Object Oriented Programming OOP MCQs with Answers 2026

1. A class is:

a) An object    b) A blueprint for creating objects ✅    c) A variable    d) A function

2. An object is:

a) A class    b) An instance of a class ✅    c) A loop    d) A data type

3. A constructor is:

a) A destructor    b) Special method called when object is created ✅    c) A regular function    d) A variable

4. The this keyword refers to:

a) Parent class    b) The current object ✅    c) A static method    d) A global variable

5. Encapsulation means:

a) Inheriting properties    b) Binding data and methods together, hiding internals ✅    c) Overriding methods    d) Creating multiple objects

6. Data hiding is achieved through:

a) Public access    b) Private access modifiers ✅    c) Global variables    d) Static methods

7. Abstraction means:

a) Showing all details    b) Hiding complexity, showing only essentials ✅    c) Copying objects    d) Deleting classes

8. Inheritance allows:

a) Data hiding    b) A class to reuse properties of another class ✅    c) Function overloading    d) Operator overloading

9. The inherited-from class is called:

a) Child class    b) Derived class    c) Parent / Base / Super class ✅    d) Sub class

10. Multiple inheritance means:

a) One parent one child    b) A class inheriting from multiple parents ✅    c) No inheritance    d) Single inheritance

11. Method overriding occurs when:

a) Method is deleted    b) Child class provides own implementation of parent method ✅    c) Same name different parameters    d) Method calls itself

12. Polymorphism means:

a) One form    b) Many forms — same name different behavior ✅    c) No form    d) Hidden form

13. Compile-time polymorphism is achieved through:

a) Inheritance    b) Method overloading and operator overloading ✅    c) Encapsulation    d) Abstraction

14. Runtime polymorphism is achieved through:

a) Method overloading    b) Method overriding ✅    c) Constructors    d) Destructors