1. Choose the correct answer from the following:

The unit of turbidity is

MTU

KTU

NTU

LTU

Which source of water, among the following, is not a surface source?

River

Well

Lake

Ocean

Water storage improves water quality.

True

False

Slow sand filters are not suitable for places where cost of land is high.

True

False

Fish in the water will be killed, if D.O. is

4 ppm

4 ppm

2 ppm

2 ppm

The gas which is generally present in sewer is

H2S

CO2

CH4

O2

Grit Chamber removes

Organic matter

Inorganic matter

Both and

None of these

Enlist the underground water sources and explain any two.

Write the important considerations for selection of sources of water for a city.

Explain domestic water demand. Give a distribution chart for domestic water demand.

Give a flow diagram of water treatment plant.

4. Draw a neat sketch of a slow sand filter and describe how it works.

Write a note on waste water reuse.

Explain the following:

Self cleansing velocity

Limiting velocity

What do you understand by trickling filters? Discuss its working with a flow diagram.

What is sludge thickening? Explain any one method.

7. Write short notes on any four of the following:

Turbidity

Hardness of water

Centrifugal pumps

Grab and composite sampling

Corrosion in pipes

Grid-Iron system