Object Oriented Programming MCQs

Which of the following is not a fundamental principle of object-oriented programming?
a) Encapsulation
b) Polymorphism
c) Inheritance
d) Abstraction
Answer: d) Abstraction

Which keyword is used to define a class in Java?
a) class
b) interface
c) extends
d) implements
Answer: a) class

What is the term used to describe the ability of an object to take on many forms?
a) Encapsulation
b) Inheritance
c) Polymorphism
d) Abstraction
Answer: c) Polymorphism

What is the term used to describe the process of hiding the internal details of an object from the outside world?
a) Abstraction
b) Encapsulation
c) Polymorphism
d) Inheritance
Answer: b) Encapsulation

Which principle of object-oriented programming describes the ability of a subclass to inherit properties and behavior from a superclass?
a) Encapsulation
b) Polymorphism
c) Inheritance
d) Abstraction
Answer: c) Inheritance

Which keyword is used to create an instance of a class in Java?
a) new
b) this
c) class
d) object
Answer: a) new

Which principle of object-oriented programming is used to organize data and behavior into self-contained units?
a) Encapsulation
b) Inheritance
c) Polymorphism
d) Abstraction
Answer: a) Encapsulation

Which keyword is used to refer to the current object in Java?
a) this
b) new
c) class
d) object
Answer: a) this

Which principle of object-oriented programming is used to create a general class that can be used to define more specific classes?
a) Abstraction
b) Inheritance
c) Polymorphism
d) Encapsulation
Answer: b) Inheritance

Which term is used to describe a special method that is automatically called when an object is created?
a) constructor
b) destructor
c) initializer
d) finalizer
Answer: a) constructor

Which principle of object-oriented programming is used to define a template for a class, including its data and methods?
a) Abstraction
b) Encapsulation
c) Inheritance
d) Polymorphism
Answer: a) Abstraction

Which keyword is used to prevent a method or variable from being overridden in a subclass?
a) private
b) final
c) static
d) protected
Answer: b) final

What is the term used to describe the process of creating a new class based on an existing class?
a) Encapsulation
b) Polymorphism
c) Inheritance
d) Abstraction
Answer: c) Inheritance

Which term is used to describe the process of creating multiple objects from a single class?
a) Polymorphism
b) Inheritance
c) Abstraction
d) Instantiation
Answer: d) Instantiation

Which principle of object-oriented programming allows objects of different classes to be treated as if they are of the same type?
a) Encapsulation
b) Polymorphism
c) Inheritance
d) Abstraction
Answer: b) Polymorphism

Which keyword is used to define a method that can be called without creating an instance of the class?
a) private
b) final
c) static
d) protected
Answer: c) static

Which term is used to describe a feature of object-oriented programming that allows a single name to refer to multiple methods with different parameters?
a) Method overloading
b) Method overriding
c) Method hiding
d) Method polymorphism
Answer: a) Method overloading

Which principle of object-oriented programming is used to define a common interface for a set of related classes?
a) Abstraction
b) Encapsulation
c) Polymorphism
d) Inheritance
Answer: a) Abstraction

Which keyword is used to define a class that cannot be instantiated and can only be used to define other classes?
a) abstract
b) final
c) static
d) public
Answer: a) abstract

Which term is used to describe a technique for preventing data from being accessed or modified by unauthorized code?
a) Encapsulation
b) Inheritance
c) Polymorphism
d) Data hiding
Answer: d) Data hiding

Which principle of object-oriented programming is used to group related classes and interfaces into a single unit of code?
a) Abstraction
b) Encapsulation
c) Polymorphism
d) Namespace
Answer: d) Namespace

Which keyword is used to allow a subclass to access a method or variable defined in its superclass?
a) private
b) final
c) static
d) protected
Answer: d) protected

Which term is used to describe a technique for creating a new class by combining the properties and methods of two or more existing classes?
a) Inheritance
b) Composition
c) Aggregation
d) Encapsulation
Answer: b) Composition

Which principle of object-oriented programming is used to define a set of related classes with a common interface?
a) Abstraction
b) Encapsulation
c) Polymorphism
d) Interface
Answer: d) Interface

Which term is used to describe a type of polymorphism where a single method can be used to perform different actions based on the type of object it is called on?
a) Static polymorphism
b) Dynamic polymorphism
c) Compile-time polymorphism
d) Run-time polymorphism
Answer: b) Dynamic polymorphism

Which keyword is used to define a method or variable that can only be accessed within the same class?
a) private
b) final
c) static
d) protected
Answer: a) private

Which term is used to describe the process of defining a new class based on an existing class, but with additional or modified features?
a) Inheritance
b) Polymorphism
c) Overloading
d) Overriding
Answer: a) Inheritance

Which principle of object-oriented programming is used to define a set of rules for the behavior of objects of a given class?
a) Abstraction
b) Encapsulation
c) Polymorphism
d) Interface
Answer: d) Interface

Which term is used to describe the process of creating a new object by copying the properties and methods of an existing object?
a) Inheritance
b) Cloning
c) Composition
d) Aggregation
Answer: b) Cloning

Which keyword is used to define a variable or method that can be accessed by any code in the same package?
a) private
b) final
c) static
d) public
Answer: d) public

Which principle of object-oriented programming is used to ensure that each object only has access to the data and methods that it needs to perform its functions?
a) Abstraction
b) Encapsulation
c) Inheritance
d) Polymorphism
Answer: b) Encapsulation

Which keyword is used to define a class member that can be accessed without creating an instance of the class?
a) private
b) final
c) static
d) protected
Answer: c) static

Which term is used to describe a technique for reusing code by allowing one class to use the properties and methods of another class without modifying its code?
a) Inheritance
b) Composition
c) Aggregation
d) Encapsulation
Answer: a) Inheritance

Which principle of object-oriented programming is used to define a set of rules for the interaction between objects of different classes?
a) Abstraction
b) Encapsulation
c) Polymorphism
d) Interface
Answer: d) Interface

Which term is used to describe the ability of an object to take on many forms or types?
a) Abstraction
b) Encapsulation
c) Inheritance
d) Polymorphism
Answer: d) Polymorphism

Which keyword is used to define a variable or method that can only be accessed by code in the same class or its subclasses?
a) private
b) final
c) static
d) protected
Answer: d) protected

Which term is used to describe the process of creating a new object from an existing object, but with the same properties and methods?
a) Cloning
b) Inheritance
c) Composition
d) Aggregation
Answer: a) Cloning

Which principle of object-oriented programming is used to group related variables and methods into a single unit of code?
a) Abstraction
b) Encapsulation
c) Polymorphism
d) Namespace
Answer: b) Encapsulation

Which term is used to describe the process of using an interface to create objects of different classes that all share the same behavior?
a) Inheritance
b) Polymorphism
c) Composition
d) Aggregation
Answer: b) Polymorphism

Which keyword is used to define a variable or method that can only be accessed within the same package or its subclasses?
a) private
b) final
c) static
d) protected
Answer: d) protected

Which principle of object-oriented programming is used to hide the internal details of an object and provide a public interface for interacting with it?
a) Abstraction
b) Encapsulation
c) Inheritance
d) Polymorphism
Answer: b) Encapsulation

Which keyword is used to prevent a class from being subclassed?
a) private
b) final
c) static
d) protected
Answer: b) final

Which term is used to describe the process of defining multiple methods with the same name, but different parameters?
a) Overloading
b) Overriding
c) Inheritance
d) Polymorphism
Answer: a) Overloading

Which principle of object-oriented programming is used to represent complex systems in a simplified way by focusing on the most important elements and ignoring irrelevant details?
a) Abstraction
b) Encapsulation
c) Inheritance
d) Polymorphism
Answer: a) Abstraction

Which term is used to describe the process of combining multiple objects into a single object that represents them all?
a) Cloning
b) Inheritance
c) Composition
d) Aggregation
Answer: d) Aggregation

Which keyword is used to define a variable or method that can be accessed by any code in the same package or its subclasses, as well as any code in other packages?
a) private
b) final
c) static
d) public
Answer: d) public

Which term is used to describe the ability of a subclass to override a method in its superclass with a new implementation?
a) Overloading
b) Overriding
c) Inheritance
d) Polymorphism
Answer: b) Overriding