Correct Answer : Drum pumps
Explanation : End suction pumps are the common type of centrifugal pump. It has a horizontal shaft with an overhung impeller. The flow goes in the end of the casing, and out the top.
Correct Answer : Option (B) : Eutrophication
Explanation : Eutrophication is the growth of huge amounts of algae and other aquatic plants leading to the deterioration of water quality. The untreated wastewater is rich in organic matter which demands oxygen.
Correct Answer : Option (C) : 20°C
Correct Answer : Option (D) : All of the above