Python OOPs Quiz - MCQ Questions and Answers

Welcome to our "Python OOPs Quiz - MCQ (Multiple Choice Questions) Questions and Answers" blog post. This quiz is designed for anyone eager to assess and deepen their understanding of Object-Oriented Programming (OOP) in Python. Perfect for learners at various levels, from beginners getting their feet wet in Python's OOP features to experienced developers looking to refresh their knowledge, this quiz covers a range of topics, including classes and objects, inheritance, encapsulation, polymorphism, and more. 

Each question is carefully crafted to test different aspects of OOP in Python, followed by insightful answers that will help reinforce your learning. So, gear up to challenge yourself and dive deep into the world of Python OOPs!

1. What is a class in Python?

a) A function

b) A blueprint for creating objects

c) A variable

d) A method

Answer:

b) A blueprint for creating objects

Explanation:

A class in Python defines the structure and behaviors of objects.

2. Which of the following is the correct way to define a class in Python?

a) class MyClass {}

b) class MyClass():

c) class MyClass:

d) MyClass class()

Answer:

c) class MyClass:

Explanation:

In Python, a class is defined using the class keyword followed by the class name and a colon.

3. What is an object in Python?

a) A function in a class

b) An instance of a class

c) A variable in a class

d) A method in a class

Answer:

b) An instance of a class

Explanation:

An object is an instance of a class, embodying the properties and behaviors defined in the class.

4. How do you create an object in Python?

a) MyClass object = new MyClass()

b) object = MyClass()

c) MyClass = object()

d) new MyClass()

Answer:

b) object = MyClass()

Explanation:

Objects in Python are created by calling the class like a function.

5. What is a method in a class?

a) A variable inside a class

b) A function defined inside a class

c) A class inside another class

d) An object created from a class

Answer:

b) A function defined inside a class

Explanation:

A method is a function that is defined inside a class and is associated with the objects of that class.

6. What is the first argument passed to any class method in Python?

a) cls

b) self

c) this

d) method

Answer:

b) self

Explanation:

In Python, 'self' refers to the instance of the class and is the first argument passed to class methods.

7. What is inheritance in Python?

a) Copying data from one object to another

b) Deleting an object

c) A class taking on attributes and methods of another class

d) Changing the value of an attribute

Answer:

c) A class taking on attributes and methods of another class

Explanation:

Inheritance allows a class (child class) to inherit attributes and methods from another class (parent class).

8. Which of the following is the correct syntax for inheritance in Python?

a) class ChildClass(ParentClass):

b) class ChildClass extends ParentClass:

c) ChildClass: ParentClass {}

d) class ChildClass inherits ParentClass:

Answer:

a) class ChildClass(ParentClass):

Explanation:

In Python, inheritance is defined by passing the parent class as a parameter to the child class.

9. What is encapsulation in Python?

a) Hiding the internal state of an object

b) Breaking an object into smaller parts

c) Inheriting properties from another class

d) Overriding methods in a child class

Answer:

a) Hiding the internal state of an object

Explanation:

Encapsulation involves keeping the internal state and implementation details of an object hidden from the outside world.

10. What is a constructor in Python?

a) A method that constructs the class attributes

b) A method that is called when an object is destroyed

c) A method that is automatically called when an object is created

d) A normal method inside a class

Answer:

c) A method that is automatically called when an object is created

Explanation:

A constructor in Python is a special method (__init__) that is automatically called when an object of a class is created.

11. What is polymorphism in Python?

a) Changing the form of an object

b) The ability of different classes to have methods with the same name

c) Splitting a class into multiple subclasses

d) Combining multiple classes into one

Answer:

b) The ability of different classes to have methods with the same name

Explanation:

Polymorphism allows different classes to have methods with the same name but potentially different implementations.

12. How do you define a private attribute in Python?

a) Using the private keyword

b) Prefixing the attribute name with a single underscore (_)

c) Prefixing the attribute name with double underscores (__)

d) Private attributes cannot be defined in Python

Answer:

c) Prefixing the attribute name with double underscores (__)

Explanation:

In Python, private attributes are conventionally defined by prefixing the attribute name with double underscores.

13. What is the purpose of the __init__ method in Python?

a) To initialize the object's attributes

b) To create a new object

c) To inherit methods from the parent class

d) To encapsulate data

Answer:

a) To initialize the object's attributes

Explanation:

The __init__ method in Python is used to initialize the object's state by setting the initial values of the object's attributes.

14. How can you access the parent class methods in a child class?

a) Using the super() function

b) By directly calling the parent class method

c) Using the parent class name

d) Both a and c

Answer:

d) Both a and c

Explanation:

The super() function or the parent class name can be used to access methods of the parent class in a child class.

15. What is a class variable in Python?

a) A variable that is shared by all instances of a class

b) A variable that is unique to each instance of a class

c) A variable that is defined outside of a class

d) A variable that stores the class itself

Answer:

a) A variable that is shared by all instances of a class

Explanation:

A class variable is shared by all instances of a class, meaning that it has the same value for every instance.

16. What are instance variables in Python?

a) Variables defined inside a method

b) Variables that are shared across all instances of a class

c) Variables that are unique to each instance of a class

d) Variables that store instances of the class

Answer:

c) Variables that are unique to each instance of a class

Explanation:

Instance variables are variables whose values are specific to and vary for each instance of a class.

17. What is the correct way to define a static method in Python?

a) Using the @staticmethod decorator

b) static def methodName():

c) def static methodName():

d) @static def methodName():

Answer:

a) Using the @staticmethod decorator

Explanation:

A static method in Python is defined using the @staticmethod decorator above the method definition.

18. What does overriding a method mean in Python?

a) Renaming a method in a child class

b) Deleting a method from the parent class

c) Providing a new implementation for a method in a child class

d) Calling a method from the parent class

Answer:

c) Providing a new implementation for a method in a child class

Explanation:

Overriding a method involves providing a new or modified implementation for an inherited method in a child class.

19. What is the output of isinstance(obj, Class) if obj is an instance of Class?

a) obj

b) Class

c) True

d) False

Answer:

c) True

Explanation:

The isinstance() function checks if an object (obj) is an instance of a specified class (Class) and returns True if it is.

20. What is the purpose of the __str__ method in Python?

a) To return the string representation of an object

b) To convert an object to a string

c) To print the object

d) To concatenate strings

Answer:

a) To return the string representation of an object

Explanation:

The __str__ method returns a human-readable string representation of an object, typically used for printing the object.