Basic Operations Firefighter Certification Practice Exam

What hazard class is indicated by a green background diamond with a small canister at the top and the number 2 at the bottom?

1. Flammable liquid

2. Nonflammable gas

3. Toxic substance

4. Corrosive material

The correct answer is: Nonflammable gas

The hazard class indicated by a green background diamond with a small canister at the top and the number 2 at the bottom corresponds to the classification of a nonflammable gas. In hazardous materials communication, the diamond shape is a standardized way to quickly identify the nature of the hazard associated with the material. The green background specifically signifies the nonflammable gas category, which is important for ensuring the safety of personnel and understanding how to handle such materials. The canister symbol at the top represents the presence of gases that can be stored under pressure, while the number below signifies the specific classification within that category. In this case, the number 2 indicates the type of nonflammable gas based on its physical and chemical properties. This classification helps firefighters and first responders assess the risks involved and implement the appropriate safety measures when dealing with incidents related to nonflammable gases. Understanding these symbols and classifications is crucial for effective emergency response and hazard communication.