Multiple free online hazmat tests are available and the difficulty level is subjective; however, studying the chapter of the state's CDL drivers manual on hazardous material should be adequate preparation for the test, according to DMV.org. The online Hazmat practice tests help users practice before taking the real DMV exam for a CDL permit, states CDLCareerNow.com.
A Hazardous Materials Endorsement on the CDL is required for drivers of commercial vehicles and haul transporting dangerous goods including liquids, gases and solids, states TruckerCountry.com. The free online tests available usually allow users to choose between practice and exam mode. This allows them to prepare for the real test gradually. The correct answers are usually available at the end of the test.