OOP LinkedIn Quiz: Master Object-Oriented Programming!

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| By Kasturi Chaudhuri
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  • 1/16 Questions

    What is the primary concept of Object-Oriented Programming (OOP)?

    • Functions
    • Objects and Classes
    • Inheritance
    • Data Structures
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About This Quiz

Get ready to tackle the LinkedIn Object-Oriented Programming quiz with our comprehensive practice test! This quiz is designed to help you master key OOP concepts such as classes, objects, inheritance, polymorphism, encapsulation, and abstraction. If you’re a beginner or an experienced programmer, this quiz offers valuable insights into the types of questions you’ll encounter during the LinkedIn assessment.

With questions that challenge your understanding of OOP principles, you’ll have the opportunity to improve your coding skills and deepen your knowledge. Each answer is accompanied by a detailed explanation, helping you grasp the reasoning behind the correct solution. Take the LinkedIn Object-Oriented Programming quiz today to sharpen your problem-solving skills, boost your confidence, and improve your chances of excelling in the actual assessment!

OOP LinkedIn Quiz: Master Object-oriented Programming! - Quiz

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  • 2. 

    Which of the following is an OOP principle that allows new classes to be derived from existing ones?

    • Abstraction

    • Inheritance

    • Polymorphism

    • Encapsulation

    Correct Answer
    A. Inheritance
    Explanation
    Inheritance allows a new class to inherit the properties and methods of an existing class. This mechanism is crucial for promoting code reusability, as it allows developers to write a class once and then extend it in different contexts. It also establishes a hierarchical class structure where a child class (or subclass) can inherit and extend the functionality of its parent class (or superclass). This leads to cleaner, more maintainable code as it avoids redundancy and encourages the reuse of common behaviors across multiple classes.

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  • 3. 

    Which keyword is used to define a class in most object-oriented programming languages?

    • Object

    • Class

    • Define

    • Function

    Correct Answer
    A. Class
    Explanation
    In most OOP languages, the class keyword is used to define a class. A class serves as a template or blueprint for creating objects, and its role is to specify what data (attributes) and behaviors (methods) the objects created from it will possess. The class itself does not represent real-world objects directly but rather defines the characteristics and actions that those objects will have once instantiated. This structure is fundamental to the concept of OOP and allows for efficient and clear modeling of real-world entities in code.

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  • 4. 

    In Object-Oriented Programming, what is a method?

    • A variable

    • A function within a class

    • An object of a class

    • A class constructor

    Correct Answer
    A. A function within a class
    Explanation
    A method is a function defined inside a class that can operate on the objects of that class. Methods define the actions or behaviors that objects of the class can perform. These methods can interact with the attributes of the object, modify them, or return values. In addition, methods can take parameters and return values, which allows them to be flexible and reusable in various contexts. Methods are what give life to the objects of a class by allowing them to perform operations and interact with other objects.

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  • 5. 

    What does encapsulation mean in OOP?

    • Grouping data and functions together

    • Hiding internal state of an object

    • Deriving new classes from existing ones

    • Overriding methods in subclasses

    Correct Answer
    A. Hiding internal state of an object
    Explanation
    Encapsulation refers to the bundling of data (attributes) and methods (functions) within a class, and restricting access to the object's internal state, typically using access modifiers such as public, private, or protected. By encapsulating the data and methods within a class, we ensure that the internal workings of the object are hidden from outside interference. This not only protects the data but also provides a clear interface for interacting with the object, allowing modifications to be controlled and ensuring that the object’s state remains consistent.

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  • 6. 

    What is polymorphism in Object-Oriented Programming?

    • The ability of objects to have multiple properties

    • The ability of one method to operate on different data types

    • A type of inheritance

    • The process of creating new classes

    Correct Answer
    A. The ability of one method to operate on different data types
    Explanation
    Polymorphism allows methods to have different implementations based on the object they are acting upon. It enables a single method to behave differently depending on the type of object or class it is applied to. This can occur through method overriding or overloading. Polymorphism increases flexibility and scalability in OOP, as the same method name can perform different tasks depending on the context, without needing to rewrite similar methods for each new type of object.

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  • 7. 

    What does the this keyword refer to in an object method?

    • The class object itself

    • A reference to the calling object

    • The parent class

    • A method inside the class

    Correct Answer
    A. A reference to the calling object
    Explanation
    The this keyword refers to the current instance of the object within the class. It allows you to access instance variables and methods in the object. It’s especially useful when there is a need to distinguish between the instance variables of the class and method parameters that might have the same name. Using this, you can refer explicitly to the object's attributes and methods, making sure you're working with the instance of the object rather than just local variables.

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  • 8. 

    What is an object in Object-Oriented Programming?

    • A function inside a class

    • An instance of a class

    • A constructor of a class

    • A special data type

    Correct Answer
    A. An instance of a class
    Explanation
    An object is an instance of a class. It represents a specific entity with defined attributes (data) and behaviors (methods) as specified by its class. When a class is defined, it serves as a blueprint for creating objects. Once an object is created, it possesses the properties and can invoke the behaviors defined in the class. Objects are the fundamental building blocks of OOP and allow developers to model real-world entities and processes in their software.

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  • 9. 

    Which of the following best describes abstraction in OOP?

    • Hiding the complexities of a system

    • A way to hide specific objects

    • The process of making objects more complex

    • A method to increase memory usage

    Correct Answer
    A. Hiding the complexities of a system
    Explanation
    Abstraction involves hiding complex implementation details and showing only the essential features of an object, simplifying interaction with it. Through abstraction, a programmer can focus on high-level operations without worrying about the low-level details. For instance, when using a car, you interact with the steering wheel and pedals without needing to understand the intricate workings of the engine. Similarly, abstraction in OOP hides the complexities of an object's implementation from the user, exposing only the necessary features through well-defined interfaces.

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  • 10. 

    What is the purpose of the constructor in a class?

    • To initialize the object’s attributes

    • To define object behaviors

    • To define methods

    • To call the parent class constructor

    Correct Answer
    A. To initialize the object’s attributes
    Explanation
    The constructor is a special method used to initialize the object's attributes when an instance of the class is created. It sets the initial state of the object, ensuring that all required values are properly set before the object is used. Constructors are called automatically when an object is instantiated, and they typically accept parameters that help initialize the object's properties. This ensures that every object starts with valid data and behaves as expected when methods are invoked.

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  • 11. 

    What is a class in Object-Oriented Programming?

    • A function that defines an object

    • A template or blueprint for creating objects

    • A variable that stores data

    • A method that defines behavior

    Correct Answer
    A. A template or blueprint for creating objects
    Explanation
    A class is a blueprint or template that defines the properties (attributes) and behaviors (methods) of objects. It serves as the foundation for object creation in OOP. While a class itself is not an object, it defines the structure and functionality that the objects created from it will have. A class helps organize and manage code, as objects are created based on the class and interact according to the rules specified within it.

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  • 12. 

    What is inheritance in OOP?

    • The ability to call a function from another class

    • A class inheriting properties from a parent class

    • A class method being invoked from another class

    • The creation of a new class object

    Correct Answer
    A. A class inheriting properties from a parent class
    Explanation
    Inheritance is the OOP principle where a class inherits properties and methods from another class. It allows for code reuse and the extension of existing functionality. Inheritance enables a new class (subclass or derived class) to inherit the behaviors and attributes of an existing class (superclass or parent class) while adding or modifying specific behaviors. This hierarchy of classes makes it easier to manage and maintain code, as the subclass can extend or override the inherited functionality.

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  • 13. 

    What is the difference between public and private access modifiers in OOP?

    • Public can only be accessed by the class, private by all objects

    • Public can be accessed by all classes, private by the class

    • Public can access data, private cannot

    • Public is for methods, private for variables

    Correct Answer
    A. Public can be accessed by all classes, private by the class
    Explanation
    In OOP, public members can be accessed by any other class, while private members can only be accessed by the class that defines them, providing data encapsulation. The public access modifier allows unrestricted access to the class's attributes and methods, while private restricts access, meaning that they cannot be accessed directly from outside the class. This encapsulation ensures that the object's internal state is protected and only modified through its methods, maintaining control over how data is manipulated.

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  • 14. 

    What is the main goal of Object-Oriented Programming?

    • To increase the memory usage

    • To enhance the performance of software

    • To provide a structure for organizing code

    • To make code more complicated

    Correct Answer
    A. To provide a structure for organizing code
    Explanation
    The main goal of OOP is to provide a structured way to organize code, making it more reusable, maintainable, and scalable. It organizes code into objects and classes, which model real-world entities and their interactions. By focusing on encapsulating data and behavior within objects, OOP allows for easier code maintenance, reduces redundancy, and provides a clear structure for developers to follow. This structure also promotes code reuse through inheritance and polymorphism.

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  • 15. 

    How does OOP promote code reusability?

    • By using loops to repeat code

    • By providing the ability to inherit functionality from other classes

    • By making objects static

    • By avoiding the use of functions

    Correct Answer
    A. By providing the ability to inherit functionality from other classes
    Explanation
    OOP promotes code reusability through inheritance. A class can inherit properties and methods from another class, allowing code to be reused and extended in subclasses. This reduces redundancy and makes the code easier to maintain, as common behaviors are centralized in a parent class and reused in child classes. It also enables you to add new functionality without modifying existing code, allowing for more flexible and scalable software design.

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  • 16. 

    Which of the following is a feature of a subclass in OOP?

    • It has no access to the superclass

    • It can access methods of its superclass

    • It cannot override methods of its superclass

    • It must create a new constructor

    Correct Answer
    A. It can access methods of its superclass
    Explanation
    A subclass inherits properties and methods from its superclass, and it can also override methods to provide its own implementation, extending the functionality of the parent class. Subclasses enable you to customize and extend the behavior of the superclass while retaining its core functionality. Overriding methods allows subclasses to modify or enhance the inherited behavior, making the object more suited to specific needs. This promotes flexibility and code reuse in object-oriented design.

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  • Current Version
  • Jun 08, 2025
    Quiz Edited by
    ProProfs Editorial Team
  • May 29, 2025
    Quiz Created by
    Kasturi Chaudhuri
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