Connecticut Hazardous Materials Technician
Exam Practice Questions And Correct
Answers (Verified Answers) Plus Rationale
2027
Practice Question Bank & Answer Rationale
THIS PACK CONTAINS
150 exam-style multiple-choice questions. Each question includes the correct answer and a complete
rationale for focused revision.
COVERAGE
This exam assesses competency in hazardous materials response operations, including recognition,
identification, PPE selection, decontamination, air monitoring, incident command, and regulatory compliance
per OSHA HAZWOPER, NFPA 470, and Connecticut-specific requirements. It integrates applied chemistry,
toxicology, and tactical decision-making for technician-level responders.
STUDY GUIDE
Recommended duration: 2 hours. Passing target: 80% (40/50).
HIGHP - Page 1 of 53
,1. A technician uses a photoionization detector (PID) with a 10.6 eV lamp to monitor a spill
of an unknown organic liquid. The PID reads 0 ppm, yet the liquid has a strong odor and is
suspected to be a chlorinated solvent. Which of the following best explains this
discrepancy?
[ ] A. The PID lamp energy is too low to ionize chlorinated compounds, which typically have ionization
potentials above 10.6 eV.
[ ] B. The PID is calibrated for benzene and cannot detect any other compounds.
[ ] C. Chlorinated solvents are not volatile enough to be detected by PID.
[ ] D. The PID reading is suppressed by high humidity, which is common in Connecticut.
CORRECT: A. The PID lamp energy is too low to ionize chlorinated compounds, which typically have
ionization potentials above 10.6 eV.
Chlorinated solvents like trichloroethylene (IP 9.45 eV) and perchloroethylene (IP 8.85 eV) actually have IPs
below 10.6 eV, so they should ionize. However, many common chlorinated compounds such as methylene
chloride (IP 11.32 eV) and carbon tetrachloride (IP 11.47 eV) have IPs above 10.6 eV, making them
undetectable with a 10.6 eV lamp. This is a classic PID limitation. Options B, C, and D are incorrect because
PID response is not limited to benzene, chlorinated solvents are volatile, and humidity typically causes
positive interference, not suppression.
2. During a response to a suspected methamphetamine lab, which of the following is the
most appropriate initial action according to NFPA 470 and Connecticut law?
[ ] A. Enter with full PPE to shut down the operation and secure evidence.
[ ] B. Establish command, isolate the area, and request specialized clandestine lab resources.
[ ] C. Ventilate the structure to reduce flammable vapors before entry.
[ ] D. Use a thermal imager to locate the lab equipment and then enter with SCBA.
CORRECT: B. Establish command, isolate the area, and request specialized clandestine lab
resources.
Clandestine drug labs present unique hazards including toxic vapors, flammables, and booby traps. NFPA
470 and standard practice require isolation, establishment of command, and request for specialized teams
(e.g., DEA or state police clandestine lab units). Unauthorized entry (A, D) is extremely dangerous.
Ventilating (C) can spread contaminants and is not an initial priority.
3. A technician is selecting chemical protective clothing for a spill of 98% sulfuric acid.
Which of the following materials is most appropriate for the suit and gloves?
[ ] A. Butyl rubber
[ ] B. Natural rubber
[ ] C. Neoprene
[ ] D. Polyvinyl chloride (PVC)
HIGHP - Page 2 of 53
, CORRECT: C. Neoprene
Neoprene offers excellent resistance to concentrated sulfuric acid. Butyl rubber is not recommended for
concentrated sulfuric acid. Natural rubber and PVC have limited resistance and may degrade. Selection must
be verified with manufacturer permeation data, but neoprene is the best choice among these.
4. Which of the following best describes the purpose of the 'isolation zone' during a
hazardous materials incident?
[ ] A. The area where decontamination is performed.
[ ] B. The area immediately surrounding the release where only entry teams operate.
[ ] C. The area where support functions are performed and the public is excluded.
[ ] D. The area where the incident command post is located.
CORRECT: B. The area immediately surrounding the release where only entry teams operate.
The isolation zone (hot zone) is the area immediately surrounding the release where contamination is present
and only entry teams with appropriate PPE operate. The decontamination corridor is in the warm zone (A).
The cold zone is where support and command are located (C, D).
5. A technician is using a colorimetric gas detection tube to measure hydrogen sulfide
(H2S) in a confined space. The tube reads 15 ppm. According to NIOSH and OSHA, which
of the following is the correct interpretation?
[ ] A. The reading is below the OSHA permissible exposure limit (PEL) of 20 ppm, so it is safe for entry
without respiratory protection.
[ ] B. The reading exceeds the NIOSH recommended exposure limit (REL) of 10 ppm, so respiratory
protection is required.
[ ] C. The reading is within the acceptable range for a 15-minute short-term exposure limit (STEL) of 15
ppm.
[ ] D. The reading is below the IDLH of 100 ppm, so no action is needed.
CORRECT: B. The reading exceeds the NIOSH recommended exposure limit (REL) of 10 ppm, so
respiratory protection is required.
NIOSH REL for H2S is 10 ppm (ceiling), so 15 ppm exceeds it and requires respiratory protection. OSHA
PEL is 20 ppm as an 8-hour TWA, but the ceiling is also 20 ppm; however, NIOSH criteria are more
protective. The STEL is 15 ppm, but this is a 15-minute average, not a single reading. IDLH is 100 ppm, but
that does not mean it is safe.
6. Which of the following is the primary responsibility of the hazardous materials
technician according to NFPA 470?
[ ] A. Developing the incident action plan and approving the tactical objectives.
[ ] B. Performing offensive operations to stop the release.
[ ] C. Conducting risk assessment and determining the appropriate response objectives.
HIGHP - Page 3 of 53
, [ ] D. Implementing the planned response under the direction of the incident commander.
CORRECT: D. Implementing the planned response under the direction of the incident commander.
The hazardous materials technician implements the planned response, including entry, containment, and
decontamination, under the supervision of the incident commander. Developing the IAP (A) and determining
response objectives (C) are responsibilities of the hazardous materials incident commander. Offensive
operations (B) are performed by technicians, but the primary responsibility is implementation, not
decision-making.
7. A technician is decontaminating a responder who has been exposed to a dry powder
acid. Which of the following is the correct sequence?
[ ] A. Rinse with water, then wash with soap, then rinse again.
[ ] B. Brush off dry powder, then rinse with water, then wash with soap and water.
[ ] C. Apply a neutralizing solution, then rinse with water.
[ ] D. Wash with soap and water, then rinse with water, then brush off powder.
CORRECT: B. Brush off dry powder, then rinse with water, then wash with soap and water.
For dry powder chemicals, the first step is to brush off as much powder as possible before adding water, to
avoid activating the chemical or causing an exothermic reaction. Then rinse with copious water, then wash
with soap and water. Neutralizing solutions (C) are generally not recommended because they can cause
additional heat or toxicity. Option D is out of order.
8. Which of the following statements about the Emergency Response Guidebook (ERG)
2024 is correct?
[ ] A. The orange-bordered pages provide initial isolation and protective action distances for all
materials.
[ ] B. The yellow-bordered pages list materials by UN/NA number.
[ ] C. The green-bordered pages list materials by name.
[ ] D. The blue-bordered pages provide guidance for materials that are not listed by name.
CORRECT: B. The yellow-bordered pages list materials by UN/NA number.
The yellow-bordered pages list hazardous materials in numerical order by UN/NA identification number. The
blue-bordered pages list materials by name (C). The orange-bordered pages provide safety
recommendations and some initial isolation distances, but not for all materials (A). The green-bordered pages
provide initial isolation and protective action distances for certain materials (D is incorrect).
9. A hazardous materials technician is part of a team responding to a chlorine leak at a
water treatment plant. Which of the following is the most appropriate level of protection?
[ ] A. Level A
[ ] B. Level B
[ ] C. Level C
HIGHP - Page 4 of 53
Exam Practice Questions And Correct
Answers (Verified Answers) Plus Rationale
2027
Practice Question Bank & Answer Rationale
THIS PACK CONTAINS
150 exam-style multiple-choice questions. Each question includes the correct answer and a complete
rationale for focused revision.
COVERAGE
This exam assesses competency in hazardous materials response operations, including recognition,
identification, PPE selection, decontamination, air monitoring, incident command, and regulatory compliance
per OSHA HAZWOPER, NFPA 470, and Connecticut-specific requirements. It integrates applied chemistry,
toxicology, and tactical decision-making for technician-level responders.
STUDY GUIDE
Recommended duration: 2 hours. Passing target: 80% (40/50).
HIGHP - Page 1 of 53
,1. A technician uses a photoionization detector (PID) with a 10.6 eV lamp to monitor a spill
of an unknown organic liquid. The PID reads 0 ppm, yet the liquid has a strong odor and is
suspected to be a chlorinated solvent. Which of the following best explains this
discrepancy?
[ ] A. The PID lamp energy is too low to ionize chlorinated compounds, which typically have ionization
potentials above 10.6 eV.
[ ] B. The PID is calibrated for benzene and cannot detect any other compounds.
[ ] C. Chlorinated solvents are not volatile enough to be detected by PID.
[ ] D. The PID reading is suppressed by high humidity, which is common in Connecticut.
CORRECT: A. The PID lamp energy is too low to ionize chlorinated compounds, which typically have
ionization potentials above 10.6 eV.
Chlorinated solvents like trichloroethylene (IP 9.45 eV) and perchloroethylene (IP 8.85 eV) actually have IPs
below 10.6 eV, so they should ionize. However, many common chlorinated compounds such as methylene
chloride (IP 11.32 eV) and carbon tetrachloride (IP 11.47 eV) have IPs above 10.6 eV, making them
undetectable with a 10.6 eV lamp. This is a classic PID limitation. Options B, C, and D are incorrect because
PID response is not limited to benzene, chlorinated solvents are volatile, and humidity typically causes
positive interference, not suppression.
2. During a response to a suspected methamphetamine lab, which of the following is the
most appropriate initial action according to NFPA 470 and Connecticut law?
[ ] A. Enter with full PPE to shut down the operation and secure evidence.
[ ] B. Establish command, isolate the area, and request specialized clandestine lab resources.
[ ] C. Ventilate the structure to reduce flammable vapors before entry.
[ ] D. Use a thermal imager to locate the lab equipment and then enter with SCBA.
CORRECT: B. Establish command, isolate the area, and request specialized clandestine lab
resources.
Clandestine drug labs present unique hazards including toxic vapors, flammables, and booby traps. NFPA
470 and standard practice require isolation, establishment of command, and request for specialized teams
(e.g., DEA or state police clandestine lab units). Unauthorized entry (A, D) is extremely dangerous.
Ventilating (C) can spread contaminants and is not an initial priority.
3. A technician is selecting chemical protective clothing for a spill of 98% sulfuric acid.
Which of the following materials is most appropriate for the suit and gloves?
[ ] A. Butyl rubber
[ ] B. Natural rubber
[ ] C. Neoprene
[ ] D. Polyvinyl chloride (PVC)
HIGHP - Page 2 of 53
, CORRECT: C. Neoprene
Neoprene offers excellent resistance to concentrated sulfuric acid. Butyl rubber is not recommended for
concentrated sulfuric acid. Natural rubber and PVC have limited resistance and may degrade. Selection must
be verified with manufacturer permeation data, but neoprene is the best choice among these.
4. Which of the following best describes the purpose of the 'isolation zone' during a
hazardous materials incident?
[ ] A. The area where decontamination is performed.
[ ] B. The area immediately surrounding the release where only entry teams operate.
[ ] C. The area where support functions are performed and the public is excluded.
[ ] D. The area where the incident command post is located.
CORRECT: B. The area immediately surrounding the release where only entry teams operate.
The isolation zone (hot zone) is the area immediately surrounding the release where contamination is present
and only entry teams with appropriate PPE operate. The decontamination corridor is in the warm zone (A).
The cold zone is where support and command are located (C, D).
5. A technician is using a colorimetric gas detection tube to measure hydrogen sulfide
(H2S) in a confined space. The tube reads 15 ppm. According to NIOSH and OSHA, which
of the following is the correct interpretation?
[ ] A. The reading is below the OSHA permissible exposure limit (PEL) of 20 ppm, so it is safe for entry
without respiratory protection.
[ ] B. The reading exceeds the NIOSH recommended exposure limit (REL) of 10 ppm, so respiratory
protection is required.
[ ] C. The reading is within the acceptable range for a 15-minute short-term exposure limit (STEL) of 15
ppm.
[ ] D. The reading is below the IDLH of 100 ppm, so no action is needed.
CORRECT: B. The reading exceeds the NIOSH recommended exposure limit (REL) of 10 ppm, so
respiratory protection is required.
NIOSH REL for H2S is 10 ppm (ceiling), so 15 ppm exceeds it and requires respiratory protection. OSHA
PEL is 20 ppm as an 8-hour TWA, but the ceiling is also 20 ppm; however, NIOSH criteria are more
protective. The STEL is 15 ppm, but this is a 15-minute average, not a single reading. IDLH is 100 ppm, but
that does not mean it is safe.
6. Which of the following is the primary responsibility of the hazardous materials
technician according to NFPA 470?
[ ] A. Developing the incident action plan and approving the tactical objectives.
[ ] B. Performing offensive operations to stop the release.
[ ] C. Conducting risk assessment and determining the appropriate response objectives.
HIGHP - Page 3 of 53
, [ ] D. Implementing the planned response under the direction of the incident commander.
CORRECT: D. Implementing the planned response under the direction of the incident commander.
The hazardous materials technician implements the planned response, including entry, containment, and
decontamination, under the supervision of the incident commander. Developing the IAP (A) and determining
response objectives (C) are responsibilities of the hazardous materials incident commander. Offensive
operations (B) are performed by technicians, but the primary responsibility is implementation, not
decision-making.
7. A technician is decontaminating a responder who has been exposed to a dry powder
acid. Which of the following is the correct sequence?
[ ] A. Rinse with water, then wash with soap, then rinse again.
[ ] B. Brush off dry powder, then rinse with water, then wash with soap and water.
[ ] C. Apply a neutralizing solution, then rinse with water.
[ ] D. Wash with soap and water, then rinse with water, then brush off powder.
CORRECT: B. Brush off dry powder, then rinse with water, then wash with soap and water.
For dry powder chemicals, the first step is to brush off as much powder as possible before adding water, to
avoid activating the chemical or causing an exothermic reaction. Then rinse with copious water, then wash
with soap and water. Neutralizing solutions (C) are generally not recommended because they can cause
additional heat or toxicity. Option D is out of order.
8. Which of the following statements about the Emergency Response Guidebook (ERG)
2024 is correct?
[ ] A. The orange-bordered pages provide initial isolation and protective action distances for all
materials.
[ ] B. The yellow-bordered pages list materials by UN/NA number.
[ ] C. The green-bordered pages list materials by name.
[ ] D. The blue-bordered pages provide guidance for materials that are not listed by name.
CORRECT: B. The yellow-bordered pages list materials by UN/NA number.
The yellow-bordered pages list hazardous materials in numerical order by UN/NA identification number. The
blue-bordered pages list materials by name (C). The orange-bordered pages provide safety
recommendations and some initial isolation distances, but not for all materials (A). The green-bordered pages
provide initial isolation and protective action distances for certain materials (D is incorrect).
9. A hazardous materials technician is part of a team responding to a chlorine leak at a
water treatment plant. Which of the following is the most appropriate level of protection?
[ ] A. Level A
[ ] B. Level B
[ ] C. Level C
HIGHP - Page 4 of 53
