Question

What is the use of the MQ2 Gas Sensor?

(a) Object Identification

(b) To provide 3G Connectivity

(c) To measure presence of gas

(d) To measure Wi-Fi strength

The question was posed to me during an online exam.

This intriguing question originated from MQ2 Gas Sensor Module topic in section Interfacing of Sensors, Actuators, and Other Modules of Arduino

Answer 1

Correct answer is (c) To measure presence of gas

Explanation: The MQ2 Gas sensor is used to measure the degree of presence of particular types of gases in the surrounding air. It can detect Methane, Butane, LPG and smoke quantities present in the air surrounding the sensor.