Implementing Overriding through Polymorphism

Q1. What is the process of defining a method in a subclass having same name & type signature as a method in its superclass?
Q2. Which of these keywords can be used to prevent Method overriding?
Q3. Which of these is correct way of calling a constructor having no parameters, of superclass A by subclass B?
Q4. Which of these is supported by method overriding in Java?
Q5. Run time polymorphism is also known as _____.