WASTEWATER STORY

 

Wastewater Story

Worksheet 1  

Class 7 (CBSE)

Section A: Fill in the Blanks

1. Wastewater is also known as __________.
2. The process of removing impurities from wastewater is called __________.
3. The first step in wastewater treatment is __________, where larger objects are removed.
4. Sewage contains solid waste, organic matter, and __________.
5. The treated water from sewage treatment plants is often released into __________.

Section B: True or False

6. Wastewater is mainly generated from industries only. (True/False)
7. Filtration is a process used to remove large solid particles from wastewater. (True/False)
8. Grit and sand are removed in the primary treatment stage. (True/False)
9. Bacteria and other microbes help in breaking down organic matter in wastewater. (True/False)
10. Untreated sewage can cause diseases such as cholera and typhoid. (True/False)

Section C: Match the Following

Column A	Column B
11. Sludge	(a) Removes floating oil and grease
12. Screening	(b) Solid waste that settles at the bottom
13. Chlorination	(c) Kills harmful germs
14. Aeration	(d) Process to add air for microbial growth
15. Skimming	(e) Removes large debris from sewage

Section D: Short Answer Questions

16. What is sewage? Name two sources of sewage.
17. Why is wastewater treatment necessary?
18. List the three main stages of wastewater treatment.
19. What happens to the sludge removed from wastewater?
20. How can we reduce water pollution at home?

Section E: Long Answer Questions

21. Explain the process of wastewater treatment in a sewage treatment plant.
22. How does improper disposal of wastewater affect the environment and human health?
23. Suggest some ways to manage wastewater effectively in daily life.

Activity-Based Question

24. Draw a neat diagram of a sewage treatment plant and label its main parts.

Worksheet 2 

Section A: Fill in the Blanks

1. The impurities present in wastewater are called __________.
2. The system of pipes that carries wastewater from homes and industries is called __________.
3. __________ is a process in which harmful germs are killed by adding chlorine.
4. Wastewater contains organic and inorganic __________.
5. The bacteria used in sewage treatment break down __________ matter.

Section B: True or False

6. Sewage treatment is an unnecessary process. (True/False)
7. Chemical treatment is the only method used in wastewater treatment plants. (True/False)
8. Wastewater from industries may contain toxic chemicals and heavy metals. (True/False)
9. Clean drinking water can be obtained directly from sewage water. (True/False)
10. Untreated wastewater can lead to waterborne diseases. (True/False)

Section C: Choose the Correct Option

11. The process of adding air to help bacteria break down waste in wastewater treatment is called:
    a) Filtration
    b) Aeration
    c) Chlorination
    d) Screening

12. The solid waste that settles at the bottom during primary treatment is called:
    a) Sludge
    b) Foam
    c) Oil
    d) Gas

13. The main purpose of wastewater treatment is to:
    a) Make water salty
    b) Remove impurities
    c) Add more dirt
    d) Increase pollution

14. The bacteria used in wastewater treatment plants help in:
    a) Creating more waste
    b) Purifying air
    c) Breaking down organic waste
    d) Making water dirty

15. Which of the following is a major source of wastewater?
    a) Industries
    b) Households
    c) Agriculture
    d) All of the above

Section D: Short Answer Questions

16. What is wastewater? Name any two sources.
17. What is sludge, and how is it treated?
18. Why should we not throw cooking oil and fats into the drain?
19. What are the harmful effects of untreated sewage?
20. How does a septic tank work?

Section E: Long Answer Questions

21. Describe the different stages of wastewater treatment in detail.
22. How can we contribute to reducing water pollution in our daily lives?
23. What are the differences between primary, secondary, and tertiary sewage treatment?
24. Why is proper sanitation important for public health?

Activity-Based Question

25. Conduct a survey in your neighborhood and list some practices that lead to wastewater pollution. Suggest improvements.