Motion Sensor Light MCQs

What is the primary objective of this project?

• To build a temperature-controlled fan.

• To automatically turn on a light via relay when motion is detected.

• To create a sound-activated switch.

• To measure the intensity of ambient light.

Which component is described as a "microcontroller board with Wi-Fi and GPIO pins"?

• IR Motion Sensor

• Relay Module

• ESP32 Dev Board

• Breadboard

What is the function of the IR Motion Sensor in this project?

• It controls high-voltage devices.

• It indicates when motion is detected visually.

• It detects human motion using infrared radiation.

• It provides power to the circuit.

The Relay Module is used to control what kind of devices?

• Low-voltage DC motors.

• External high-voltage devices like AC lights.

• Other microcontrollers.

• USB peripherals.

Why is a 220Ω resistor included in the component list?

• For controlling the relay.

• For detecting motion.

• For LED current limiting.

• For increasing the Wi-Fi signal.

What are the two stated purposes of the USB Cable?

• To power the relay and connect to the internet.

• To power the ESP32 and upload code.

• To charge the LED and transfer data.

• To connect the breadboard and the sensor.

An IR sensor is an electronic device that emits light to sense objects and can also measure an object's what?

• Mass

• Color

• Heat

• Speed

Is the radiation from an IR LED visible to the human eye?

• Yes, it looks like a normal LED.

• No, the radiation emitted by it is invisible.

• Yes, it is a very bright white light.

• Only when looking through a camera.

In an IR sensor, what component acts as the emitter and which acts as the detector?

• Emitter: IR Photodiode, Detector: IR LED.

• Emitter: IR LED, Detector: IR photodiode.

• Emitter: Resistor, Detector: ESP32.

• Emitter: Relay, Detector: Sensor.

What is the underlying working principle of the IR sensor?

• A photodiode's resistance and voltage change in proportion to the IR light received.

• The sensor gets hotter when an object is near.

• The sensor measures the time it takes for light to reflect.

• The sensor creates a small magnetic field.