Which of the following is a fundamental concept of Object-Oriented Programming (OOP)?
a) Inheritance
b) Compilation
c) Preprocessing
d) Linking
What does “encapsulation” in OOP refer to?
a) Protecting data from unauthorized access
b) Inheriting properties from a parent class
c) Creating a class from a template
d) Storing all objects in memory
Which of the following is an example of polymorphism in OOP?
a) Using the same method name for different types
b) Creating new classes from existing ones
c) Combining methods and attributes in a class
d) Restricting access to object data
In OOP, which concept allows a class to inherit properties and behaviors from another class?
a) Abstraction
b) Encapsulation
c) Inheritance
d) Polymorphism
Which of the following best describes abstraction in OOP?
a) Hiding the complexity and showing only the necessary features
b) Reducing the size of the code
c) Organizing code into multiple classes
d) Using different methods for different classes
What is a constructor in Object-Oriented Programming?
a) A method used to initialize an object
b) A special method to destroy an object
c) A function to create classes
d) A method used for inheritance
Which of the following is an example of an abstract class in OOP?
a) A class with no methods
b) A class that cannot be instantiated
c) A class that contains only private methods
d) A class that contains only static methods
What is the key advantage of using inheritance in OOP?
a) Code reuse
b) Security
c) Better performance
d) Reduced complexity
Which keyword is used to inherit a class in most OOP languages?
a) extend
b) inherit
c) super
d) extends
Which of the following is an example of method overloading in OOP?
a) Defining a method with the same name but different parameters
b) Using different class names for similar functions
c) Changing the data type of a variable
d) Changing the name of a method
Which of the following is true about polymorphism in OOP?
a) It allows multiple methods with the same name but different implementations
b) It restricts access to the attributes of a class
c) It allows a class to inherit from multiple parent classes
d) It simplifies the code by merging classes
In OOP, which access modifier makes a class member accessible only within its own class?
a) public
b) private
c) protected
d) default
What does the “super” keyword do in OOP?
a) It accesses methods from the superclass
b) It creates a new object
c) It calls the constructor of a subclass
d) It deletes the current object
Which of the following is NOT an OOP principle?
a) Polymorphism
b) Abstraction
c) Compilation
d) Inheritance
Which concept in OOP ensures that an object’s internal state cannot be changed directly?
a) Abstraction
b) Inheritance
c) Encapsulation
d) Polymorphism
Which of the following best describes a “getter” method in OOP?
a) A method that returns the value of an object’s private property
b) A method that sets the value of an object’s property
c) A method that creates a new object
d) A method that deletes an object
What is method overriding in OOP?
a) Creating a method with the same name in a subclass
b) Defining methods with different parameters
c) Replacing the functionality of a superclass method in a subclass
d) Creating a static method
What is the purpose of a “destructor” in OOP?
a) To create objects
b) To delete objects
c) To initialize an object
d) To modify an object’s state
Which of the following is true about encapsulation?
a) It hides an object’s data and allows access only through methods
b) It allows objects to inherit properties from other objects
c) It defines how an object interacts with other objects
d) It allows multiple objects to share the same memory space
Which of the following is an example of “composition” in OOP?
a) A class contains an instance of another class
b) A class inherits methods from another class
c) A class has a constructor
d) A class overrides a method from its parent class
Which of the following is a characteristic of a static method in OOP?
a) It can only be called using an instance of the class
b) It can be called without creating an object of the class
c) It can access only non-static fields
d) It can be overridden in a subclass
Which of the following terms refers to the ability of different objects to respond differently to the same method call in OOP?
a) Polymorphism
b) Encapsulation
c) Inheritance
d) Abstraction
In OOP, which of the following does NOT describe inheritance?
a) A subclass can inherit the properties of its parent class
b) A subclass can override methods from the parent class
c) A subclass can access private fields of the parent class
d) A subclass can add new properties and methods
Which of the following is the primary purpose of an interface in OOP?
a) To define a contract that classes must implement
b) To create an object
c) To specify how objects should interact with each other
d) To store data temporarily
What does “method resolution order” (MRO) refer to in OOP?
a) The order in which methods are executed in a class
b) The order in which constructors are called in inheritance
c) The order in which methods are inherited from the parent class
d) The order in which a program terminates
Which of the following is an example of “interface inheritance”?
a) A class extends another class
b) A class implements an interface
c) A class creates an instance of another class
d) A class uses method overriding
What is the main purpose of polymorphism in Object-Oriented Programming?
a) To allow objects to take multiple forms
b) To limit the functionality of a class
c) To provide inheritance to objects
d) To prevent methods from being overridden
Which of the following allows an object to inherit behaviors from multiple classes in OOP?
a) Abstraction
b) Composition
c) Inheritance
d) Multiple Inheritance
