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321.

In the freshly produced sewage, aerobic activity is maximum.

True

False

322.

The seqage is treated by aerobic bacteria action in

A.	settling tank	B.	crickling filter
C.	oxidation pond	D.	all of these

323.

Which of the following statement is correct?

A.	Sewage, if not treated, will create healthy conditions.	B.	Secondary treatment of sewage works on hydraulic separation principle.
C.	Primary clarifiers are to the sedimentation tanks located just after the girt chambers.	D.	Trickling filter is different from percolating filter.

324.

The activated sludge

A.	contains fertilising constituents	B.	indicates the degree of aeration
C.	indicates high water content	D.	all of these

325.

Sludge treatment is mainly done in order to

A.	stablize the organic matter	B.	destroy the pathogenic bacterias
C.	reduce the water content	D.	all of these

326.

The activated sludge process of sewage treatment

A.	requires smaller area for construction of whole unit	B.	requires smaller water head for operation than trickling filters
C.	has high efficiency	D.	all of the above