Forms A–B · First edition

FE Environmental Practice Exam

110 original four-choice problems mapped to the current FE Environmental knowledge areas, with complete worked solutions.

See 2 forms — USD 29 each Free practice PDF · 15 problems Read free problems

Water and wastewater, hydraulics, surface water hydrology, and groundwater account for 46 of the 110 problems here, and no area outside water reaches ten problems.

Problems: 110 per form
Free problems: 15
Forms: 2

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Practice Exam, Form A

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110 original problems and complete worked solutions
Answer key and knowledge-area score sheet
131-page immediate private PDF download

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Practice Exam, Form B

USD29

110 original problems and complete worked solutions
Answer key and knowledge-area score sheet
100-page immediate private PDF download

14-day full refund · 90-day download access

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Direct renders from the current PDF releases, not illustrative mockups.

Form A

131 pages · Version 1.0.0

FE Environmental Form A: A worked-solution page from the current release — **Worked solution**Form A · direct PDF render

FE Environmental Form A: The knowledge-area score sheet included in the PDF — **Score sheet**Form A · direct PDF render

Form B

100 pages · Version 1.0.0

FE Environmental Form B: A worked-solution page from the current release — **Worked solution**Form B · direct PDF render

FE Environmental Form B: The knowledge-area score sheet included in the PDF — **Score sheet**Form B · direct PDF render

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Try a complete mathematics problem

A completely mixed lagoon of volume $500 m^{3}$ initially holds a contaminant at $40 mg/L$ . Contaminant-free water enters at $25 m^{3} / h$ and the lagoon discharges at the same rate. Within the lagoon the contaminant also decays by a first-order reaction with $k = 0.030 h^{- 1}$ . The contaminant concentration after 30 h is most nearly:

(A)3.6 mg/L
(B)8.9 mg/L
(C)16.3 mg/L
(D)22.0 mg/L

Show worked solution

Answer: (A)

Washout and reaction combine into a single first-order coefficient of $0.080 h^{- 1}$ , leaving about 3.6 mg/L after 30 h.

Washout and reaction both remove mass in proportion to the instantaneous concentration, so the unsteady mass balance collapses to one lumped rate constant.

V \frac{d C}{d t} = - QC - k V C

\frac{d C}{d t} = - (\frac{Q}{V} + k) C

Hydraulic washout at $Q / V$ and reaction at $k$ are additive because both are first order in $C$ .

\frac{Q}{V} + k = \frac{25}{500} + 0.030 = 0.080 h^{- 1}

Exponential decay from the initial 40 mg/L over 30 h leaves

C = 40 e^{- (0.080) (30)} = 40 (0.0907) = 3.6 mg/L

FE Reference Handbook — Mathematics: Differential Equations, First-Order Linear Homogeneous with Constant Coefficients

Why the other choices appear

(B)Neglects the reaction and uses washout alone: $40 e^{- (0.050) (30)} = 8.9$ mg/L.
(C)Neglects washout and uses the decay constant alone: $40 e^{- (0.030) (30)} = 16.3$ mg/L.
(D)Subtracts the decay rate from the washout rate instead of adding: $40 e^{- (0.020) (30)} = 22.0$ mg/L.

What each download contains

Edition: First edition
Form A: 131 pages · Version 1.0.0
Form B: 100 pages · Version 1.0.0
Questions: 110 original problems per form
Coverage: 15 knowledge areas
Question type: Four-choice, single-answer
Format: Print-ready PDF, US Letter

Built against the NCEES FE Environmental specifications effective July 2020, current as of July 2026. Official exam format and appointment facts are available from NCEES. This printable form does not reproduce the Pearson VUE interface or interactive alternative item types.

Knowledge-area coverage

Knowledge area	Form A	NCEES range
Mathematics	6	5-8
Probability and Statistics	4	4-6
Ethics and Professional Practice	5	5-8
Engineering Economics	5	5-8
Fundamental Principles	8	7-11
Environmental Chemistry	8	7-11
Health Hazards and Risk Assessment	5	4-6
Fluid Mechanics and Hydraulics	13	12-18
Thermodynamics	3	3-5
Surface Water Resources and Hydrology	10	9-14
Groundwater, Soils, and Sediments	9	8-12
Water and Wastewater	14	12-18
Air Quality and Control	9	8-12
Solid and Hazardous Waste	7	7-11
Energy and Environment	4	4-6

Verification and corrections

Original problems, checked by a second calculation route

Every answer is reproduced with an alternate formula, a limiting case, a dimensional check, or a direct recomputation before publication. Official examination questions are confidential and are not reproduced or paraphrased.

Confirmed errors are published as versioned corrections. Buyers can re-download the corrected release at no charge. Read the full editorial method.

For a repeat attempt

Close the weak areas before another USD 225 appointment

FE Environmental repeat examinees passed at 37% versus 67% for first-time examinees in the cited NCEES data. Use the form's score sheet beside your diagnostic report, then read the FE Environmental retake plan or compare FE pass rates by discipline.

Before you buy

Questions about the PDF

Is this an official NCEES practice exam?

EngineerProof is not affiliated with, endorsed by, or sponsored by NCEES. FE and NCEES are registered trademarks of the National Council of Examiners for Engineering and Surveying, used solely to identify the examination for which these study materials are relevant. All problems and solutions in this publication are original works.

Does it reproduce the computer-based test interface?

No. This is a printable four-choice PDF. It does not include the Pearson VUE interface or interactive alternative item types such as point-and-click and drag-and-drop.

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