is known as

 8

Which of the following is a part of inorganic impurities of the sewage?