Question

What is the use of the LDR Sensor?

(a) Monitors Motion

(b) Monitors air pressure

(c) Monitors Light Intensity

(d) Monitors heartbeat

I have been asked this question at a job interview.

This is a very interesting question from LDR Sensor topic in section Interfacing of Sensors, Actuators, and Other Modules of Arduino

Answer 1

The correct answer is (c) Monitors Light Intensity

Best explanation: An LDR Sensor is used to measure the light intensity of the space surrounding it. Similar variations of these kinds of sensors are used in phones which allow manufacturers to turn off the screen when you place your phone to your ear during a call.