Certified Occupational Health Nurse
(COHN(C)) Practice Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2025|2026 Q&A | Instant
Download Pdf
1. Which federal agency is primarily responsible for enforcing workplace
safety regulations?
a. CDC
b. NIOSH
c. OSHA
d. EPA
Rationale: OSHA enforces safety standards in workplaces. NIOSH conducts
research but does not enforce.
2. The main purpose of a pre-placement health assessment is to:
a. Identify infectious diseases
,b. Match the worker’s abilities with job demands
c. Provide general health promotion
d. Screen for substance abuse
Rationale: Pre-placement assessments evaluate fitness for duty and
prevent job-worker mismatch.
3. Which law protects employees’ right to keep their health information
confidential?
a. ADA
b. HIPAA
c. OSHA Act
d. FMLA
Rationale: HIPAA ensures protection of health records and confidentiality.
4. Which vaccination is most important for healthcare workers to receive?
a. MMR
b. Varicella
c. Hepatitis B
d. Polio
Rationale: Hepatitis B poses high occupational risk to healthcare workers.
5. The “hierarchy of controls” in occupational health prioritizes which
method first?
a. PPE
b. Administrative controls
c. Engineering controls
,d. Elimination/substitution
Rationale: The most effective method is eliminating or substituting the
hazard.
6. The main purpose of OSHA’s Hazard Communication Standard is to:
a. Monitor air quality
b. Train managers
c. Ensure workers know chemical hazards
d. Regulate worker compensation
Rationale: The standard requires employers to inform workers about
chemical hazards.
7. In audiometric testing, a Standard Threshold Shift (STS) is defined as:
a. 10 dB shift at any frequency
b. 20 dB shift at 4 kHz
c. 10 dB shift averaged at 2, 3, and 4 kHz
d. 5 dB shift at 1 kHz
Rationale: OSHA defines STS as 10 dB average shift at 2, 3, and 4 kHz in
either ear.
8. A nurse suspects a worker has carpal tunnel syndrome. The first step is
to:
a. Refer to a neurologist
b. Order wrist splints
c. Conduct occupational history and ergonomic assessment
d. Start anti-inflammatory medication
, Rationale: Occupational history and ergonomic evaluation determine
work-related risk.
9. Bloodborne Pathogens Standard requires employers to:
a. Provide free TB testing
b. Mandate flu vaccination
c. Offer Hepatitis B vaccination at no cost
d. Record all minor injuries
Rationale: Employers must offer Hepatitis B vaccine to exposed workers
free of charge.
10. Which of the following is a secondary prevention activity in
occupational health?
a. Pre-placement screening
b. Hearing conservation audiometry
c. Job redesign
d. Rehabilitation
Rationale: Secondary prevention detects early disease and prevents
progression, e.g., audiometry.
11. Which act requires reasonable accommodation for employees with
disabilities?
a. FMLA
b. ADA
c. HIPAA
d. COBRA
(COHN(C)) Practice Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2025|2026 Q&A | Instant
Download Pdf
1. Which federal agency is primarily responsible for enforcing workplace
safety regulations?
a. CDC
b. NIOSH
c. OSHA
d. EPA
Rationale: OSHA enforces safety standards in workplaces. NIOSH conducts
research but does not enforce.
2. The main purpose of a pre-placement health assessment is to:
a. Identify infectious diseases
,b. Match the worker’s abilities with job demands
c. Provide general health promotion
d. Screen for substance abuse
Rationale: Pre-placement assessments evaluate fitness for duty and
prevent job-worker mismatch.
3. Which law protects employees’ right to keep their health information
confidential?
a. ADA
b. HIPAA
c. OSHA Act
d. FMLA
Rationale: HIPAA ensures protection of health records and confidentiality.
4. Which vaccination is most important for healthcare workers to receive?
a. MMR
b. Varicella
c. Hepatitis B
d. Polio
Rationale: Hepatitis B poses high occupational risk to healthcare workers.
5. The “hierarchy of controls” in occupational health prioritizes which
method first?
a. PPE
b. Administrative controls
c. Engineering controls
,d. Elimination/substitution
Rationale: The most effective method is eliminating or substituting the
hazard.
6. The main purpose of OSHA’s Hazard Communication Standard is to:
a. Monitor air quality
b. Train managers
c. Ensure workers know chemical hazards
d. Regulate worker compensation
Rationale: The standard requires employers to inform workers about
chemical hazards.
7. In audiometric testing, a Standard Threshold Shift (STS) is defined as:
a. 10 dB shift at any frequency
b. 20 dB shift at 4 kHz
c. 10 dB shift averaged at 2, 3, and 4 kHz
d. 5 dB shift at 1 kHz
Rationale: OSHA defines STS as 10 dB average shift at 2, 3, and 4 kHz in
either ear.
8. A nurse suspects a worker has carpal tunnel syndrome. The first step is
to:
a. Refer to a neurologist
b. Order wrist splints
c. Conduct occupational history and ergonomic assessment
d. Start anti-inflammatory medication
, Rationale: Occupational history and ergonomic evaluation determine
work-related risk.
9. Bloodborne Pathogens Standard requires employers to:
a. Provide free TB testing
b. Mandate flu vaccination
c. Offer Hepatitis B vaccination at no cost
d. Record all minor injuries
Rationale: Employers must offer Hepatitis B vaccine to exposed workers
free of charge.
10. Which of the following is a secondary prevention activity in
occupational health?
a. Pre-placement screening
b. Hearing conservation audiometry
c. Job redesign
d. Rehabilitation
Rationale: Secondary prevention detects early disease and prevents
progression, e.g., audiometry.
11. Which act requires reasonable accommodation for employees with
disabilities?
a. FMLA
b. ADA
c. HIPAA
d. COBRA
