CIH General 2 — Questions and Answers
Question 1: Which OSHA permissible exposure limit (PEL) standard applies to general industry for airborne contaminants?
- 29 CFR 1910.1000 (Correct answer)
- 29 CFR 1926.55
- 29 CFR 1910.119
- 29 CFR 1910.134
Correct answer: 29 CFR 1910.1000
29 CFR 1910.1000 establishes PELs for air contaminants in general industry workplaces.
Question 2: A hierarchy of controls lists elimination, substitution, engineering controls, administrative controls, and PPE. Which is considered MOST effective?
- Administrative controls
- Engineering controls
- Elimination (Correct answer)
- PPE
Correct answer: Elimination
Elimination physically removes the hazard at the source and is the most protective control measure.
Question 3: The ACGIH TLV-TWA represents the average airborne concentration over which time period?
- 15 minutes
- 30 minutes
- 8-hour workday (Correct answer)
- 40-hour workweek
Correct answer: 8-hour workday
The TLV-TWA is a time-weighted average concentration for a conventional 8-hour workday.
Question 4: Industrial hygiene practice follows which fundamental approach to protecting worker health?
- Anticipation, Recognition, Evaluation, Control (Correct answer)
- Identify, Assess, Mitigate, Monitor
- Survey, Sample, Analyze, Report
- Inspect, Measure, Regulate, Enforce
Correct answer: Anticipation, Recognition, Evaluation, Control
The AREC model—Anticipation, Recognition, Evaluation, and Control—is the core framework of industrial hygiene practice.
Question 5: When evaluating noise exposures, OSHA uses which exchange rate (doubling rate) in its hearing conservation standard?
- 3 dB
- 4 dB
- 5 dB (Correct answer)
- 6 dB
Correct answer: 5 dB
OSHA's noise standard uses a 5 dB exchange rate, meaning allowable exposure time halves for every 5 dB increase.
Question 6: What is the primary purpose of a Job Hazard Analysis (JHA)?
- To document worker injuries after they occur
- To identify and control hazards associated with specific job tasks (Correct answer)
- To establish production quotas for safe work
- To determine workers' compensation rates
Correct answer: To identify and control hazards associated with specific job tasks
A JHA systematically breaks down job tasks to identify and control potential hazards before injuries occur.
Question 7: Which type of ventilation dilutes contaminants by mixing contaminated air with clean air throughout a work space?
- Local exhaust ventilation
- Dilution ventilation (Correct answer)
- Recirculation ventilation
- Displacement ventilation
Correct answer: Dilution ventilation
Dilution ventilation reduces airborne contaminant concentrations by mixing large volumes of outdoor air with room air.
CIH General 2
Which OSHA permissible exposure limit (PEL) standard applies to general industry for airborne contaminants?