CBSE Science Class 7

Waste Water Story

Waste Water Story - Chapter Wise CBSE Solved Question and Answer Based On NCERT

Short Q&A:

Q1: What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas?
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Q2: Oils and fats should not release in the drain. Explain why?
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Q3: What do you mean by waste water?
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Q4: Enlist the various causes of water pollution.
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Q5: What is sludge and how is it treated?
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Q6: What is sewage and sewage treatment?
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Q7: Explain why is it harmful to discharge untreated sewage into Water bodies?
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Q8: Untreated human excreta are a health hazard. Justify the statement.
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Q9: What do you understand by the term “sewerage”?
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Q10: List few ways to control sewage generation.
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Q11: What are the harmful effects of sewerage?
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Q12: Suggest some alternative arrangement for sewage disposal.
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Q13: Why bacteria are used in sewage treatment plants?
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Q14: Explain the various steps involved in water treatment plant.
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Q15: What is a manhole? Why are manholes made?
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Q16: Why chemicals should not be released in the drain?
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Q17: Explain why it is harmful to discharge untreated sewage into rivers or seas.
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Q18: An untreated human excreta is a health hazard. Explain.
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Q19: Name the two chemicals used in treatment of water. When they are used?
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Q20: Explain the relationship between sanitation and disease.
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Q21: State your role as an active citizen in relation to sanitation.
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Q22: State the effects of poor sanitation.
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Q23: Write short notes on Septic tank and chemical toilets.
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Q24: How water gets contaminated?
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Q25: Explain the various types of sewage.
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Chapter 18 Waste Water Story