OSHA HAZWOPER 40-Hour — All Questions
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A chemical vapor can enter the body through the lungs, be absorbed through skin, be swallowed, or be injected through a puncture. What are these four pathways collectively called?
- a.Exposure limits
- b.Routes of exposure✓
- c.Dose-response curves
- d.Physical hazards
The four routes of exposure are inhalation (lungs), absorption (skin/eyes), ingestion (swallowing), and injection (puncture). Recognizing how a contaminant can reach the body drives the choice of PPE and controls: a respirator protects against inhalation but does nothing about skin absorption, so identifying the route first is fundamental.
An atmosphere is described as IDLH. What does this designation warn a worker about?
- a.The odor is unpleasant but harmless
- b.The area is safe for short unprotected entry
- c.The condition is immediately dangerous to life or health✓
- d.The temperature exceeds comfortable limits
IDLH stands for Immediately Dangerous to Life or Health. It marks a concentration that could cause death, permanent harm, or prevent a worker from escaping without help. IDLH atmospheres call for the highest respiratory protection (such as SCBA) and are never entered with air-purifying respirators.
A worker compares a PEL and a TLV for the same substance. In general terms, what do both of these numbers describe?
- a.Airborne exposure limits meant to keep exposure below a harmful level✓
- b.The boiling point of the chemical
- c.The volume of a storage drum
- d.The number of workers allowed on site
A PEL (Permissible Exposure Limit) and a TLV (Threshold Limit Value) are both airborne concentration limits used to keep worker exposure below levels expected to cause harm, typically averaged over a work shift. PELs are OSHA regulatory limits; TLVs are consensus guidelines. Understanding that both express 'how much is too much' helps a worker interpret monitoring results.
Which of the following is best described as a physical hazard rather than a chemical, biological, or radiological hazard?
- a.A corrosive acid splash
- b.Bloodborne pathogens in waste
- c.Gamma-emitting isotopes
- d.Slippery footing and heavy machinery✓
Physical hazards include things like slips, trips, falls, noise, heat, cold, and moving equipment, distinct from chemical (corrosives), biological (pathogens), and radiological (isotopes) hazards. On a hazardous waste site all four categories can be present at once, so a good hazard assessment looks beyond chemicals and accounts for physical dangers too.