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Subjects
Science State Board
Class 8
Water
Potable Water and Water Pollution

5. Purification of water: Choose the correct answer

Exercise condition:

3 m.

1.

Select the correct sequence of the process of water purification.

Filtration → Sedimentation → Sterilisation
Filtration → Sterilisation → Sedimentation
Sedimentation → Filtration → Sterilisation
Sedimentation → Sterilisation → Filtration

2.

To speed up the sedimentation process in water purification, __________ is added.

calcium carbonate
potassium chloride
potash alum
sodium chloride

3.

The chemicals used in the sterilisation process are __________.

ozone and chlorine
ozone and potash alum
ozone and carbon dioxide
chlorine and potash alum

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