1.
The ratio of hydrogen (H) and oxygen (O) in water molecule by volume is
2.
What is the fourth step of raw water treatment?
3.
The hardness that cannot be removed by boiling is called
4.
The density of water becomes maximum at
5.
Step of sewage water treatment in which sewage is placed in tanks and aerated with large blowers is called
6.
What percentage of fresh water is available to man?
7.
What is the second step of raw water treatment?
8.
What is the percentage of water from rivers and lakes?
9.
Permanent hardness of water is caused due to the presence of dissolved
10.
Step of sewage water treatment in which there are some aeration and organic material is converted to inorganic materials is called
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