Water Supply Engineering

201. Surface water is obtained from

1. Well
2. Springs
3. Artesian well
4. Rain

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202. Surface water may

1. Contain large amount of impurities
2. Be contaminated by impurities
3. Contain disease producing bacterias
4. All the above

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203. Surge tanks are used

1. For storage water
2. To increase the velocity in a pipeline
3. As overflow valves
4. To guard against water hammer

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204. The approximate diameter of a water mains for supplying 7.2 mld with a velocity 1.2 m/sec, is

1. 24 cm
2. 26 cm
3. 28 cm
4. 30 cm

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205. The average domestic consumption under normal conditions in an Indian city per day per person, is

1. 105 litres
2. 115 litres
3. 125 litres
4. 135 litres

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206. The bacterias which may survive with or without free oxygen, are called

1. Aerobic bacterias
2. Anaerobic bacterias
3. Facultative bacteria's
4. None of these

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207. The bacterias which require free oxygen for their survival, are called

1. Aerobic bacterias
2. Anaerobic bacterias
3. Facultative bacteria
4. None of these

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208. The bed slope in slow sand filters, is generally kept

1. 1 in 50
2. 1 in 75
3. 1 in 100
4. 0.200

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209. The best process of disinfection of public water supply, is by

1. Boiling
2. Chlorination
3. Adding lime
4. Adding ozone

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210. The best quality of filter material is obtained from quartzite if it does not loose weight when placed in hydrochloric acid for 24 hours, more than

1. 5 %
2. 8 %
3. 10 %
4. 12 %

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