Arduino Hardware and Programming Quiz

What is the universal color for the GND (ground) wire in electronic circuits?

• Red

• Black

• Yellow

• Green

What is the universal color for the VCC (power supply) wire in electronic circuits?

• Black

• Red

• Blue

• White

If you connect an LED directly to a 5V pin without a resistor, what will likely happen?

• The LED will blink.

• The LED will not light up.

• The LED may burn out due to excessive current.

• The LED will work perfectly.

What Arduino pinMode() setting should be used for a pin connected to an LED?

• INPUT

• OUTPUT

• INPUT_PULLUP

• None of the above

Where should the longer leg (anode) of an LED be connected in the circuit?

• Ground (GND)

• VCC (5V)

• A digital or PWM pin on the Arduino

• It doesn't matter

What is the function of a current-limiting resistor when used with an LED?

• To increase the brightness of the LED

• To protect the LED by reducing current

• To prevent the circuit from heating up

• To act as a switch

Which color code is commonly used for wires connected to signal or data pins in a circuit?

• Blue or Green

• Black

• Red

• Yellow

You have three LEDs: Red, Green, and Blue. If each LED is controlled by a separate button, how should the circuit be wired?

• All anodes connected to GND and cathodes to digital pins

• Anodes connected to VCC with current-limiting resistors, cathodes to digital pins

• Anodes to digital pins with no resistors, cathodes to GND

• Anodes and cathodes connected directly to GND

In a program, if the code reads `digitalWrite(3, HIGH);`, what happens to the LED connected to pin 3?

• The LED turns off.

• The LED turns on.

• The LED blinks automatically.

• The program will throw an error.

What does `digitalRead()` do in an Arduino program?

• Sets the state of an output pin

• Reads the state of an input pin

• Controls the brightness of an LED

• Blinks an LED