Civil Engineering - Waste Water Engineering

16. 

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 stabilised refuse by the Bangalore method of compositing is a powdery mass called humus
D. all of these.

Answer: Option D

Explanation:

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17. 

The liquid wastes from kitchens, bath rooms and wash basins, is not called

A. liquid waste
B. sullage
C. sewage
D. none of these.

Answer: Option C

Explanation:

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18. 

The presence of free ammonia in sewage, is detected by

A. boiling
B. adding pottassium permanganate
C. adding sulphuric acid
D. phenol-di-sulphuric acid.

Answer: Option A

Explanation:

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19. 

The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known

A. Bio-Chemical Oxygen Demand (B.O.D.)
B. Dissolved Oxygen (D.O.)
C. Chemical Oxygen Demand (C.O.D.)
D. None of these.

Answer: Option B

Explanation:

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20. 

The standard B.O.D. of water is taken for

A. 1 day
B. 2 days
C. 3 days
D. 5 days
E. 10 days.

Answer: Option D

Explanation:

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