FE Environmental Engineering Exam –
Fundamentals of Environmental Engineering,
2026 Questions with Expert Solutions &
Rationales) INSTANT DOWNLOD PDF
1. Which of the following is the primary cause of acid rain?
A. Carbon monoxide
B. Methane
C. Sulfur dioxide
D. Ozone
_Rationale:** Sulfur dioxide reacts with water in the atmosphere to
form sulfuric acid, which falls as acid rain._
2. The primary purpose of a sedimentation basin in water treatment is
to:
A. Remove dissolved ions
B. Remove suspended solids
C. Disinfect water
D. Adjust pH
_Rationale:** Sedimentation allows suspended particles to settle under
gravity, reducing turbidity before filtration._
,3. The BOD (Biochemical Oxygen Demand) test measures:
A. The concentration of dissolved oxygen in water
B. The amount of oxygen consumed by microorganisms to decompose
organic matter
C. The chemical oxidation of water pollutants
D. The total solids in water
_Rationale:** BOD indicates the organic pollution level by measuring
oxygen consumption during microbial decomposition._
4. Which of the following is considered a point source of pollution?
A. Agricultural runoff
B. Wastewater discharge from a factory
C. Urban stormwater
D. Acid rain
_Rationale:** Point sources are identifiable, discrete sources like pipes
or drains; diffuse sources like runoff are non-point sources._
5. The main function of an aeration tank in a wastewater treatment
plant is to:
A. Remove heavy metals
B. Filter solids
C. Promote microbial decomposition of organic matter
D. Neutralize pH
,_Rationale:** Aeration tanks supply oxygen to microorganisms to
biologically degrade organic pollutants._
6. What is the typical pH range of natural freshwater?
A. 3–4
B. 6.5–8.5
C. 9–10
D. 4–5
_Rationale:** Most natural waters have a pH between 6.5 and 8.5,
which is suitable for aquatic life._
7. The main purpose of chlorination in water treatment is to:
A. Remove turbidity
B. Adjust pH
C. Disinfect pathogens
D. Remove suspended solids
_Rationale:** Chlorine effectively kills or inactivates bacteria, viruses,
and other harmful microorganisms._
8. In groundwater hydrology, the zone where all pores are completely
filled with water is called:
A. Vadose zone
B. Saturated zone
, C. Capillary fringe
D. Unsaturated zone
_Rationale:** The saturated zone contains water in all pore spaces; the
vadose zone has both air and water._
9. Which gas is primarily responsible for the greenhouse effect?
A. Oxygen
B. Nitrogen
C. Carbon monoxide
D. Carbon dioxide
_Rationale:** Carbon dioxide traps infrared radiation in the
atmosphere, contributing to global warming._
10. Which of the following is a characteristic of nonpoint source
pollution?
A. Wastewater from a pipe
B. Runoff from agricultural fields
C. Discharge from a wastewater treatment plant
D. Effluent from a chemical plant
_Rationale:** Nonpoint source pollution comes from diffuse areas,
such as agricultural runoff, unlike a single identifiable point._
11. Nitrification in wastewater treatment converts:
Fundamentals of Environmental Engineering,
2026 Questions with Expert Solutions &
Rationales) INSTANT DOWNLOD PDF
1. Which of the following is the primary cause of acid rain?
A. Carbon monoxide
B. Methane
C. Sulfur dioxide
D. Ozone
_Rationale:** Sulfur dioxide reacts with water in the atmosphere to
form sulfuric acid, which falls as acid rain._
2. The primary purpose of a sedimentation basin in water treatment is
to:
A. Remove dissolved ions
B. Remove suspended solids
C. Disinfect water
D. Adjust pH
_Rationale:** Sedimentation allows suspended particles to settle under
gravity, reducing turbidity before filtration._
,3. The BOD (Biochemical Oxygen Demand) test measures:
A. The concentration of dissolved oxygen in water
B. The amount of oxygen consumed by microorganisms to decompose
organic matter
C. The chemical oxidation of water pollutants
D. The total solids in water
_Rationale:** BOD indicates the organic pollution level by measuring
oxygen consumption during microbial decomposition._
4. Which of the following is considered a point source of pollution?
A. Agricultural runoff
B. Wastewater discharge from a factory
C. Urban stormwater
D. Acid rain
_Rationale:** Point sources are identifiable, discrete sources like pipes
or drains; diffuse sources like runoff are non-point sources._
5. The main function of an aeration tank in a wastewater treatment
plant is to:
A. Remove heavy metals
B. Filter solids
C. Promote microbial decomposition of organic matter
D. Neutralize pH
,_Rationale:** Aeration tanks supply oxygen to microorganisms to
biologically degrade organic pollutants._
6. What is the typical pH range of natural freshwater?
A. 3–4
B. 6.5–8.5
C. 9–10
D. 4–5
_Rationale:** Most natural waters have a pH between 6.5 and 8.5,
which is suitable for aquatic life._
7. The main purpose of chlorination in water treatment is to:
A. Remove turbidity
B. Adjust pH
C. Disinfect pathogens
D. Remove suspended solids
_Rationale:** Chlorine effectively kills or inactivates bacteria, viruses,
and other harmful microorganisms._
8. In groundwater hydrology, the zone where all pores are completely
filled with water is called:
A. Vadose zone
B. Saturated zone
, C. Capillary fringe
D. Unsaturated zone
_Rationale:** The saturated zone contains water in all pore spaces; the
vadose zone has both air and water._
9. Which gas is primarily responsible for the greenhouse effect?
A. Oxygen
B. Nitrogen
C. Carbon monoxide
D. Carbon dioxide
_Rationale:** Carbon dioxide traps infrared radiation in the
atmosphere, contributing to global warming._
10. Which of the following is a characteristic of nonpoint source
pollution?
A. Wastewater from a pipe
B. Runoff from agricultural fields
C. Discharge from a wastewater treatment plant
D. Effluent from a chemical plant
_Rationale:** Nonpoint source pollution comes from diffuse areas,
such as agricultural runoff, unlike a single identifiable point._
11. Nitrification in wastewater treatment converts:
