CHST FREE Construction Health and Safety Technician Questions and Answers 5 — Questions and Answers
Question 1: Under OSHA 1926.502(d), when a worker is using a body harness in a personal fall arrest system, the total fall distance (including deceleration) must not exceed:
- 6 feet
- 10.5 feet
- 12 feet (Correct answer)
- 18.5 feet
Correct answer: 12 feet
The total fall distance including deceleration distance cannot exceed 12 feet under OSHA 1926.502(d).
Question 2: Which document establishes the minimum safety and health requirements for a permit-required confined space entry program?
- OSHA 29 CFR 1926.21
- OSHA 29 CFR 1910.146 (Correct answer)
- ANSI Z87.1
- NFPA 101
Correct answer: OSHA 29 CFR 1910.146
OSHA 29 CFR 1910.146 covers permit-required confined spaces and is applied to construction via 1926.21 reference.
Question 3: Which type of fire extinguisher is most appropriate for a Class D (combustible metal) fire at a construction site?
- Water (Class A)
- CO2 (Class B/C)
- Dry chemical (ABC)
- Dry sand or Met-L-X powder (Correct answer)
Correct answer: Dry sand or Met-L-X powder
Class D fires involving combustible metals like magnesium require specialized dry powder agents such as Met-L-X, not standard extinguishers.
Question 4: What is the OSHA permissible exposure limit (PEL) for silica (respirable crystalline) in construction under 29 CFR 1926.1153?
- 100 µg/m³ as an 8-hour TWA
- 50 µg/m³ as an 8-hour TWA (Correct answer)
- 250 µg/m³ as an 8-hour TWA
- 25 µg/m³ as an 8-hour TWA
Correct answer: 50 µg/m³ as an 8-hour TWA
OSHA's PEL for respirable crystalline silica in construction is 50 µg/m³ as an 8-hour time-weighted average.
Question 5: A safety technician observes workers using a powder-actuated tool without wearing hearing protection. Under OSHA standards, this tool requires hearing protection because noise levels typically exceed:
- 85 dBA
- 90 dBA (Correct answer)
- 100 dBA
- 140 dBA
Correct answer: 90 dBA
OSHA's 1926.52 action level is 90 dBA for an 8-hour TWA; powder-actuated tools often exceed this threshold.
Question 6: What is the minimum distance a spoil pile must be kept from the edge of an excavation under OSHA 1926.651?
- 2 feet (Correct answer)
- 3 feet
- 4 feet
- 5 feet
Correct answer: 2 feet
OSHA requires spoil piles to be placed at least 2 feet from the edge of an excavation to prevent cave-ins.
Question 7: During a toolbox talk on struck-by hazards, which control is considered most effective for protecting workers from swing radius hazards when a crane is operating?
- Wearing high-visibility vests
- Establishing and enforcing physical barricades around the swing radius (Correct answer)
- Conducting daily briefings with all workers
- Posting warning signs at crane access points
Correct answer: Establishing and enforcing physical barricades around the swing radius
Physical barricades prevent unauthorized entry into the swing radius, eliminating the exposure rather than relying on worker behavior.
CHST FREE Construction Health and Safety Technician Questions and Answers 5
Under OSHA 1926.502(d), when a worker is using a body harness in a personal fall arrest system, the total fall distance (including deceleration) must not exceed: