Which of the following is a type of liquid level sensor?

Floats are a type of liquid level sensor that operate based on the principle of buoyancy. They typically consist of a buoyant object that rises and falls with the liquid level. As the float moves vertically, it can activate switches or transmit signals to indicate the liquid level within a tank or container. This method is widely used due to its simplicity and effectiveness in detecting and controlling liquid levels in various applications, such as water treatment facilities and storage tanks.

In contrast to floats, accelerometers, thermistors, and gyroscopes serve different functions. Accelerometers measure acceleration forces, thermistors are used to measure temperature by correlating resistance changes with temperature variations, and gyroscopes measure rotation or change in orientation. These devices do not provide direct measurements of liquid levels and are not designed for that specific application. Therefore, the float sensor stands out as the correct answer for identifying a type of liquid level sensor.