HSE Occupational Health and Industrial Hygiene 3 — Questions and Answers
Question 1: Under OSHA's Hazard Communication Standard (HCS), Safety Data Sheets must contain how many standardized sections?
- 16 (Correct answer)
- 12
- 8
- 20
Correct answer: 16
The GHS-aligned HCS requires 16 standardized sections on every SDS to ensure consistent hazard information worldwide.
Question 2: What is the primary purpose of conducting a job hazard analysis (JHA) before assigning a new task to workers?
- To identify hazards and determine protective measures before the task begins (Correct answer)
- To document the time needed to complete the task
- To assign personal protective equipment grades
- To satisfy workers' compensation insurance requirements
Correct answer: To identify hazards and determine protective measures before the task begins
A JHA systematically breaks down a job into steps, identifies associated hazards, and recommends controls, preventing incidents proactively.
Question 3: Which health effect is most closely associated with chronic inhalation of crystalline silica dust?
- Silicosis (Correct answer)
- Asbestosis
- Byssinosis
- Anthracosis
Correct answer: Silicosis
Silicosis is the irreversible fibrotic lung disease caused by prolonged inhalation of respirable crystalline silica particles.
Question 4: An industrial hygienist measures a TWA of 0.08 mg/m³ for respirable crystalline silica. OSHA's PEL (as a TWA) is 0.05 mg/m³. What must the employer do first?
- Implement feasible engineering and work-practice controls (Correct answer)
- Issue respirators and update the written exposure control plan
- Conduct medical surveillance immediately
- Submit an 8(d) variance request to OSHA
Correct answer: Implement feasible engineering and work-practice controls
When exposure exceeds the PEL, OSHA's silica standard requires employers to first use feasible engineering and work-practice controls before relying on respirators.
Question 5: Which parameter is measured by a direct-reading photoionization detector (PID)?
- Volatile organic compound concentration (Correct answer)
- Oxygen percentage
- Combustible gas lower explosive limit
- Particulate mass concentration
Correct answer: Volatile organic compound concentration
PIDs use UV light to ionize gas molecules and measure the resulting current, making them ideal for detecting and quantifying VOCs.
Question 6: What does the term 'half-life' mean in the context of occupational toxicology?
- The time required for half the absorbed dose of a substance to be eliminated from the body (Correct answer)
- The time a chemical remains on a surface before evaporating
- The concentration at which 50% of exposed workers show effects
- The time required to reduce airborne concentration by half
Correct answer: The time required for half the absorbed dose of a substance to be eliminated from the body
Biological half-life describes how quickly the body clears a toxicant, which determines how long a substance accumulates during repeated exposures.
Question 7: Which OSHA record-keeping form is used to record each individual work-related injury or illness case?
- OSHA 301 (Correct answer)
- OSHA 300
- OSHA 300A
- OSHA 201
Correct answer: OSHA 301
OSHA Form 301 (Injury and Illness Incident Report) captures the details of each individual case recorded on the OSHA 300 Log.
HSE Occupational Health and Industrial Hygiene 3
Under OSHA's Hazard Communication Standard (HCS), Safety Data Sheets must contain how many standardized sections?