Functions in programming:

1. allow modular approach
2. improve program readability
3. help in code reusability
4. All of these

The structure of function header in Python is:

1. "def" keyword followed by the function name and parameters
2. "func" keyword followed by the function name and parameters
3. "def" keyword followed by the return type, function name and parameters
4. "define" keyword followed by the function name and parameters

What is the purpose of return statement in Python functions?

1. It is used to terminate the execution of a function
2. It is used to define the output of a function
3. It is used to import modules into a function
4. None of these

What would be output of the following code snippet?

def multiply(x, y=2): 
    return x * y 
result = multiply(5) 
print(result)

1. 5
2. 10
3. 2
4. Error