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Wastewater story Class 7 Worksheet Science Chapter 13
Q.1. Fill in the blanks.
(i) Cleaning of water is a process of removing _______ .
(ii) Wastewater released by houses is called ______.
(iii) Dried ____ is used as manure.
(iv) Drains get blocked by ____ and ____.
(v) By-products of wastewater treatment are ____ and ____ .
Q.2. State True (T) or False (F).
(i) Clean water is a basic need of human being.
(ii) Used water is clean water.
(iii) Treatment plants reduce pollutants in wastewater to a level where nature can take care of it.
(iv) Open drain system is a breeding place for flies, mosquitoes and organisms which cause diseases.
(v) People should defecate in the open.
Q.3. Name two chemicals used to disinfect water.
Q.4. What is sewerage?
Q.5. Which day is celebrated as World Water Day?
Q.6. Why chemicals should not be thrown down the drain?
Q.7. What is waste water?
Q.8. What causes blockage of the drain?
Q.9. What are the reasons for scarcity of freshwater?
Q.10. What are the harmful effects of drinking contaminated water?
Q.11. Why air is pumped into clarified water?
Q.12. Why should eucalyptus trees be planted along sewage ponds?
Q.13. Why are bacteria important in sewage treatment?
Q.14. Why should oils and fats be not released in the drain? Explain.
Q.15. Write two uses of ozone
Q.16. What is cleaning of water?
Q.17. What is sewage treatment?
Q.18. Outline your role as an active citizen in relation to sanitation.
Q.19. How can we contribute in maintaining sanitation at public places?
Q.20. Explain the function of bar screens in a wastewater treatment plant.
You can find Worksheets Solutions here: Worksheet Solutions: Wastewater story
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FAQs on Wastewater story Class 7 Worksheet Science Chapter 13
| 1. What is wastewater? |  |
Ans. Wastewater refers to any water that has been used and contaminated by human activities, such as domestic, industrial, or commercial processes. It may contain various pollutants and needs to be treated before it can be safely discharged back into the environment.
| 2. Why is wastewater treatment important? | |
Ans. Wastewater treatment is crucial for several reasons. Firstly, it helps to protect public health by removing harmful pathogens and bacteria from the water before it is released back into rivers or oceans. Secondly, it helps to protect the environment by removing pollutants and chemicals that can harm aquatic life. Lastly, it allows for the reuse of treated wastewater, reducing the strain on freshwater resources.
| 3. What are the different stages of wastewater treatment? | |
Ans. Wastewater treatment typically involves several stages. The primary treatment stage involves the removal of large solid particles through processes like screening and sedimentation. The secondary treatment stage focuses on removing dissolved organic matter using biological processes, such as activated sludge or trickling filters. Lastly, the tertiary treatment stage involves advanced processes like filtration and disinfection to further remove remaining contaminants.
| 4. Can wastewater be reused? | |
Ans. Yes, wastewater can be treated and reused for various purposes. This treated wastewater, also known as reclaimed water, can be used for irrigation, industrial processes, or even for replenishing groundwater reserves. However, it is essential to ensure that the treated wastewater meets specific quality standards to avoid any potential health or environmental risks.
| 5. How does wastewater treatment contribute to sustainable development? | |
Ans. Wastewater treatment plays a significant role in sustainable development. By treating wastewater, we can protect public health, preserve freshwater resources, and prevent water pollution. Moreover, treated wastewater can be utilized for various beneficial purposes, reducing the demand for freshwater sources and promoting the efficient use of water. Overall, wastewater treatment helps in creating a more sustainable and environmentally friendly future.
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Dec 17, 2024 Last updated |
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