Virginia Industrial Hygienist
Certification Exam Practice Questions
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1. What is the primary purpose of industrial hygiene?
A. To enforce legal penalties for workplace accidents
B. To anticipate, recognize, evaluate, and control workplace hazards
C. To train employees in emergency first aid
D. To design workplace productivity systems
The primary purpose of industrial hygiene is to systematically
anticipate, recognize, evaluate, and control workplace hazards to
protect worker health.
2. Which of the following best describes the concept of the hierarchy of
controls?
A. A method to calculate exposure limits
B. A prioritized approach to hazard control from most to least
effective
C. A set of administrative rules for scheduling workers
D. A framework for ergonomic job design
The hierarchy of controls ranks hazard control strategies from
elimination and substitution through engineering and administrative
controls to PPE, reflecting their effectiveness.
3. OSHA’s Permissible Exposure Limit (PEL) is best defined as:
A. A voluntary guideline provided by industrial hygienists
, B. The exposure level at which health effects are guaranteed
C. The maximum legal airborne concentration of a substance in
workplace air
D. The minimum exposure required to induce symptoms
A PEL is a legally enforceable limit on the amount or concentration of
a chemical substance in the air, intended to protect worker health.
4. Which of the following sampling media is most appropriate for
measuring respirable crystalline silica?
A. Direct-reading gas detector
B. Thermal desorption tube
C. Cyclone sampler with a filter
D. Passive badge monitor
Respirable crystalline silica sampling requires size-selective sampling
using a cyclone to collect the respirable fraction on a filter for
laboratory analysis.
5. What is the primary biological effect of benzene exposure?
A. Liver fibrosis
B. Neurotoxicity
C. Bone marrow suppression leading to anemia and leukemia
D. Renal failure
Benzene primarily affects the hematopoietic system, causing bone
marrow suppression and increasing risk for leukemia.
6. Which noise level (in dBA) is commonly cited as the action level for
hearing conservation programs?
A. 75 dBA
B. 85 dBA
C. 95 dBA
D. 100 dBA
OSHA’s hearing conservation action level is 85 dBA, at which
employers must implement a hearing conservation program.
7. What does TLV stand for as defined by ACGIH?
A. Threshold Limit Variable
B. Toxic Limit Value
C. Threshold Limit Value
D. Total Lung Volume
, TLV stands for Threshold Limit Value, which are guidelines indicating
acceptable worker exposure levels.
8. Which of the following best describes a qualitative risk assessment?
A. Uses mathematical models to quantify risk
B. Characterizes hazards and exposures using descriptive categories
C. Determines exact dose–response relationships
D. Provides numerical risk estimates for regulatory compliance
Qualitative risk assessment categorizes hazards and exposures
descriptively, without numerical quantification.
9. What is the recommended first step in conducting a workplace hazard
assessment?
A. Conduct personal sampling
B. Perform a walk-through survey
C. Implement control measures
D. Review medical records
A walk-through survey is the initial step to observe workplace
conditions and identify potential hazards.
10. Which instrument is most suitable for real-time measurement of
carbon monoxide in air?
A. Gas chromatography
B. Electrochemical sensor detector
C. NIOSH 7300 sampling tube
D. Fourier transform infrared spectrometer
Electrochemical sensors provide real-time, direct-reading
measurements of carbon monoxide levels in air.
11. What does the term “IDLH” refer to?
A. Immediate Determination of Low Hazards
B. Industrial Dose Level Hazard
C. Immediately Dangerous to Life or Health
D. Integrated Dose Limit for Health
IDLH indicates airborne concentrations that pose an immediate
threat to life or health or that cause irreversible health effects.
12. Which control method is considered the most effective for
reducing exposures?
A. Personal protective equipment
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. What is the primary purpose of industrial hygiene?
A. To enforce legal penalties for workplace accidents
B. To anticipate, recognize, evaluate, and control workplace hazards
C. To train employees in emergency first aid
D. To design workplace productivity systems
The primary purpose of industrial hygiene is to systematically
anticipate, recognize, evaluate, and control workplace hazards to
protect worker health.
2. Which of the following best describes the concept of the hierarchy of
controls?
A. A method to calculate exposure limits
B. A prioritized approach to hazard control from most to least
effective
C. A set of administrative rules for scheduling workers
D. A framework for ergonomic job design
The hierarchy of controls ranks hazard control strategies from
elimination and substitution through engineering and administrative
controls to PPE, reflecting their effectiveness.
3. OSHA’s Permissible Exposure Limit (PEL) is best defined as:
A. A voluntary guideline provided by industrial hygienists
, B. The exposure level at which health effects are guaranteed
C. The maximum legal airborne concentration of a substance in
workplace air
D. The minimum exposure required to induce symptoms
A PEL is a legally enforceable limit on the amount or concentration of
a chemical substance in the air, intended to protect worker health.
4. Which of the following sampling media is most appropriate for
measuring respirable crystalline silica?
A. Direct-reading gas detector
B. Thermal desorption tube
C. Cyclone sampler with a filter
D. Passive badge monitor
Respirable crystalline silica sampling requires size-selective sampling
using a cyclone to collect the respirable fraction on a filter for
laboratory analysis.
5. What is the primary biological effect of benzene exposure?
A. Liver fibrosis
B. Neurotoxicity
C. Bone marrow suppression leading to anemia and leukemia
D. Renal failure
Benzene primarily affects the hematopoietic system, causing bone
marrow suppression and increasing risk for leukemia.
6. Which noise level (in dBA) is commonly cited as the action level for
hearing conservation programs?
A. 75 dBA
B. 85 dBA
C. 95 dBA
D. 100 dBA
OSHA’s hearing conservation action level is 85 dBA, at which
employers must implement a hearing conservation program.
7. What does TLV stand for as defined by ACGIH?
A. Threshold Limit Variable
B. Toxic Limit Value
C. Threshold Limit Value
D. Total Lung Volume
, TLV stands for Threshold Limit Value, which are guidelines indicating
acceptable worker exposure levels.
8. Which of the following best describes a qualitative risk assessment?
A. Uses mathematical models to quantify risk
B. Characterizes hazards and exposures using descriptive categories
C. Determines exact dose–response relationships
D. Provides numerical risk estimates for regulatory compliance
Qualitative risk assessment categorizes hazards and exposures
descriptively, without numerical quantification.
9. What is the recommended first step in conducting a workplace hazard
assessment?
A. Conduct personal sampling
B. Perform a walk-through survey
C. Implement control measures
D. Review medical records
A walk-through survey is the initial step to observe workplace
conditions and identify potential hazards.
10. Which instrument is most suitable for real-time measurement of
carbon monoxide in air?
A. Gas chromatography
B. Electrochemical sensor detector
C. NIOSH 7300 sampling tube
D. Fourier transform infrared spectrometer
Electrochemical sensors provide real-time, direct-reading
measurements of carbon monoxide levels in air.
11. What does the term “IDLH” refer to?
A. Immediate Determination of Low Hazards
B. Industrial Dose Level Hazard
C. Immediately Dangerous to Life or Health
D. Integrated Dose Limit for Health
IDLH indicates airborne concentrations that pose an immediate
threat to life or health or that cause irreversible health effects.
12. Which control method is considered the most effective for
reducing exposures?
A. Personal protective equipment
