MCQ Questions for Class 7 Science Chapter 18 Wastewater Story with Answers

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All questions answers in the last paragraph

Q1. What helps to clean the clarified water:

(A) aerobic bacteria
(B) anaerobic bacteria
(C) both (A) and (B)
(D) none of these

Q2. Sludge in separate tanks is decomposed to get biogas by

(A) yeasts
(B) aerobic bacteria
(C) anaerobic bacteria
(D) none of these

Q3. Which of the following is a part of inorganic impurities of the sewage?

(A) Pesticides
(B) Urea
(C) Phosphates
(D) Vegetable waste

Q4. An example of source reduction of waste is

(A) Burning
(B) Making paper aero planes
(C) Throwing things that are old
(D) Backward composting

Q5. The biogas product is used as a source of:

(A) rains
(B) oils
(C) energy
(D) all of these

Q6. Which of the following is wastewater?

(A) Water trickling from a damaged tap
(B) Water coming out of a shower
(C) Water flowing in a river
(D) Water coming out of a laundry

Q7. Water that is not fit for use is called

(A) clean water
(B) wastewater
(C) both (A) and (B)
(D) none of these

Q8. Which one of the following is a quality of wastewater?

(A) Foul smell
(B) Bad taste
(C) Dirty look
(D) All of these

Q9. Untreated human excreta is a:

(A) waste water
(B) health hazard
(C) manure
(D) none of these

Q10. Which one is not a of household garbage

(A) Vegetable peels
(B) Dal packets
(C) Crockery pieces
(D) Cow dung

Q11. Which one of the following is a step in wastewater treatment?

(A) Aeration
(B) Filtration
(C) Chlorination
(D) All of these

Q12. The process of removing pollutants in water before it enter a water body is called

(A) cleaning of water
(B) refining
(C) filtering of water
(D) none of these

Q13. Sanitation in the cities is the function of

(A) Municipal corporation
(B) Non-government organisation
(C) Individual person
(D) Societies of locality

Q14. Excreta from the toilet seats flow through covered drains into a chemicals:

(A) chemicals
(B) biogas plant
(C) vermi-processing toilets
(D) none of these

Q15. In sewerage manholes are located at every

(A) 20-25 m
(B) 50-60 m
(C) 90-100 m
(D) 100-110 m

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