Quiz 7B part A

What is the main function of an LED in a traffic signaling project?

• Indicate when to stop or go.

• Control the speed of traffic.

• Measure the distance between vehicles.

• Regulate ambient temperature.

What is the primary function of a photoresistor in an automatic lighting project?

• Regulate the environment's temperature.

• Detect the presence of nearby objects to change the light.

• Measure soil humidity.

• Adjust the brightness of the lights according to ambient light.

Why is it important to use a resistor when connecting an LED to an Arduino?

• To increase the intensity of the light emitted by the LED.

• To prevent the LED from burning out due to excessive current.

• To change the color of the light emitted by the LED.

• To reduce the amount of light emitted by the LED.

What is the main application of an ultrasonic sensor in an automated parking project?

• Measure soil humidity.

• Detect nearby objects to avoid collisions.

• Control ambient temperature.

• Regulate the intensity of light in a room.

What type of signal can have values like 0.5, 1.2, or 3.8?

• Digital signal.

• Analog signal.

• PWM signal.

• Radiofrequency signal.

Which of the following components is commonly used to measure light in an Arduino project?

• Ultrasonic sensor.

• Potentiometer.

• Photoresistor.

• Servomotor.

Which of the following statements best describes an analog signal?

• It is a signal that can only take values 0 or 1.

• It is a signal that can take any value.

• It is a signal that can only represent integers.

• It is a signal that cannot be processed by a microcontroller.

What is the main function of a servomotor in an automatic door project?

• Regulate the pressure of the door.

• Count the number of people entering through the door.

• Open and close the door according to received instructions.

• Measure the distance between objects.

What type of signal does an ultrasonic sensor send to measure distances?

• Radiofrequency signal.

• Digital signal.

• Analog signal.

• PWM signal.

Which of the following situations represents an example of an analog signal in everyday life?

• Turning a light switch on or off.

• Pressing a button to start a game on a video game console.

• Changing the TV channel with a remote control.

• Adjusting the radio volume by turning a dial.