2. User Input-Controlled LED

What voltage does a Raspberry Pi GPIO pin output when set to HIGH?

• 1.8V

• 3.3V

• 5V

• Depends on the USB power supply

Which Python function pauses the program and waits for the user to type something?

• input()

• print()

• scan()

• sleep()

🖥️ Which code snippet correctly turns the LED OFF when the user types "off"?

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Which line correctly takes user input and makes it lowercase so the program works with “ON”, “on”, or “On”?

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A student wrote this code, but the LED stays ON forever even after typing off.
Which line is written incorrectly?

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Why do we need a resistor in series with the LED when connecting it to a Raspberry Pi GPIO pin?

• To increase brightness of the LED

• To limit current and protect the GPIO pin

• To reduce voltage from 5V to 3.3V

• To store charge like a capacitor

What will happen if you connect an LED in reverse (cathode to GPIO21 and anode to GND) on the Raspberry Pi?

• The LED will glow dimly

• The LED will not glow at all

• The LED will glow normally

• The LED will burn out immediately

The LED is on the breadboard, but it won’t glow. Which connection is missing?

• GPIO pin not connected

• LED reversed

• Resistor missing

• GND not connected

🖥️ Which is the correct way to place an LED on a breadboard?

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• Both are correct

🖥️ What does GPIO stand for in Raspberry Pi?

• General Power Input/Output

• General Purpose Input/Output

• Ground Pin Input/Output

• General Peripheral Input/Output