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Environmental Engineer PE Level II Practice
Questions WITH CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A |INSTANT
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1. Which of the following is the primary contaminant of concern in groundwater impacted by agricultural activities? A. Lead B. Nitrates C. Mercury D. PCBs Correct Answer: B. Nitrates Rationale: Nitrates are commonly found in groundwater near agricultural areas due to fertilizer runoff, which can lead to methemoglobinemia ("blue baby syndrome"). 2. The main advantage of using a constructed wetland for wastewater treatment is: A. High chemical usage B. Low energy requirements C. Rapid pathogen removal D. Ability to treat industrial hazardous waste
Correct Answer: B. Low energy requirements Rationale: Constructed wetlands rely on natural processes, such as plant uptake and microbial activity, reducing energy needs compared to conventional treatment systems.
3. Which of the following is NOT considered a conventional pollutant under the Clean Water Act? A. Biochemical oxygen demand (BOD) B. Total suspended solids (TSS) C. Mercury D. Fecal coliform Correct Answer: C. Mercury Rationale: Mercury is classified as a toxic pollutant, not a conventional pollutant. Conventional pollutants typically include BOD, TSS, fecal coliform, pH, and oil & grease. 4. What is the primary mechanism for nitrogen removal in an activated sludge process? A. Filtration B. Nitrification and denitrification C. Chlorination D. Sedimentation Correct Answer: B. Nitrification and denitrification Rationale: Ammonia is converted to nitrate via nitrification and
7. In a sanitary landfill, the primary concern associated with methane gas is: A. Odor control B. Greenhouse gas emissions and explosion risk C. Leachate generation D. Vector control Correct Answer: B. Greenhouse gas emissions and explosion risk Rationale: Methane is highly flammable and a potent greenhouse gas, making its management in landfills critical. 8. The main purpose of a riparian buffer zone is to: A. Increase agricultural productivity B. Prevent soil erosion and improve water quality C. Provide recreational areas only D. Reduce local temperature Correct Answer: B. Prevent soil erosion and improve water quality Rationale: Riparian buffers filter runoff, stabilize streambanks, and protect aquatic ecosystems. 9. Which of the following best describes the concept of “sustainability” in environmental engineering? A. Maximizing short-term profit B. Meeting present needs without compromising future
generations’ ability to meet theirs C. Eliminating all waste D. Reducing construction costs Correct Answer: B. Meeting present needs without compromising future generations’ ability to meet theirs Rationale: Sustainability balances environmental, economic, and social considerations to protect long-term resources.
10. The most common biological indicator of water contamination is: A. Salmonella B. Total coliform C. Lead D. Dissolved oxygen Correct Answer: B. Total coliform Rationale: Total coliform bacteria are widely used to indicate potential fecal contamination and overall microbiological water quality. 11. Which of the following is the most significant source of volatile organic compounds (VOCs) in urban air? A. Industrial emissions B. Vehicle exhaust
for treatment removes dissolved pollutants and prevents further plume migration.
14. Which of the following is a key indicator of eutrophication in freshwater systems? A. High dissolved oxygen B. Algal blooms C. Low nutrient levels D. Decreased turbidity Correct Answer: B. Algal blooms Rationale: Excess nitrogen and phosphorus lead to algal overgrowth, which depletes oxygen and harms aquatic life. 15. The primary regulatory standard for drinking water in the U.S. is established by: A. EPA Safe Drinking Water Act B. OSHA C. CWA National Pollutant Discharge Elimination System D. Clean Air Act Correct Answer: A. EPA Safe Drinking Water Act Rationale: The Safe Drinking Water Act sets maximum contaminant levels and protects public health in drinking water.
16. Which of the following treatment processes is most effective for removing pathogens in wastewater? A. Coagulation B. Filtration C. Disinfection (chlorination or UV) D. Sedimentation Correct Answer: C. Disinfection (chlorination or UV) Rationale: Disinfection destroys pathogenic microorganisms, reducing disease risk from treated water. 17. The main factor affecting landfill leachate composition is: A. Local climate and waste composition B. Distance from roads C. Type of landfill liner only D. Nearby vegetation Correct Answer: A. Local climate and waste composition Rationale: Leachate chemistry is influenced by rainfall, temperature, and the type of waste decomposing in the landfill. 18. Which of the following is a common approach for controlling stormwater runoff in urban areas? A. Permeable pavements B. Deep well injection
21. Which of the following processes is primarily used for phosphorus removal in wastewater treatment? A. Coagulation and chemical precipitation B. Chlorination C. Sedimentation only D. Nitrification Correct Answer: A. Coagulation and chemical precipitation Rationale: Phosphorus is often removed by adding metal salts (alum, ferric chloride) that precipitate phosphate as solids. 22. The term “first flush” in stormwater management refers to: A. Initial runoff with high pollutant concentration B. The last runoff after rainfall C. Any runoff entering a treatment plant D. Overflow in wastewater treatment Correct Answer: A. Initial runoff with high pollutant concentration Rationale: The first portion of stormwater typically carries most pollutants from surfaces into waterways. 23. The key advantage of using membrane filtration over conventional sedimentation is:
A. Lower cost B. Ability to remove very fine particles and microorganisms C. Simpler maintenance D. No need for pretreatment Correct Answer: B. Ability to remove very fine particles and microorganisms Rationale: Membranes can filter out particles as small as viruses, which conventional sedimentation cannot remove effectively. 24. Which of the following best represents the primary goal of an industrial wastewater pretreatment program? A. Reduce water temperature only B. Protect municipal treatment systems and meet discharge regulations C. Increase sludge production D. Remove only solids Correct Answer: B. Protect municipal treatment systems and meet discharge regulations Rationale: Pretreatment removes pollutants that could interfere with municipal plant operations or violate discharge standards.
25. Which greenhouse gas has the highest global warming potential per unit mass?
C. Carbon monoxide D. Lead Correct Answer: B. Nitrogen oxides (NOx) and volatile organic compounds (VOCs) Rationale: NOx and VOCs react in sunlight to produce ozone and other photochemical oxidants, creating smog.
28. In groundwater monitoring, the primary purpose of a piezometer is: A. Measure temperature B. Measure hydraulic head and water level C. Detect chemical composition only D. Measure rainfall Correct Answer: B. Measure hydraulic head and water level Rationale: Piezometers determine groundwater elevations to track flow directions and gradients. 29. Which type of solid waste is considered the most hazardous? A. Municipal solid waste B. Industrial non-hazardous waste C. Toxic chemical and radioactive waste D. Yard waste
Correct Answer: C. Toxic chemical and radioactive waste Rationale: Hazardous wastes can cause severe health risks and environmental damage if not properly managed.
30. Which of the following best describes “combined sewer overflow” (CSO)? A. Stormwater mixed with wastewater discharged untreated during heavy rain B. Industrial effluent only C. Leachate from landfills D. Drinking water overflow Correct Answer: A. Stormwater mixed with wastewater discharged untreated during heavy rain Rationale: CSOs occur when combined sewers exceed capacity, releasing pollutants into water bodies. 31. In an air pollution control system, a scrubber primarily removes: A. Gases and particulate matter B. Only dust C. Only VOCs D. Odors only
34. Which of the following is an example of a point source of pollution? A. Agricultural runoff B. Wastewater discharge from a factory pipe C. Urban stormwater D. Airborne dust Correct Answer: B. Wastewater discharge from a factory pipe Rationale: Point sources are identifiable, localized discharges such as pipes or outlets. 35. Which method is most suitable for removing dissolved organic matter from drinking water? A. Sedimentation B. Activated carbon adsorption C. Chlorination D. Filtration only Correct Answer: B. Activated carbon adsorption Rationale: Activated carbon effectively removes dissolved organics, taste, and odor compounds. 36. The primary mechanism of heavy metal removal in a constructed wetland is: A. Filtration only B. Plant uptake, adsorption, and sedimentation
C. UV radiation D. Chemical oxidation only Correct Answer: B. Plant uptake, adsorption, and sedimentation Rationale: Wetlands remove metals through combined physical, chemical, and biological processes.
37. Which of the following is a common environmental risk associated with hydraulic fracturing (fracking)? A. Groundwater contamination B. Increased urban green space C. Decreased industrial emissions D. Improved drinking water quality Correct Answer: A. Groundwater contamination Rationale: Fracking fluids and produced water can contaminate aquifers if not properly managed. 38. Which of the following best describes the “precautionary principle” in environmental management? A. Acting only after harm occurs B. Taking preventive action in the face of uncertainty C. Maximizing industrial output D. Relying solely on economic cost-benefit analysis Correct Answer: B. Taking preventive action in the face of uncertainty
41. Which of the following is the primary source of nitrate contamination in drinking water? A. Industrial effluents B. Agricultural fertilizers C. Municipal sewage sludge D. Natural background only Correct Answer: B. Agricultural fertilizers Rationale: Nitrate contamination commonly arises from fertilizer leaching into groundwater. 42. Which of the following is a key design parameter for an anaerobic digester? A. Hydraulic retention time (HRT) B. pH only C. Flow velocity D. Dissolved oxygen concentration Correct Answer: A. Hydraulic retention time (HRT) Rationale: HRT determines the contact time for microorganisms to degrade organic matter in anaerobic digesters. 43. Which method is most effective for removing pathogenic microorganisms from drinking water? A. Filtration only B. Chlorination or UV disinfection
C. Sedimentation only D. Coagulation Correct Answer: B. Chlorination or UV disinfection Rationale: Disinfection destroys bacteria, viruses, and protozoa, ensuring safe drinking water.
44. Which of the following is the main contributor to ozone depletion? A. Methane B. Chlorofluorocarbons (CFCs) C. Carbon dioxide D. Nitrogen oxides Correct Answer: B. Chlorofluorocarbons (CFCs) Rationale: CFCs release chlorine atoms in the stratosphere, breaking down ozone molecules. 45. Which of the following is a primary purpose of a sedimentation tank in wastewater treatment? A. Pathogen removal B. Settling of suspended solids C. Disinfection D. Nitrification
