IoTF Quiz 4

**What is the primary function of a sensor in an IoT system?**

• To provide visual feedback to the user
• To measure physical input from the environment and convert it into data
• To control other devices and provide feedback
• To convert digital signals into analog signals

**Which of the following is an example of an analog sensor?**

• Digital Temperature IC
• Thermistor
• Ultrasonic Sensor
• OLED Display

**What is the main difference between analog and digital sensors?**

• Analog sensors are less precise than digital sensors.
• Analog sensors provide continuous data, while digital sensors provide discrete data.
• Digital sensors are used for measuring temperature, while analog sensors are used for measuring humidity.
• Analog sensors are more expensive than digital sensors.

**Which type of temperature sensor is known for its non-linear resistance-temperature relationship?**

• Thermocouple
• Thermistor
• Analog Temperature IC
• Digital Temperature IC

**What is the primary function of a humidity sensor?**

• To measure temperature and humidity
• To measure the humidity in the environment and convert it into an electrical signal
• To measure distance using ultrasonic waves
• To control the brightness of an LED

**Which of the following is an example of an output device in an IoT system?**

• Thermistor
• Ultrasonic Sensor
• LED
• Thermocouple

**What is the primary purpose of an actuator in an IoT system?**

• To measure physical input from the environment
• To provide visual feedback to the user
• To move and control a mechanism or system
• To convert analog signals into digital signals

**Which communication protocol is used for short-distance communication within a single device and requires only two signal wires?**

• GPIO
• I2C
• SPI
• UART

**What is the formula used to calculate distance using an ultrasonic sensor?**

• Distance = (Time * Speed)
• Distance = (Time * Speed) / 2
• Distance = (Speed / Time)
• Distance = (Time / Speed)

**Which of the following is an advantage of OLED displays over LCD displays?**

• Longer shelf life
• Lower cost of production
• Better image quality and reduced power consumption
• Higher brightness levels