What is night soil?

• Soil containing urea

• Human excreta

• Animal excreta

• Human excreta, animal excreta and urea

Wastewater from different sources like bathrooms, kitchens and wash basins is called

• Sewage

• Garbage

• Sullage

• Discharge

Which of the following common unit is used to express the rate of water supply to a city or town?

• Litres/capita/second

• Litres/capita/day

• Millilitres/capita/day

• Millilitres/capita/hour

The quantity of water supply is equal to the rate of supply multiplied by the

• Population

• Quantity of sewage

• Area

• Net usage

Wet weather flow is _________ than the dry weather flow.

• Lower

• Higher

• Equal to

• Not equal to

When only one set of sewers are used to carry both sanitary sewage and storm water, it is called as __________ system.

• Partial

• Direct

• Combined

• Separate

A masonry or R.C.C. chamber constructed at suitable intervals along the sewer lines, for providing access into them is called

• Inverted siphons

• Manhole

• Flushing tanks

• Clean-outs

Turbidity in water is caused by which of these following?

• Total dissolved solids

• Ions

• Heavy metals

• Suspended solids

Which characteristic of water does Calcium contribute to?

• Hardness

• Suspended solids

• pH

• Colour

How are many forms of nitrogen present in wastewater?

• 3

• 4

• 2

• 5