MCQ Questions for Class 7 Science: Ch 18 Wastewater Story

MCQ Questions for Class 7 Science: Ch 18 Wastewater story

1. 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
► (d) Water coming out of a laundry

2. Which one is not a of household garbage
(a) Vegetable peels
(b) Dal packets
(c) Crockery pieces
(d) Cow dung
► (d) Cow dung

3. The process of waste treatment is called
(a) Water treatment
(b) Pollutant separation
(c) Sewage treatment
(d) Chlorination
► (c) Sewage treatment

4. Sanitation in the cities is the function of
(a) Municipal corporation
(b) Non-government organisation
(c) Individual person
(d) Societies of locality
► (a) Municipal corporation

5. An example of source reduction of waste is
(a) Burning
(b) Making paper aero planes
(c) Throwing things that are old
(d) Backward composting
► (d) Backward composting

6. Which plant is suggested for purification of sewage pond water?
(a) Waste water plant        
(b) Eucalyptus plant
(c) Urena plant                 
(d) None of these
► (b) Eucalyptus plant

7. Jaundice affects which organ?
(a) Lung
(b) Liver
(c) Heart
(d) Kidney
► (b) Liver

8. Which one is not an organic waste?
(a) Vegetable peels
(b) Paper
(c) DDT
(d) Cotton cloths
► (c) DDT

9. The sludge waste originates from
(a) kitchen
(b) toilets
(c) industrial organizations
(d) commercial organizations
► (a) kitchen

10. What is the full form of WWTP?
(a) Waste water travel plant
(b) Wastewater treatment plant
(c) Waste water therapy plant
(d) Waste water tropical plant
► (b) Wastewater treatment plant

11. Water borne disease is 
(a) Diabetes
(b) Cancer 
(c) Cholera
(d) Appendicitis
► (c) Cholera

12. Biodegradable wastes are generally
(a) Blended
(b) Synthetic
(c) Organic
(d) Inorganic
► (c) Organic

13. Treatment plants
(a) reduce pollutants in waste water to a level where nature can take care of it.
(b) makes the waste water free of all pollutants
(c) Both the above are correct
(d) None of these
► (a) reduce pollutants in waste water to a level where nature can take care of it.

14. The percentage of water in activated sludge is about
(a) 90%                            
(b) 92%
(c) 95%                            
(d) 97%
► (d) 97%

15. The network of drainage pipe to carry waste water is called
(a) Sewer system
(b) Water supply system
(c) Drainage
(d) Waste water supply
► (a) Sewer system

16. Addition of harmful substance in water leads to
(a) Algal bloom
(b) Microbial growth
(c) Water pollution
(d) High oxygen demand
► (c) Water pollution

17. Passing chlorine gas through drinking water to disinfect it is called
(a) Cleaning
(b) Chlorination
(c) Aeration
(d) Sterilization
► (b) Chlorination

18. Adding air to treated water is called
(a) Fluorination
(b) Chlorination
(c) Aeration
(d) Oxygenation
► (c) Aeration

19. Sewage refers to waste water that is released by
(a) homes                         
(b) industries
(c) offices                         
(d) All of the above
► (d) All of the above

20. Select the disease that is not caused by improper disposal of sewage 
(a) Heart attack
(b) Jaundice
(c) Cholera 
(d) Typhoid
► (a) Heart attack

21. Select those which are organic substances present in waste water.
(a) pesticides
(b) herbicides
(c) fruit and vegetable waste
(d) All of the above
► (d) All of the above

22. Which of the following is non-biodegradable waste?
(a) Cotton cloths
(b) Vegetable and fruit peels.
(c) Plants and animals excreta
(d) Plastic
► (d) Plastic

23. Liquid waste consisting of suspended impurities is called _____.
(a) sewage           
(b) contaminant
(c) slurry                           
(d) sludge
► (a) sewage           

24. The impurities present in sewage may consist of
(a) organic substances     
(b) inorganic substances
(c) Nutrients
(d) All of the above
► (d) All of the above

25. Disinfection can be removed by
(a) Chlorination
(b) Acidity
(c) Alkaline
(d) pH change
► (a) Chlorination

26. Open drain cause ____________ condition.
(a) Unhygienic
(b) Temperate
(c) Humid
(d) Hygienic
► (a) Unhygienic
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