Fresh sewage is __________ in nature.

During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.

A

Filtration

B

Digestion

C

Sedimentation

D

Both B and C

Fine grit present in sewage is removed in the __________ during sewage treatment.

A

Grit chamber

B

Detritus tank

C

Trickling filter

D

Skimming tank

__________ substances present in sewage are removed in grit chamber during sewage treatment.

A

Organic

B

Fatty

C

Inorganic

D

Dissolved

Fresh domestic sewage is __________ in color.

A

Grey

B

Dark brown

C

Red

D

Black

Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is?

A

Centrifugal pump

B

Pneumatic ejector

C

Reciprocating pump

D

None of these

Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is

A

H₂

B

CH₄

C

CO₂

D

N₂

Which of the following pumps is used to pump sewage solids with liquid sewage without clogging the pump is?

A

Centrifugal pump

B

Pneumatic ejector

C

Reciprocating pump

D

None of these

The characteristics of fresh and septic sewage respectively are

A

Acidic and alkaline

B

Alkaline and acidic

C

Both acidic

D

Both alkaline

The pH value of fresh sewage is usually

A

Equal to 7

B

More than 7

C

Less than 7

D

Equal to zero

Fresh sewage is generally

A

Alkaline

B

Acidic

C

Highly decomposed

D

A source of objectionable odour

Fresh sewage is __________ in nature.

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