This quiz works best with JavaScript enabled. Home > Class 8 > Class 8 Science Chapter 18 Pollution Of Air And Water ā Quiz 2 š Homepage š Download PDF Books š Premium PDF Books Class 8 Science Chapter 18 Pollution Of Air And Water Quiz 2 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Individuals can reduce air pollution by ..... A) Using less electricity. B) Using motor vehicles less often. C) Buying local goods. D) All of these. Show Answer Correct Answer: D) All of these. 2. Which of the following in river is harmful to the aquatic animals and human beings? A) Chloride ion. B) Potassium ion. C) Heavy metal ions. D) Sodium ions. Show Answer Correct Answer: C) Heavy metal ions. 3. Bhopal tragedy was caused due to A) Air pollution. B) Emission of poisonous gas. C) Water pollution. D) Leakage of poisonous gas. Show Answer Correct Answer: D) Leakage of poisonous gas. 4. Which of the following is not a way to conserve water? A) Replace. B) Reduce. C) Reuse. D) Recycle. Show Answer Correct Answer: A) Replace. 5. How much percentage of earth is covered with water? A) 8%. B) 27%. C) 75%. D) 34%. Show Answer Correct Answer: C) 75%. 6. The contamination of water by undesirable substances is called A) Pollution. B) Air Pollution. C) Water Pollution. D) None of the above. Show Answer Correct Answer: C) Water Pollution. 7. If the vehicles registered in Delhi are lined up one after the other, the total length would be nearly equal to the combined lengths of the two longest rivers in the world, ..... and ..... A) Nile. B) Amazon. C) Both a and b. D) Brahmaputra. Show Answer Correct Answer: C) Both a and b. 8. When air is contaminated by unwanted substances which have a harmful effect on both the living and the non-living, it is referred to as ..... pollution. A) Water. B) Air. C) Sound. D) Soil. Show Answer Correct Answer: B) Air. 9. The key to reducing air pollution is to control ..... A) Methane gas. B) Overpopulation. C) Ozone depletion. D) Emissions. Show Answer Correct Answer: D) Emissions. 10. Which of the following method is suitable to clean water to make it fit for drinking? A) Candle type filter. B) Boiling. C) Chlorination. D) All of the above. Show Answer Correct Answer: D) All of the above. 11. Which of the following Chemicals cause pollution by damaging the Ozone layer? A) Nitrogen oxides. B) Hydrochlorofluorocarbons. C) Carbon dioxide. D) Chlorofluorocarbons. Show Answer Correct Answer: D) Chlorofluorocarbons. 12. THE SUBSTANCES, WHICH CONTAMINATE THE AIR, ARE CALLED ..... A) AIR POLLUTION. B) AIR POLLUTANTS. C) AIR COMPONENTS. D) POLLUTION. Show Answer Correct Answer: B) AIR POLLUTANTS. 13. Trees help in reducing the pollution of our environment. Lakhs of trees are planted by people in the month of July every year. The occasion is called A) Forest Conservation Day. B) Forest festival. C) Plantation month. D) Wildlife week. Show Answer Correct Answer: B) Forest festival. 14. The harmful effects of water pollution are A) Water gets contaminated. B) Water borne diseases. C) Fishes and frogs die. D) All the above. Show Answer Correct Answer: D) All the above. 15. The Clean Air Act-regulates vehicle emissions. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 16. Which of the following is not a green house gas A) Carbon dioxide. B) Nitrous oxide. C) Methane. D) Nitrogen. Show Answer Correct Answer: D) Nitrogen. 17. The gas used in refrigerating appliance causing serious damage to ozone is A) CFCs. B) MFCs. C) LPCS. D) DPCs. Show Answer Correct Answer: A) CFCs. 18. Liquids cannot pass through A) Permeable. B) Erosion. C) Impermeable. D) None of the above. Show Answer Correct Answer: C) Impermeable. 19. Metals that can be used as wire are ..... A) Metallic. B) Shiny. C) Malleable. D) Dukes. Show Answer Correct Answer: D) Dukes. 20. Most polluted river in the world is A) Yamuna. B) Cavery. C) Chenab. D) Ganga. Show Answer Correct Answer: D) Ganga. 21. Which of the following are used in electric water filters to kill all the harmful microorganisms present in tap water and make it absolutely fit for drinking A) Infrared radiation. B) Ultraviolet radiation. C) Gamma radiation. D) Visible radiation. Show Answer Correct Answer: B) Ultraviolet radiation. 22. What cause air pollution? A) Factories produce too much waste water and oil. B) Factories produce too much smoke. C) All the above. D) None of the above. Show Answer Correct Answer: B) Factories produce too much smoke. 23. Which of the following is a harmful effect of eutrophication? A) Increase in oxygen quantity in the water. B) Increase in nutrient content. C) Blocking of sunlight. D) None of the above. Show Answer Correct Answer: C) Blocking of sunlight. 24. THE OZONE LAYER PROTECTS US FROM THE BAD EFFECTS OF A) THE SUN'S UV RAYS. B) CARBON DIOXIDE. C) CFCs. D) ALL OF THESE. Show Answer Correct Answer: A) THE SUN'S UV RAYS. 25. Gases released from power plants mix with water vapor in the sky to make ..... A) Smog. B) Acid rain. C) Global warming. D) Particulate matter. 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