NCERT Solutions Class 7 Science Chapter 18 Wastewater Story – Here are all the NCERT solutions for Class 7 Science Chapter 18. This solution contains questions, answers, images, explanations of the complete chapter 18 titled Wastewater Story of Science taught in class 7. If you are a student of class 7 who is using NCERT Textbook to study Science, then you must come across chapter 18 Wastewater Story. After you have studied lesson, you must be looking for answers of its questions. Here you can get complete NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story in one place.
NCERT Solutions Class 7 Science Chapter 18 Wastewater Story
Here on AglaSem Schools, you can access to NCERT Book Solutions in free pdf for Science for Class 7 so that you can refer them as and when required. The NCERT Solutions to the questions after every unit of NCERT textbooks aimed at helping students solving difficult questions.
For a better understanding of this chapter, you should also see summary of Chapter 18 Wastewater Story , Science, Class 7.
| Class | 7 |
| Subject | Science |
| Book | Science |
| Chapter Number | 18 |
| Chapter Name |
Wastewater Story |
NCERT Solutions Class 7 Science chapter 18 Wastewater Story
Class 7, Science chapter 18, Wastewater Story solutions are given below in PDF format. You can view them online or download PDF file for future use.
Wastewater Story
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Question & Answer
Q.1: Fill in the blanks:
(a) Cleaning of water is a process of removing ____________.
(b) Wastewater released by houses is called ____________.
(c) Dried ____________ is used as manure.
(d) Drains get blocked by ____________ and ____________.
Ans : (a) Cleaning of water is a process of removing pollutants. (b) Wastewater released by houses is called sewage. (c) Dried sludge is used as manure. (d) Drains get blocked by Cooking oil and Fats.
Q.2: What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas.
Ans : Sewage is the wastewater containing both liquid and solid wastes produced by human activities from homes, industries, hospitals, offices, etc. Sewage contains various contaminants including disease-causing bacteria and other microbes. If untreated sewage is discharged into rivers or seas, then the water in the rivers or seas would also get contaminated. If this contaminated water is used for drinking, then it can cause diseases such as cholera, typhoid, dysentery, etc. which may lead to death. That is why it is harmful to discharge untreated sewage into rivers or seas.
Q.3: Why should oils and fats be not released in the drain? Explain.
Ans : Oils and fats harden and block the sewage pipes. In an open drain also, fats block porosity of soil which affects its water filtering efficiency. That is why oils and fats should not be released in the drain.
Q.4: Describe the steps involved in getting clarified water from wastewater.
Ans : The steps involved in getting clarified water from wastewater are as follows: (i)Use an aerator to bubble air through the wastewater. A mechanical stirrer or a mixer can also be used in place of the aerator. This helps in reducing bad odour of the wastewater. (ii)Then, the water is filtered through the layers of sand, fine gravel, and medium gravel. Filtration makes the wastewater clean from various types of pollutants. The water is filtered continuously until it becomes clear. (iii)Then any disinfectant such as chlorine tablet is added to the filtrate and stirred to obtain completely clear water.
Q.5: What is sludge? Explain how it is treated.
Ans : Semi-solids such as faeces that settle down during wastewater treatment are called sludge. This sludge is removed using a scraper and then transferred to a tank where it is decomposed by anaerobic bacteria to produce biogas. This biogas is used as a low-cost fuel for heating, cooking, etc. It is also used to produce electricity.
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