Environmental Science

  Unit 2: Pollution and Its Types 1. Electrostatic precipitator is used for: A) Water purification B) Air pollution control C) Soil treatment D) Noise control Answer: B 2. Water pollution is caused by: A) Industrial waste B) Sewage C) Agricultural chemicals D) All of the above Answer: D 3. BOD stands for: A) Biological Oxygen Demand B) Basic Oxygen Demand C) Bacterial Oxygen Demand D) Balanced Oxygen Demand Answer: A 4. High BOD indicates: A) Clean water B) Polluted water C) Neutral water D) Drinking water Answer: B 5. COD stands for: A) Chemical Oxygen Demand B) Carbon Oxygen Demand C) Chemical Oxide Demand D) Clean Oxygen Demand Answer: A 6. Normal pH of drinking water is around: A) 3 B) 5 C) 7 D) 10 Answer: C 7. Turbidity in water means: A) Cloudiness of water B) Color of water C) Temperature of water D) Smell of water Answer: A 8. Primary wastewater treatment mainly removes: A) Dissolved impurities B) Suspended solids ...

Unit 1: Ecosystem 1. An ecosystem consists of: A) Only plants B) Only animals C) Living and non-living components D) Only microorganisms Answer: C 2. The non-living components of an ecosystem are called: A) Biotic factors B) Abiotic factors C) Producers D) Consumers Answer: B 3. Plants in an ecosystem are known as: A) Consumers B) Producers C) Decomposers D) Parasites Answer: B 4. Animals that depend on plants for food are called: A) Carnivores B) Omnivores C) Herbivores D) Parasites Answer: C 5. Organisms that break down dead matter are called: A) Producers B) Consumers C) Decomposers D) Herbivores Answer: C 6. Which of the following is a natural ecosystem? A) Aquarium B) Crop field C) Forest D) Garden Answer: C 7. Which ecosystem is found in water? A) Desert ecosystem B) Forest ecosystem C) Aquatic ecosystem D) Grassland ecosystem Answer: C 8. The movement of carbon through living and non-living components is called: A) Nitro...