This quiz works best with JavaScript enabled. Home > Class 8 > Class 8 Science Chapter 18 Pollution Of Air And Water ā Quiz 7 š Homepage š Download PDF Books š Premium PDF Books Class 8 Science Chapter 18 Pollution Of Air And Water Quiz 7 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following is NOT a coagulant used on water purification? A) Chlorine. B) Phosphate. C) Nitrite. D) Fluoride. Show Answer Correct Answer: C) Nitrite. 2. How can industrial effluent be treated to remove toxic substances? A) Boiling. B) Adding chlorine tablets. C) Chemical treatment. D) Filtration through muslin cloth. Show Answer Correct Answer: C) Chemical treatment. 3. How much amount of co2 is there in the atmosphere. A) 100%. B) 0.3%. C) 0.00000003%. D) 0.003. Show Answer Correct Answer: D) 0.003. 4. The pond contains clean water.Which of the activities will cause least water pollution A) Washing clothes in the pond. B) Animals bathing in the pond. C) Washing vehicles in the pond. D) Swimming in the pond. Show Answer Correct Answer: D) Swimming in the pond. 5. If we combine the two longest rivers in the world it will be equal to the registered vehicles in Delhi if they are lined up one after other. What is the name of the these rivers. A) Ganga & Nile rivers. B) Nile & Amazon rivers. C) Yamuna & Amazon rivers. D) Yellow & Amazon rivers. Show Answer Correct Answer: B) Nile & Amazon rivers. 6. Small particles of solids and liquids suspended in air ..... A) Pollutants. B) Particulates. C) Contaminants. D) None of the above. Show Answer Correct Answer: B) Particulates. 7. WHICH DIESEASES IS CAUSED BY AIR POLLUTION A) LUNG CANCER. B) Stroke. C) ASTHMA. D) ALL OF THESE. Show Answer Correct Answer: D) ALL OF THESE. 8. The most widely used solvent is A) Air. B) Acid. C) Nitrogen. D) Water. Show Answer Correct Answer: D) Water. 9. When untreated sewage and fertilisers wash into water, which process results? A) Bioaccumulation. B) Biomagnification. C) Eutrophication. D) Decomposition. Show Answer Correct Answer: C) Eutrophication. 10. Which gas is the major pollutant of air? A) Carbon monoxide. B) Nitrogen. C) Oxygen. D) Propane. Show Answer Correct Answer: A) Carbon monoxide. 11. Water shortages can be created by A) Human consumption. B) Weather related issues like drought. C) Human withdrawal. D) All of these reasons. Show Answer Correct Answer: D) All of these reasons. 12. A large percentage of emissions resulting in air pollution today comes from ..... A) Motor vehicles. B) Factories. C) Farm animals. D) Ozone depletion. Show Answer Correct Answer: A) Motor vehicles. 13. Global Warming is caused due to high concentration of Carbon Dioxide A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 14. The increase in concentration of which gas is not responsible for Global Warming? A) Sulphur dioxide. B) Carbon dioxide. C) Nitrogen. D) Methane. Show Answer Correct Answer: C) Nitrogen. 15. When were the initiatives, Ganga Action Plan and National Mission For Clean Ganga launched respectively? A) 1947, 2009. B) 1985, 2016. C) 2001, 2019. D) 1984, 2017. Show Answer Correct Answer: B) 1985, 2016. 16. Scientists monitor ozone in the upper atmosphere and at ground level. Changing concentrations of each can cause health problems for people. Which set of changes would cause the MOST health concerns? A) An increase in both atmospheric and ground level ozone. B) A decrease in both atmospheric and ground level ozone. C) An increase in atmospheric ozone and a decrease in ground level ozone. D) A decrease in atmospheric ozone and an increase in ground level ozone. Show Answer Correct Answer: D) A decrease in atmospheric ozone and an increase in ground level ozone. 17. Why are scientists concerned with ozone depletion in the upper atmosphere? A) Because it causes greater levels of ground-level ozone. B) Because it allows ultraviolet radiation to reach Earth's surface. C) Because it increases the amount of smog in highly populated cities. D) Because it decreases global temperatures by decreasing incoming solar radiation. Show Answer Correct Answer: B) Because it allows ultraviolet radiation to reach Earth's surface. 18. Which of the following disease is not caused by drinking of river contaminated with untreated sewage A) Cholera. B) Typhoid. C) Tuberculosis. D) Diarrhea. Show Answer Correct Answer: C) Tuberculosis. 19. Water that is fit to drink is also referred to as A) Portable water. B) Potable Water. C) Edible water. D) None of the above. Show Answer Correct Answer: B) Potable Water. 20. Contaminated water and polluted water are the same. A) TRUE. B) FALSE. C) All the above. D) None of the above. Show Answer Correct Answer: B) FALSE. 21. ..... % OF THE WORLD POPULATION IS WITHOUT SAFE DRINKING WATER. A) 21%. B) 29%. C) 25%. D) 11%. Show Answer Correct Answer: C) 25%. 22. What is the formula of ozone? A) O5. B) Be. C) O10. D) O2. Show Answer Correct Answer: B) Be. 23. WHAT DOES SPM STAND FOR:- A) Sodium, potasium, magnasium. B) SODIUM PARTICULATES MATTER. C) SOLLUTION PARTISEPATES MATTER. D) ALL OF THESE. Show Answer Correct Answer: B) SODIUM PARTICULATES MATTER. 24. Which of the following is not a source of air pollution? A) Automobile exhaust. B) Burning of firewood. C) Windmill. D) Power plant. Show Answer Correct Answer: C) Windmill. 25. ..... is created when chemicals in polluted air react with water vapor to form harmful compounds which can damage plants, waterways, metals and stone. A) Ozone. B) Radon. C) Toxic sludge. D) Acid rain. 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