MCQs on Fire Alarm using Arduino

What is the main purpose of a fire alarm system in Arduino projects?

• To turn on a fan

• To detect fire and trigger an alarm

• To measure temperature only

• To control a robot

Which sensor is commonly used to detect fire in an Arduino-based fire alarm project?

• Ultrasonic sensor

• IR sensor

• Flame sensor

• Sound sensor

What component produces sound when the fire is detected?

• LED

• Buzzer

• Servo motor

• LCD display

Which Arduino pin type is used to read the flame sensor’s output?

• Digital input pin

• Analog output pin

• Power pin

• Reset pin

What does the flame sensor detect?

• Smoke

• Light from a flame

• Carbon dioxide

• High temperature

If the flame sensor detects fire, what should happen in the fire alarm system?

• The buzzer should turn off

• The buzzer should turn on

• The Arduino should shut down

• The sensor should reset automatically

Which function in Arduino code is used to check if the sensor detects fire?

• digitalRead()

• analogWrite()

• pinMode()

• delay()

What power voltage does the Arduino board provide to the flame sensor?

• 3.3V

• 5V

• 9V

• 12V

Which statement is true about the working of a flame sensor?

• It detects sound waves from fire

• It detects infrared light emitted by flames

• It measures humidity in the air

• It produces heat to detect fire

Which software is used to write and upload code to the Arduino board?

• Scratch

• Arduino IDE

• TinkerCAD

• Python Notebook