Environmental Engineering MCQ
Environmental Engineering MCQ is a useful practice section for students, engineers, and exam aspirants who want to improve their knowledge of environmental science, pollution control, water treatment, wastewater management, air pollution, solid waste management, and sustainable engineering practices. These multiple-choice questions are designed to help learners revise important concepts quickly and prepare for semester exams, competitive exams, technical interviews, and job placement tests.
Environmental engineering focuses on protecting human health and the environment by applying engineering principles to solve problems related to water, air, soil, and waste. Regular practice of Environmental Engineering MCQs helps students understand key topics such as water quality parameters, sewage treatment, sludge treatment, BOD, COD, dissolved oxygen, air pollutants, noise pollution, environmental impact assessment, waste disposal methods, and pollution control equipment.
This MCQ section is helpful for civil engineering, chemical engineering, environmental science, and public health engineering students. It also supports aspirants preparing for GATE, PSU exams, government engineering exams, diploma exams, and technical interviews. By solving topic-wise MCQs, learners can improve accuracy, strengthen concepts, and identify weak areas before exams.
Each question is created in a simple and exam-oriented format so students can practice easily. Environmental Engineering MCQs also help learners connect theoretical knowledge with real-life environmental problems such as water contamination, air pollution, industrial waste, climate concerns, and sustainable development.
Practice Environmental Engineering MCQs regularly to improve subject understanding, boost confidence, and prepare effectively for academic and professional success.
Q1. Which process is commonly used for primary treatment of wastewater?
A. Sedimentation
B. Filtration
C. Disinfection
D. Aeration
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Q2. BOD in environmental engineering stands for:
A. Biochemical Oxygen Demand
B. Biological Oxygen Deficiency
C. Basic Oxidation Degree
D. Biological Organic Decay
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Q3. Activated sludge process is used for:
A. Tertiary treatment
B. Primary treatment
C. Secondary treatment
D. Disinfection
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Q4. Which gas is a major contributor to acid rain?
A. Carbon dioxide
B. Sulfur dioxide
C. Methane
D. Oxygen
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Q5. Which of the following is a common method of solid waste disposal?
A. Incineration
B. Osmosis
C. Electrolysis
D. Fermentation
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Q6. The main cause of eutrophication is:
A. Excess nutrients in water bodies
B. Low oxygen levels
C. High temperature
D. Microbial contamination
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Q7. What type of filtration removes microorganisms?
A. Microfiltration
B. Ultrafiltration
C. Nanofiltration
D. Reverse osmosis
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Q8. Primary source of ground water contamination is:
A. Industrial effluents
B. Rain water
C. Ocean water
D. None
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Q9. Which pollutant is mainly responsible for ozone layer depletion?
A. CO2
B. Methane
C. CFCs
D. Nitrogen oxides
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Q11. Which method is used for nitrogen removal in wastewater?
A. Nitrification-denitrification
B. Chlorination
C. Sedimentation
D. Flocculation
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Q12. Which of the following is a pathogenic indicator in water?
A. Coliform bacteria
B. Iron bacteria
C. Sulphur bacteria
D. Nitrifying bacteria
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Q13. Flocculation is:
A. Formation of colloidal particles
B. Aggregation of particles to form flocs
C. Settling of solids
D. Filtration method
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Q14. The common disinfectant used in water treatment is:
A. Chlorine
B. Hydrogen peroxide
C. Ozone
D. Mercury
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Q15. Which process reduces Biological Oxygen Demand (BOD) in water?
A. Primary sedimentation
B. Secondary biological treatment
C. Filtration
D. Coagulation
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Q16. The pH of rainwater affected by acid rain is typically:
A. 7.0
B. 5.5 or lower
C. Neutral
D. Above 8
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Q17. Heavy metals in wastewater are removed by:
A. Chemical precipitation
B. Boiling
C. Aerobic treatment
D. Sedimentation
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Q18. Anaerobic digestion in wastewater treatment produces:
A. Methane and carbon dioxide
B. Oxygen
C. Nitrogen
D. Sulfur dioxide
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Q19. Which of the following is an example of renewable energy source?
A. Coal
B. Natural gas
C. Solar energy
D. Petroleum
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Q20. Biofilters in environmental engineering are primarily used for:
A. Air pollution control
B. Water desalination
C. Noise control
D. Soil stabilization
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Q21. Which process is used to treat sewage biologically?
A. Activated sludge process
B. Distillation
C. Flocculation
D. Sedimentation
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Q22. Water hardness is caused mainly by:
A. Calcium and magnesium ions
B. Iron only
C. Chlorides
D. Sulfates
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Q23. What is the main source of suspended solids in wastewater?
A. Domestic sewage
B. Direct rainfall
C. Air pollution
D. Noise pollution
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Q24. Bioaccumulation refers to:
A. The buildup of substances in an organism over time
B. Dispersion of pollutants
C. Atmospheric deposition
D. Erosion
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Q25. The term "eutrophication" means:
A. Nutrient enrichment in water bodies causing algal blooms
B. Loss of water through evaporation
C. Decrease in water PH
D. Increase in water clarity
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Q26. Which device measures particulate matter in the air?
A. Nephelometer
B. Anemometer
C. Hygrometer
D. Barometer
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Q27. The major greenhouse gas emitted from biomass burning is:
A. Methane
B. Carbon dioxide
C. Nitrous oxide
D. Ozone
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Q28. Noise pollution is primarily measured in:
A. Decibels (dB)
B. Watts
C. Pascals
D. Volts
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Q29. Which of the following is a common water treatment method to remove pathogens?
A. Chlorination
B. Evaporation
C. Filtration
D. Sedimentation
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Q30. The term "biochemical oxygen demand" (BOD) indicates:
A. Oxygen demand by chemicals
B. Oxygen demand by microorganisms
C. Oxygen produced by plants
D. Oxygen content only
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Q31. Which of the following pollutants causes photochemical smog?
A. Ozone
B. Nitrogen oxides
C. Particulate matter
D. Sulfur dioxide
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Q32. The function of scrubbers in air pollution control is to:
A. Remove particulates and gases from exhaust air
B. Reduce noise
C. Increase oxygen
D. Filter water
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Q33. Which process describes conversion of pollutants using microorganisms?
A. Biodegradation
B. Adsorption
C. Sedimentation
D. Oxidation
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Q34. Fluoride contamination in water is treated by:
A. Activated alumina
B. Chlorination
C. Sedimentation
D. Softening
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Q35. Which pollutant is responsible for global warming besides CO2?
A. Methane
B. Oxygen
C. Hydrogen
D. Nitrogen
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Q36. Effluent treatment plants are typically used in:
A. Industries
B. Hospitals
C. Residential areas
D. Educational institutes
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Q37. Sedimentation basins are designed to:
A. Remove suspended solids by gravity
B. Improve oxygen content
C. Filter water
D. Remove dissolved gases
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Q38. The pH scale measures:
A. Acidity or alkalinity of a solution
B. Temperature
C. Density
D. Conductivity
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Q39. Anaerobic bacteria in wastewater treatment:
A. Use oxygen for respiration
B. Breakdown organic matter without oxygen
C. Increase BOD
D. Produce oxygen
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Q40. Minimum dissolved oxygen required to sustain aquatic life is approximately:
A. 2 mg/L
B. 5 mg/L
C. 10 mg/L
D. 20 mg/L
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