MCQ questions for class 7 Science Chapter 18 Wastewater Story
Question 1: What is the primary source of wastewater in homes?
Rainwater
Domestic activities
Industrial discharge
Agricultural runoff
Question 2: Which of the following is a method of treating wastewater?
Throwing it into rivers
Pouring it into open fields
Disposing it in landfills
Sewage treatment plants
Question 3: What is the term for the removal of harmful substances from wastewater?
Contamination
Purification
Treatment
Filtration
Question 4: Which of the following is a primary treatment process in a sewage treatment plant?
Filtration
Aeration
Sedimentation
Disinfection
Question 5: What is the term for the settling down of solid particles in wastewater?
Filtration
Aeration
Sedimentation
Disinfection
Question 6: Which of the following is a secondary treatment process in a sewage treatment plant?
Filtration
Aeration
Sedimentation
Disinfection
Question 7: What is the term for the process of adding air to wastewater to allow aerobic bacteria to decompose organic matter?
Filtration
Aeration
Sedimentation
Disinfection
Question 8: Which of the following is a method of disinfecting treated wastewater?
Filtration
Aeration
Sedimentation
Chlorination
Question 9: What is the term for the process of killing or removing harmful microorganisms from wastewater?
Filtration
Aeration
Sedimentation
Disinfection
Question 10: Which of the following is a common method of wastewater disposal in rural areas?
Sewage treatment plants
Pit latrines
Incineration
Composting
Question 11: What is the term for the decomposition of organic matter in the absence of air?
Aerobic digestion
Anaerobic digestion
Fermentation
Oxidation
Question 12: Which of the following is a byproduct of wastewater treatment that can be used as a fertilizer?
Sludge
Effluent
Sewage
Algae
Question 13: What is the term for the treated water that is released into natural water bodies after sewage treatment?
Effluent
Sludge
Sewage
Algae
Question 14: Which of the following is a method of conserving water?
Wasteful use
Water recycling
Water pollution
Excessive irrigation
Question 15: What is the term for the use of treated wastewater for non-drinking purposes such as irrigation and industrial processes?
Water conservation
Water recycling
Water pollution
Water scarcity
Question 16: Which of the following is a method to prevent water pollution?
Dumping untreated wastewater into rivers
Industrial discharge without regulation
Proper disposal of household waste
Over-extraction of groundwater
Question 17: What is the term for the introduction of harmful substances into water bodies?
Water conservation
Water recycling
Water pollution
Water scarcity
Question 18: Which of the following is a cause of water pollution?
Conserving water
Releasing treated wastewater into rivers
Reducing industrial discharge
Practicing sustainable agriculture
Question 19: What is the term for the gradual decrease in the level of water in underground aquifers?
Water conservation
Water recycling
Water pollution
Over-extraction of groundwater
Question 20: Which of the following is a method to reduce water pollution?
Dumping untreated industrial waste
Regulating industrial discharge
Using excessive fertilizers in agriculture
Deforestation
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