Test Preparation on Gate Civil Environmental Engineering Paper-3

Which one of the following is not bacteria from sewage and animal excrement?

Sphere-shaped bacteria are called

B. coli or E. coli are harmless organisms but their presence in water indicates the

Bacteria that need oxygen to live are known as

Bacteria that survive in the absence of oxygen are known as

Bacteria that can live and multiply with or without oxygen are called

Bacteria that can survive between 40°C to 65°C are known as

Aeration is carried out to

Ion transfer takes place by means of

Floatation is a method of water purification by