Introduction to Analog and Digital I/O

Which type of signal uses discrete values to represent information?

• Digital signal

• Analog signal

• Both analog and digital signals

• None of analog & digital signals

In digital electronics, what does the term 'pulse width' refer to?

• The frequency of the digital signal

• The amplitude of the digital signal

• The time duration of a single high or low pulse in a signal

• The voltage level of the digital signal

Analog signals are characterized by:

• Continuous variation

• Discrete levels

• Binary representation

• None of the these

Which type of signal is more immune to noise and distortion?

• Analog signal

• Digital signal

• Both are equally immune

• It depends on the application

What is the default state of an Arduino "digital pin" immediately after it is initialized?

• HIGH

• LOW

• INPUT

• OUTPUT

Which of the following digital sensors typically outputs a digital signal?

• Potentiometer

• Thermistor

• Hall Effect Sensor

• Photocell

A sensor that outputs a voltage proportional to temperature is an example of:

• Digital input

• Analog input

• Digital output

• Analog output

PWM (Pulse Width Modulation) is used for:

• Converting analog signals to digital signals

• Converting digital signals to analog signals

• Modulating digital signals for transmission

• None of the above

Which Arduino function is used to configure a "digital pin" as an input?

• digitalWrite()

• pinMode()

• analogWrite()

• analogRead()

Which type of input is typically used in microcontroller-based systems for reading temperature from a sensor?

• Analog input

• Digital input

• Pulse input

• Serial input