CIH General 4 — Questions and Answers
Question 1: Which OSHA standard requires employers to implement a written Hazard Communication Program?
- 29 CFR 1910.119
- 29 CFR 1910.1200 (Correct answer)
- 29 CFR 1910.134
- 29 CFR 1910.147
Correct answer: 29 CFR 1910.1200
29 CFR 1910.1200, the Hazard Communication Standard (HazCom), requires written programs, SDSs, and container labeling.
Question 2: The term 'LD50' in toxicology refers to the dose that kills what percentage of a test population?
- 5%
- 25%
- 50% (Correct answer)
- 95%
Correct answer: 50%
LD50 is the lethal dose that kills 50% of the test population and is a standard measure of acute toxicity.
Question 3: What is the primary function of a cyclone in an air sampling train for particulate matter?
- Collect total dust on a filter
- Separate respirable fraction from coarser particles (Correct answer)
- Measure particle velocity
- Generate a known particle size distribution
Correct answer: Separate respirable fraction from coarser particles
A cyclone uses centrifugal force to separate larger particles, allowing only the respirable fraction to reach the collection filter.
Question 4: Which ergonomic risk factor is associated with the highest risk of musculoskeletal disorders in warehouse workers?
- Static posture only
- Heavy forceful exertions combined with awkward postures (Correct answer)
- Moderate temperature fluctuations
- Vibration from forklifts under 5 mph
Correct answer: Heavy forceful exertions combined with awkward postures
Combining high force requirements with awkward postures greatly multiplies musculoskeletal disorder risk compared to either factor alone.
Question 5: What does the Safety Data Sheet (SDS) Section 8 specifically address?
- Physical and chemical properties
- Ecological information
- Exposure controls and personal protection (Correct answer)
- Regulatory information
Correct answer: Exposure controls and personal protection
SDS Section 8, 'Exposure Controls/Personal Protection,' lists OELs, engineering controls, and recommended PPE.
Question 6: A worker handles a chemical with a skin notation in the ACGIH TLV documentation. What does this indicate?
- The chemical causes skin cancer
- Dermal exposure can contribute significantly to overall body burden (Correct answer)
- The chemical must only be handled with gloves
- Skin irritation is the primary health concern
Correct answer: Dermal exposure can contribute significantly to overall body burden
The ACGIH skin notation indicates that cutaneous absorption can contribute to total exposure and may lead to systemic effects.
Question 7: Which type of respirator provides the highest level of respiratory protection?
- Half-face air-purifying respirator
- Full-face air-purifying respirator
- Powered air-purifying respirator
- Self-contained breathing apparatus (SCBA) (Correct answer)
Correct answer: Self-contained breathing apparatus (SCBA)
SCBAs supply clean air from a portable source and are used in IDLH atmospheres where other respirators are insufficient.
CIH General 4
Which OSHA standard requires employers to implement a written Hazard Communication Program?