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Question 11 Mark
Name the following :

The two types of devices commonly used for removing the particulate air pollutants.

Answer
Scrubber, Plate type electrostatic precipitator
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Question 21 Mark
Name the following :

The solid precipitated material produced during secondary treatment of the effluent carried out in the effluent treatment plants.

Answer
Sludge
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[1 Mark Question Answer] - BIOLOGY STD 9 Questions - Vidyadip