1.The open wells or dug wells ?
- act as a small storage reservoir
- are suitable for a small discharge all of
- are cheap in construction
- all of these
2.High turbidity of water can be determined by ?
- turbidity tube
- Jacksons turbidimeter
- Baylis turbidimeter
- Hellipe turbidimeter
3.Colloidal impurities if associated with organic matter having bacterias becomes the chief source of ?
- hardness
- epidemic
- alkalinity
- bad taste
4.The maximum permissible temperature for domestic supply is ?
- 5 to 10°C
- 10 to 15°C
- 15 to 20°C
- 20 to 25°C
5.When lead is present in water, it ?
- changes its colour
- causes turbidity
- causes alkalinity
- none of these
6.The water obtained from is generally known as underground water ?
- infiltration galleries
- springs
- rivers
- wells
7.According to Indian standards, 45 litres of water per person per day is provided in case of ?
- hotels
- hostels
- offices
- all of these
8.The most common cause of acidity in water is ?
- hydrogen
- oxygen
- carbon dioxide
- all of these
9.Dissolved impurities consist of ?
- bacteria
- iron
- slit
- fungi
10.For large cities, the suitable method for forecasting population is ?
- arithmetical increase method
- graphical method
- geometrical increase
- comparative method.
11.The odour of water can be determined by ?
- thermometer
- Osmoscope
- Jackson's turbidimeter
- none of these.
12.The finely divided dispersion of solid particles which are not visible to the naked eye and cannot be removed by ordinary filters are known as ?
- suspended impurities
- dissolved impurities
- colloidal impurities
- none of these
13.According to Indian standards, the consumption of water per capita per day for nursing homes, boarding schools and hostels is ?
- 85 litres
- 100 litres
- 115 litres
- 135 litres
14.The maximum permissible chloride content in water for domestic supplies should not exceed ?
- 250 ppm
- 350 ppm
- 450 ppm
- 550 ppm
15.The maximum permissible colour for domestic supplies, on platinum cobalt scale is ?
- 5 to 10 ppm
- 10 to 20 ppm
- 20 to 30 ppm
- 30 to 40 ppm
16.The maximum acidity in water will occur at a pH value of ?
- 0
- 2
- 7
- 14
17.When the pO value of water is 5, then it has ?
- no perceptible odour
- distinct odour
- faint odour
- extremely strong odour
18.The turbidity in water is caused due to ?
- silt
- clay
- finely divided organic matter
- all of these
19.The continuous flow of water may be expected from ?
- surface springs
- artesian springs
- gravity springs
- all of these.
20.The amount of water collected in a reservoir is divided into three portions and the order of their existance from bottom to the top is ?
- useful storage, surcharge storage, dead storage
- useful storage, dead storage, surcharge storage
- dead storage, useful storage, surcharge storage
- none of the above.
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