Waste Water Engineering Online MCQ Test - Set 11 - ObjectiveBooks

# Practice Test: Question Set - 11

1. The pH value of fresh sewage is usually
(A) Equal to 7
(B) More than 7
(C) Less than 7
(D) Equal to zero

2. The maximum depth of sedimentation tanks, is kept
(A) 3 m
(B) 3.5 m
(C) 4 m
(D) 4.5 m

3. If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is
(A) 50 ppm
(B) 100 ppm
(C) 150 ppm
(D) 200 ppm

4. Pick up the correct statement from the following:
(A) Indore method of composting involves decomposition under aerobic conditions
(B) Bangalore method of composting involves decomposing under anaerobic conditions
(C) Fully stabilized refuse by the Bangalore method of compositing is a powdery mass called humus
(D) All of these

5. Lead caulked joints are used for laying
(A) Stone ware pipes
(B) Earthenware pipes
(C) C.I. pipes
(D) G.I. pipes

6. If D is the diameter of a circular sewer and D' is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is
(A) D' = 0.64 D
(B) D' = 0.74 D
(C) D' = 0.84 D
(D) D' = 0.94 D

7. The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be
(A) 0.9 cm
(B) 1.2 m
(C) 1.5 m
(D) > 1.5 m

8. A sewer running partially full and hurried with back filled, fails in compression due to
(A) Weight of the pipe
(B) Weight of the back fill
(D) All the above

9. A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is
(A) 100
(B) 1000
(C) 5000
(D) 10000

10. Kjeldahl nitrogen is a mixture of
(A) Ammonia and nitrogen
(B) Nitrogen and organic nitrogen
(C) Organic nitrogen and ammonia
(D) All the above

11. The quantity of liquid waste which flows in sewers during the period of rainfall, is known
(A) Sanitary sewage
(B) Industrial waste
(C) Storm sewage
(D) None of these

12. Nitrogen cycle of sewage, is
(A) Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen
(B) Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates
(C) Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia
(D) Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates

13. Depletion of ozone layer in the outer atmosphere may cause
(A) Lung cancer
(B) Skin cancer
(C) Bronchitis
(D) Heart disorder

14. The minimum diameter of a sewer is kept
(A) 10 cm
(B) 15 cm
(C) 20 cm
(D) 25 cm

15. A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is
(A) 2.30 m
(B) 2.40 m
(C) 2.45 m
(D) 2.50 m

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