Practice question

The term LD50 in toxicology refers to the:

  1. Lowest detectable concentration by smell
  2. Dose of a substance that is lethal to 50% of a test population
  3. Legal exposure limit for 50 hours
  4. Length of decon needed in minutes

Answer: B — Dose of a substance that is lethal to 50% of a test population

The correct answer is shown above. Try the full quiz for additional practice.

Practice more: Hazmat Specialist Practice Questions - Hazardous Materials Specialist (NFPA 470) Certification Exam Exam →