OSHA 521 OSHA Guide to Industrial
Hygiene Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. Which of the following best defines industrial hygiene?
A. The study of medical treatments for workplace injuries
B. The science of anticipating, recognizing, evaluating, and
controlling workplace hazards
C. The enforcement of OSHA citations
D. The study of productivity in the workplace
B
Industrial hygiene focuses on identifying and controlling environmental
factors that can affect workers’ health.
2. What is the primary route of entry for most chemical hazards in
the workplace?
A. Skin absorption
B. Ingestion
C. Inhalation
D. Eye contact
,C
Inhalation is the most common route for chemical exposure due to
airborne contaminants.
3. Which of the following is considered a physical hazard?
A. Benzene
B. Noise
C. Asbestos
D. Lead
B
Physical hazards include noise, temperature extremes, and radiation,
which can cause harm without chemical interaction.
4. What does the term “TLV” stand for in industrial hygiene?
A. Total Limit Value
B. Threshold Limit Value
C. Time-Limited Value
D. Toxicity Limit Verification
B
TLV is a guideline for the level of chemical substance a worker can be
exposed to without adverse health effects.
5. Which of the following is an example of an engineering control?
A. Providing respirators
B. Installing local exhaust ventilation
C. Posting warning signs
D. Conducting worker training
,B
Engineering controls reduce or eliminate exposure by modifying the
workplace rather than relying on worker behavior.
6. Which sampling method is commonly used for airborne
contaminants in occupational settings?
A. Blood testing
B. Air sampling
C. Surface wipe sampling
D. Urine testing
B
Air sampling directly measures airborne concentrations of chemicals to
assess worker exposure.
7. What is the main purpose of a Material Safety Data Sheet (MSDS)
or SDS?
A. To provide emergency procedures
B. To outline chemical hazards and protective measures
C. To list OSHA penalties
D. To track productivity
B
SDS provide detailed information on chemical properties, hazards, and
safety precautions.
8. Which of the following is an example of a biological hazard in the
workplace?
A. Lead dust
B. Heat stress
C. Bloodborne pathogens
D. Ultraviolet radiation
, C
Biological hazards include viruses, bacteria, and other microorganisms
that can cause illness.
9. What type of monitoring measures worker exposure over a full
shift?
A. Short-term exposure monitoring
B. Full-shift personal sampling
C. Instantaneous reading
D. Area sampling only
B
Full-shift monitoring captures average exposure over the duration of a
worker’s shift.
10. What is the hierarchy of controls used in industrial hygiene?
A. PPE, administrative controls, engineering controls
B. Administrative controls, PPE, engineering controls
C. Engineering controls, administrative controls, PPE
D. PPE, engineering controls, administrative controls
C
The hierarchy prioritizes removing hazards through engineering controls
first, then administrative controls, and lastly PPE.
11. Which of the following is considered an ergonomic hazard?
A. Loud noise
B. Repetitive motion
C. Solvent fumes
D. Welding sparks
Hygiene Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. Which of the following best defines industrial hygiene?
A. The study of medical treatments for workplace injuries
B. The science of anticipating, recognizing, evaluating, and
controlling workplace hazards
C. The enforcement of OSHA citations
D. The study of productivity in the workplace
B
Industrial hygiene focuses on identifying and controlling environmental
factors that can affect workers’ health.
2. What is the primary route of entry for most chemical hazards in
the workplace?
A. Skin absorption
B. Ingestion
C. Inhalation
D. Eye contact
,C
Inhalation is the most common route for chemical exposure due to
airborne contaminants.
3. Which of the following is considered a physical hazard?
A. Benzene
B. Noise
C. Asbestos
D. Lead
B
Physical hazards include noise, temperature extremes, and radiation,
which can cause harm without chemical interaction.
4. What does the term “TLV” stand for in industrial hygiene?
A. Total Limit Value
B. Threshold Limit Value
C. Time-Limited Value
D. Toxicity Limit Verification
B
TLV is a guideline for the level of chemical substance a worker can be
exposed to without adverse health effects.
5. Which of the following is an example of an engineering control?
A. Providing respirators
B. Installing local exhaust ventilation
C. Posting warning signs
D. Conducting worker training
,B
Engineering controls reduce or eliminate exposure by modifying the
workplace rather than relying on worker behavior.
6. Which sampling method is commonly used for airborne
contaminants in occupational settings?
A. Blood testing
B. Air sampling
C. Surface wipe sampling
D. Urine testing
B
Air sampling directly measures airborne concentrations of chemicals to
assess worker exposure.
7. What is the main purpose of a Material Safety Data Sheet (MSDS)
or SDS?
A. To provide emergency procedures
B. To outline chemical hazards and protective measures
C. To list OSHA penalties
D. To track productivity
B
SDS provide detailed information on chemical properties, hazards, and
safety precautions.
8. Which of the following is an example of a biological hazard in the
workplace?
A. Lead dust
B. Heat stress
C. Bloodborne pathogens
D. Ultraviolet radiation
, C
Biological hazards include viruses, bacteria, and other microorganisms
that can cause illness.
9. What type of monitoring measures worker exposure over a full
shift?
A. Short-term exposure monitoring
B. Full-shift personal sampling
C. Instantaneous reading
D. Area sampling only
B
Full-shift monitoring captures average exposure over the duration of a
worker’s shift.
10. What is the hierarchy of controls used in industrial hygiene?
A. PPE, administrative controls, engineering controls
B. Administrative controls, PPE, engineering controls
C. Engineering controls, administrative controls, PPE
D. PPE, engineering controls, administrative controls
C
The hierarchy prioritizes removing hazards through engineering controls
first, then administrative controls, and lastly PPE.
11. Which of the following is considered an ergonomic hazard?
A. Loud noise
B. Repetitive motion
C. Solvent fumes
D. Welding sparks
