MCQ Questions for Class 7 Science Chapter 18 : NCERT solutions for Class 7 Science MCQs Chapter 18Wastewater Story “” with Answers PDF Free Download prepared here according to the latest CBSE syllabus and NCERT curriculum. Class 7 Science MCQs Multiple Choice Questions for all Chapter.
MCQ Questions for Class 7 Science Chapter 18 Wastewater Story with answer pdf
Q1. 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
Answer: (d) Water coming out of a laundry
Q2. Water that is not fit for use is called
(a) clean water
(b) wastewater
(c) both (a) and (b)
(d) none of these
Answer: (b) wastewater
Q3. Which one of the following is a quality of wastewater?
(a) Foul smell
(b) Bad taste
(c) Dirty look
(d) All of these
Answer: (d) All of these
Q4. Untreated human excreta is a:
(a) waste water
(b) health hazard
(c) manure
(d) none of these
Answer: (b) health hazard
Q5. Which one is not a of household garbage
(a) Vegetable peels
(b) Dal packets
(c) Crockery pieces
(d) Cow dung
Answer: (d) Cow dung
Q6. Which of the following is not a source of wastewater?
(a) Sewers
(b) Homes
(c) Industries
(d) Hospitals
Answer: (a) Sewers
Q7. Period 2005-2015 is being celebrated as the international decade for action on
(a) water for life
(b) education for all
(c) global war
(d) terrorism
Answer: (a) water for life
Q8. Which process removes the solids like foeces and other substances from the waste water:
(a) chlorination
(b) decomposition
(c) evaporation
(d) sand and grit removal
Answer: (d) sand and grit removal
Q9. The process of waste treatment is called
(a) Water treatment
(b) Pollutant separation
(c) Sewage treatment
(d) Chlorination
Answer: (c) Sewage treatment
Q10. The period of International Decade for action on ‘Water for Life’ is
(a) 2000 – 2010
(b) 2005 – 2015
(c) 2010 – 2020
(d) 2003 – 2013
Answer: (b) 2005 – 2015
Q11. In sewerage manholes are located at every
(a) 20-25 m
(b) 50-60 m
(c) 90-100 m
(d) 100-110 m
Answer: (b) 50-60 m
Q12. 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
Answer: (b) biogas plant
Q13. Sanitation in the cities is the function of
(a) Municipal corporation
(b) Non-government organisation
(c) Individual person
(d) Societies of locality
Answer: (a) Municipal corporation
Q14. 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
Answer: (a) cleaning of water
Q15. Which one of the following is a step in wastewater treatment?
(a) Aeration
(b) Filtration
(c) Chlorination
(d) All of these
Answer: (d) All of these
Q16. The biogas product is used as a source of:
(a) rains
(b) oils
(c) energy
(d) all of these
Answer: (c) energy
Q17. An example of source reduction of waste is
(a) Burning
(b) Making paper aero planes
(c) Throwing things that are old
(d) Backward composting
Answer: (d) Backward composting
Q18. Which of the following is a part of inorganic impurities of the sewage?
(a) Pesticides
(b) Urea
(c) Phosphates
(d) Vegetable waste
Answer: (c) Phosphates
Q19. Sludge in separate tanks is decomposed to get biogas by
(a) yeasts
(b) aerobic bacteria
(c) anaerobic bacteria
(d) none of these
Answer: (c) anaerobic bacteria
Q20. What helps to clean the clarified water:
(a) aerobic bacteria
(b) anaerobic bacteria
(c) both (a) and (b)
(d) none of these
Answer: (a) aerobic bacteria
