AR 8422 - BUILDING SERVICES I

Surface water is constantly replenished through ____________, and lost through ___________.

• precipitation & evaporation

• evaporation & precipitation

• evaporation & dissipation

• precipitation & dissipation

According to the environmental protection Agency ( EPA ) , _________% of community water system users received their water from a surface water source, such as a lake.

• 60 %

• 68 %

• 70 %

• 74 %

In urban India, _________ % of the water supply is groundwater-based

• 40%

• 70%

• 60%

• 50%

Nearly ____ per cent of the water required for irrigation is met from groundwater resources .

• 87

• 90

• 75

• 80

Oxygen is provided to break the carbon in microorganisms to carbon dioxide and water to ___________ hence making it easy to be filtered.

• Soluble masses

• Insoluble masses

• Compound masses

• none of the above

The process of using chemicals to make suspended particles form a clump which can then be filtered is called

?

• Aeration

• condensation

• Coagulation

• Filtration

Choose the types of pipes used in water treatment:

• Cast Iron Pipes

• Steel Pipes

• Galvanized Iron pipes ( GI )

• All of the above

Choose the common storm water pollutants.

• Pesticides

• Litter

• Motor oil

• All of the above

A drainage pipe used to convey a stream through a road or embankment or may carry a stream for a long distance underground to a surface discharge location is called?

• Culvert

• Rainwater pipes

• Recharge pipes

• Channel pipes

“the movement of water though the soil and its layers, by gravity and capillary forces.” is called?

• Coagulation

• Aeration

• Percolation

• sedimentation