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

Q1. What is the main purpose of inheritance in Python?

1. To create multiple objects of a class
2. To reuse code and extend functionality
3. To define private methods in a class
4. To create a new programming paradigm

Q2. Which of the following is the correct syntax for inheritance in Python?

1. class Child inherits Parent:
2. class Child(Parent):
3. class Parent -> Child:
4. class Parent(Child):

Q3. What is the output of the following code?

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

class Dog(Animal):
    pass

d = Dog()
d.speak()

1. Animal speaks
2. Dog speaks
3. Error: **speak()** not defined
4. Nothing

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()

1. Parent constructor
2. Child constructor
3. Parent constructor Child constructor
4. Error

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

1. To improve memory efficiency
2. To hide implementation details
3. To enable code reusability
4. To reduce program complexity

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

1. {"class Child extends Parent"=>nil}
2. {"class Child(Parent)"=>nil}
3. {"class Child inherits Parent"=>nil}
4. {"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()

1. Hello from Child Hello from Parent Hello from Parent
2. Hello from Parent Hello from Child Hello from Parent
3. Hello from Child Hello from Child Hello from Parent
4. 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()

1. Parent
2. Child
3. Parent Child
4. 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()

1. Hello from Parent!
2. Hello from Child!
3. Error
4. No output

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

1. Returns the base class instance
2. Calls a method from a sibling class
3. Calls a method from the parent class
4. Creates a new subclass

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

1. Depth-first search
2. Breadth-first search
3. C3 linearization
4. Random order

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

1. true
2. false
3. TypeError
4. None

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

1. Single
2. Multiple
3. Cascading
4. Multilevel

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

1. Parent.method(self)
2. self.parent_method()
3. super().method()
4. Both A and C

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

1. They are directly accessible in subclasses
2. They are inaccessible due to name mangling
3. They can be accessed using `super()`
4. They are inherited without name mangling

Q4. Hybrid inheritance refers to:

1. Combining multiple types of inheritance
2. Inheriting from two parent classes
3. Overriding all parent methods
4. Using interfaces only