CHST FREE CHST General Questions and Answers 3 — Questions and Answers
Question 1: Under OSHA's Excavation Standard (29 CFR 1926 Subpart P), what is the minimum depth that requires a protective system unless the excavation is in stable rock?
- 3 feet
- 4 feet
- 5 feet (Correct answer)
- 6 feet
Correct answer: 5 feet
OSHA requires a protective system (sloping, shoring, or shielding) for excavations 5 feet or deeper unless the excavation is entirely in stable rock.
Question 2: Which OSHA standard governs the use of personal fall arrest systems (PFAS) in construction?
- 29 CFR 1926.500
- 29 CFR 1926.502 (Correct answer)
- 29 CFR 1910.140
- 29 CFR 1926.760
Correct answer: 29 CFR 1926.502
29 CFR 1926.502 contains the fall protection systems criteria and practices, including requirements for personal fall arrest systems in construction.
Question 3: What is the maximum allowable noise exposure for an 8-hour workday under OSHA's construction noise standard?
- 85 dBA
- 90 dBA (Correct answer)
- 95 dBA
- 100 dBA
Correct answer: 90 dBA
OSHA's 29 CFR 1926.52 sets the permissible noise exposure at 90 dBA for an 8-hour time-weighted average in construction.
Question 4: A construction worker is exposed to a chemical with a flash point of 80°F (27°C). Under OSHA's flammable liquids standard, this material is classified as which class?
- Class IA
- Class IB (Correct answer)
- Class II
- Class IIIA
Correct answer: Class IB
Class IB flammable liquids have flash points below 73°F (23°C) and boiling points at or above 100°F, but a flash point of 80°F falls within Class II (between 73°F and 140°F).
Question 5: According to ANSI/ISEA 107, which class of high-visibility safety apparel provides the highest level of conspicuity and is required for workers near high-speed roadways?
- Class 1
- Class 2
- Class 3 (Correct answer)
- Class E
Correct answer: Class 3
Class 3 high-visibility apparel offers the greatest visibility and is required for workers in high-speed, complex traffic environments where full-body visibility is needed.
Question 6: When conducting a Job Hazard Analysis (JHA), which step comes FIRST in the process?
- Identify hazards associated with each step
- Determine preventive measures
- Select the job to be analyzed (Correct answer)
- Break the job into steps
Correct answer: Select the job to be analyzed
The first step in a JHA is selecting the job to be analyzed, typically prioritizing jobs with high injury rates, near-misses, or new/changed procedures.
Question 7: What does the acronym 'SDS' stand for in the context of chemical hazard communication?
- Safety Data Sheet (Correct answer)
- Standard Disclosure Statement
- Substance Danger Summary
- Structural Data Sheet
Correct answer: Safety Data Sheet
SDS stands for Safety Data Sheet, which replaced the Material Safety Data Sheet (MSDS) under OSHA's revised Hazard Communication Standard aligned with GHS.
CHST FREE CHST General Questions and Answers 3
Under OSHA's Excavation Standard (29 CFR 1926 Subpart P), what is the minimum depth that requires a protective system unless the excavation is in stable rock?