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Water Supply Engineering MCQ

1. Pick up the incorrect statement from the following regarding fire hydrants

None of these.

The minimum water pressure hydrants, is kept 1.5 kg/cm2

Fire hydrants are fitted in water mains at 100 m to 150 m apart at fire

The water at pressure 1 to 1.5 kg/cm2 is made available for 4 to 5 hours for constant use

Answer

Correct Answer: None of these.

Note: This Question is unanswered, help us to find answer for this one

2. The specific retention is least in case of

Coarse gravel.

Clay

Sand

Silt

Answer

Correct Answer: Coarse gravel.

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3. In slow sland filters, the turbidity of raw water can be removed only up to

100 gm/litre

150 mg/litre.

60 mg/litre

75 mg/litre

Answer

Correct Answer: 60 mg/litre

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4. The maximum depth of sedimentation tanks is limited to

4 m

3 m

2 m

5 m

6 m.

Answer

Correct Answer: 6 m.

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5. Water supply system includes

Entire arrangement from source to distribution.

Digging a well for water

Construction of canals

Construction of dams

Answer

Correct Answer: Entire arrangement from source to distribution.

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6. Aeration of water is done to remove

Odour

Colour

Turbidity.

Bacterias

Hardness

Answer

Correct Answer: Odour

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7. Pick up the correct statement from the following:

Excess quantities of iron and manganese in water, cause discolouration of clothes

Higher copper content affects the lungs

All these

Lead and barium salts have toxic effect

Arsenic and selenium are poisonous to human health

Answer

Correct Answer: Excess quantities of iron and manganese in water, cause discolouration of clothes

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8. By boiling water, hardness can be removed if it is due to

Calcium sulphate

Calcium nitrate

Magnesium sulphate

Calcium bicarbonate

None of these.

Answer

Correct Answer: Calcium bicarbonate

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9. The transitional middle portion of a logistic curve follows

A constant rate.

A first over curve

A logarithmic growth

A geometric growth

Answer

Correct Answer: A constant rate.

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10. Economic height of a dam is the height corresponding to which

Cost of the dam per unit of storage is minimum

None of these.

Amount of silting is less

Cost of dam per unit storage is maximum

Free board provided is least

Answer

Correct Answer: Cost of the dam per unit of storage is minimum

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

8.6 mm

7.2 mm

10 mm.

7.9 mm

Answer

Correct Answer: 8.6 mm

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

Nil

Answer

Correct Answer: Nil

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13. Turbidity of raw water is a measure of

Suspended solids

B.O.D.

Acidity of water

None of these.

Answer

Correct Answer: Suspended solids

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14. Manholes along the mains from the source to a city are provided at 500 m intervals in

Steel pipes

Hume steel pipes

All these

R.C.C. pipes

Answer

Correct Answer: Steel pipes

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15. If four fires break out in a city of population 40 lakhs and if each hydrant has three streams and duration of each fire is four hours, the total quantity of water required, is

4880 kilo litres.

1880 kilo litres

2880 kilo litres

3880 kilo litres

Answer

Correct Answer: 2880 kilo litres

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16. Corrosion of well pipes may not be reduced by

Using screens having larger area of openings

Reducing the draw down and the pumping rate

Using thicker pipes

Reducing the flow velocity

None of these.

Answer

Correct Answer: Using screens having larger area of openings

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17. Water supply includes

Collection, transportation and treatment of water

Provision of hydrants for fire fighting

Mains, sub-mains and branch lines of water supply

All these

Distribution of water to consumers

Answer

Correct Answer: Collection, transportation and treatment of water

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18. Average annual rainfall at any station is the average of annual rainfall over a period of

21 years

14 years

35 years.

28 years

7 years

Answer

Correct Answer: 35 years.

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19. Time of concentration

Time taken for all the ran off to reach the drain

Duration of rainfall.

Time taken for the storm water to travel from the most remote point to the drain.

Is the time taken, for precipitation

Answer

Correct Answer: Time taken for the storm water to travel from the most remote point to the drain.

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20. Acidity in water is caused due to

Aluminium sulphate

All these

Mineral acids

Iron sulphate

Free CO2

Answer

Correct Answer: Mineral acids

Note: This Question is unanswered, help us to find answer for this one

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