Waste Water Engineering(Civil Engineering ) Questions and Answers
Question 1. The effluent of a septic tank is
Fit for discharge into any open drain
Foul and contains dissolved and suspended solids
As good as that from a complete treatment
None of these
Explanation:-
Answer: Option A. -> Fit for discharge into any open drain
Question 2. The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope
1 in 5
1 in 10
1 in 15
1 in 20
Explanation:-
Answer: Option B. -> 1 in 10
Question 3. Drop manholes are the manholes
Without entry ladders
Without manhole covers
With depths more than 3.5 m
Having drains at different levels
Explanation:-
Answer: Option D. -> Having drains at different levels
Question 4. For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of
100 cm
120 cm
140 cm
160 cm
Explanation:-
Answer: Option D. -> 160 cm
Question 5. 5 days-biochemical oxygen demand (BOD5) is taken at a temperature of
0°C
15°C
20°C
25°C
Explanation:-
Answer: Option C. -> 20°C
Question 6. The suitable cross-section of sewers to carry combined flow, is
Circular
Egg shaped
Rectangular
Horse shoe shaped
Explanation:-
Answer: Option B. -> Egg shaped
Question 7. Facultative bacteria survive in
The presence of oxygen
The absence of oxygen
Both cases A and B
Neither A nor B
Explanation:-
Answer: Option C. -> Both cases A and B
Question 8. The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is
5 m
5.5 m
6.5 m
7 m
Explanation:-
Answer: Option D. -> 7 m
Question 9. A nuisance is experienced in diluting water if dilution factor is less than
100
60
40
20
Explanation:-
Answer: Option D. -> 20
Question 10. Discrete or granular particles change their
