Waste Water Engineering MCQ Questions & Answers

21

The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is

A) 213.5 cm/sec B) 313.5 cm/sec C) 413.5 cm/sec D) 500 cm/sec

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Answer & Solution

Answer: Option B

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22

For evaporation and measurement of settable solids, the apparatus used, is

A) A jar B) A breaker C) A test tube D) An Imhoff cone

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Answer & Solution

Answer: Option D

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23

As compared to fresh river water, sea water contains oxygen

A) 10% less B) 20% less C) 10% more D) 20% more

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Answer & Solution

Answer: Option B

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24

You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at

A) Full depth B) Half full C) Two third full D) Three fourth full

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Answer & Solution

Answer: Option C

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25

The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is

A) $${{\text{V}}_{\text{s}}} = 418\left( {{{\text{G}}_{\text{s}}} - {{\text{G}}_{\text{w}}}} \right){\text{d}}\left( {\frac{{3{\text{T}} + 70}}{{100}}} \right)$$ B) $${{\text{V}}_{\text{s}}} = 418\left( {{{\text{G}}_{\text{s}}} - {{\text{G}}_{\text{w}}}} \right){{\text{d}}^2}\left( {\frac{{3{\text{T}} + 70}}{{100}}} \right)$$ C) $${{\text{V}}_{\text{s}}} = 218\left( {{{\text{G}}_{\text{s}}} - {{\text{G}}_{\text{w}}}} \right){{\text{d}}^2}\left( {\frac{{3{\text{T}} + 70}}{{100}}} \right)$$ D) $${{\text{V}}_{\text{s}}} = 218\left( {{{\text{G}}_{\text{s}}} - {{\text{G}}_{\text{w}}}} \right){\text{d}}\left( {\frac{{3{\text{T}} + 70}}{{100}}} \right)$$

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Answer & Solution

Answer: Option B

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26

Sewer manholes are generally provided at

A) The change of gradient B) The change of direction C) The junctions of sewers D) All of these

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Answer & Solution

Answer: Option D

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27

Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to

A) Initial demand B) First stage demand C) Carbonaceous demand D) All of these

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Answer & Solution

Answer: Option D

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28

The asbestos cement pipes are generally laid

A) Horizontally B) Vertically C) At an angle of 30° D) At an angle of 60°

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Answer & Solution

Answer: Option B

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29

pH value of sludge during alkaline regression stage, is

A) More than 7 B) Less than 7 C) Less than 6 D) More than 6

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Answer & Solution

Answer: Option A

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30

The small sewers are cleaned by

A) Flushing B) Cane rodding C) Wooden pills D) None of these

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Answer & Solution

Answer: Option A

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Waste Water Engineering MCQ Questions & Answers | Civil Engineering