Waste Water Engineering MCQ Questions & Answers

If n is the rugosity coefficient, r is the hydraulic depth, s is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula $${\text{V}} = \frac{1}{{\text{n}}}{{\text{r}}^{\frac{2}{3}}}{{\text{s}}^{\frac{1}{2}}}$$ evolved by

A) Chezy B) Manning C) Bazin D) Kutter

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Answer: Option B

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In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is

A) $$\frac{{\text{Q}}}{{{\text{B}} \times {\text{D}}}}$$ B) $$\frac{{\text{Q}}}{{{\text{L}} \times {\text{D}}}}$$ C) $$\frac{{\text{Q}}}{{\text{L}}}$$ D) $$\frac{{\text{Q}}}{{{\text{B}} \times {\text{L}}}}$$

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Answer: Option D

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Maximum permissible velocity 1.5 m/sec, is adopted in drains

A) With beds of rocks and gravels B) Lined with stones C) Both A. and B. D) Neither A. nor B.

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Answer: Option C

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Aerobic bacterias

A) Flourish in the presence of free oxygen B) Consume organic matter as their food C) Oxidise organic matter in sewage D) All the above

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Answer: Option D

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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

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Answer: Option C

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To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is

A) 0.50 m/sec B) 0.60 m/sec C) 0.70 m/sec D) 0.75 m/sec

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Answer: Option D

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Which one of the following gases is most significant as air pollutant?

A) Carbondioxide B) Oxygen C) Nitrogen D) Sulphur-dioxide

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Answer: Option D

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

A) 1 day B) 2 days C) 3 days D) 5 days

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Answer: Option D

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Dried sewage after treatment is used as

A) Fertilizer B) Building material C) Chemical for lowering B.O.D. D) Base material for paints

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Answer: Option A

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The sewer which transports the sewage to the point of treatment, is called

A) House sewer B) Out-fall sewer C) Branch sewer D) Main sewer

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Answer: Option B

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Waste Water Engineering MCQ Questions & Answers | Civil Engineering