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FMCSA Commercial Driver's License - Reviews


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See why our users from 154 countries love us for their exam prep! Including 110 reviews for the FMCSA CDL exam.

Exam Edge is an industry leader in online test prep. We work with institutional partners to offer a wide array of practice tests that will help you prepare for your big exam. No matter how niche your field of interest might be, we're here to help you prepare for test day.

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FMCSA Commercial Driver's License - Test Reviews Sample Questions

 Potassium cyanide is an example of what hazardous material class?



Correct Answer:
class 6.


the question asked is about the classification of potassium cyanide in the context of hazardous material classes. hazardous materials are classified into nine different classes according to their physical and chemical properties, and each class is further divided into divisions. these classes are designed to provide a systematic approach to controlling and managing hazardous substances.

the correct answer to the question is class 6. this class is divided into two categories: class 6.1 for toxic substances and class 6.2 for infectious substances. a toxic substance is defined as a substance that can cause death, injury or harm to human health if it is swallowed, inhaled, or by skin contact. an infectious substance, on the other hand, is a substance that contains viable microorganisms or their toxins which are known or suspected to cause disease in humans or animals.

potassium cyanide falls under class 6.1 - toxic substances. this is because potassium cyanide is a highly toxic compound that can cause death if ingested, inhaled, or absorbed through the skin. it is used in many industries, including mining, electroplating, and organic synthesis, but due to its high toxicity, it must be handled with extreme care. despite its dangerous nature, potassium cyanide is not classified as an infectious substance, so it does not fall under class 6.2.

the other classes mentioned in the question - class 5, 7, and 8 - refer to other types of hazardous materials. class 5 includes oxidizing substances and organic peroxides, class 7 includes radioactive materials, and class 8 includes corrosive substances. potassium cyanide does not fall into any of these categories. so, it is incorrect to classify potassium cyanide under these classes.

in conclusion, knowing the correct hazardous material class of a substance is essential for its safe handling, transportation, and disposal. it helps in taking appropriate safety measures and precautions to prevent any adverse effects on humans, animals, and the environment. therefore, potassium cyanide, due to its toxic nature, is classified under class 6 of hazardous materials.

There is a roadway sign in the shape of a diamond. What does it communicate to drivers?



Correct Answer:
incident management.


roadway signs are essential tools for guiding and informing drivers about the road conditions, warnings, and regulations. a sign that is in the shape of a diamond often communicates warnings to drivers. these warnings could be about potential hazards or changes in the road conditions ahead. diamond-shaped signs are also used to alert drivers about potential incidents or particular zones like school zones.

one such diamond-shaped sign is the incident management sign. these signs are typically pink and are used to inform drivers about incidents such as accidents, natural disasters, or road work that may affect the usual traffic flow. these incidents could potentially cause hazards for drivers, so the sign warns them to be cautious or take alternative routes if possible.

another type of diamond-shaped sign is the recreation sign. these signs are typically used to indicate areas where recreational activities or facilities are available, such as parks or picnic areas. these signs are useful for drivers who are looking for places to stop and rest during long drives.

school zone signs, which are also diamond-shaped, are used to alert drivers that they are entering an area where they need to be especially cautious because children may be crossing the road or playing nearby. in these areas, drivers are often required to reduce their speed to ensure the safety of the children.

in conclusion, a roadway sign in the shape of a diamond is used to communicate warnings to drivers. these warnings could be about incidents, recreational areas, or special zones like schools. understanding these signs is crucial for ensuring road safety.

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