Q1. Which sensor can measure light intensity?
A1. The LDR (Light Dependent Resistor) measures light intensity.

Q2. What does an ultrasonic sensor measure?
A2. The Ultrasonic Sensor measures distance by sending and receiving sound waves.

Q3. Which pin type do we usually connect sensors to in Arduino?
A3. Analog pins (A0–A5) for continuous values (like light/temperature) and Digital pins for signals like distance.

Q4. What is the function of a breadboard in this activity?
A4. The breadboard helps organize and connect sensors to the Arduino without soldering.