Water Supply Engineering MCQ Questions & Answers | Civil Engineering Page-3 section-1

21.
Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be

A. nil

B. 5

C. 10

D. 15

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22.
For determining the velocity of flow of underground water, the most commonly used non-empirical formula is

A. Darcy’s formula

B. Slichter’s formula

C. Hazen’s formula

D. Lacy’s formula

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23.
Aeration of water is done to remove

A. odour

B. colour

C. bacterias

D. hardness

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24.
Disinfection of drinking water, is done to remove

A. odour

B. bacterias

C. turbidity

D. colour

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25.
Specific capacity or yield of wells, is generally expressed, as

A. m³/sec

B. m³/hour

C. m³/hour/m²

D. m³/hour/m²/m

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26.
The least thickness of class B cast iron (spun) pipe, is

A. 7.2 mm

B. 7.9 mm

C. 8.6 mm

D. 10 mm

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27.
The maximum depth of sedimentation tanks is limited to

A. 3 m

B. 4 m

C. 5 m

D. 6 m

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28.
Corrosion of well pipes may not be reduced by

A. reducing the draw down and the pumping rate

B. reducing the flow velocity

C. using thicker pipes

D. using screens having larger area of openings

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29.
Pick up the incorrect statement from the following. The underground sources of water, is from

A. wells

B. springs

C. infiltration wells

D. storage reservoirs

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30.
Pick up the correct statement from the following:

A. The water level in a still well, represents the ground water table level

B. The difference between water table level and the water level in a well after pumping, is called depression head

C. The surface of water table surrounding a well during pumping, forms a cone of depression

D. All the above

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Water Supply Engineering MCQ Questions & Answers | Civil Engineering

21. Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be

Answer & Solution

22. For determining the velocity of flow of underground water, the most commonly used non-empirical formula is

Answer & Solution

23. Aeration of water is done to remove

Answer & Solution

24. Disinfection of drinking water, is done to remove

Answer & Solution

25. Specific capacity or yield of wells, is generally expressed, as

Answer & Solution

26. The least thickness of class B cast iron (spun) pipe, is

Answer & Solution

27. The maximum depth of sedimentation tanks is limited to

Answer & Solution

28. Corrosion of well pipes may not be reduced by

Answer & Solution

29. Pick up the incorrect statement from the following. The underground sources of water, is from

Answer & Solution

30. Pick up the correct statement from the following:

Answer & Solution

21.
Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be

22.
For determining the velocity of flow of underground water, the most commonly used non-empirical formula is

23.
Aeration of water is done to remove

24.
Disinfection of drinking water, is done to remove

25.
Specific capacity or yield of wells, is generally expressed, as

26.
The least thickness of class B cast iron (spun) pipe, is

27.
The maximum depth of sedimentation tanks is limited to

28.
Corrosion of well pipes may not be reduced by

29.
Pick up the incorrect statement from the following. The underground sources of water, is from

30.
Pick up the correct statement from the following: