HAZWOPER 40 LESSON 3 TOXICOLOGY QUIZ QUESTIONS AND
ANSWERS | HAZWOPER 40 STUDY GUIDE & PRACTICE TEST
2026/2027
True - correct answer ✔✔Chemicals in combination can produce different biological responses than the
responses seen when exposure is to one chemical alone.
True
False
- correct answer ✔✔________ is the most common route of exposure leading to a toxic dose in the
work environment
Injection
Ingestion
Inhalation
Eye/Skin contact
A concentration of 25 mg/m3 of a substance is shown to have been fatal to 50 percent of a test group of
animals. - correct answer ✔✔LD 50 of 25 mg/m3 means that a concentration of 25 mg/m3 of a certain
substance indicates:
50 people out of a group of 80 exposed to a concentration 25 mg/m3 of a substance were shown to have
experienced a fatal dose.
50% of the concentration of a substance cause fatality in those be exposed.
A concentration of 25 mg/m3 of a substance is shown to have been fatal to 50 percent of a test group of
animals.
LD 50 is a fictitious term and does not indicate anything.
All of the above - correct answer ✔✔Factors affecting response to chemical exposure include:
Toxicity
Route of exposure
Chemical dose
All of the above
Epidemiological studies
Animal studies - correct answer ✔✔________ provide most of what we know about the dangerous
effects of toxic substances.
Epidemiological studies
Animal studies
Estimation studies
ANSWERS | HAZWOPER 40 STUDY GUIDE & PRACTICE TEST
2026/2027
True - correct answer ✔✔Chemicals in combination can produce different biological responses than the
responses seen when exposure is to one chemical alone.
True
False
- correct answer ✔✔________ is the most common route of exposure leading to a toxic dose in the
work environment
Injection
Ingestion
Inhalation
Eye/Skin contact
A concentration of 25 mg/m3 of a substance is shown to have been fatal to 50 percent of a test group of
animals. - correct answer ✔✔LD 50 of 25 mg/m3 means that a concentration of 25 mg/m3 of a certain
substance indicates:
50 people out of a group of 80 exposed to a concentration 25 mg/m3 of a substance were shown to have
experienced a fatal dose.
50% of the concentration of a substance cause fatality in those be exposed.
A concentration of 25 mg/m3 of a substance is shown to have been fatal to 50 percent of a test group of
animals.
LD 50 is a fictitious term and does not indicate anything.
All of the above - correct answer ✔✔Factors affecting response to chemical exposure include:
Toxicity
Route of exposure
Chemical dose
All of the above
Epidemiological studies
Animal studies - correct answer ✔✔________ provide most of what we know about the dangerous
effects of toxic substances.
Epidemiological studies
Animal studies
Estimation studies
