SEBA Class 7 Science Important Chapter 18 Waste water Story

SEBA Class 7 Science Important Chapter 18 Waste water Story Solutions English Medium As Per New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters SEBA Class 7 General Science Additional Solutions and select need one. SCERT Important Solutions For Class 7 General Science Download PDF. Important Notes for Class 7 Science SCERT.

SEBA Class 7 Science Important Chapter 18 Waste water Story

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. Assam SEBA Board Class 7 Science Additional Question Answer are part of All Subject Solutions. Here we have given SCERT Class 7 General Science Important Notes for All Chapters, You can practice these here.

Waste water Story

Chapter: 18

IMPORTANT QUESTION ANSWER

A. Very Short Type Questions & Answers:

1. What is sewage?

Ans: Sewage is wastewater released from homes, industries, hospitals, offices, and rainwater runoff. It contains harmful impurities like organic waste, chemicals, and disease-causing microbes.

2. What are contaminants?

Ans: Contaminants are unwanted substances in sewage, including human waste, food particles, oils, chemicals, and microbes.

3. What is the function of bar screens in a wastewater treatment plant?

Ans: Bar screens remove large solid objects like rags, plastics, and napkins from the sewage.

4. What is sludge?

Ans: Sludge is the solid waste that settles at the bottom of the clarifier tank in a wastewater treatment plant.

5. What is the use of biogas?

Ans: Biogas produced from decomposed sludge can be used as fuel or to generate electricity.

6. What is vermi-processing toilet?

Ans: A vermi-processing toilet uses earthworms to convert human excreta into compost. It is hygienic and uses very little water.

7. Why should we not throw fats and oils into drains?

Ans: Fats and oils can harden and block the pipes, causing drainage problems.

8. What are manholes?

Ans: Manholes are openings constructed at intervals in a sewerage system to allow inspection and cleaning of the drains.

B. Fill in the Blanks:

1. The process of cleaning wastewater is called ________.

Ans: Sewage treatment.

2. The water that enters drains after use is called _____.

Ans: Wastewater.

3. The network of pipes that carries sewage is called a ________.

Ans: Sewerage system.

4. Microorganisms such as bacteria break down _______ in sewage.

Ans: Organic matter.

5. Treated sludge is dried and used as _______.

Ans: Manure.

C. True or False:

1. All water used in homes becomes sewage. 

Ans: True.

2. Cooking oil should be poured down the drain. 

Ans: False.

3. The bar screen removes dissolved impurities from sewage. 

Ans: False.

4. Untreated sewage is a health hazard. 

Ans: True.

5. Clarifier tank is used to separate grit and sand. 

Ans: False.