1. Choose the correct answer from the following:
The unit of turbidity is MTU

(ii) KTU

(iii) NTU

(iv) LTU Which source of water, among the following, is not a surface source? River

(ii) Well

(iii) Lake
Ocean Water storage improves water quality. True

(ii) False Slow sand filters are not suitable for places where cost of land is high. True

(ii) False Fish in the water will be killed, if D.O. is 4 ppm

(ii) 4 ppm

(iii) 2 ppm

(iv) 2 ppm The gas which is generally present in sewer is H2S

(ii) CO2

(iii) CH4

(iv) O2 Grit Chamber removes Organic matter

(ii) Inorganic matter

(iii) Both and

(iv) None of these

2.(a) Enlist the underground water sources and explain any two.
Write the important considerations for selection of sources of water for a city.

3.(a) 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.

5.(a) Write a note on waste water reuse.
Explain the following:
Self cleansing velocity

(ii) Limiting velocity

6.(a) 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