If return statement is not used inside the function, the function will return:

1. 0
2. None object
3. an arbitrary integer
4. Error! Functions in Python must have a return statement.

Which of the following keywords marks the beginning of the function block?

1. func
2. define
3. def
4. function

Find the errors in following function definitions :

1.

    def main()  
        print ("hello")
    

2.

   def func2():  
        print(2 + 3)
    

3.

   def compute():   
        print (x * x)
    

4.

   square (a)  
        return a * a  
   

What is the default return value for a function that does not return any value explicitly ?

1. None
2. int
3. double
4. null