Texas CDL Hazardous Materials
Endorsement (H) Practice Exam
Questions And Correct Answers
(Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. What does the Hazardous Materials (H) endorsement on a Texas
CDL authorize a driver to do?
A. Operate any commercial vehicle without restrictions
B. Transport regulated hazardous materials in commerce
C. Transport passengers for compensation
D. Operate only tank vehicles
Answer: B. Transport regulated hazardous materials in commerce
Rationale: The H endorsement is specifically associated with
transporting hazardous materials that are subject to federal
hazardous-materials transportation requirements. Other specialized
operations may require additional endorsements.
2. Which federal agency administers the security threat assessment
associated with a hazardous materials endorsement?
A. Federal Aviation Administration
B. Occupational Safety and Health Administration
C. Transportation Security Administration
D. Environmental Protection Agency
Answer: C. Transportation Security Administration
,Rationale: TSA conducts the security threat assessment for applicants
and holders of hazardous materials endorsements. The assessment is a
security requirement separate from the CDL knowledge examination.
3. What is the primary purpose of hazardous materials transportation
regulations?
A. To increase freight delivery speed
B. To protect people, property, and the environment from hazardous-
material incidents
C. To eliminate all commercial trucking
D. To reduce vehicle registration fees
Answer: B. To protect people, property, and the environment from
hazardous-material incidents
Rationale: Hazardous-materials rules establish requirements for
classification, packaging, marking, labeling, documentation, handling,
loading, transportation, and emergency response to reduce risks.
4. Which endorsement code identifies hazardous materials
transportation on a CDL?
A. N
B. P
C. H
D. T
Answer: C. H
Rationale: The H endorsement identifies hazardous materials. The N
endorsement concerns tank vehicles, P concerns passengers, and T
concerns double or triple trailers.
5. Which endorsement may be needed when transporting hazardous
materials in a qualifying tank vehicle?
,A. P only
B. N or the applicable combined X endorsement
C. S only
D. T only
Answer: B. N or the applicable combined X endorsement
Rationale: Tank vehicles generally require the N endorsement, while a
driver who needs both tank and hazardous-material authority may
qualify for the X combination endorsement.
6. What is a hazardous material?
A. Only a substance that is poisonous
B. Any cargo that is expensive
C. A material capable of posing an unreasonable risk to health, safety, or
property during transportation
D. Only gasoline
Answer: C. A material capable of posing an unreasonable risk to
health, safety, or property during transportation
Rationale: Hazardous materials include many substances presenting
physical, chemical, biological, radiological, or other transportation
hazards.
7. How many major hazard classes are used in the U.S. hazardous-
materials classification system?
A. Five
B. Seven
C. Nine
D. Twelve
Answer: C. Nine
, Rationale: Hazardous materials are organized into nine major hazard
classes, with several classes containing divisions or subdivisions.
8. Which class covers explosives?
A. Class 1
B. Class 2
C. Class 3
D. Class 4
Answer: A. Class 1
Rationale: Class 1 consists of explosives and is divided into several
divisions based on the type and degree of explosive hazard.
9. Which class covers gases?
A. Class 1
B. Class 2
C. Class 5
D. Class 8
Answer: B. Class 2
Rationale: Class 2 includes gases. Divisions include flammable gas,
nonflammable gas, and poison gas.
10. Which class covers flammable liquids?
A. Class 2
B. Class 3
C. Class 6
D. Class 8
Answer: B. Class 3
Endorsement (H) Practice Exam
Questions And Correct Answers
(Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. What does the Hazardous Materials (H) endorsement on a Texas
CDL authorize a driver to do?
A. Operate any commercial vehicle without restrictions
B. Transport regulated hazardous materials in commerce
C. Transport passengers for compensation
D. Operate only tank vehicles
Answer: B. Transport regulated hazardous materials in commerce
Rationale: The H endorsement is specifically associated with
transporting hazardous materials that are subject to federal
hazardous-materials transportation requirements. Other specialized
operations may require additional endorsements.
2. Which federal agency administers the security threat assessment
associated with a hazardous materials endorsement?
A. Federal Aviation Administration
B. Occupational Safety and Health Administration
C. Transportation Security Administration
D. Environmental Protection Agency
Answer: C. Transportation Security Administration
,Rationale: TSA conducts the security threat assessment for applicants
and holders of hazardous materials endorsements. The assessment is a
security requirement separate from the CDL knowledge examination.
3. What is the primary purpose of hazardous materials transportation
regulations?
A. To increase freight delivery speed
B. To protect people, property, and the environment from hazardous-
material incidents
C. To eliminate all commercial trucking
D. To reduce vehicle registration fees
Answer: B. To protect people, property, and the environment from
hazardous-material incidents
Rationale: Hazardous-materials rules establish requirements for
classification, packaging, marking, labeling, documentation, handling,
loading, transportation, and emergency response to reduce risks.
4. Which endorsement code identifies hazardous materials
transportation on a CDL?
A. N
B. P
C. H
D. T
Answer: C. H
Rationale: The H endorsement identifies hazardous materials. The N
endorsement concerns tank vehicles, P concerns passengers, and T
concerns double or triple trailers.
5. Which endorsement may be needed when transporting hazardous
materials in a qualifying tank vehicle?
,A. P only
B. N or the applicable combined X endorsement
C. S only
D. T only
Answer: B. N or the applicable combined X endorsement
Rationale: Tank vehicles generally require the N endorsement, while a
driver who needs both tank and hazardous-material authority may
qualify for the X combination endorsement.
6. What is a hazardous material?
A. Only a substance that is poisonous
B. Any cargo that is expensive
C. A material capable of posing an unreasonable risk to health, safety, or
property during transportation
D. Only gasoline
Answer: C. A material capable of posing an unreasonable risk to
health, safety, or property during transportation
Rationale: Hazardous materials include many substances presenting
physical, chemical, biological, radiological, or other transportation
hazards.
7. How many major hazard classes are used in the U.S. hazardous-
materials classification system?
A. Five
B. Seven
C. Nine
D. Twelve
Answer: C. Nine
, Rationale: Hazardous materials are organized into nine major hazard
classes, with several classes containing divisions or subdivisions.
8. Which class covers explosives?
A. Class 1
B. Class 2
C. Class 3
D. Class 4
Answer: A. Class 1
Rationale: Class 1 consists of explosives and is divided into several
divisions based on the type and degree of explosive hazard.
9. Which class covers gases?
A. Class 1
B. Class 2
C. Class 5
D. Class 8
Answer: B. Class 2
Rationale: Class 2 includes gases. Divisions include flammable gas,
nonflammable gas, and poison gas.
10. Which class covers flammable liquids?
A. Class 2
B. Class 3
C. Class 6
D. Class 8
Answer: B. Class 3
