An ultrasonic sensor is an example of which type of sensor?

• A. Digital
• B. Inductive
• C. Analog
• D. Capacitive

Answer: (C)

The main idea here is how the sensor’s output represents a measurement. An ultrasonic sensor measures distance by sending a sound wave and timing its return. The result is a continuous quantity, and the electrical signal it produces (a voltage or current) varies smoothly as distance changes. That continuous, proportional output is what makes it an analog sensor.

Inductive and capacitive sensors typically respond to proximity or material properties with discrete on/off states or sensor-specific changes, not a continuous distance value. A digital sensor would give a binary result or a fixed pulse pattern rather than a smoothly varying signal. So the ultrasonic sensor is best described as analog because its output can continuously represent the measured distance.