PIF-Quiz Week 5 B

You want to turn on a ventilation fan when the temperature inside the greenhouse exceeds 30°C. Which of the following code snippets is the most appropriate?

• if (temperature < 30) { digitalWrite(fanPin, HIGH); }
• if (temperature > 30) { digitalWrite(fanPin, HIGH); }
• if (temperature == 30) { digitalWrite(fanPin, LOW); }
• if (temperature != 30) { digitalWrite(fanPin, LOW); }

You are using a soil moisture sensor that outputs an analog value. Which Arduino function should you use to read the sensor data?

• digitalRead()
• analogRead()
• pinMode()
• digitalWrite()

You want to connect a water pump to your Arduino. Since the pump operates at a higher voltage than the Arduino can provide, which component should you use?

• Resistor
• Capacitor
• Transistor
• Relay module

You want to display the temperature and humidity readings on an LCD screen. Which Arduino library should you include in your code?

• Servo.h
• LiquidCrystal.h
• Wire.h
• SPI.h

You want to automatically turn on the grow lights at 7:00 AM every day. Which Arduino module can help you achieve this?

• Ultrasonic sensor
• Real Time Clock (RTC) module
• GPS module
• Bluetooth module

You notice that your water pump is running continuously, even when the soil moisture level is high. Which of the following could be a possible cause of this problem?

• Faulty soil moisture sensor
• Incorrect wiring
• Error in the code
• All of the above

You want to store the temperature and humidity readings in an array for later analysis. Which data type should you use for the array?

• char
• int
• float
• boolean

You want to create a function to calculate the average temperature over a certain period. Which keyword should you use to indicate that the function will return a floating-point value?

• void
• int
• float
• double

You want to use a switch...case statement to control different actions based on the water level in the reservoir. Which variable type is most suitable for the switch expression?

• float
• boolean
• int
• char

You want to continuously monitor the soil moisture level and turn on the water pump only when the moisture level drops below a certain threshold. Which loop structure is most appropriate for this task?

• for loop
• while loop
• Both a and b
• Neither a nor b