Internet of Things (IoT) Practice Exam

Which classes does Bluetooth have?

1. Industrial, Scientific, Medical

2. Class 1, Class 2, and Class 3 (100m, 10m and 1m range)

3. I, M and R (Industrial, Mobile and Rarely used)

4. Basic, Advanced, and Pro

The correct answer is: Class 1, Class 2, and Class 3 (100m, 10m and 1m range)

Bluetooth technology is classified into three main classes based on transmission power and operational range, making the identification of these classes important for understanding Bluetooth applications. Class 1 devices can transmit up to 100 meters due to higher power output, making them suitable for scenarios where longer distance connectivity is needed. Class 2 devices typically operate at about 10 meters and are commonly used in consumer devices like smartphones and keyboards, striking a good balance between range and power consumption. Class 3 devices have the shortest range of about 1 meter, intended for low-power applications where close proximity is sufficient. The other options do not reflect Bluetooth's actual classification system. Industrial, Scientific, Medical refers to a frequency band used by several wireless technologies but does not represent Bluetooth classes. The terms I, M, and R as well as Basic, Advanced, and Pro are not recognized classifications within Bluetooth standards. Hence, understanding the power and range capabilities associated with Bluetooth device classes helps users choose the right devices for their IoT applications.