Object Oriented Programming MCQs

1. Which of the following is the correct definition of an object?

• • a) A collection of methods

• • b) A variable holding data

• • c) An instance of a class

• • d) A collection of classes

1. Which of the following represents a blueprint for creating objects in Object-Oriented Programming (OOP)?

• • a) Object

• • b) Class

• • c) Method

• • d) Message

1. Which of the following is true about methods in OOP?

• • a) Methods are used to store data in a class

• • b) Methods define the behavior of an object

• • c) Methods are only used for data access

• • d) Methods can only be invoked by other classes

1. Message passing in OOP refers to:

• • a) The method of communicating between different programming languages

• • b) A process of sending data to another object for processing

• • c) Transferring data between objects without any function call

• • d) Passing arguments to constructors

1. Which concept hides the internal implementation details and only exposes the necessary information to the user?

• • a) Polymorphism

• • b) Abstraction

• • c) Inheritance

• • d) Aggregation

1. What does inheritance in OOP allow you to do?

• • a) Allow objects to inherit behaviors from other objects

• • b) Allow classes to inherit behaviors from other classes

• • c) Allow methods to override each other

• • d) Allow multiple objects to share data

1. Which of the following is an example of polymorphism?

• • a) Multiple classes having the same method name but different parameters

• • b) A class inheriting the methods of its parent class

• • c) A class overriding a method of its parent class

• • d) All of the above

1. Which of the following is NOT a characteristic of abstraction in OOP?

• • a) Hiding the complex implementation details

• • b) Showing only relevant details to the user

• • c) Overloading methods

• • d) Simplifying interaction with objects

1. Which of the following is true about method overriding in OOP?

• • a) It allows a subclass to provide a specific implementation of a method that is already defined in its superclass

• • b) It allows overloading of methods with different return types

• • c) It prevents subclasses from modifying superclass methods

• • d) It is used to hide the functionality of a method in the subclass

1. What is an abstract class in OOP?

• • a) A class that contains only abstract methods and no concrete methods

• • b) A class that cannot be instantiated and may contain both abstract and concrete methods

• • c) A class that can be instantiated but cannot have abstract methods

• • d) A class that is fully implemented and cannot be inherited