What is the purpose of the keyword volatile in Arduino?

• To define a constant value
• To declare a variable with a fixed value
• To indicate that a variable's value might change unexpectedly
• To create a pointer variable
• To define a function

Which function is used to read the state of a button connected to digital pin 2?

• pinMode(2, INPUT)
• digitalWrite(2, HIGH)
• digitalRead(2)
• analogRead(2)
• Serial.read(2)

What is the difference between Serial.print() and Serial.println() in Arduino?

• Serial.print() displays text, while Serial.println() displays numbers
• Serial.print() displays data without a new line, while Serial.println() adds a new line
• Serial.print() sends data to the Arduino, while Serial.println() receives data
• Serial.print() is used for debugging, while Serial.println() is used for normal output
• There is no difference

What is the purpose of the millis() function in Arduino?

• To generate a random number
• To measure the voltage on an analog pin
• To return the number of milliseconds since the program started running
• To delay the program execution for a specified number of milliseconds
• To read the state of a button

What does the following code snippet do? <br> if (digitalRead(buttonPin) == HIGH) {<br> // Code to execute<br> }

• Executes the code block if the button is pressed
• Executes the code block if the button is not pressed
• Configures the button pin as an input
• Configures the button pin as an output
• Prints the button state to the Serial Monitor

What is the purpose of the else keyword in an if statement?

• To specify an alternative code block to execute if the if condition is false
• To repeat a block of code multiple times
• To define a function
• To declare an array
• To end the program

What does the following code snippet do? <br> while (true) {<br> // Code to be executed<br> }

• Executes the code block once
• Executes the code block a fixed number of times
• Executes the code block indefinitely
• Causes a compile-time error
• Prints the value of true to the Serial Monitor

What is the purpose of the break; statement in a loop?

• To skip to the next iteration of the loop
• To pause loop execution
• To exit the loop completely
• To define a new variable
• To restart the loop from the beginning

What is the correct syntax for defining a function named myFunction that takes two integer arguments and returns a float value?

• function myFunction(int a, int b) { ... }
• void myFunction(float a, float b) { ... }
• float myFunction(int a, int b) { ... }
• int myFunction(float a, float b) { ... }
• myFunction(int a, int b): float { ... }

What does the following code snippet do? <br> int result = calculateSum(5, 10);

• Assigns the value 5 to the variable result
• Assigns the value 10 to the variable result
• Calls the function calculateSum with arguments 5 and 10 and assigns the returned value to result
• Defines a function named calculateSum
• Prints the value of result to the Serial Monitor