Connecticut Hazardous Materials
Emergency Response Exam Practice
Questions And Correct Answers (Verified
Answers) Plus Rationale | Instant Download
Pdf.
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 knowledge and application of hazardous materials emergency response principles based
on Connecticut and federal standards, including recognition, identification, PPE, decontamination, incident
command, and regulations. It covers the competencies required for hazardous materials technicians and
specialists under NFPA 470 and OSHA 1910.120.
STUDY GUIDE
Recommended duration: 90 minutes. Passing target: 70%.
HIGHP - Page 1 of 51
,1. A tanker truck is involved in a rollover. The placard shows UN 1005, and the ERG guide
number is 125. Which of the following actions is most appropriate for initial isolation?
[ ] A. Isolate for 150 feet in all directions and protect persons for 0.5 miles.
[ ] B. Isolate for 330 feet in all directions and protect persons for 1.0 mile.
[ ] C. Isolate for 660 feet in all directions and protect persons for 2.0 miles.
[ ] D. Isolate for 1000 feet in all directions and protect persons for 3.0 miles.
CORRECT: A. Isolate for 150 feet in all directions and protect persons for 0.5 miles.
UN 1005 is anhydrous ammonia, ERG Guide 125. For a small spill (less than 200 liters), initial isolation is
150 feet and protective action distance is 0.5 miles. Larger distances apply to large spills or different
materials.
2. Which of the following best describes the primary purpose of the 'buddy system' in
hazardous materials operations?
[ ] A. To ensure that entry teams can communicate via radio.
[ ] B. To provide a redundant safety check and rapid rescue capability.
[ ] C. To allow for faster rotation of personnel in hot zones.
[ ] D. To comply with OSHA's two-in/two-out rule for structural firefighting.
CORRECT: B. To provide a redundant safety check and rapid rescue capability.
The buddy system ensures that each entrant is constantly monitored by a partner, providing immediate
assistance and backup. It is not primarily about communication, rotation, or the two-in/two-out rule, which
applies to structural firefighting.
3. A hazardous materials technician is selecting chemical protective clothing. The material
safety data sheet indicates the substance is a chlorinated solvent. Which of the following
glove materials is most appropriate?
[ ] A. Butyl rubber
[ ] B. Natural rubber
[ ] C. Polyvinyl chloride (PVC)
[ ] D. Neoprene
CORRECT: A. Butyl rubber
Butyl rubber offers excellent resistance to chlorinated solvents. Natural rubber, PVC, and neoprene have
poor to fair resistance and may degrade.
4. During a hazardous materials incident, the incident commander establishes hot, warm,
and cold zones. Which of the following is a primary function of the warm zone?
[ ] A. It serves as the command post and staging area.
[ ] B. It is where decontamination takes place.
HIGHP - Page 2 of 51
, [ ] C. It is the area of highest contamination where entry teams work.
[ ] D. It is where the media and public are briefed.
CORRECT: B. It is where decontamination takes place.
The warm zone (contamination reduction zone) is where decontamination occurs. The hot zone is the
contaminated area, and the cold zone contains command and support functions.
5. According to OSHA 29 CFR 1910.120, which of the following is required for hazardous
materials technicians?
[ ] A. Annual refresher training of at least 8 hours.
[ ] B. Initial 24-hour HAZWOPER training.
[ ] C. Initial 40-hour HAZWOPER training and 8-hour annual refresher.
[ ] D. Initial 8-hour HAZWOPER training and 4-hour annual refresher.
CORRECT: A. Annual refresher training of at least 8 hours.
Hazardous materials technicians must complete 24 hours of initial training and 8 hours of annual refresher.
The 40-hour training is for general site workers, and 8-hour is for incidental responders.
6. A suspicious white powder is found in a mailroom. The responder's first priority should
be to:
[ ] A. Collect a sample for analysis.
[ ] B. Establish scene control and notify appropriate authorities.
[ ] C. Perform field testing with a pH strip.
[ ] D. Evacuate the entire building immediately.
CORRECT: B. Establish scene control and notify appropriate authorities.
The first priority is scene safety and control, including isolation and notification. Sampling and testing are
secondary, and evacuation may be part of establishing control but is not the first action.
7. Which of the following is the correct sequence for decontamination of a victim exposed
to a liquid corrosive?
[ ] A. Remove clothing, flush with water, wash with soap, rinse.
[ ] B. Flush with water, remove clothing, wash with soap, rinse.
[ ] C. Wash with soap, remove clothing, flush with water, rinse.
[ ] D. Remove clothing, wash with soap, flush with water, rinse.
CORRECT: A. Remove clothing, flush with water, wash with soap, rinse.
The correct sequence is to remove contaminated clothing first to prevent further exposure, then flush with
water, wash with soap, and rinse. Flushing before removal can spread contamination.
HIGHP - Page 3 of 51
, 8. A hazardous materials response team is using a combustible gas indicator (CGI) to
monitor a confined space. The meter reads 10% of the lower explosive limit (LEL). What is
the appropriate action?
[ ] A. Continue entry; the atmosphere is safe.
[ ] B. Ventilate the space and re-test before entry.
[ ] C. Evacuate immediately; the space is at explosive levels.
[ ] D. Use a different meter to confirm the reading.
CORRECT: B. Ventilate the space and re-test before entry.
Readings below 10% LEL are generally considered safe for entry, but at 10% LEL, the space should be
ventilated and re-tested. 10% LEL is not immediately dangerous but requires caution. Evacuation is
warranted at 20-25% LEL.
9. Which of the following statements about the Emergency Response Guidebook (ERG) is
correct?
[ ] A. The ERG provides specific chemical properties for all hazardous materials.
[ ] B. The ERG is intended for use by the general public.
[ ] C. The ERG assists in identifying hazards and initial isolation distances.
[ ] D. The ERG lists only materials regulated by the EPA.
CORRECT: C. The ERG assists in identifying hazards and initial isolation distances.
The ERG provides guidance for initial response actions, including isolation distances and protective actions.
It does not provide detailed chemical properties, is for emergency responders, and covers all DOT-regulated
materials.
10. A hazardous materials specialist is conducting a risk assessment at a fixed facility.
Which of the following factors is most critical in determining the potential impact of a
release?
[ ] A. The color of the container.
[ ] B. The quantity and toxicity of the material.
[ ] C. The number of employees on site.
[ ] D. The time of day.
CORRECT: B. The quantity and toxicity of the material.
The quantity and toxicity of the material are primary factors in determining the severity of a release. Container
color, employee count, and time of day are secondary considerations.
11. Under the current OSHA HAZWOPER standard, which action is required before an
employee may perform emergency response duties that involve potential exposure to
hazardous substances?
HIGHP - Page 4 of 51
Emergency Response Exam Practice
Questions And Correct Answers (Verified
Answers) Plus Rationale | Instant Download
Pdf.
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 knowledge and application of hazardous materials emergency response principles based
on Connecticut and federal standards, including recognition, identification, PPE, decontamination, incident
command, and regulations. It covers the competencies required for hazardous materials technicians and
specialists under NFPA 470 and OSHA 1910.120.
STUDY GUIDE
Recommended duration: 90 minutes. Passing target: 70%.
HIGHP - Page 1 of 51
,1. A tanker truck is involved in a rollover. The placard shows UN 1005, and the ERG guide
number is 125. Which of the following actions is most appropriate for initial isolation?
[ ] A. Isolate for 150 feet in all directions and protect persons for 0.5 miles.
[ ] B. Isolate for 330 feet in all directions and protect persons for 1.0 mile.
[ ] C. Isolate for 660 feet in all directions and protect persons for 2.0 miles.
[ ] D. Isolate for 1000 feet in all directions and protect persons for 3.0 miles.
CORRECT: A. Isolate for 150 feet in all directions and protect persons for 0.5 miles.
UN 1005 is anhydrous ammonia, ERG Guide 125. For a small spill (less than 200 liters), initial isolation is
150 feet and protective action distance is 0.5 miles. Larger distances apply to large spills or different
materials.
2. Which of the following best describes the primary purpose of the 'buddy system' in
hazardous materials operations?
[ ] A. To ensure that entry teams can communicate via radio.
[ ] B. To provide a redundant safety check and rapid rescue capability.
[ ] C. To allow for faster rotation of personnel in hot zones.
[ ] D. To comply with OSHA's two-in/two-out rule for structural firefighting.
CORRECT: B. To provide a redundant safety check and rapid rescue capability.
The buddy system ensures that each entrant is constantly monitored by a partner, providing immediate
assistance and backup. It is not primarily about communication, rotation, or the two-in/two-out rule, which
applies to structural firefighting.
3. A hazardous materials technician is selecting chemical protective clothing. The material
safety data sheet indicates the substance is a chlorinated solvent. Which of the following
glove materials is most appropriate?
[ ] A. Butyl rubber
[ ] B. Natural rubber
[ ] C. Polyvinyl chloride (PVC)
[ ] D. Neoprene
CORRECT: A. Butyl rubber
Butyl rubber offers excellent resistance to chlorinated solvents. Natural rubber, PVC, and neoprene have
poor to fair resistance and may degrade.
4. During a hazardous materials incident, the incident commander establishes hot, warm,
and cold zones. Which of the following is a primary function of the warm zone?
[ ] A. It serves as the command post and staging area.
[ ] B. It is where decontamination takes place.
HIGHP - Page 2 of 51
, [ ] C. It is the area of highest contamination where entry teams work.
[ ] D. It is where the media and public are briefed.
CORRECT: B. It is where decontamination takes place.
The warm zone (contamination reduction zone) is where decontamination occurs. The hot zone is the
contaminated area, and the cold zone contains command and support functions.
5. According to OSHA 29 CFR 1910.120, which of the following is required for hazardous
materials technicians?
[ ] A. Annual refresher training of at least 8 hours.
[ ] B. Initial 24-hour HAZWOPER training.
[ ] C. Initial 40-hour HAZWOPER training and 8-hour annual refresher.
[ ] D. Initial 8-hour HAZWOPER training and 4-hour annual refresher.
CORRECT: A. Annual refresher training of at least 8 hours.
Hazardous materials technicians must complete 24 hours of initial training and 8 hours of annual refresher.
The 40-hour training is for general site workers, and 8-hour is for incidental responders.
6. A suspicious white powder is found in a mailroom. The responder's first priority should
be to:
[ ] A. Collect a sample for analysis.
[ ] B. Establish scene control and notify appropriate authorities.
[ ] C. Perform field testing with a pH strip.
[ ] D. Evacuate the entire building immediately.
CORRECT: B. Establish scene control and notify appropriate authorities.
The first priority is scene safety and control, including isolation and notification. Sampling and testing are
secondary, and evacuation may be part of establishing control but is not the first action.
7. Which of the following is the correct sequence for decontamination of a victim exposed
to a liquid corrosive?
[ ] A. Remove clothing, flush with water, wash with soap, rinse.
[ ] B. Flush with water, remove clothing, wash with soap, rinse.
[ ] C. Wash with soap, remove clothing, flush with water, rinse.
[ ] D. Remove clothing, wash with soap, flush with water, rinse.
CORRECT: A. Remove clothing, flush with water, wash with soap, rinse.
The correct sequence is to remove contaminated clothing first to prevent further exposure, then flush with
water, wash with soap, and rinse. Flushing before removal can spread contamination.
HIGHP - Page 3 of 51
, 8. A hazardous materials response team is using a combustible gas indicator (CGI) to
monitor a confined space. The meter reads 10% of the lower explosive limit (LEL). What is
the appropriate action?
[ ] A. Continue entry; the atmosphere is safe.
[ ] B. Ventilate the space and re-test before entry.
[ ] C. Evacuate immediately; the space is at explosive levels.
[ ] D. Use a different meter to confirm the reading.
CORRECT: B. Ventilate the space and re-test before entry.
Readings below 10% LEL are generally considered safe for entry, but at 10% LEL, the space should be
ventilated and re-tested. 10% LEL is not immediately dangerous but requires caution. Evacuation is
warranted at 20-25% LEL.
9. Which of the following statements about the Emergency Response Guidebook (ERG) is
correct?
[ ] A. The ERG provides specific chemical properties for all hazardous materials.
[ ] B. The ERG is intended for use by the general public.
[ ] C. The ERG assists in identifying hazards and initial isolation distances.
[ ] D. The ERG lists only materials regulated by the EPA.
CORRECT: C. The ERG assists in identifying hazards and initial isolation distances.
The ERG provides guidance for initial response actions, including isolation distances and protective actions.
It does not provide detailed chemical properties, is for emergency responders, and covers all DOT-regulated
materials.
10. A hazardous materials specialist is conducting a risk assessment at a fixed facility.
Which of the following factors is most critical in determining the potential impact of a
release?
[ ] A. The color of the container.
[ ] B. The quantity and toxicity of the material.
[ ] C. The number of employees on site.
[ ] D. The time of day.
CORRECT: B. The quantity and toxicity of the material.
The quantity and toxicity of the material are primary factors in determining the severity of a release. Container
color, employee count, and time of day are secondary considerations.
11. Under the current OSHA HAZWOPER standard, which action is required before an
employee may perform emergency response duties that involve potential exposure to
hazardous substances?
HIGHP - Page 4 of 51
