PracticeVideosBlogFlashcardsEspañol
All Practice Exams

Free Practice Questions for Industrial Engineer Hazardous Materials

Exam-style questions and explanations by OpenExamPrep.

✓ No registration✓ No credit card
90+ Questions
100% Free

Loading practice questions...

Exam Review

Key Facts: Industrial Engineer Hazardous Materials Exam

60 items

Official written paper length (3 subjects × 20 items)

Q-Net Industrial Engineer grading method; Enforcement Rule [별표 8]; Q-Net 위험물산업기사 page

90 minutes

Written CBT examination duration (30 minutes per subject)

Q-Net 필기시험 접수안내 (과목당 30분)

40 / 60

Written per-subject floor (과락) and overall passing average

Q-Net 검정기준 및 방법 (산업기사)

KRW 19,400

Written registration fee on Q-Net 위험물산업기사 page

Q-Net crf005 jmCd=1769, checked 2026-09-21

KRW 20,800

Practical registration fee on Q-Net 위험물산업기사 page

Q-Net crf005 jmCd=1769, checked 2026-09-21

2 years

Written-pass exemption period from pass date

National Technical Qualifications Act Enforcement Decree Article 21

위험물산업기사 is HRD Korea's Industrial Engineer qualification under 소방청 (National Fire Agency) for hazardous materials safety managers and chemical storage supervisors. The written CBT paper consists of 60 four-option questions across three subjects (20 questions each, 90 minutes total), requiring at least 40 points per subject (과락 floor) and an overall average of 60 points. A subsequent practical examination (KRW 20,800, 필답형 written test, 2 hours) tests dangerous goods handling procedures and facility safety calculations. OpenExamPrep provides 100 independent English practice MCQs covering those written topics as a study adaptation.

Sample Industrial Engineer Hazardous Materials Practice Questions

Try these sample questions to review concepts for the Industrial Engineer Hazardous Materials exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 90+ question experience with AI tutoring.

1In the 물질의 물리·화학적 성질 subject of the 위험물산업기사 written paper, what is the ground-state electron configuration of a neutral chromium atom (Cr, atomic number Z = 24)?
A.1s2 2s2 2p6 3s2 3p6 4s2 3d4 (or [Ar] 4s2 3d4)
B.1s2 2s2 2p6 3s2 3p6 3d6 (or [Ar] 3d6)
C.1s2 2s2 2p6 3s2 3p6 4s2 3d3 4p1 (or [Ar] 4s2 3d3 4p1)
D.1s2 2s2 2p6 3s2 3p6 4s1 3d5 (or [Ar] 4s1 3d5)
Explanation: Chromium (Z=24) exhibits an anomalous electron configuration where an electron from the 4s orbital is promoted to the 3d orbital, giving [Ar] 4s1 3d5. This half-filled d-subshell (3d5) possesses enhanced exchange energy and symmetrical spherical charge distribution, conferring greater thermodynamic stability than the expected [Ar] 4s2 3d4 configuration.
2Regarding periodic trends in the periodic table (주기율표의 주기적 성질), which statement correctly explains why nitrogen (N, Z=7) has a higher first ionization energy (제1이온화에너지) than oxygen (O, Z=8)?
A.Oxygen has a smaller effective nuclear charge than nitrogen, making its valence electrons easier to remove
B.Nitrogen has a stable half-filled 2p3 subshell, whereas oxygen has paired electrons in a 2p orbital that experience inter-electronic repulsion
C.Nitrogen has a larger atomic radius than oxygen, shielding its outermost electrons from the nucleus
D.Oxygen has fewer total valence electrons than nitrogen, weakening its electrostatic attraction to the nucleus
Explanation: Nitrogen has the valence configuration 2s2 2p3, where the three 2p orbitals are each occupied by a single electron with parallel spins (half-filled subshell, maximizing exchange stabilization). Oxygen has the configuration 2s2 2p4; the pairing of two electrons in one of the 2p orbitals results in electron-electron repulsion, making it energetically easier to remove that fourth electron compared to removing an electron from nitrogen.
3In chemical bonding (화학결합), a coordinate covalent bond (배위결합) occurs when one atom donates both electrons in a shared pair. Which of the following species contains a coordinate covalent bond?
A.Methane (CH4)
B.Sodium chloride (NaCl)
C.Magnesium oxide (MgO)
D.Ammonium ion (NH4+)
Explanation: In the formation of the ammonium ion (NH4+), the neutral ammonia molecule (NH3) utilizes its lone pair on the nitrogen atom to form a bond with a hydrogen ion (H+) that contributes no electrons. This type of bond, where both shared electrons originate from a single atom, is a coordinate covalent bond (배위결합).
4Based on Valence Shell Electron Pair Repulsion (VSEPR) theory and molecular geometry (분자구조), which of the following molecules has a non-zero net dipole moment (극성 분자)?
A.Sulfur tetrafluoride (SF4)
B.Boron trifluoride (BF3)
C.Methane (CH4)
D.Carbon dioxide (CO2)
Explanation: Sulfur tetrafluoride (SF4) has 34 valence electrons, resulting in 4 bonding pairs and 1 lone pair on the central sulfur atom (AX4E steric number 5). This adopts a see-saw (시소형) geometry. Because of the asymmetrical placement of the equatorial lone pair, the individual S-F bond dipole moments do not cancel out, resulting in a polar molecule with a non-zero net dipole moment (극성 분자).
5According to the ideal gas law (이상기체 상태방정식, PV = nRT), what volume in liters does 88.0 g of carbon dioxide gas (CO2, molar mass = 44.0 g/mol) occupy at a temperature of 27 °C and a pressure of 1.50 atm? (Use gas constant R = 0.0820 L·atm/(mol·K)).
A.16.4 L
B.24.6 L
C.32.8 L
D.49.2 L
Explanation: First calculate the number of moles of CO2: n = mass / molar mass = 88.0 g / 44.0 g/mol = 2.00 mol. Convert temperature to Kelvin: T = 27 + 273.15 = 300.15 K (or 300 K). Using the ideal gas equation V = nRT / P: V = (2.00 mol × 0.0820 L·atm/(mol·K) × 300 K) / 1.50 atm = 49.2 / 1.50 = 32.8 L.
6A closed rigid vessel contains a gas mixture of 16.0 g of oxygen (O2, molar mass = 32.0 g/mol) and 28.0 g of nitrogen (N2, molar mass = 28.0 g/mol). If the total measured pressure inside the vessel is 3.00 atm, what is the partial pressure of oxygen (산소의 분압) according to Dalton's law of partial pressures (돌턴의 분압법칙)?
A.0.50 atm
B.1.00 atm
C.1.50 atm
D.2.00 atm
Explanation: Calculate the moles of each gas: n(O2) = 16.0 g / 32.0 g/mol = 0.50 mol; n(N2) = 28.0 g / 28.0 g/mol = 1.00 mol. Total moles n_total = 0.50 + 1.00 = 1.50 mol. The mole fraction of O2 is X(O2) = 0.50 / 1.50 = 1/3. By Dalton's law, P(O2) = X(O2) × P_total = (1/3) × 3.00 atm = 1.00 atm.
7Under identical temperature and pressure conditions, how many times faster does methane gas (CH4, molar mass = 16.0 g/mol) effuse through a porous pinhole compared to sulfur dioxide gas (SO2, molar mass = 64.0 g/mol), according to Graham's law of effusion (그레이엄의 확산법칙)?
A.0.5 times faster
B.1.4 times faster
C.2.0 times faster
D.4.0 times faster
Explanation: Graham's law states that the rate of effusion (r) is inversely proportional to the square root of molar mass (M): r(CH4) / r(SO2) = sqrt(M(SO2) / M(CH4)) = sqrt(64.0 / 16.0) = sqrt(4.0) = 2.0. Therefore, methane effuses 2.0 times faster than sulfur dioxide.
8Propane (C3H8, molar mass = 44.1 g/mol) undergoes complete combustion according to the equation: C3H8 + 5 O2 → 3 CO2 + 4 H2O. What mass of water (H2O, molar mass = 18.0 g/mol) is produced by the complete combustion of 44.1 g of propane with excess oxygen?
A.18.0 g
B.54.0 g
C.72.0 g
D.132.0 g
Explanation: 44.1 g of propane represents exactly 1.00 mol (44.1 g / 44.1 g/mol = 1.00 mol). From the balanced stoichiometric equation, 1 mol of propane yields 4 mol of water. Mass of water produced = 4.00 mol × 18.0 g/mol = 72.0 g.
9In laboratory preparation, how many milliliters of concentrated sulfuric acid (18.0 M H2SO4) are required to prepare 500 mL of a 0.500 M H2SO4 solution by dilution (용액의 희석)?
A.7.20 mL
B.13.9 mL
C.18.0 mL
D.27.8 mL
Explanation: Using the dilution formula M1 × V1 = M2 × V2: 18.0 M × V1 = 0.500 M × 500 mL. Solving for V1 gives V1 = (0.500 × 500) / 18.0 = 250 / 18.0 ≈ 13.89 mL (13.9 mL).
10An aqueous sodium hydroxide solution (NaOH, molar mass = 40.0 g/mol) has a concentration of 20.0 wt% (질량백분율) and a solution density of 1.20 g/mL. What is the molarity (M, mol/L) of this solution?
A.2.40 M
B.4.80 M
C.5.00 M
D.6.00 M
Explanation: Take a basis of 1.00 L (1,000 mL) of solution. The mass of 1,000 mL solution = 1,000 mL × 1.20 g/mL = 1,200 g. The mass of dissolved NaOH is 20.0% of 1,200 g = 240 g. Moles of NaOH = 240 g / 40.0 g/mol = 6.00 mol. Since this is dissolved in 1.00 L of solution, the molarity is 6.00 mol / 1.00 L = 6.00 M.

About the Industrial Engineer Hazardous Materials Exam

Industrial Engineer Hazardous Materials (위험물산업기사) is South Korea's essential national technical qualification for hazardous materials safety managers (위험물안전관리자), chemical plant safety officers, and warehouse storage supervisors. Administered by HRD Korea on Q-Net under the oversight of the National Fire Agency (소방청) and governed by the Hazardous Materials Safety Control Act (위험물안전관리법), the qualification certifies expertise across general inorganic and organic chemistry, combustion kinetics and fire extinguishing mechanics, and the physical/chemical characteristics, designated quantities (지정수량), mixed loading regulations (혼재기준), and facility containment standards for Dangerous Goods Classes 1 through 6. Following the 60-question written CBT exam, candidates must pass a 2-hour written response practical examination (필답형). The questions on this page provide an independent English-language MCQ study adaptation designed to master foundational chemistry, reaction stoichiometry, combustion physics, and dangerous goods regulations.

Exam sponsor: HRD Korea (Q-Net) / National Fire Agency (소방청). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Written CBT examination covering General Chemistry (물질의 물리·화학적 성질, 20 items), Fire Prevention and Extinguishing Methods (화재예방과 소화방법, 20 items), and Properties and Handling of Hazardous Materials (위험물 성상 및 취급, 20 items) (total 60 items, 90 minutes). Following the written exam, candidates take a 2-hour written response practical exam in Hazardous Materials Handling Practice (위험물취급 실무, 100 points). OpenExamPrep study weights cover 30 items for General Chemistry, 35 items for Fire Prevention & Extinguishing, and 35 items for Hazardous Materials Properties & Handling (100 items total).

Time Limit

90 minutes for the three written subjects (30 minutes each); 2 hours for the practical written response exam

Passing Score

Written: 40+ per subject (과락 floor) and 60 average out of 100; practical: 60/100

Exam / Certification Fees

KRW 19,400 written / KRW 20,800 practical (Q-Net, 2026-09-21)

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

33.3%

Physical and Chemical Properties of Matter (물질의 물리·화학적 성질)

Atomic structure and electron configuration, periodic trends, chemical bonding and molecular geometry, the gas laws including Dalton's and Graham's laws, stoichiometry and solution concentration, thermochemistry and Hess's law, chemical equilibrium and Kp/Kc, acid-base theory, pH and buffers, oxidation numbers and redox balancing, electrochemistry and Faraday's law, colligative properties, reaction kinetics and half-life, solubility product, and organic functional groups, isomers and aromatic nitration. Renamed from 일반화학 by the 출제기준 in force from 1 January 2025.

33.3%

Fire Prevention and Extinguishing Methods (화재예방과 소화방법)

Combustion physics (fire triangle and tetrahedron, ignition energy, flash point, autoignition, flammability limits, Le Chatelier limit calculations), static electricity generation, relaxation, and grounding, fire classifications (Class A ordinary, Class B flammable liquids, Class C electrical, Class D metals), extinguishing mechanisms (cooling, smothering, negative catalytic chain inhibition, fuel removal), and extinguishing agents (water stream/fog, chemical and mechanical foam, CO2, halocarbon replacements, dry chemical powders NaHCO3, KHCO3, NH4H2PO4) and system engineering.

33.4%

Properties and Handling of Hazardous Materials (위험물 성상 및 취급)

Hazardous Materials Safety Control Act (위험물안전관리법): Class 1 oxidizing solids (chlorates, perchlorates, nitrates, inorganic peroxides), Class 2 flammable solids (phosphorus sulfides, red phosphorus, sulfur, iron powder, metal powders, magnesium), Class 3 spontaneously combustible and water-reactive substances (potassium, sodium, alkylaluminum, calcium carbide, metallic phosphides), Class 4 flammable liquids (special flammables, 1st to 4th petroleum classes, alcohols), Class 5 self-reactive substances (organic peroxides, nitrate esters, nitro compounds), and Class 6 oxidizing liquids (perchloric acid, hydrogen peroxide, nitric acid); designated quantities (지정수량), multiple calculation (배수), mixed loading matrix (혼재기준), and facility containment standards (safety distances, dikes/retaining walls 방유제, and venting).

Preparing for the Industrial Engineer Hazardous Materials Exam

What You Need to Know

  • Passing score: Written: 40+ per subject (과락 floor) and 60 average out of 100; practical: 60/100
  • Assessment: Written CBT examination covering General Chemistry (물질의 물리·화학적 성질, 20 items), Fire Prevention and Extinguishing Methods (화재예방과 소화방법, 20 items), and Properties and Handling of Hazardous Materials (위험물 성상 및 취급, 20 items) (total 60 items, 90 minutes). Following the written exam, candidates take a 2-hour written response practical exam in Hazardous Materials Handling Practice (위험물취급 실무, 100 points). OpenExamPrep study weights cover 30 items for General Chemistry, 35 items for Fire Prevention & Extinguishing, and 35 items for Hazardous Materials Properties & Handling (100 items total).
  • Time limit: 90 minutes for the three written subjects (30 minutes each); 2 hours for the practical written response exam
  • Exam / certification fees: KRW 19,400 written / KRW 20,800 practical (Q-Net, 2026-09-21) Official sources

Using Our Practice Resources

  • Work through all 90 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

Industrial Engineer Hazardous Materials: Suggested Study Strategy

1Memorize the designated quantities (지정수량) for all six hazard classes thoroughly. Questions testing designated quantity multiples (배수 = 보유수량 / 지정수량) and mixed storage compatibility (혼재기준) appear on almost every exam.
2Master ideal gas law (PV = nRT) calculations at standard temperature and pressure (0 °C, 1 atm, 22.4 L/mol) and ambient conditions (e.g., 20 °C, 25 °C), as well as Le Chatelier's formula for flammability limits of gas mixtures.
3Pay special attention to water-reactive substances (Class 3) and their specific decomposition gases: calcium carbide (CaC2) yields acetylene (C2H2), aluminum carbide (Al4C3) yields methane (CH4), and calcium phosphide (Ca3P2) yields toxic phosphine (PH3).
4Do not neglect Physical and Chemical Properties of Matter (물질의 물리·화학적 성질); scoring below 40% (fewer than 8 out of 20 questions correct) triggers an automatic failure (과락), regardless of how high your scores are in the other two subjects.

Frequently Asked Questions

What is Industrial Engineer Hazardous Materials (위험물산업기사)?

Industrial Engineer Hazardous Materials (위험물산업기사) is a national technical qualification administered by HRD Korea (Q-Net) under the National Fire Agency (소방청). It legally qualifies holders to be appointed as Hazardous Materials Safety Managers (위험물안전관리자) under the Hazardous Materials Safety Control Act, responsible for overseeing the safe manufacturing, storage, transfer, and handling of dangerous goods in industrial plants, warehouses, laboratories, and logistics terminals across South Korea.

What is the official exam format and passing standard in 2026?

The written exam is a computer-based test (CBT) consisting of 60 four-option multiple-choice questions across three subjects: General Chemistry (20 items), Fire Prevention and Extinguishing Methods (20 items), and Properties and Handling of Hazardous Materials (20 items), with a total testing time of 90 minutes. Candidates must score at least 40 points in every subject (과락 floor) and achieve an overall average of at least 60 points out of 100. Passing the written exam qualifies candidates for the practical exam.

How is the practical examination (실기시험) structured?

The practical examination (Hazardous Materials Handling Practice, 위험물취급 실무) is a 2-hour written response test (필답형, 100 points total) conducted in a testing hall. Candidates must write out chemical reaction equations, calculate ideal gas volumes, compute designated quantity multiples (배수), evaluate mixed transport compliance, and specify facility containment dimensions (e.g. dike capacity calculations). The passing score is 60 points out of 100.

What are the official fees and written exam validity?

As verified on the Q-Net 위험물산업기사 portal on 2026-09-21, the written exam fee is KRW 19,400 and the practical exam fee is KRW 20,800. Under Article 21 of the National Technical Qualifications Act Enforcement Decree, a candidate who passes the written examination is exempt from retaking the written test for two years from the pass announcement date.

How should I use this 100-question practice bank?

This practice bank is an independent English-language study adaptation containing 100 research-grounded MCQs that reflect the exact conceptual depth, mathematical calculations, and legal standards of the official Korean exam. Standard Korean technical terms (such as designated quantities 지정수량, mixed loading standards 혼재기준, and chemical names) are included in parentheses to bridge technical English mastery with official Korean terminology.