IOT systems and Protocols

1.What type of processor core does the Raspberry Pi 4 Model B utilize?

• Quad-core Cortex-A53

• Dual-core Cortex-A72

• Quad-core Cortex-A72

• Octa-core Cortex-A72

Which of the following is NOT a connectivity feature of the Raspberry Pi 4 Model B?

• Gigabit Ethernet

• USB 3.0 ports

• VGA port

• Dual-band Wi-Fi (2.4 GHz and 5.0 GHz)

The standard GPIO header on the Raspberry Pi 4 has how many pins?

• 26

• 30

• 40

• 50

Which RPi.GPIO function is used to set a GPIO pin as an output?

• GPIO.input()

• GPIO.output()

• GPIO.mode(pin, 'output')

• GPIO.setup(pin, GPIO.OUT)

. What is the purpose of GPIO.cleanup() in an RPi.GPIO Python script?

• To delete the Python script file.

• To uninstall the RPi.GPIO library.

• To reset all GPIO pins to their default state (inputs) and release resources.

• To clear the console output.

To introduce a delay in a Python script for a Raspberry Pi, which function from the time module is commonly used?

• time.delay()

• time.pause()

• time.wait()

• time.sleep()

For an input switch connected to a Raspberry Pi GPIO, which RPi.GPIO option helps prevent "floating" states when the switch is not pressed?

• pull_up_down=GPIO.PUD_OFF

• pull_up_down=GPIO.PUD_IN

• pull_up_down=GPIO.PUD_UP or GPIO.PUD_DOWN

• pull_up_down=GPIO.ANALOG

When programming the HC-SR04, what is the formula to calculate the distance based on the time taken for the ultrasonic pulse to return?

• Distance = Speed of Sound * Time

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

• Distance = Time / Speed of Sound

• Distance = (Speed of Sound + Time) / 2

The DHT11 sensor is primarily used to measure which two environmental parameters? a) Light

• Temperature and pressure

• Temperature and humidity

• Gas concentration and air quality

• humidity and pressure

Which communication protocol is typically used to interface an LCD display with Raspberry Pi, requiring only two data lines?

• SPI (Serial Peripheral Interface)

• UART (Universal Asynchronous Receiver-Transmitter)

• I2C (Inter-Integrated Circuit)

• Parallel