Quiz on Light Dependent Resistors (LDRs)

What is the function of a sensor?

• Detect changes in the environment

• Cook food

• Generate light

• Play music

Which of the following is another name for a photoresistor?

• Microphone

• Calculator

• Photoconductor

• Thermometer

How does an LDR work?

• By sensing the intensity of sound

• By sensing the intensity of light

• By sensing the temperature

• By sensing the humidity level

What type of voltage does an LDR give out when connected to VCC?

• Variable voltage

• Analog voltage

• Static voltage

• Digital voltage

What does the Arduino do with the analog voltage from the LDR?

• Converts it to light

• Converts it to sound

• Converts it to heat

• Converts it to digital value

What is the range of digital values read from the LDR through the Arduino when there is sufficient light?

• 0-100

• 200-500

• 1500-2000

• 0-1023

What is the first step in building an LDR Sensor and LED with Arduino and Breadboard?

• Connect the LDR to the breadboard

• Power the breadboard

• Connect the LED to the breadboard

• Connect the Arduino to the computer

Where should the cathode of the LED be connected in the breadboard?

• Positive rail

• Negative rail

• Pin 2

• Ground

What should be connected to the right leg of the LDR for communication?

• 10k ohm resistor

• Ground

• Pin A0

• LED

What is the purpose of the 10k ohm resistor in the LDR circuit?

• To measure the temperature

• To control the light intensity

• To communicate with the Arduino

• To provide resistance