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Biology 12 Ch-27 BIOLOGY AND HUMAN WELFARE- 53
1.
Which stages are involved in sewage treatment?
Tertiary treatment
Primary treatment
Secondary treatment
All of these
2.
Which of the following stage of sewage treatment holds the sewage in a quiescent basin?
Primary treatment
Tertiary treatment
All of these
Secondary treatment
3.
In which of the following stage, heavy solids settle down to the bottom?
None of these
Primary treatment
Tertiary treatment
Secondary treatment
4.
In which of the following stage, oil, grease and lighter solids float to the surface?
Tertiary treatment
Primary treatment
None of these
Secondary treatment
5.
Which of the following float to the surface in primary treatment?
Grease
Lighter solids
All of these
Oil
6.
Which of the following settle down to the bottom in primary treatment?
Heavy solids
Lighter solids
Oil
Grease
7.
What is done to the floating materials in primary treatment?
Are mixed
Are subjected to secondary treatment
Are removed
Are absorbed
8.
What is done to the settled materials in primary treatment?
Are subjected to secondary treatment
Are mixed
Are absorbed
Are removed
9.
What is done to the remaining liquid in primary treatment?
Are absorbed
Are subjected to secondary treatment
Are mixed
Are evaporated
10.
What is done to the remaining liquid in primary treatment?
May be discharged
Are mixed
Are evaporated
Are absorbed
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