Environmental Engineering (3160611) MCQs

MCQs of Sewage : Characteristics, Treatment and Disposal

Showing 21 to 27 out of 27 Questions
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21.

The temperature affects the

(a)

biological activity of bacterias in sewage
(b)

viscosity of sewage
(c)

solubility of gases in sewage
(d)

all the above.
Answer:

Option (d)

22.

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.
Answer:

Option (a)

23.

The flow velocity in detritus tanks is

(a)

0.05 m/sec
(b)

0.09 m/sec
(c)

1.25 m/sec
(d)

none of these.
Answer:

Option (b)

24.

The following is the physical characteristic of sewage

(a)

turbidity
(b)

colour
(c)

odour
(d)

all the above.
Answer:

Option (d)

25.

Acid regression stage of sludge digestion at a temperature 21°C extends over a period of

(a)

15 days
(b)

30 days
(c)

60 days
(d)

90 days.
Answer:

Option (d)

26.

If the pH value of sewage is 7

(a)

it is acidic
(b)

it is alkaline
(c)

it is neutral
(d)

none of these.
Answer:

Option (c)

27.

Pick up the correct statement from the following :

(a)

Hydrogen sulphide gas in excess, may cause corrosion of concrete sewers
(b)

4 ppm of Dissolved Oxygen (D.O.) is ensured before discharging the treated sewage in river
(c)

Solubility of oxygen in sewage is 95% of that of distilled water
(d)

All of above
Answer:

Option (d)

Showing 21 to 27 out of 27 Questions
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