Contractor License Practice Exam

Which of the following substances is classified as non-hazardous waste?

1. Paint

2. Cardboard

3. Asphalt

4. Concrete

The correct answer is: Cardboard

Cardboard is classified as non-hazardous waste because it is made from natural, biodegradable materials and poses no threat to human health or the environment when disposed of properly. Non-hazardous waste is typically composed of everyday materials that are not toxic or harmful. Cardboard can be recycled easily and is commonly accepted in many waste management systems. In contrast, other options like paint can contain harmful chemicals that may be toxic or flammable, thus falling under hazardous waste classifications. Asphalt, while often reused or recycled, can contain substances that may also pose environmental risks if not handled correctly. Concrete, while often considered inert, can generate dust and may contain substances that could potentially leach into the environment if not disposed of properly.