An unknown sample would not be classified as Class 1, infectious, or radioactive material if which condition is true?

• A. It is a self-reactive substance
• B. It weighs more than 2.5 kilograms
• C. It is not considered to meet the criteria for Class 1 substances, infectious substances, or radioactive material
• D. It is an organic peroxide

Answer: (C)

Classification of dangerous goods depends on meeting specific criteria for each category. An unknown sample would not be classified as Class 1 explosives, infectious substances, or radioactive material only if it does not meet the criteria for any of those categories. If it isn’t considered to meet the criteria for Class 1, infectious substances, or radioactive material, it doesn’t belong to those three classes. The other options describe properties that may pertain to other hazard classes or are not determinative by themselves; for example, self-reactive substances and organic peroxides are handled under different classifications, and weight alone does not decide whether something qualifies for these categories. So the only condition that guarantees it isn’t in those three classes is that it does not meet their criteria.