HAZWOPER 40 - Lesson 3 - Toxicology
questions and answers 2024\2025 A+
Grade
Chemicals in combination can produce different biological responses than the responses seen when
exposure is to one chemical alone.
True
False
- correct answer True
________ is the most common route of exposure leading to a toxic dose in the work environment
Injection
Ingestion
Inhalation
Eye/Skin contact
- 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.
- correct answer A concentration of 25 mg/m3 of a substance is shown to have been fatal to 50 percent
of a test group of animals.
Factors affecting response to chemical exposure include:
Toxicity
Route of exposure
Chemical dose
All of the above
- correct answer All of the above
________ provide most of what we know about the dangerous effects of toxic substances.
Epidemiological studies
Animal studies
Estimation studies
Actual exposures to a chemical in the workplace
- correct answer Epidemiological studies
Animal studies
Example of chemical ________ are carbon monoxide and hydrogen cyanide.
Hepatoxins
Hematoxins
Asphyxiants
Nephrotoxins
- correct answer Asphyxiants
questions and answers 2024\2025 A+
Grade
Chemicals in combination can produce different biological responses than the responses seen when
exposure is to one chemical alone.
True
False
- correct answer True
________ is the most common route of exposure leading to a toxic dose in the work environment
Injection
Ingestion
Inhalation
Eye/Skin contact
- 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.
- correct answer A concentration of 25 mg/m3 of a substance is shown to have been fatal to 50 percent
of a test group of animals.
Factors affecting response to chemical exposure include:
Toxicity
Route of exposure
Chemical dose
All of the above
- correct answer All of the above
________ provide most of what we know about the dangerous effects of toxic substances.
Epidemiological studies
Animal studies
Estimation studies
Actual exposures to a chemical in the workplace
- correct answer Epidemiological studies
Animal studies
Example of chemical ________ are carbon monoxide and hydrogen cyanide.
Hepatoxins
Hematoxins
Asphyxiants
Nephrotoxins
- correct answer Asphyxiants
