Python Classes MCQs - Test Your Knowledge of Object-Oriented Programming.

Challenge your understanding of Python classes with these multiple-choice questions. Perfect for beginners to practice key concepts like class creation, object instances, constructors, and methods in Python.

Multiple-Choice Questions (MCQs)

1. What keyword is used to define a class in Python?
   • A) object
   • B) class
   • C) define
   • D) declare

Watch this video for the answer: https://youtu.be/zVYzk_gnTY4

1. What is the correct way to create a class in Python?
   • A) class MyClass:
   • B) create MyClass:
   • C) define MyClass:
   • D) new MyClass:

Answer: a) class MyClass:

1. What is the correct way to create an object instance of a class?
   • A) Calling the class definition directly
   • B) Assigning the class name to a variable
   • C) Using the new keyword
   • D) Calling the class name with parentheses
2. What will be the output?

class Dog:
  name = "Unknown"

  def bark(self):
    print("Woof!")

dog1 = Dog()
dog1.name = "Buddy"
dog2 = Dog()

print(dog1.name, dog2.name)

• A) Buddy Unknown
• B) Unknown Unknown
• C) Buddy Buddy
• D) It depends on the dog breed

1. What is the purpose of the self parameter in a method?
   • A) To store the method name
   • B) To refer to the current object instance
   • C) To pass data to other methods
   • D) All of the above
2. What is the primary purpose of a class constructor?
   • A) To define the name of the class
   • B) To initialize the object’s data members
   • C) To allocate memory for the object
   • D) All of the above
3. What is the purpose of the __init__ method in a Python class?
   • A) To define static properties
   • B) To store the object’s type
   • C) To initialize the object’s attributes
   • D) To compare objects for equality
4. What will be the output of the following code?

class Test:
    def __init__(self, x):
        self.x = x

t = Test(5)
print(t.x)

• A) Error
• B) 0
• C) 5
• D) None

1. Which keyword is used to create an object of a class?
   • A) object
   • B) new
   • C) self
   • D) No keyword is needed
2. Identify the class attribute in the following code:

class Dog:
    species = "Canis familiaris"
    
    def __init__(self, name):
        self.name = name

d = Dog("Buddy")

- A) `name`  
- B) `species`  
- C) `__init__`  
- D) `Dog`

1. What will be the output of the following code?

class Car:
    wheels = 4  # Class attribute

    def __init__(self, color):
        self.color = color  # Instance attribute

car1 = Car("Red")
car2 = Car("Blue")
Car.wheels = 6

print(car1.wheels)
print(car2.wheels)

• A)

  4
  4
  

B)

6
6

C)

4
6

D) Error

1. Which of the following statements is true?
   • A) Instance attributes are shared across all instances.
   • B) Class attributes can only be accessed through class name.
   • C) Class attributes are shared across all instances.
   • D) Instance attributes are defined outside the __init__ method.

Correct Answer: C.
Explanation: Class attributes are shared across all instances. Instance attributes are unique to each object.

1. What happens if an instance modifies a class attribute?

class Item:
    category = "Grocery"

    def __init__(self, name):
        self.name = name

item1 = Item("Soap")
item1.category = "Cosmetic"

print(Item.category)
print(item1.category)

A)

Grocery
Cosmetic

B)

Cosmetic
Cosmetic

C)

Cosmetic
Grocery

D) Error