Placards identify hazardous materials by

• A. Letters and Shapes
• B. Text and Silhouettes
• C. Colors and Numbers
• D. Symbols and Words

Answer: (C)

Placards convey hazardous material information through a color-coded system plus numeric identifiers. The color of the placard’s border quickly signals the general hazard category, helping responders recognize the type of danger at a glance. The numbers shown on the placard provide a specific identification reference that can be looked up to identify the exact material and the recommended safety actions. While symbols or text may appear, the combination of color and numbers is what allows fast, standardized recognition in the field.