Grade 9 - Traffic Light System Quiz

The Green LED turns on when the pushbutton is pressed.

• True

• False

The function digitalWrite() is used to read the state of a pin.

• True

• False

The function pinMode() is used to define whether a pin is an input or output.

• True

• False

If the pushbutton is not pressed, the traffic light sequence does not start.

• True

• False

The three LEDs in the circuit are connected to the same pin on the Arduino.

• True

• False

What happens after the Red LED turns OFF?

• The Yellow LED turns ON for 2 seconds

• The program stops running

• The Green LED turns ON immediately

• The pushbutton is disabled

How does the Yellow LED behave when the pushbutton is pressed?

• It turns ON and stays ON

• It stays OFF throughout the cycle

• It turns OFF immediately

• It blinks for 3 seconds

What is the purpose of the Red LED in this project?

• To indicate the system is ON

• To turn on the Yellow LED

• To control the pushbutton

• To show that vehicles must stop

How long does the Red LED stay ON?

• 2 seconds

• 3 seconds

• 6 seconds

• 10 seconds

What will happen if the pushbutton is pressed?

• The Green LED will turn ON

• The Red LED will turn ON immediately

• The Green LED will turn OFF, and the Yellow LED will blink for 3 seconds

• The Yellow LED will blink continuously