CHMM Health and Safety Management 5 — Questions and Answers
Question 1: A chemical with a Lethal Concentration 50 (LC50) of 5 ppm in rats is classified as:
- Extremely toxic (Correct answer)
- Slightly toxic
- Moderately toxic
- Practically non-toxic
Correct answer: Extremely toxic
An LC50 of 5 ppm (very low concentration causing death in 50% of test animals) indicates an extremely toxic substance.
Question 2: Under EPCRA Section 313, facilities must report annual releases of listed toxic chemicals via:
- Toxics Release Inventory (TRI) Form R (Correct answer)
- Tier II chemical inventory form
- RCRA Biennial Report
- NRC immediate notification
Correct answer: Toxics Release Inventory (TRI) Form R
EPCRA Section 313 requires qualifying facilities to submit annual TRI Form R reports to EPA documenting releases of listed toxic chemicals.
Question 3: During a site health and safety plan (HASP) development, the minimum level of personal protective equipment to be used at the site is based on:
- Site characterization data and known or anticipated hazards (Correct answer)
- The most recent OSHA inspection results
- What PPE is currently available in the safety supply room
- The preference of the site safety officer
Correct answer: Site characterization data and known or anticipated hazards
HASP PPE selection must be based on site characterization data and professional judgment about anticipated chemical and physical hazards.
Question 4: Noise-induced hearing loss (NIHL) is classified as which type of health effect?
- Irreversible chronic effect (Correct answer)
- Reversible acute effect
- Systemic toxicological effect
- Sensitization reaction
Correct answer: Irreversible chronic effect
NIHL results from destruction of cochlear hair cells and is permanent and irreversible, making it a chronic irreversible health effect.
Question 5: A facility performing hazardous waste site remediation must ensure all general site workers have completed how many hours of initial HAZWOPER training?
- 40 hours (Correct answer)
- 24 hours
- 8 hours
- 16 hours
Correct answer: 40 hours
29 CFR 1910.120(e)(3) requires 40 hours of off-site instruction plus 3 days of field experience for general site workers at uncontrolled hazardous waste sites.
Question 6: Which term describes the concentration of a chemical at which 50% of a test animal population dies following a single oral or dermal dose?
- LD50 (Correct answer)
- LC50
- IDLH
- NOAEL
Correct answer: LD50
LD50 (Lethal Dose 50) is the dose administered orally or dermally that kills half the test population, distinguishing it from LC50 which applies to inhaled concentrations.
Question 7: An ergonomic assessment identifies repetitive motion as a risk factor for musculoskeletal disorders (MSDs). The MOST effective primary control intervention would be:
- Redesigning the task to eliminate repetitive motions through automation or job rotation (Correct answer)
- Requiring workers to wear wrist braces during repetitive tasks
- Posting warning signs about repetitive motion hazards
- Limiting shift length to 8 hours per day
Correct answer: Redesigning the task to eliminate repetitive motions through automation or job rotation
Engineering controls like task redesign or automation eliminate the hazard at the source, making them the most effective MSD prevention strategy.
CHMM Health and Safety Management 5
A chemical with a Lethal Concentration 50 (LC50) of 5 ppm in rats is classified as: