Magnificent Object Oriented Programming Test - 70+ MCQs: Object-Oriented Programming (OOP) Quiz: Test Your Understanding with Challenging Questions and Answers

1. How does the 'super' keyword work in Java and why is it used?

It is used to access the superclass's methods and fields in a subclass.

It is used to define constants in a class.

It is used to create objects directly.

It is used to implement polymorphism in Java.

2. What is the purpose of the 'final' keyword in OOP languages?

To indicate that a class cannot be instantiated

To specify that a method cannot be overridden

To define a constant variable

To allow access to private members of a class

3. What is the role of interfaces in OOP?

Defining the structure of a class

Implementing multiple inheritance

Providing a way to achieve abstraction

Allowing access to private members of a class

4. Examine the concept of method overriding in Object-Oriented Programming.

Using a single name to represent different forms of a function

Defining a contract for classes to implement common methods

Inheriting properties and behaviors from a parent class

Modifying or providing a specific implementation for a method in a subclass

5. What is the purpose of the 'this' keyword in object-oriented programming?

It is used to access the superclass's methods and fields in a subclass.

It is used to define constants in a class.

It is used to create objects directly.

It is used to refer to the current instance of the class and differentiate it from local variables with the same name.

6. What is the difference between method overloading and method overriding?

Method overloading involves creating a new class by combining existing classes.

Method overriding allows a subclass to provide a specific implementation of a method that is already provided by its superclass.

Method overloading is the practice of creating multiple objects of the same class with different attributes.

Method overriding is the process of defining constants in a class.

7. What is the difference between an abstract class and an interface?

An abstract class can have both abstract and non-abstract methods, while an interface can only have abstract methods

An abstract class cannot have any methods, while an interface can have both abstract and non-abstract methods

An abstract class cannot be inherited, while an interface can be inherited

An abstract class can be instantiated, while an interface cannot

8. In OOP, what is the purpose of an interface, and how does it promote code modularity?

Using a single name to represent different forms of a function

Deriving new classes with shared attributes and behaviors from existing classes

Defining a contract for classes to implement common methods

Allowing a class to have multiple methods with the same name but different parameters

9. Examine the concept of composition over inheritance in object-oriented programming.

Composition involves creating a new class by combining existing classes.

Composition allows a class to inherit properties and behavior from another class.

Composition is a way to design classes as a composition of other classes.

Composition emphasizes building classes based on the structure and behavior of existing classes.

10. What is the 'this' keyword in OOP languages like Java and C#?

It refers to the current instance of the class

It is used to create a new object

It is a reserved keyword for declaring variables

It points to the superclass of a class

Object-Oriented Programming MCQ Test 5