This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry – Quiz 8 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 8 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following would decrease concentration of pollutants? A) Dilution. B) Deposition. C) Biomagnification. D) Inhalation. Show Answer Correct Answer: A) Dilution. 2. Which gas produced by the combustion of fossil fuels causes acid rain? A) Nitrogen. B) Sulfur dioxide. C) Ozone. D) Oxygen. Show Answer Correct Answer: B) Sulfur dioxide. 3. A pesticide that kills or controls weeds is called a(an) A) Herbicide. B) Weedicide. C) Fungicide. D) Insecticide. Show Answer Correct Answer: A) Herbicide. 4. How does ozone protect life on Earth? A) Absorbs ultraviolet radiation. B) Provides oxygen for respiration. C) Traps carbon dioxide. D) Enhances greenhouse effect. Show Answer Correct Answer: A) Absorbs ultraviolet radiation. 5. Ozone layer is present in A) Troposphere. B) Stratosphere. C) Mesosphere. D) Thermosphere. Show Answer Correct Answer: B) Stratosphere. 6. How is the purity of a water sample tested? A) By adding anhydrous cobalt(II) chloride paper. B) By checking for a fixed boiling point of exactly 100$^\circ$C. C) By adding chlorine to see if microbes are killed. D) By filtering it through carbon to see if it tastes better. Show Answer Correct Answer: B) By checking for a fixed boiling point of exactly 100$^\circ$C. 7. What is crude oil primarily composed of? A) Carbohydrates. B) Proteins. C) Hydrocarbons. D) Nucleic acids. Show Answer Correct Answer: C) Hydrocarbons. 8. Which heavy metal is used as a wood preservative? A) Mercury. B) Cadmium. C) Lead. D) Arsenic. Show Answer Correct Answer: D) Arsenic. 9. Which statement best describes water quality monitoring? A) It focuses only on the color and clarity of water. B) It measures chemical, physical, and biological indicators to assess health of ecosystems and human use. C) It relies solely on the presence of fish species to judge safety. D) It is done only for drinking water and not for recreation or agriculture. Show Answer Correct Answer: B) It measures chemical, physical, and biological indicators to assess health of ecosystems and human use. 10. Why is fluoride added to drinking water? A) To prevent algae growth. B) To prevent tooth decay. C) To soften the water. D) To raise the pH. Show Answer Correct Answer: B) To prevent tooth decay. 11. What is the minimum dissolved oxygen concentration required for fish to survive in water? A) 2 ppm. B) 5 ppm. C) 9.2 ppm. D) 11.3 ppm. Show Answer Correct Answer: B) 5 ppm. 12. Which of the following tools can be used to measure pH? A) Thermometer. B) PH meter. C) Ruler. D) Stopwatch. Show Answer Correct Answer: B) PH meter. 13. Which gas has the highest contribution to global warming? A) Oxygen. B) Carbon dioxide. C) Neon. D) Nitrogen. Show Answer Correct Answer: B) Carbon dioxide. 14. What is the chemical formula of sulfuric acid? A) HNO3. B) H2SO4. C) CO2. D) CH4. Show Answer Correct Answer: B) H2SO4. 15. What is the measure of the concentration of hydrogen ions in a solution called? A) Temperature. B) Density. C) PH. D) Volume. Show Answer Correct Answer: C) PH. 16. Decayed organic material in soil is called ..... A) Litter. B) Silt. C) Humus. D) Clay. Show Answer Correct Answer: C) Humus. 17. Which process explains how molecules spread out from an area where there are many to an area where there are fewer? A) Active transport. B) Osmosis. C) Diffusion. D) Biodegradation. Show Answer Correct Answer: C) Diffusion. 18. Name the most common greenhouse gas emitted by human activities. A) Carbon dioxide (CO2). B) Nitrous oxide (N2O). C) Sulfur hexafluoride (SF6). D) Methane (CH4). Show Answer Correct Answer: A) Carbon dioxide (CO2). 19. Plants absorb nutrients through which processes mentioned in the material? A) Filtration and evaporation. B) Diffusion, osmosis, and active transport. C) Photosynthesis and respiration. D) Condensation and sublimation. Show Answer Correct Answer: B) Diffusion, osmosis, and active transport. 20. Which of the following statements describes one characteristic shared by ALL biodegradable substances? A) They can be broken down by inorganic compounds. B) They can be broken down by simple organisms. C) They decompose faster at low temperatures. D) They decompose faster in dry conditions. Show Answer Correct Answer: B) They can be broken down by simple organisms. 21. What parameters are commonly assessed in water quality testing? A) Salinity, alkalinity, color, temperature. B) Chlorine, fluoride, ammonia, viscosity. C) PH, dissolved oxygen, turbidity, total dissolved solids, nutrients, heavy metals, microbial contaminants. D) Suspended solids, conductivity, hardness, odor. Show Answer Correct Answer: C) PH, dissolved oxygen, turbidity, total dissolved solids, nutrients, heavy metals, microbial contaminants. 22. The internal energy of a system (U) is the sum of: A) Only kinetic energy of molecules. B) Only potential energy between molecules. C) Kinetic energy of molecules and potential energy between them. D) Neither kinetic nor potential energy. Show Answer Correct Answer: C) Kinetic energy of molecules and potential energy between them. 23. Climate change has become an environmental issue. Which of the following chemicals is one of the greatest contributors to climate change? A) DDT. B) CO$_{2}$. C) CFC. D) O$_{2}$. Show Answer Correct Answer: B) CO$_{2}$. 24. Which of the following is a measurement of water pollution? A) PSC. B) PCB. C) BOD. D) COD. Show Answer Correct Answer: C) BOD. 25. Which international treaty aims to protect human health and the environment from mercury pollution? A) Kyoto Protocol. B) Montreal Protocol. C) Paris Agreement. D) Minamata Convention. Show Answer Correct Answer: D) Minamata Convention. ← PreviousNext →Related QuizzesClass 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 1Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 2Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 3Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 4Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 5Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 6Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 7Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 9Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 10Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books