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- 1. Multiple Choice
What is a sewage treatment plant?
The place where water is cleaned, filtered and tested before re-entering the water cycle.
The place where water is cleaned, filtered and tested before going to our houses.
The network of pipes that carry sewage (dirty water) from our houses.
The place where water is bottled for drinking.
- 2. Multiple Choice
What type of living things eat the organic matter in the sewage?
Plants
Animals
Bacteria
Fungi
- 3. Multiple Choice
Sewage is mainly a
liquid waste.
solid waste.
gaseous waste.
mixture of solid and gas.
- 4. Multiple Choice
What happens to the sewage in the first step of treatment?
The organic matter is eaten by bacteria.
The sewage water is aerated.
It is screened to remove solid wastes
It is filtered and disinfected.
- 5. Multiple Choice
Which of the following is/are products of wastewater treatment?
Biogas
Sludge
Aerator
Both biogas and sludge
- 6. Multiple Choice
What is obtained after aeration step?
Primary sludge
Activated sludge
solid waste materials
- 7. Multiple Choice
In which part of the Waste water treatment does the the sludge and scum separated from the liquid?
Inlet works
Clarifiers
Sewage treatment plant
Bio reactor
- 8. Multiple Choice
Pick from the following one chemical used to disinfect water.
chlorine
coal
washing soda
silica
- 9. Multiple Choice
In the treatment of waste water, following steps are involved. (i) aeration (ii) removal of large objects (iii) chlorination The correct order of these steps is
(i),(iii),(ii)
(iii), (ii), (i)
(i), (ii), (iii)
(ii), (i), (iii)
- 10. Multiple Choice
The biogas product is used as a source of ___________.
Rains
Energy
Oils
All of these
- 11. Multiple Choice
What decomposes the sludge ______________.
Anaerobic Bacteria
Aerobic Bateria
Both of the above
None of these
- 12. Multiple Choice
Open drain system is a breeding place for which of the following ?
files
mosquitoes
organisms which cause diseases
all of theses
- 13. Multiple Choice
Which of the following is a good practice be followed?
Cooking oil and paint should not be thrown down a drain.
Used tea leaves, solid food and cotton should not be thrown in the drain.
Chemicals like insecticides should not throw in the drain.
All of the above
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