Correct Answer : Trash pumps
Explanation : Trash pumps are a type of submersible centrifugal pump designed to handle rocks and other solids while dewatering. It is used in dewatering construction sites, mines, and utility pits.
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