Object-Oriented Programming Quizzes for Computer Science Students

Question 1

What is a potential drawback of object-oriented programming?

Accepted Answer

Increased complexity

Answer

Code reusability

Answer

Improved maintainability

Answer

Enhanced security

Question 2

What is the primary purpose of a constructor in a class?

Accepted Answer

To initialize an object's attributes

Answer

To define an object's methods

Answer

To create a new instance of a class

Answer

To provide access to an object's private data

Question 3

What is the fundamental distinction between a class and an object?

Accepted Answer

A class is a template, while an object is an instance

Answer

An object is a template, while a class is an instance

Answer

Classes and objects are interchangeable concepts

Answer

A class can inherit from an object, but not vice versa

Question 4

Which access modifier restricts class members to be accessible only within the class itself?

Accepted Answer

private

Answer

public

Answer

protected

Answer

internal

Question 5

What is the core principle behind polymorphism?

Accepted Answer

Objects of different classes can respond to the same message in unique ways

Answer

Methods with the same name can have different implementations based on their parameters

Answer

Classes can inherit from multiple parent classes

Answer

Operators can be overloaded to perform different tasks

Question 6

What is the purpose of method overloading?

Accepted Answer

To provide different implementations for a method based on its arguments

Answer

To allow multiple methods with the same name in a class

Answer

To inherit a method from a parent class

Answer

To create a static method in a class

Question 7

What is the primary purpose of encapsulation in OOP?

Accepted Answer

To hide data and implementation details from other parts of the program

Answer

To increase code reusability

Answer

To improve performance

Answer

To facilitate code maintenance

Question 8

Which type of inheritance allows a class to inherit from multiple parent classes?

Accepted Answer

Multiple

Answer

Single

Answer

Hierarchical

Answer

Multilevel

Question 9

How is a class different from an object?

Accepted Answer

A class is a blueprint, while an object is an instance of that class

Answer

A class is an object, while an object is a property of a class

Answer

A class is a method, while an object is a variable

Answer

There is no difference between a class and an object

Question 10

Which method is used in Java to override a method from a superclass?

Accepted Answer

override

Answer

super

Answer

this

Answer

final

Question 11

What is the function of the 'static' keyword in Java?

Accepted Answer

To declare a class method or variable that belongs to the class itself, not to any specific object

Answer

To create a new instance of a class

Answer

To override a method from a superclass

Answer

To make a method private

Question 12

Which of the following is NOT an advantage of object-oriented programming?

Accepted Answer

Reduced memory consumption

Answer

Improved code organization and maintainability

Answer

Increased code reusability

Answer

Improved security

Question 13

What is the purpose of the 'this' keyword in Java?

Accepted Answer

To refer to the current object

Answer

To call a method from a superclass

Answer

To create a new instance of a class

Answer

To pass an object as an argument to a method

Question 14

What is the primary purpose of a constructor in Java?

Accepted Answer

To initialize an object's attributes when it is created

Answer

To define an object's behavior

Answer

To provide access to an object's properties

Answer

To release resources when an object is destroyed

Question 15

Which of the following is not a fundamental characteristic of object-oriented programming?

Accepted Answer

Sequential programming

Answer

Encapsulation

Answer

Inheritance

Answer

Polymorphism

Question 16

What is the process of creating a new class based on an existing one in object-oriented programming called?

Accepted Answer

Inheritance

Answer

Encapsulation

Answer

Abstraction

Answer

Composition

Question 17

Which access specifier restricts access to class members within the class itself?

Accepted Answer

private

Answer

public

Answer

protected

Answer

internal

Question 18

What is the primary purpose of the 'override' keyword in Java?

Accepted Answer

To define a method in a derived class with the same name and signature as a method in the parent class

Answer

To prevent a method from being overridden in derived classes

Answer

To indicate that a method is abstract and must be implemented in derived classes

Answer

To call a method of the parent class from a derived class

Question 19

What is the main purpose of the 'this' keyword in Java?

Accepted Answer

To refer to the current object of the class

Answer

To invoke a method of the parent class

Answer

To access static members of the class

Answer

To create a new instance of the class

Question 20

Which of the following is an example of a concrete class?

Accepted Answer

Dog

Answer

Animal

Answer

AbstractAnimal

Answer

InterfaceAnimal

Question 21

Which of the following is not cited as an advantage of using object-oriented programming?

Accepted Answer

Increased program complexity

Answer

Enhanced code reusability

Answer

Improved maintainability

Answer

Stronger security

Question 22

What is the concept in OOP where an object has its own set of data and methods?

Accepted Answer

Encapsulation

Answer

Abstraction

Answer

Polymorphism

Answer

Inheritance