MCQ questions for class 8 Science Chapter 18 Pollution of Air and Water
Question 1: What is the term for the presence or introduction into the environment of contaminants in concentrations that are harmful to living organisms?
Evaporation
Condensation
Pollution
Purification
Question 2: Which of the following is a major source of air pollution?
Rain
Wind
Vehicles
Sunlight
Question 3: What is the term for the harmful substances present in air that can cause health problems?
Dust
Pollutants
Oxygen
Nitrogen
Question 4: Which of the following gases is responsible for the greenhouse effect?
Oxygen
Nitrogen
Carbon dioxide
Methane
Question 5: What is the term for the process of converting liquid water into vapor?
Evaporation
Condensation
Precipitation
Transpiration
Question 6: Which of the following is a consequence of water pollution?
Increased biodiversity
Improved water quality
Decreased oxygen levels
Enhanced aquatic life
Question 7: What is the term for the introduction of harmful substances into water bodies?
Evaporation
Condensation
Water purification
Water pollution
Question 8: Which of the following is a non-point source of water pollution?
Factory discharge
Sewage treatment plant
Oil spill
Agricultural runoff
Question 9: What is the term for the presence of excessive nutrients in a water body, often leading to the overgrowth of algae?
Eutrophication
Desalination
Filtration
Distillation
Question 10: Which of the following is a renewable source of energy that does not contribute to air pollution?
Coal
Natural gas
Solar power
Nuclear power
Question 11: What is the term for the solid particles and liquid droplets suspended in the air?
Dust
Smoke
Fog
Smog
Question 12: Which of the following pollutants is a common component of smog?
Oxygen
Nitrogen
Carbon dioxide
Particulate matter
Question 13: What is the term for the precipitation containing high levels of acids, often caused by air pollution?
Snowfall
Hailstorm
Acid rain
Thunderstorm
Question 14: Which of the following pollutants can lead to respiratory problems and other health issues?
Oxygen
Nitrogen
Carbon dioxide
Particulate matter
Question 15: What is the term for the contamination of water bodies with harmful substances?
Evaporation
Condensation
Water purification
Water pollution
Question 16: Which of the following is a common water pollutant from industrial discharges?
Oxygen
Nitrogen
Phosphates
Carbon dioxide
Question 17: What is the term for the process of removing impurities from water to make it safe for consumption?
Evaporation
Condensation
Filtration
Distillation
Question 18: Which of the following is a natural source of air pollution?
Volcanic activity
Factories
Vehicles
Deforestation
Question 19: What is the term for the layer of the atmosphere that protects the Earth from the harmful effects of the sun's ultraviolet (UV) radiation?
Troposphere
Stratosphere
Mesosphere
Thermosphere
Question 20: Which of the following actions can help reduce air pollution?
Planting more trees
Increasing vehicle emissions
Burning fossil fuels
Disposing of waste in water bodies
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