EmTech Pop Quiz 2

What is the correct function to turn on an LED connected to an Arduino digital pin?

• digitalWrite(pin, HIGH);

• analogWrite(pin, LOW);

• pinMode(pin, OUTPUT);

• delay(1000);

Which of the following libraries is required to interface a 16x2 character LCD with an Arduino using an I2C module?

• Wire.h

• LiquidCrystal.h

• LiquidCrystal_I2C.h

• Servo.h

In a 16x2 LCD, what does "16x2" indicate?

• The LCD has 16 data pins and 2 control pins

• The LCD can display 16 pixels per row in 2 rows

• The LCD has 16 characters per row and 2 rows

• The LCD supports 16-bit data transmission with 2 data buses

If you want to display the message "Hello, World!" on an LCD connected to an Arduino, which function should you use?

• lcd.show("Hello, World!");

• lcd.print("Hello, World!");

• lcd.display("Hello, World!");

• lcd.write("Hello, World!");

How many keys are present in a 4x4 membrane keypad?

• 8

• 12

• 16

• 20

Which type of signal does a water level sensor typically output?

• Only digital

• Only analog

• Both analog and digital

• None of the above

What principle does a rain detector sensor use to detect rain?

• Change in temperature due to water conductivity

• Change in resistance due to water conductivity

• Change of Infrared radiation due to water conductivity

• Change of radio frequency due to water conductivity

If a 4x4 keypad is connected to an Arduino, how many pins are typically required to interface with it?

• 4

• 8

• 12

• 16

What is the main function of a piezo buzzer in an Arduino project?

• Generate sound or alerts

• Detect motion

• Measure distance

• Sense temperature

Which two pins of an ultrasonic sensor (HC-SR04) are used to send and receive ultrasonic waves?

• VCC and GND

• Trig and Echo

• Analog and Digital

• SDA and SCL