HAZWOPER 8 Hour Refresher Test Question and
Answer [2026/2027] | UPDATED ACTUAL Exam |
Complete Exam Prep
• DOT Class 1 . CORRECT ANSWER: Explosive
• DOT Class 2 . CORRECT ANSWER: Compressed Gases ( cylinders )
• DOT Class 3 . CORRECT ANSWER: Flammable liquids (FP < 140 degrees F)
• DOT Class 4 . CORRECT ANSWER: Flammable Solids
• DOT Class 5 . CORRECT ANSWER: Oxidizers
• DOT Class 6 . CORRECT ANSWER: Poison Solids & liquids
• DOT Class 7 . CORRECT ANSWER: Radioactive
• DOT Class 8 . CORRECT ANSWER: Corrosives
• DOT Class 9 . CORRECT ANSWER: Miscellaneous
• Manufacturers Label Contains: . CORRECT ANSWER: Product name, Chemical
names, Hazards, Precautions, Storage Info, etc.
• DOT Hazard Class Labels Hazardous Materials Identification System (HMIS) .
CORRECT ANSWER: RED, BLUE, ORANGE, WHITE
• HMIS Red . CORRECT ANSWER: Flammability Rating
• HMIS Blue . CORRECT ANSWER: Health Hazard Rating
• HMIS Orange . CORRECT ANSWER: Physical Hazard Rating
• HMIS White . CORRECT ANSWER: Special Hazard Rating
• National Fire Protection Association (NFPA) Labels . CORRECT ANSWER: RED,
BLUE, YELLOW, WHITE
• NFPA Red . CORRECT ANSWER: Flammability rating
• NFPA Blue . CORRECT ANSWER: Health Hazard Rating
• NFPA Yellow . CORRECT ANSWER: Instability Hazard Rating
,• NFPA White . CORRECT ANSWER: Special Hazard Rating
• Placards Identify: . CORRECT ANSWER: The hazard class of the material and in
some cases identify the DOT identification number or UN Number
• What weight of hazardous materials requires the vehicle to display placards on all four
sides? . CORRECT ANSWER: 1000+Lbs
• Other factors, which may indicate hazardous substances . CORRECT ANSWER:
Locations, Colors, Container type or shape
• Safety Data Sheet (SDS) . CORRECT ANSWER: Information on a products
hazardous ingredients, physical properties, fire and explosion data, reactivity, health
hazard data, precautions and use. Required to be on hand for every chemical used or
stored on site.
• Shipping Papers or Manifests . CORRECT ANSWER: Reffered to as bill of landing,
are required for most hazardous material shipments. Gives information about what it is
and the hazards involved.
• Toxicology Exposure Routes . CORRECT ANSWER: Inhalation, Skin Absorption,
Ingestion, Injection
• Inhalation . CORRECT ANSWER: Contaminates into the lungs
Most critical route of entry
Direct route to the blood stream
Safe Guards: Respiratory Protection
• Absorption . CORRECT ANSWER: Upon Contact with the skin
Safe Guards: Chemical Protective Clothing
• Ingestion . CORRECT ANSWER: Exposure to contaminate through eating or drinking
Safe guards: Good Hygiene Practices. Dont eat / drink in work zones. Wash Hands and
face before eating, drinking, smoking, etc.
• Injection . CORRECT ANSWER: Direct penetration of contaminate by puncture
Safe guards: Work safely
• Categories of Exposure . CORRECT ANSWER: Acute / Chronic
• Acute . CORRECT ANSWER: Short-term exposure to high concentration of
contaminants
Results of exposure are immediate, within 72 hrs
Examples: Illness, irritation, burns, sore throat, dizziness, headache, or death.
, • Chronic . CORRECT ANSWER: Exposure to lower concentration of contaminates
over longer period of time
Symptoms: occur years after exposure
Examples: cancer, kidney damage, lung damage.
• Exposure Effects . CORRECT ANSWER: Local / Systematic
• Local Effects: . CORRECT ANSWER: damage resulting where the chemical enters
the body
• Systematic effects: . CORRECT ANSWER: damage, which seeks a specific organ
and causes damage at that point
• Mutagen: . CORRECT ANSWER: a substance capable of inducing mutations in the
DNA and in living cells
• Teratogen: . CORRECT ANSWER: causes growth abnormalities in embryos
• Carcinogen: . CORRECT ANSWER: Causes the development of cancerous growth in
living tissue
• Dose relationship . CORRECT ANSWER: Lethal Dose (LD50), Lethal Concentration
(LC50), Permissible Exposure Limit (PEL), Threshold Limit Value (TLV), Recommended
Exposure Limit (REL), Immediately Dangerous to Life or Health (IDLH)
• Lethal Dose (LD50) . CORRECT ANSWER: The concentration of a substances that is
expected to cause death of 50% of the test population when exposed to that substances
by any route other than inhalation. Oral or dermal exposure
• Lethal Concentration (LC50) . CORRECT ANSWER: The concentration of a
substance that is expected to cause death of 50% of the test population when exposed
to that substance by inhalation
• Permissible Exposure Limit (PEL) . CORRECT ANSWER: Maximum concentration of
a substance that worker can be exposed to over an 8 hour workday, 40 hour week. a list
may be found in OSHA 29 CFR 1910.1000
• Threshold limit value (TLV: TWA) . CORRECT ANSWER: Maximum Concentration of
a substance that worker can be exposed to over a 8hr work day, 40 hr week (Acetone:
500ppm)
• Threshold limit value (TLV: STEL) . CORRECT ANSWER: Maximum concentration of
a substance that a workers can be exposed over periods of time not to exceed 15 min,
4 times per day. (Acetone: 750ppm)
Answer [2026/2027] | UPDATED ACTUAL Exam |
Complete Exam Prep
• DOT Class 1 . CORRECT ANSWER: Explosive
• DOT Class 2 . CORRECT ANSWER: Compressed Gases ( cylinders )
• DOT Class 3 . CORRECT ANSWER: Flammable liquids (FP < 140 degrees F)
• DOT Class 4 . CORRECT ANSWER: Flammable Solids
• DOT Class 5 . CORRECT ANSWER: Oxidizers
• DOT Class 6 . CORRECT ANSWER: Poison Solids & liquids
• DOT Class 7 . CORRECT ANSWER: Radioactive
• DOT Class 8 . CORRECT ANSWER: Corrosives
• DOT Class 9 . CORRECT ANSWER: Miscellaneous
• Manufacturers Label Contains: . CORRECT ANSWER: Product name, Chemical
names, Hazards, Precautions, Storage Info, etc.
• DOT Hazard Class Labels Hazardous Materials Identification System (HMIS) .
CORRECT ANSWER: RED, BLUE, ORANGE, WHITE
• HMIS Red . CORRECT ANSWER: Flammability Rating
• HMIS Blue . CORRECT ANSWER: Health Hazard Rating
• HMIS Orange . CORRECT ANSWER: Physical Hazard Rating
• HMIS White . CORRECT ANSWER: Special Hazard Rating
• National Fire Protection Association (NFPA) Labels . CORRECT ANSWER: RED,
BLUE, YELLOW, WHITE
• NFPA Red . CORRECT ANSWER: Flammability rating
• NFPA Blue . CORRECT ANSWER: Health Hazard Rating
• NFPA Yellow . CORRECT ANSWER: Instability Hazard Rating
,• NFPA White . CORRECT ANSWER: Special Hazard Rating
• Placards Identify: . CORRECT ANSWER: The hazard class of the material and in
some cases identify the DOT identification number or UN Number
• What weight of hazardous materials requires the vehicle to display placards on all four
sides? . CORRECT ANSWER: 1000+Lbs
• Other factors, which may indicate hazardous substances . CORRECT ANSWER:
Locations, Colors, Container type or shape
• Safety Data Sheet (SDS) . CORRECT ANSWER: Information on a products
hazardous ingredients, physical properties, fire and explosion data, reactivity, health
hazard data, precautions and use. Required to be on hand for every chemical used or
stored on site.
• Shipping Papers or Manifests . CORRECT ANSWER: Reffered to as bill of landing,
are required for most hazardous material shipments. Gives information about what it is
and the hazards involved.
• Toxicology Exposure Routes . CORRECT ANSWER: Inhalation, Skin Absorption,
Ingestion, Injection
• Inhalation . CORRECT ANSWER: Contaminates into the lungs
Most critical route of entry
Direct route to the blood stream
Safe Guards: Respiratory Protection
• Absorption . CORRECT ANSWER: Upon Contact with the skin
Safe Guards: Chemical Protective Clothing
• Ingestion . CORRECT ANSWER: Exposure to contaminate through eating or drinking
Safe guards: Good Hygiene Practices. Dont eat / drink in work zones. Wash Hands and
face before eating, drinking, smoking, etc.
• Injection . CORRECT ANSWER: Direct penetration of contaminate by puncture
Safe guards: Work safely
• Categories of Exposure . CORRECT ANSWER: Acute / Chronic
• Acute . CORRECT ANSWER: Short-term exposure to high concentration of
contaminants
Results of exposure are immediate, within 72 hrs
Examples: Illness, irritation, burns, sore throat, dizziness, headache, or death.
, • Chronic . CORRECT ANSWER: Exposure to lower concentration of contaminates
over longer period of time
Symptoms: occur years after exposure
Examples: cancer, kidney damage, lung damage.
• Exposure Effects . CORRECT ANSWER: Local / Systematic
• Local Effects: . CORRECT ANSWER: damage resulting where the chemical enters
the body
• Systematic effects: . CORRECT ANSWER: damage, which seeks a specific organ
and causes damage at that point
• Mutagen: . CORRECT ANSWER: a substance capable of inducing mutations in the
DNA and in living cells
• Teratogen: . CORRECT ANSWER: causes growth abnormalities in embryos
• Carcinogen: . CORRECT ANSWER: Causes the development of cancerous growth in
living tissue
• Dose relationship . CORRECT ANSWER: Lethal Dose (LD50), Lethal Concentration
(LC50), Permissible Exposure Limit (PEL), Threshold Limit Value (TLV), Recommended
Exposure Limit (REL), Immediately Dangerous to Life or Health (IDLH)
• Lethal Dose (LD50) . CORRECT ANSWER: The concentration of a substances that is
expected to cause death of 50% of the test population when exposed to that substances
by any route other than inhalation. Oral or dermal exposure
• Lethal Concentration (LC50) . CORRECT ANSWER: The concentration of a
substance that is expected to cause death of 50% of the test population when exposed
to that substance by inhalation
• Permissible Exposure Limit (PEL) . CORRECT ANSWER: Maximum concentration of
a substance that worker can be exposed to over an 8 hour workday, 40 hour week. a list
may be found in OSHA 29 CFR 1910.1000
• Threshold limit value (TLV: TWA) . CORRECT ANSWER: Maximum Concentration of
a substance that worker can be exposed to over a 8hr work day, 40 hr week (Acetone:
500ppm)
• Threshold limit value (TLV: STEL) . CORRECT ANSWER: Maximum concentration of
a substance that a workers can be exposed over periods of time not to exceed 15 min,
4 times per day. (Acetone: 750ppm)
