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Class 7 Science Chapter 13 Wastewater Story Quiz 4 (25 MCQs)

Quiz Instructions

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1. Dried ..... is used as manure
2. The process of removing pollutants in water before it enter a water body is called
3. EXCRETA FROM TOILET SEATS FLOW THROUGH COVERED DRAINS INTO A .....
4. Floating impurities (such as grease and oils) in the sedimentation tank are removed by
5. The system of a network of pipes used for taking away wastewater from homes or public buildings to the treatment plant is known as
6. Which of the following is wastewater?
7. ACTIVATED SLUDGE IS MADE IS ABOUT ..... OF WATER
8. Dried sludge is used as .....
9. Which of these particles is NOT able to pass through a sand, gravel, and charcoal filter?
10. Suspended impurities contained by sewage are called
11. The process of removing pollutants in water before it enters a water body or reused.
12. How many minutes did Bacteria and E.coli reproduces?
13. Solid waste extracted in sewage treatment
14. What gas must be maintained at precise levels in the aeration tank?
15. Sludge in separate tanks is decomposed to get biogas by
16. In a filtration, plant water is filtered using layers of
17. The anaerobic bacteria releases ozone gas
18. NAME A LIQUID WASTE
19. Water that is not fit for use is called
20. The cutting of the desired plant is called?
21. The inorganic impurities in wastewater
22. The organic impurities present in sewage are
23. Which one is the characteristic of wastewater?
24. A word related to hygiene
25. Which of the following is a part of inorganic impurities of the sewage?
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