North Carolina Firefighter Hazardous Materials Practice Exam

Radioactive materials are categorized under Class 7 in DOT hazard classifications. This class is set aside specifically for substances that emit ionizing radiation and require specialized packaging, labeling, handling, and transport controls. The nine DOT hazard classes group materials by their main danger so responders know what precautions to take and what placards or paperwork to expect. Other options correspond to different hazards: gases, oxidizers, flammable liquids or solids, corrosives, or toxic substances, none of which involve radioactivity.