CHMM Occupational Health And Safety 5 — Questions and Answers
Question 1: During a chemical emergency response, an incident commander notices a greenish-yellow vapor cloud. Which chemical is MOST likely responsible?
- Ammonia
- Hydrogen sulfide
- Chlorine gas (Correct answer)
- Carbon monoxide
Correct answer: Chlorine gas
Chlorine gas has a distinctive greenish-yellow color and a sharp, bleach-like odor, making visual identification possible during releases.
Question 2: Which route of chemical exposure is responsible for the MAJORITY of occupational illness cases involving volatile organic compounds (VOCs)?
- Ingestion
- Dermal contact
- Inhalation (Correct answer)
- Injection
Correct answer: Inhalation
Inhalation is the primary route of exposure for VOCs in occupational settings because volatile chemicals readily become airborne and are inhaled during breathing.
Question 3: What is the purpose of biological monitoring in an occupational health program?
- To measure ambient air concentrations of hazardous substances near workers
- To measure the actual internal dose of a toxicant or its metabolites in workers' blood, urine, or exhaled air (Correct answer)
- To determine surface contamination levels on work equipment
- To assess the effectiveness of engineering controls at the source
Correct answer: To measure the actual internal dose of a toxicant or its metabolites in workers' blood, urine, or exhaled air
Biological monitoring measures internal body burden via biomarkers in biological specimens, reflecting actual absorbed dose from all exposure routes combined.
Question 4: Under OSHA's noise standard (29 CFR 1910.95), at what 8-hour TWA noise level must employers implement a hearing conservation program?
- 80 dBA
- 85 dBA (Correct answer)
- 90 dBA
- 95 dBA
Correct answer: 85 dBA
An action level of 85 dBA (8-hr TWA) triggers the hearing conservation program, including monitoring, audiometric testing, training, and hearing protector provision.
Question 5: Which of the following best describes the difference between acute and chronic toxicity?
- Acute effects occur only in children; chronic effects occur only in adults
- Acute toxicity results from a single or short-term exposure; chronic toxicity results from repeated long-term exposure (Correct answer)
- Acute toxicity always causes immediate death; chronic toxicity causes delayed death only
- Acute and chronic toxicity are the same concept measured at different dose levels
Correct answer: Acute toxicity results from a single or short-term exposure; chronic toxicity results from repeated long-term exposure
Acute toxicity involves harmful effects from a single or short-term high-dose exposure, while chronic toxicity involves effects from repeated or continuous lower-dose exposures over time.
Question 6: When two chemicals together produce a combined effect greater than the sum of their individual effects, this interaction is called:
- Additive toxicity
- Antagonistic toxicity
- Potentiation
- Synergistic toxicity (Correct answer)
Correct answer: Synergistic toxicity
Synergistic toxicity occurs when combined exposure produces an effect greater than the arithmetic sum (1+1>2), such as asbestos and cigarette smoking multiplicatively increasing lung cancer risk.
Question 7: What is the minimum required initial HAZWOPER training for workers at uncontrolled hazardous waste cleanup sites who may be exposed to hazardous substances?
- 8 hours
- 24 hours
- 40 hours (Correct answer)
- 16 hours
Correct answer: 40 hours
OSHA 29 CFR 1910.120(e) requires 40 hours of initial off-site training plus 3 days of supervised field experience for general site workers at uncontrolled hazardous waste sites.
CHMM Occupational Health And Safety 5
During a chemical emergency response, an incident commander notices a greenish-yellow vapor cloud.
Which chemical is MOST likely responsible?