science - wastewater story

Class 7 - Science

Wastewater Story

Q&A
Question:

Why should oils and fats be not released in the drain? Explain.

Answer:

Oils and fats should not be released in drains because they harden the soil in the pipes and block them. Fats get clogged in holes of the soil in the drain and block it. It does not allow the water to flow.

 



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Questions and Answers


Wastewater Story - Questions
1.

Why should oils and fats be not released in the drain? Explain.


Answer
2.

What is sludge? Explain how it is treated.


Answer
3.

Name two chemicals used to disinfect water.


Answer
4.

Fill in the blanks:
(a) Cleaning of water is process of removing __________
(b) Wastewater released by houses is called __________.
(c) Dried __________ is used as manure.
(d) Drains get blocked by __________ and __________.


Answer
5.

What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas.


Answer
6.

Describe the steps involved in getting clarified water from wastewater.


Answer
7.

Explain the relationship between sanitation and disease.


Answer
8.

Here is a crossword puzzle. Good luck!
ncert-solutions-class-7-science-chapter-18-wastewater-story-01
Across:
3. Liquid waste products
4. Solid waste extracted in sewage treatment
6. A word related to hygiene
8. Waste matter discharged from human body
Down:
1. Used water
2. A pipe carrying sewage
5. Micro-organisms which cause cholera
7. A chemical to disinfect water


Answer
9.

Why should oils and fats be not released in the drain? Explain.


Answer
10.

Explain the Junction of bar screens in a wastewater treatment plant.


Answer
11.

Outline your role as an active citizen in relation to sanitation.


Answer
12.

Untreated human excreta is a health hazard. Explain.


Answer
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