Civil Engineering - Waste Water Engineering

31. 

In 1000 kg of sewage, the total solids approximate

A. 0.5 to 1.0 kg
B. 1 kg to 2.0 kg
C. 5 kg to 7.5 kg
D. 7.5 kg to 10 kg.

Answer: Option A

Explanation:

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32. 

Pathogens (or pathogentic bacterias) in water may cause

A. typhoid
B. cholera
C. dysentery
D. infectious hepatitis
E. all the above.

Answer: Option E

Explanation:

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33. 

Sewer manholes are generally provided at

A. the change of gradient
B. the change of direction
C. the junctions of sewers
D. all of these.

Answer: Option D

Explanation:

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34. 

The sewers

A. must be of adequate size to avoid over flow
B. must flow under gravity to full
C. must be laid at least 2 to 3 m deep to collect /water from the basements
D. all the above.

Answer: Option D

Explanation:

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35. 

Before discharging the foul sewage into rivers, it is generally treated by

A. screening
B. sedimentation
C. oxidation
D. sludge digestion and disinfection
E. all the above.

Answer: Option E

Explanation:

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