Ultrasonic Sensor Basics Quiz

What is the primary function of an ultrasonic sensor?

• To measure temperature

• To measure distance using sound waves

• To detect light intensity

• To measure humidity

Which of the following is the correct sensor used in Arduino to measure distance?

• DHT11

• LM35

• HC-SR04

• TMP36

In the HC-SR04 ultrasonic sensor, what is the role of the Trigger pin?

• It emits the sound wave to measure distance.

• It receives the reflected sound wave.

• It generates a pulse to initiate the sensor's action.

• It displays the distance on an LCD screen.

What does the Echo pin do in the HC-SR04 sensor?

• Sends a pulse to trigger the measurement.

• Receives the reflected sound waves and sends a signal back.

• Displays the distance on the screen.

• Powers the ultrasonic sensor.

In an Arduino sketch, if you need to wait for the echo to be received by the ultrasonic sensor, which function should you use?

• delay()

• digitalWrite()

• pulseIn()

• analogWrite()

What would happen if the distance calculated by the ultrasonic sensor is too short or too long?

• The sensor would stop working.

• The Arduino would display an error message.

• The sensor might return incorrect or unreliable data.

• The sensor would automatically reset.

Which of the following is a common application for ultrasonic sensors in robotics?

• Temperature sensing

• Distance measurement and object avoidance

• Sound recording

• Light intensity measurement

Which Arduino function is typically used to send a HIGH pulse from the Trigger pin in an HC-SR04 sensor?

• analogWrite()

• digitalWrite()

• pulseIn()

• delay()

How would you prevent errors when measuring distances using ultrasonic sensors?

• Use higher voltage

• Ensure the sensor is positioned at a 90-degree angle to the object

• Always use a long delay between pulses

• Place the sensor in a confined space

Where do you connect the VCC pin of an ultrasonic sensor on the Arduino Uno?

• Pin 13

• Pin 5V

• Pin GND

• Pin 9