Multiple Choice Questions (MCQs) on Inheritance in Python – OOP Practice

Q1. What is the output of the following code?

class Animal:
    def speak(self):
        print("Animal speaks")

class Dog(Animal):
    pass

d = Dog()
d.speak()

• 🟢 A. Animal speaks
• 🔵 B. Dog speaks
• 🟠 C. Error: **speak()** not defined
• 🔴 D. Nothing

Q2. What is the main purpose of inheritance in Python?

• 🟢 A. To create multiple objects of a class
• 🔵 B. To reuse code and extend functionality
• 🟠 C. To define private methods in a class
• 🔴 D. To create a new programming paradigm

Q3. Which of the following is the correct syntax for inheritance in Python?

• 🟢 A. class Child inherits Parent:
• 🔵 B. class Child(Parent):
• 🟠 C. class Parent -> Child:
• 🔴 D. class Parent(Child):

Q4. What is the output of the following code?

class Parent:
    def __init__(self):
        print("Parent constructor")

class Child(Parent):
    def __init__(self):
        print("Child constructor")

c = Child()

• 🟢 A. Parent constructor
• 🔵 B. Child constructor
• 🟠 C. Parent constructor Child constructor
• 🔴 D. Error

Q5. What is the primary purpose of inheritance in Python?

• 🟢 A. To improve memory efficiency
• 🔵 B. To hide implementation details
• 🟠 C. To enable code reusability
• 🔴 D. To reduce program complexity

Q6. Which syntax correctly defines a class `Child` inheriting from `Parent`?

• 🟢 A. {"class Child extends Parent"=>nil}
• 🔵 B. {"class Child(Parent)"=>nil}
• 🟠 C. {"class Child inherits Parent"=>nil}
• 🔴 D. {"class Child"=>"Parent"}

Q1. What is the output of the following Python code?

class Parent:
    def greet(self):
        print("Hello from Parent")

class Child(Parent):
    def greet(self):
        print("Hello from Child")
        Parent.greet(self)     
        super().greet()         

obj = Child()
obj.greet()

• 🟢 A. Hello from Child Hello from Parent Hello from Parent
• 🔵 B. Hello from Parent Hello from Child Hello from Parent
• 🟠 C. Hello from Child Hello from Child Hello from Parent
• 🔴 D. Hello from Parent Hello from Parent Hello from Child

Q2. What is the output of the following code?

class Parent:
    def show(self):
        print("Parent")

class Child(Parent):
    def show(self):
        print("Child")

obj = Child()
obj.show()

• 🟢 A. Parent
• 🔵 B. Child
• 🟠 C. Parent Child
• 🔴 D. Error

Q3. What is the output of the following code?

class Parent:
    def greet(self):
        print("Hello from Parent!")

class Child(Parent):
    def greet(self):
        print("Hello from Child!")

obj = Child()
obj.greet()

• 🟢 A. Hello from Parent!
• 🔵 B. Hello from Child!
• 🟠 C. Error
• 🔴 D. No output

Q4. What does the `super()` function do?

• 🟢 A. Returns the base class instance
• 🔵 B. Calls a method from a sibling class
• 🟠 C. Calls a method from the parent class
• 🔴 D. Creates a new subclass

Q5. In multiple inheritance, the method resolution order (MRO) follows:

• 🟢 A. Depth-first search
• 🔵 B. Breadth-first search
• 🟠 C. C3 linearization
• 🔴 D. Random order

Q6. What does `isinstance(child_obj, Parent)` return?

• 🟢 A. true
• 🔵 B. false
• 🟠 C. TypeError
• 🔴 D. None

Q1. Which type of inheritance is NOT supported in Python?

• 🟢 A. Single
• 🔵 B. Multiple
• 🟠 C. Cascading
• 🔴 D. Multilevel

Q2. How do you explicitly call a parent class method from a child class?

• 🟢 A. Parent.method(self)
• 🔵 B. self.parent_method()
• 🟠 C. super().method()
• 🔴 D. Both A and C

Q3. Which statement about private members (e.g., `__var`) in inheritance is true?

• 🟢 A. They are directly accessible in subclasses
• 🔵 B. They are inaccessible due to name mangling
• 🟠 C. They can be accessed using `super()`
• 🔴 D. They are inherited without name mangling

Q4. Hybrid inheritance refers to:

• 🟢 A. Combining multiple types of inheritance
• 🔵 B. Inheriting from two parent classes
• 🟠 C. Overriding all parent methods
• 🔴 D. Using interfaces only