18. Wastewater Story Class 7 Science [LATEST] Solutions topic -3 in English - CBSE Study
NCERT Solutions for Class 7 Science are carefully prepared according to the latest CBSE syllabus and NCERT textbooks to help students understand every concept clearly. These solutions cover all important 18. Wastewater Story with detailed explanations and step-by-step answers for better exam preparation. Each topic -3 is explained in simple language so that students can easily grasp the fundamentals and improve their academic performance. The study material is designed to support daily homework, revision practice, and final exam preparation for Class 7 students. With accurate answers, concept clarity, and structured content, these NCERT solutions help learners build confidence and score higher marks in their examinations. Whether you are revising a specific topic or preparing an entire chapter, this resource provides reliable and syllabus-based guidance for complete success in Science.
Class 7 English Medium Science All Chapters:
18. Wastewater Story
3. topic -3
Additional Question with solution:
Que: Wastewater is fit for human consumption or not. give reason to support your.
Ans: No, because it is dirty and has many diseases causing organisms like cholera, typhoid, etc.
Que: Name two chemicals used to disinfect wastewater.
Ans: Chlorine and ozone.
Que: Special type to toilets has been designed in aeroplanes, name it.
Ans: Vacuum toilets.
Que: Name the toilets used in areas with limited water supply.
Ans: Vermi - processing toilets.
Que: Name the type of toilets which are most suitable for holding an outdoor music festival in a park.
Ans: Chemical toilets.
Que: Name two things that can be made from sludge extracted during treatment of sewage.
Ans: Biogas and manure.
Que: Name two inorganic impurities present in sewage.
Ans: Inorganic impurities present in sewage are nitrates and phosphates.
Que: Mention the use of dried sludge.
Ans: It is used manure, thus returning organic matter and nutrients to the soil.
Que: Mention the use of dried sludge.
Ans: It is used as manure, thus returning organic matter and nutrients to the soil.
Que: In which type of toilets, human excreta is treated by earthworm?
Ans: Vermi - processing toilets.
Que: Give some examples of onsite sewage disposal systems.
Ans: Chemical toilets, septic tanks, composting pits, etc.
Topic Lists: