This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry – Quiz 22 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 22 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. How can the chemistry triangle concept be applied to teach global warming and climate change? A) By exploring sub-microscopic interactions. B) All of the above. C) By focusing on observable impacts at the macro level. D) By using chemical symbols and equations at the symbolic level. Show Answer Correct Answer: B) All of the above. 2. The most important basic species in the atmosphere is A) Gas phase carbon monoxide. B) Gas-phase ammonia, NH3. C) Calcium carbonate. D) Calcium oxide. Show Answer Correct Answer: B) Gas-phase ammonia, NH3. 3. Silent valley is so called because A) Absence of noisy cicadas. B) Water there flows silently. C) Absence of frogs. D) Absence of bees. Show Answer Correct Answer: A) Absence of noisy cicadas. 4. What happens when a lake becomes hypereutrophic? A) Hypolimnion has high dissolved oxygen. B) Heavy metals are released from sediments. C) Water has low phosphorus and chlorophyll. D) Turbidity of water decreases. Show Answer Correct Answer: B) Heavy metals are released from sediments. 5. What are enzymes? A) Large molecules that help enzymes function. B) Special protein molecules that regulate chemical reactions in living organisms. C) Inorganic substances used to create vitamins. D) None of the above. Show Answer Correct Answer: B) Special protein molecules that regulate chemical reactions in living organisms. 6. You dig a small hole in the soil and the next day it rains. The hole fills with water, but does not empty even after several days of dry weather. What is the soil mostly made of? A) Clay. B) Sand. C) Humus. D) Silt. Show Answer Correct Answer: A) Clay. 7. During mining operations, moist soil compared to dry soil: A) Has less ability to retain heat. B) Has greater ability to retain heat. C) Cannot retain heat. D) Has no difference in heat retention. Show Answer Correct Answer: B) Has greater ability to retain heat. 8. Which of the following statements describes one characteristic shared by 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 lower temperatures. D) They decompose faster in dry conditions. Show Answer Correct Answer: B) They can be broken down by simple organisms. 9. Lethal dose (LD$_{50}$) values are determined by the amount of a substance that: A) Kills at least 50 individuals of the test population exposed to the substance. B) Kills a test population when given at least 50 ml of the substance. C) Kills at least 50% of the test population exposed to the substance. D) Kills a test population when given at least 50g of the substance. Show Answer Correct Answer: C) Kills at least 50% of the test population exposed to the substance. 10. Which statement best defines pollution according to the section? A) Any change in the environment caused by humans. B) Any harmful change to the environment caused naturally or by humans. C) Only human-made chemical spills. D) Natural changes like weathering that affect landscapes. Show Answer Correct Answer: B) Any harmful change to the environment caused naturally or by humans. 11. The pH of severely acidified lakes can fall below: A) 5.0. B) 4.0. C) 3.5. D) 2.0. Show Answer Correct Answer: C) 3.5. 12. What is global warming? A) A decrease in Earth's temperature. B) The trapping of heat by greenhouse gases. C) The cooling of the ozone layer. D) The natural balance of Earth's temperature. Show Answer Correct Answer: B) The trapping of heat by greenhouse gases. 13. Which ion in water helps to make teeth enamel harder? A) Fluoride ion. B) Chlorine ion. C) Sulphur ion. D) Calcium ion. Show Answer Correct Answer: A) Fluoride ion. 14. Which of the following are not what chemicals or nutrient are used for? A) Energy. B) Growth. C) Cell Repair. D) Photosynthesis. Show Answer Correct Answer: D) Photosynthesis. 15. Taj Mahal is being slowly disfigured and discolored. This is primarily due to A) Acid rain. B) Water pollution. C) Soil pollution. D) Global warming. Show Answer Correct Answer: A) Acid rain. 16. Which is not a global threat? A) Health. B) Scarcity of land. C) Human rights. D) Water resources. E) Security. Show Answer Correct Answer: B) Scarcity of land. 17. CFCl2 is responsible for the decomposition of ozone to oxygen. Which of the following reacts with ozone to form oxygen? A) Cl2. B) Cl-. C) F-. D) Cl'. Show Answer Correct Answer: D) Cl'. 18. In general, the organisms that are most useful as indicators of water quality are A) Algae. B) Birds and fish. C) Microinvertebrates. D) Macroinvertebrates. Show Answer Correct Answer: D) Macroinvertebrates. 19. Which of the following is an example of an indicator species? A) African Elephant. B) Polar Bear. C) Lichen. D) Blue Whale. Show Answer Correct Answer: C) Lichen. 20. Organisms who feed directly on producers are called A) Consumers. B) Primary consumers. C) Secondary consumers. D) None. Show Answer Correct Answer: B) Primary consumers. 21. Sardar Sarovar Project is associated with which movement A) Tehri Dam Conflict. B) Save Ganga Project. C) Narmada Bachao Andolan. D) Jungle Bachao Andolan. Show Answer Correct Answer: C) Narmada Bachao Andolan. 22. Acid rain is defined as precipitation with a pH less than: A) 6.0. B) 5.6. C) 7.0. D) 4.5. Show Answer Correct Answer: B) 5.6. 23. What organisms do scientists think evolved first? A) Bacteria & algae. B) Fish & grass. C) Birds & trees. D) Humans & animals. Show Answer Correct Answer: A) Bacteria & algae. 24. A chemical in food, used for energy, growth, body building and cell repair A) Enzyme. B) Nutrient. C) Oxidant. D) Indicator. Show Answer Correct Answer: B) Nutrient. 25. What is the purpose of the base in an antacid? A) To increase stomach acid. B) To neutralize stomach acid. C) To produce more acid. D) To create harmful compounds. Show Answer Correct Answer: B) To neutralize stomach acid. ← 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 8Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 9Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books