CHST CHST - Construction Health and Safety Technician Hazardous Materials and Chemical Safety Questions and Answers 4 — Questions and Answers
Question 1: Under OSHA's Hazard Communication Standard (HazCom 2012), how many sections are required in a Safety Data Sheet (SDS)?
- 12 sections
- 16 sections (Correct answer)
- 10 sections
- 20 sections
Correct answer: 16 sections
OSHA's HazCom 2012, aligned with GHS, mandates a standardized 16-section format for all Safety Data Sheets.
Question 2: A construction worker is exposed to isocyanate-containing spray foam. Which type of respirator provides the MINIMUM required protection during application?
- A disposable N95 filtering facepiece
- A half-face air-purifying respirator with organic vapor cartridges
- A supplied-air respirator (SAR) in positive-pressure mode (Correct answer)
- A powered air-purifying respirator (PAPR) with HEPA filters only
Correct answer: A supplied-air respirator (SAR) in positive-pressure mode
Isocyanates are highly sensitizing; OSHA and NIOSH recommend supplied-air respirators in positive-pressure mode because organic vapor cartridges may not provide adequate protection at low concentrations.
Question 3: Which NFPA 704 diamond section color indicates health hazard information?
- Red (top)
- Yellow (right)
- Blue (left) (Correct answer)
- White (bottom)
Correct answer: Blue (left)
The NFPA 704 diamond uses blue on the left quadrant to indicate health hazards, rated 0–4.
Question 4: A drum labeled with a UN/DOT hazard class 3 placard contains which category of material?
- Corrosive liquids
- Flammable liquids (Correct answer)
- Oxidizers
- Toxic gases
Correct answer: Flammable liquids
DOT Hazard Class 3 designates flammable liquids, including gasoline, acetone, and similar solvents commonly found on construction sites.
Question 5: During demolition of a pre-1980 building, workers encounter pipe insulation suspected to contain asbestos. What is the FIRST action the CHST should take?
- Immediately remove the insulation using standard PPE
- Stop work in the affected area and arrange for sampling by a licensed asbestos inspector (Correct answer)
- Wet the material and continue demolition
- Install warning tape around the area and proceed cautiously
Correct answer: Stop work in the affected area and arrange for sampling by a licensed asbestos inspector
OSHA 29 CFR 1926.1101 requires that suspect asbestos-containing materials be assessed by a competent person before disturbance; work must stop until sampling confirms or rules out ACM.
Question 6: The IDLH (Immediately Dangerous to Life or Health) value for a chemical represents:
- The concentration that causes no observable effect after 8 hours of exposure
- The maximum concentration from which an unprotected worker can escape within 30 minutes without irreversible health effects (Correct answer)
- The permissible exposure limit set by OSHA for an 8-hour workday
- The level at which a chemical becomes flammable in air
Correct answer: The maximum concentration from which an unprotected worker can escape within 30 minutes without irreversible health effects
IDLH is defined by NIOSH as the maximum concentration from which a worker could escape within 30 minutes without experiencing escape-impairing symptoms or irreversible health effects.
Question 7: Which document must employers make available to employees and their designated representatives within one working day of a request under OSHA's HazCom standard?
- The employer's written hazard communication program only
- Safety Data Sheets (SDS) for chemicals in the workplace (Correct answer)
- The chemical inventory list only
- All MSDS/SDS records for the past 5 years
Correct answer: Safety Data Sheets (SDS) for chemicals in the workplace
OSHA 29 CFR 1910.1200(g)(8) requires that SDSs be readily accessible to employees during each work shift and provided within one working day upon request.
CHST CHST - Construction Health and Safety Technician Hazardous Materials and Chemical Safety Questions and Answers 4
Under OSHA's Hazard Communication Standard (HazCom 2012), how many sections are required in a Safety Data Sheet (SDS)?