Day 2 Wipro

Which of the following concepts means "wrapping up of data and methods"?

• Inheritance

• Encapsulation

• Abstraction

• Polymorphism

Which concept of OOP is used for code reusability?

• Inheritance

• Encapsulation

• Polymorphism 

• Abstraction

Which of the following allows runtime method binding?

• Static polymorphism

• Function overloading

• Dynamic polymorphism

• Method hiding

Which keyword is used to call the constructor of a superclass?

• super

• this

• extends

• base

Which of these cannot be used to achieve polymorphism?

• Method overloading

• Method overriding

• Constructor overloading

• Variable hiding

Which modifier makes a variable accessible in subclasses only?

• private

• protected

• public

• default

Which keyword is used to prevent method overriding?

• static

• private

• final

• abstract

Which concept hides internal implementation from the user?

• Inheritance

• Abstraction

• Polymorphism

• Overloading

What is the base class of all classes in Java?

• java.base

• java.lang.Object

• System

• Main

Which interface should a class implement to become threadable?

• Runnable

• Callable

• Cloneable

• Threadable