1|Page
HAZWOOPER 40 FINAL EXAM AND PRACTICE
EXAM NEWEST 2025 ACTUAL EXAM 600
QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |A+ GRADED
Most hazardous waste sites contain a variety of chemical
substances in various forms. Which are included? - ANSWER-
Gas
Liquid
Solid
Substances can enter the unprotected body by: - ANSWER-
Inhalation
skin absorption
ingestion
injection
,2|Page
What do we know about symptoms resulting from chronic
exposures? - ANSWER-May not appear for several years or
decades after exposure
Usually relate to low concentrations over a long period of time
Chemical exposures are generally divided into two categories -
ANSWER-acute and chronic
To protect against the hazard of fire or explosion: - ANSWER-
Have qualified personnel field monitor for explosive
atmospheres and flammable vapors
Use non-sparking, explosion-proof equipment
Explosions and fires may arise spontaneously, but usually they
result from activities such as: - ANSWER-Accidentally mixing
chemicals
Introducing and ignition source
Moving drums
There are many potential causes of explosions and fires at
hazardous waste sites. Which of the following is a good
example? - ANSWER-Chemical reactions that produce
explosion, fire, or heat
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What do we know about oxygen? - ANSWER-Oxygen is
heavier than air
Oxygen is a strong oxidant which generates fire hazards
If oxygen is present there must be NO uncontrolled contact with
flammables
Concentrations of 19.5% or lower are deficient
Oxygen deficiency may result from - ANSWER-The
displacement of oxygen by another gas
the consumption of oxygen by a chemical reaction
What is the lowest concentration of oxygen allowed? -
ANSWER-16%
What are the three basic ways to protect yourself from radiation?
- ANSWER-Reduce time of exposure
Increase distance from exposure
Use shielding
Which radiation causes serious damage to the body? -
ANSWER-Gamma
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Background levels of radiation are - ANSWER-0.01-0.02
mrem/hr
Which radiation causes harmful burns to the skin? - ANSWER-
Beta
Protection for vertical drops: - ANSWER-Guardrails, safety net
systems, and personal fall arrest systems
It is better to use fall prevention systems than fall protection
systems because - ANSWER-Prevention systems provide more
positive safety means
What are the three important elements to prevent heat stress? -
ANSWER-Water Rest Shade
Symptoms of heat illness - ANSWER-Heat rash
fainting
heat cramps
heat exhaustion
heat stroke
HAZWOOPER 40 FINAL EXAM AND PRACTICE
EXAM NEWEST 2025 ACTUAL EXAM 600
QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |A+ GRADED
Most hazardous waste sites contain a variety of chemical
substances in various forms. Which are included? - ANSWER-
Gas
Liquid
Solid
Substances can enter the unprotected body by: - ANSWER-
Inhalation
skin absorption
ingestion
injection
,2|Page
What do we know about symptoms resulting from chronic
exposures? - ANSWER-May not appear for several years or
decades after exposure
Usually relate to low concentrations over a long period of time
Chemical exposures are generally divided into two categories -
ANSWER-acute and chronic
To protect against the hazard of fire or explosion: - ANSWER-
Have qualified personnel field monitor for explosive
atmospheres and flammable vapors
Use non-sparking, explosion-proof equipment
Explosions and fires may arise spontaneously, but usually they
result from activities such as: - ANSWER-Accidentally mixing
chemicals
Introducing and ignition source
Moving drums
There are many potential causes of explosions and fires at
hazardous waste sites. Which of the following is a good
example? - ANSWER-Chemical reactions that produce
explosion, fire, or heat
,3|Page
What do we know about oxygen? - ANSWER-Oxygen is
heavier than air
Oxygen is a strong oxidant which generates fire hazards
If oxygen is present there must be NO uncontrolled contact with
flammables
Concentrations of 19.5% or lower are deficient
Oxygen deficiency may result from - ANSWER-The
displacement of oxygen by another gas
the consumption of oxygen by a chemical reaction
What is the lowest concentration of oxygen allowed? -
ANSWER-16%
What are the three basic ways to protect yourself from radiation?
- ANSWER-Reduce time of exposure
Increase distance from exposure
Use shielding
Which radiation causes serious damage to the body? -
ANSWER-Gamma
, 4|Page
Background levels of radiation are - ANSWER-0.01-0.02
mrem/hr
Which radiation causes harmful burns to the skin? - ANSWER-
Beta
Protection for vertical drops: - ANSWER-Guardrails, safety net
systems, and personal fall arrest systems
It is better to use fall prevention systems than fall protection
systems because - ANSWER-Prevention systems provide more
positive safety means
What are the three important elements to prevent heat stress? -
ANSWER-Water Rest Shade
Symptoms of heat illness - ANSWER-Heat rash
fainting
heat cramps
heat exhaustion
heat stroke
