CHST General MCQ 4 — Questions and Answers
Question 1: What is the OSHA-defined action level for noise exposure that triggers a hearing conservation program?
- 80 dBA TWA
- 85 dBA TWA (Correct answer)
- 90 dBA TWA
- 95 dBA TWA
Correct answer: 85 dBA TWA
At 85 dBA TWA (the action level), employers must implement a hearing conservation program including audiometric testing and hearing protection availability.
Question 2: A worker is found unconscious in a permit-required confined space. What is the FIRST action rescuers should take?
- Enter the space immediately to begin CPR
- Attempt non-entry rescue using retrieval equipment (Correct answer)
- Call 911 and wait for emergency services
- Test the atmosphere inside the confined space
Correct answer: Attempt non-entry rescue using retrieval equipment
OSHA requires non-entry rescue to be attempted first using retrieval lines, wristlets, or mechanical systems to avoid endangering the rescuer in a potentially IDLH atmosphere.
Question 3: Which of the following best describes the purpose of lockout/tagout (LOTO) procedures under 29 CFR 1910.147?
- To prevent unauthorized access to construction sites
- To control hazardous energy during servicing and maintenance of equipment (Correct answer)
- To label defective tools so they are not used
- To document equipment inspection results
Correct answer: To control hazardous energy during servicing and maintenance of equipment
LOTO procedures ensure hazardous energy sources (electrical, hydraulic, pneumatic, etc.) are isolated and de-energized before workers perform servicing or maintenance.
Question 4: What is the minimum illumination level OSHA requires for general construction areas, warehouses, and corridors?
- 3 foot-candles
- 5 foot-candles (Correct answer)
- 10 foot-candles
- 30 foot-candles
Correct answer: 5 foot-candles
OSHA 29 CFR 1926.56 requires a minimum of 5 foot-candles of illumination in general construction areas, warehouses, corridors, exits, and other areas.
Question 5: When must OSHA be notified of a work-related fatality?
- Within 8 hours of learning about it (Correct answer)
- Within 24 hours of the incident
- Within 72 hours by written report
- At the next scheduled OSHA inspection
Correct answer: Within 8 hours of learning about it
Employers must report all work-related fatalities to OSHA within 8 hours of learning about the death.
Question 6: What does a yellow color-coding designation typically indicate on construction sites under ANSI/ISEA standards?
- Fire safety equipment location
- Caution or physical hazard (Correct answer)
- Radiation hazard area
- First aid equipment location
Correct answer: Caution or physical hazard
Yellow is the standard color for caution and physical hazards such as tripping, falling, or striking hazards under ANSI safety color standards.
Question 7: A safety professional calculates the incident rate for a company with 3 recordable injuries, 100 employees working 40 hrs/week for 50 weeks. What is the TRIR?
- 1.5
- 3.0 (Correct answer)
- 6.0
- 0.6
Correct answer: 3.0
TRIR = (Number of recordable injuries × 200,000) ÷ total hours worked; (3 × 200,000) ÷ (100 × 40 × 50) = 600,000 ÷ 200,000 = 3.0.
CHST General MCQ 4
What is the OSHA-defined action level for noise exposure that triggers a hearing conservation program?