Object Oriented Programming MCQs

By: Prof. Dr. Fazal Rehman | Last updated: February 20, 2024

  1. What is the primary goal of object-oriented programming? a. Code efficiency b. Code modularity c. Code reusability d. Code optimization
Answer: c. Code reusability
  1. Which of the following is not a fundamental concept of object-oriented programming? a. Inheritance b. Encapsulation c. Polymorphism d. Iteration
Answer: d. Iteration
  1. What is the process of combining data and code into a single unit known as? a. Encapsulation b. Inheritance c. Polymorphism d. Abstraction
Answer: a. Encapsulation
  1. In object-oriented programming, what is a class? a. An instance of an object b. A blueprint for creating objects c. A variable within an object d. A method for accessing class members
Answer: b. A blueprint for creating objects
  1. What is the term for creating a new object based on an existing object? a. Inheritance b. Composition c. Encapsulation d. Instantiation
Answer: d. Instantiation
  1. What is polymorphism in object-oriented programming? a. The ability of a class to inherit from multiple classes b. The ability of a class to have multiple methods with the same name c. The ability of a class to hide its internal implementation d. The ability of a class to encapsulate its data
Answer: b. The ability of a class to have multiple methods with the same name
  1. Which principle of OOP states that a subclass should be able to replace its parent class without affecting the program’s correctness? a. Encapsulation b. Polymorphism c. Inheritance d. Abstraction
Answer: c. Inheritance
  1. What is the concept of hiding the internal details of an object and only exposing the necessary functionality? a. Inheritance b. Encapsulation c. Polymorphism d. Abstraction
Answer: d. Abstraction
  1. What is the purpose of the “super” keyword in Java and similar languages? a. Refers to the superclass b. Refers to the subclass c. Refers to the current instance of the class d. Refers to the static members of the class
Answer: a. Refers to the superclass
  1. Which keyword is used to implement method overriding in Java? a. virtual b. override c. final d. extends
Answer: b. override
  1. What is the term for a blueprint of an object that defines its properties and behaviors? a. Object b. Class c. Method d. Instance
Answer: b. Class
  1. Which OOP concept allows a class to have multiple methods with the same name but different parameters? a. Inheritance b. Encapsulation c. Overloading d. Polymorphism
Answer: c. Overloading
  1. What is the term for the ability of an object to take on multiple forms based on its context? a. Inheritance b. Polymorphism c. Abstraction d. Encapsulation
Answer: b. Polymorphism
  1. In OOP, what is a constructor? a. A method that initializes an object’s state b. A variable that holds the object’s data c. A class that extends another class d. An interface for defining methods
Answer: a. A method that initializes an object’s state
  1. What is the term for the ability of a class to inherit from more than one class? a. Multiple inheritance b. Multilevel inheritance c. Hierarchical inheritance d. Single inheritance
Answer: a. Multiple inheritance
  1. What does the term “this” refer to in object-oriented programming? a. Refers to the superclass b. Refers to the current instance of the class c. Refers to the subclass d. Refers to the static members of the class
Answer: b. Refers to the current instance of the class
  1. Which OOP concept allows a class to inherit properties and behaviors from more than one class? a. Inheritance b. Encapsulation c. Polymorphism d. Multiple inheritance
Answer: d. Multiple inheritance
  1. In OOP, what is the term for creating a new class based on an existing class? a. Aggregation b. Composition c. Instantiation d. Inheritance
Answer: d. Inheritance
  1. What is the term for the process of combining multiple objects to create a new object? a. Aggregation b. Composition c. Encapsulation d. Instantiation
Answer: b. Composition
  1. Which keyword is used for preventing further modification of a class or method in Java? a. override b. final c. abstract d. static
Answer: b. final
  1. What is the term for a method that has the same name as a method in the superclass and provides a specialized implementation? a. Overloading b. Overriding c. Encapsulation d. Abstract method
Answer: b. Overriding
  1. Which OOP concept allows a class to implement multiple interfaces? a. Inheritance b. Encapsulation c. Polymorphism d. Interface implementation
Answer: a. Inheritance
  1. What is the purpose of the “interface” keyword in Java and similar languages? a. Defines a concrete class b. Declares a new data type c. Implements multiple inheritance d. Indicates a static method
Answer: b. Declares a new data type
  1. Which OOP concept allows a class to have more than one method with the same name but different implementations? a. Inheritance b. Polymorphism c. Encapsulation d. Abstraction
Answer: b. Polymorphism
  1. What is the term for a method that has no implementation in the superclass and must be implemented by the subclass? a. Abstract method b. Concrete method c. Final method d. Static method
Answer: a. Abstract method
  1. What is the significance of the “protected” access modifier in OOP? a. Allows access only within the same class b. Allows access within the same package and subclasses c. Allows access from any class in the program d. Prevents access from any class
Answer: b. Allows access within the same package and subclasses
  1. Which of the following is not a principle of SOLID design in OOP? a. Single Responsibility Principle (SRP) b. Open/Closed Principle (OCP) c. Liskov Substitution Principle (LSP) d. Nested Class Principle (NCP)
Answer: d. Nested Class Principle (NCP)
  1. What is the term for the ability of a class to provide a generic interface to a group of related classes? a. Polymorphism b. Abstraction c. Inheritance d. Encapsulation
Answer: b. Abstraction
  1. Which keyword is used for method overloading in Java? a. over b. load c. method d. overload
Answer: d. overload
  1. In OOP, what is the term for creating a new class by combining multiple classes? a. Composition b. Aggregation c. Instantiation d. Hybridization
Answer: a. Composition
  1. What is the purpose of the “abstract” keyword in OOP? a. Specifies that a class cannot be instantiated b. Specifies that a method must be implemented by the subclass c. Specifies that a class cannot be inherited d. Specifies that a method is static
Answer: a. Specifies that a class cannot be instantiated
  1. What is the term for a class that cannot be instantiated and is typically used as a base class? a. Abstract class b. Final class c. Concrete class d. Static class
Answer: a. Abstract class
  1. In OOP, what is the term for a mechanism that allows a method to behave differently based on the object it is acting upon? a. Inheritance b. Polymorphism c. Abstraction d. Encapsulation
Answer: b. Polymorphism
  1. Which OOP principle suggests that a class should have only one reason to change? a. Single Responsibility Principle (SRP) b. Open/Closed Principle (OCP) c. Liskov Substitution Principle (LSP) d. Interface Segregation Principle (ISP)
Answer: a. Single Responsibility Principle (SRP)
  1. What is the term for a relationship between two classes where one class includes the other? a. Composition b. Aggregation c. Inheritance d. Dependency
Answer: a. Composition
  1. Which OOP principle states that a class should be open for extension but closed for modification? a. Single Responsibility Principle (SRP) b. Open/Closed Principle (OCP) c. Liskov Substitution Principle (LSP) d. Interface Segregation Principle (ISP)
Answer: b. Open/Closed Principle (OCP)
  1. What is the purpose of the “superclass” in OOP? a. Provides a generic interface to a group of related classes b. Represents the parent class in inheritance c. Hides the internal details of an object d. Prevents further modification of a class
Answer: b. Represents the parent class in inheritance
  1. Which OOP principle suggests that objects of a superclass should be able to replace objects of a subclass without affecting program behavior? a. Single Responsibility Principle (SRP) b. Open/Closed Principle (OCP) c. Liskov Substitution Principle (LSP) d. Interface Segregation Principle (ISP)
Answer: c. Liskov Substitution Principle (LSP)
  1. What is the term for a relationship between two classes where one class is a part of the other and can exist independently? a. Composition b. Aggregation c. Inheritance d. Dependency
Answer: b. Aggregation
  1. Which keyword is used to declare a variable that can reference objects of multiple classes in Java? a. var b. any c. polymorphic d. Object
Answer: d. Object
  1. What is the purpose of the “interface” in OOP? a. Represents a specific type of object b. Declares a set of methods without implementation c. Implements a set of methods with default behavior d. Specifies the visibility of class members
Answer: b. Declares a set of methods without implementation
  1. Which OOP principle suggests that a class should not be forced to implement interfaces it does not use? a. Single Responsibility Principle (SRP) b. Open/Closed Principle (OCP) c. Liskov Substitution Principle (LSP) d. Interface Segregation Principle (ISP)
Answer: d. Interface Segregation Principle (ISP)
  1. In OOP, what is the term for a class that inherits from multiple classes? a. Derived class b. Base class c. Subclass d. Hybrid class
Answer: a. Derived class
  1. What is the term for a relationship between two classes where one class is dependent on the other? a. Composition b. Aggregation c. Inheritance d. Dependency
Answer: d. Dependency
  1. Which OOP principle suggests that a class should have a minimal number of methods and attributes? a. Single Responsibility Principle (SRP) b. Open/Closed Principle (OCP) c. Liskov Substitution Principle (LSP) d. Law of Demeter (LoD)
Answer: a. Single Responsibility Principle (SRP)
  1. What is the term for a method that has a common implementation in the superclass and can be overridden by the subclass? a. Abstract method b. Concrete method c. Final method d. Static method
Answer: b. Concrete method
  1. Which OOP concept allows a class to have more than one method with the same name and same parameters but different return types? a. Inheritance b. Polymorphism c. Encapsulation d. Overloading
Answer: b. Polymorphism
  1. In OOP, what is the term for creating a new class by combining properties and behaviors of multiple classes? a. Composition b. Aggregation c. Instantiation d. Hybridization
Answer: d. Hybridization
  1. What is the purpose of the “protected” keyword in OOP? a. Specifies that a class cannot be instantiated b. Specifies that a method must be implemented by the subclass c. Specifies that a class member can be accessed within the same package and subclasses d. Specifies that a class member is static
Answer: c. Specifies that a class member can be accessed within the same package and subclasses
  1. Which OOP principle suggests that a class should be easily extendable without modifying its existing code? a. Single Responsibility Principle (SRP) b. Open/Closed Principle (OCP) c. Liskov Substitution Principle (LSP) d. Law of Demeter (LoD)
Answer: b. Open/Closed Principle (OCP)

OOP MCQs 

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