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Python OOP MCQ for Competitive Programming
In Python, how is the method lookup sequence determined when using multiple inheritance?
a. Method Resolution Order
b. Inheritance Order
c. Call Order
d. None of the above
Option a – Method Resolution Order
What is the primary use of the isinstance() function in Python?
a. To verify if an object is created from a specific class
b. To verify if one class inherits from another
c. To identify if a method has been redefined
d. None of the above
Option a – To verify if an object is created from a specific class
What does the “diamond problem” refer to in Python’s multiple inheritance?
a. A naming clash between methods from different parent classes
b. A conflict caused when a class inherits from two classes that share a common ancestor
c. A bug in the diamond() function
d. None of the above
Option b – A conflict caused when a class inherits from two classes that share a common ancestor
Why is the @abstractmethod decorator used in Python?
a. To make a method private
b. To designate a method as abstract within an abstract base class
c. To generate a new instance of a class
d. None of the above
Option b – To designate a method as abstract within an abstract base class
Which statement best describes an abstract class in Python?
a. A class containing only implemented methods
b. A class that cannot be instantiated directly
c. A class having just one abstract method
d. None of the above
Option b – A class that cannot be instantiated directly
What function does the @staticmethod decorator serve in Python?
a. It restricts a method’s visibility
b. It indicates that the method belongs to the class, not instances
c. It initializes a class object
d. None of the above
Option b – It indicates that the method belongs to the class, not instances
What is a valid way to prevent a method from being overridden in Python?
a. Declaring the method as final
b. Applying the @final decorator
c. Using the @sealed decorator
d. None of the above
Option d – None of the above
Is it possible for a subclass in Python to have fewer attributes than its parent class?
a. Yes, always
b. No, not possible
c. Yes, but only if the parent class is abstract
d. None of the above
Option a – Yes, always
What does the __bases__ attribute reveal in a Python class?
a. It shows the parent classes of the current class
b. It accesses methods from the base class
c. It identifies whether a class is abstract
d. None of the above
Option a – It shows the parent classes of the current class
What are common methods of achieving encapsulation in Python?
a. By using public, protected, and private access modifiers
b. Through naming conventions like underscores
c. Using a decorator to restrict access
d. All of the above
Option d – All of the above
What role does the issubclass() function play in Python?
a. It checks whether an object is an instance of a class
b. It checks whether one class is derived from another
c. It verifies whether a method is derived from another
d. None of the above
Option b – It checks whether one class is derived from another
What defines a class method in Python?
a. A function that is only invoked on objects of the class
b. A function declared inside a class
c. A function that operates on the class itself instead of its instances
d. A function that can only be used with abstract classes
Option c – A function that operates on the class itself instead of its instances
Which decorator is used to define a class method in Python?
a. @classmethod
b. @staticmethod
c. @instance
d. None of these
Option a – @classmethod
What is the conventional name for the first parameter of a class method in Python?
a. self
b. cls
c. this
d. class
Option b – cls
What elements can a class method access within Python?
a. Instance-specific variables only
b. Other class methods only
c. Both class-level variables and instance variables
d. Private variables only
Option c – Both class-level variables and instance variables
How do you invoke a class method in Python?
a. Using ClassName.method()
b. Using self.method()
c. Using cls.method()
d. Calling method() directly
Option c – Using cls.method()
What is the primary role of a class method in Python?
a. To instantiate new objects
b. To manipulate class variables
c. To define private helper methods
d. None of these
Option b – To manipulate class variables
Is it possible for a class method to access instance variables directly?
a. Yes, always
b. No, not at all
c. Only if an instance is passed explicitly
d. Only if the instance is declared as part of the class
Option b – No, not at all
Can you call a class method on an instance of the class in Python?
a. Yes, in all cases
b. No, never
c. Only if specifically permitted
d. Only if the instance is created via the __new__ method
Option c – Only if specifically permitted
What is the common usage for class methods in Python?
a. Initializing attributes on instances
b. Manipulating data specific to individual instances
c. Managing class-level data or providing functionality related to the class itself
d. None of the above
Option c – Managing class-level data or providing functionality related to the class itself
How do class methods differ from static methods in Python?
a. Class methods can interact with instance data, static methods cannot
b. Static methods can access class variables, but class methods cannot
c. Class methods receive the class as a parameter, static methods do not
d. There is no difference between the two
Option c – Class methods receive the class as a parameter, static methods do not
Is it possible in Python for a child class to have multiple parent classes sharing the same name?
a. Yes, and it combines the attributes from all such parent classes.
b. No, Python does not permit multiple parent classes with identical names.
c. Only if those parent classes reside within the same module as the child class.
d. It depends on how the child class is implemented.
Option b – No, Python does not permit multiple parent classes with identical names.
What kind of inheritance occurs when a class derives from another class, which itself is derived from a third class?
a. Single inheritance
b. Multiple inheritance
c. Multilevel inheritance
d. Hybrid inheritance
Option c – Multilevel inheritance
Can a child class in Python inherit methods with identical names from multiple parent classes?
a. Yes, and it will invoke all methods sharing that name.
b. No, Python prevents multiple methods with the same name in the inheritance chain.
c. Only if the child class also acts as a parent class.
d. It depends on the child class’s specific implementation.
Option a – Yes, and it will invoke all methods sharing that name.
Which inheritance model is most frequently employed in Python’s OOP?
a. Single inheritance
b. Multiple inheritance
c. Multilevel inheritance
d. Hybrid inheritance
Option a – Single inheritance
In Python, can a child class inherit from multiple parent classes that have conflicting method definitions?
a. Yes, but this causes ambiguity errors.
b. No, conflicting method signatures are not allowed in an inheritance chain.
c. Only if the child class itself is also a parent class.
d. It varies based on the child class design and Python’s method resolution order.
Option d – It varies based on the child class design and Python’s method resolution order.
Which inheritance type allows a class to receive properties from multiple parents but excludes their methods?
a. Single inheritance
b. Multiple inheritance
c. Multilevel inheritance
d. Hybrid inheritance
Option b – Multiple inheritance
Can a child class inherit from a parent class located in a different Python module?
a. Yes, provided the module is properly imported.
b. No, inheritance across modules is unsupported in Python.
c. Only if the child class is defined in the same module as the parent.
d. It depends on how the modules and classes are structured.
Option a – Yes, provided the module is properly imported.
In OOP terms, what does instantiation refer to?
a. Removing an object of a class
b. Creating a new object of a class
c. Changing an existing object of a class
d. Duplicating an object of a class
Option b – Creating a new object of a class
Which special method is automatically invoked when an instance of a child class is created in Python?
a. __init__
b. __new__
c. _create
d. construct__
Option a – __init__
a. Single inheritance
b. Multiple inheritance
c. Multilevel inheritance
d. Hybrid inheritance
Option d – Hybrid inheritance
In Python, is it possible for a child class to override a method inherited from its parent without altering the method’s behavior?
a. Yes, by including the pass statement inside the child class method
b. No, overriding always requires changing the method’s functionality
c. Only if the child class also acts as a parent class
d. It depends on how the child class and method resolution are implemented
Option a – Yes, by including the pass statement inside the child class method
What keyword is used in Python to derive a class from a parent class?
a. inherits
b. inheriting
c. extend
d. super
Option c – extend
Can a child class in Python access private methods defined in its parent class?
a. Yes, child classes can inherit and use private methods
b. No, private methods are not accessible to child classes
c. Only if those methods are defined with protected access instead of private
d. It depends on the child class implementation and access control
Option b – No, private methods are not accessible to child classes
Which inheritance pattern involves a class inheriting from a parent, which itself inherits from another parent class?
a. Single inheritance
b. Multiple inheritance
c. Multilevel inheritance
d. Hybrid inheritance
Option b – Multiple inheritance
In Python, can a child class define a method with the same name as one in its parent class?
a. Yes, the child’s method will override the parent’s method
b. No, method names must be unique in a parent-child hierarchy
c. Only if the child class is also a parent class
d. It depends on the child class design and method resolution order
Option a – Yes, the child’s method will override the parent’s method
What type of inheritance describes a class inheriting from a parent, which in turn inherits from its own parent class?
a. Single inheritance
b. Multiple inheritance
c. Multilevel inheritance
d. Hybrid inheritance
Option c – Multilevel inheritance
Is it possible for a child class in Python to inherit attributes with different names from multiple parent classes?
a. Yes, child classes can inherit differently named attributes from various parents
b. No, Python does not support inheritance of attributes with different names
c. Only if the child class is also a parent class
d. It depends on the attribute resolution process and the child class setup
Option a – Yes, child classes can inherit differently named attributes from various parents
Which inheritance model involves a class inheriting from a parent class, which itself inherits from another parent?
a. Single inheritance
b. Multiple inheritance
c. Multilevel inheritance
d. Hybrid inheritance
Option c – Multilevel inheritance
If multiple parent classes have conflicting attribute names, how does Python handle inheritance in the child class?
a. Yes, but this causes ambiguity errors
b. No, Python prohibits such conflicts in inheritance chains
c. Only if the child class also serves as a parent class
d. It depends on the child class structure and Python’s attribute resolution order
Option d – It depends on the child class structure and Python’s attribute resolution order
Can a subclass in Python override a method inherited from its parent without modifying its behavior?
a. Yes, by defining the method with a pass statement inside the subclass.
b. No, Python requires the method’s behavior to change when overridden.
c. Only if the subclass is also acting as a parent class to another class.
d. It depends on how the subclass and method resolution order are implemented.
Option a – Yes, by defining the method with a pass statement inside the subclass.
How would you define polymorphism in Python?
a. The capability of an object to behave in different forms.
b. A specific data structure provided by Python.
c. A mechanism for handling errors in Python.
d. An algorithm used for sorting data in Python.
Option a – The capability of an object to behave in different forms.
Which keyword is typically involved in enabling polymorphism in Python?
a. polymorphism
b. var
c. def
d. None of these
Option d – None of these
What does method overriding mean in Python?
a. Providing a new version of a method in a subclass that exists in the parent class.
b. Redefining a variable in a subclass that was originally in the parent class.
c. A Python technique for handling exceptions.
d. A type of looping construct in Python.
Option a – Providing a new version of a method in a subclass that exists in the parent class.
Which one of the following is an example of polymorphism in Python?
a. Inheritance
b. Encapsulation
c. Defining multiple methods with the same name but different parameters (method overloading)
d. Redefining a method from the parent class in a subclass (method overriding)
Option d – Redefining a method from the parent class in a subclass (method overriding)
What is the usual way to implement polymorphism in Python?
a. Through inheritance combined with method overriding.
b. Using encapsulation alongside method overloading.
c. Employing control flow statements like loops and conditionals.
d. By using a specific polymorphism keyword in the language.
Option a – Through inheritance combined with method overriding.
Which statement best describes polymorphism in Python?
a. It enhances code reuse and simplifies maintenance.
b. It can only be realized using encapsulation.
c. It is unique to the Python programming language.
d. It is a type of Python data structure.
Option a – It enhances code reuse and simplifies maintenance.
What does method overloading refer to in Python?
a. Defining several methods with the same name but different argument lists.
b. Defining several methods with different names but identical arguments.
c. A strategy for catching errors in Python programs.
d. A kind of loop structure in Python.
Option a – Defining several methods with the same name but different argument lists.
In object-oriented programming, polymorphism is most closely associated with which concept?
a. Inheritance
b. Encapsulation
c. Abstraction
d. Composition
Option a – Inheritance
How does polymorphism improve flexibility in Python code?
a. It enables methods to be dynamically chosen at runtime.
b. It automatically manages exceptions and errors.
c. It accelerates the execution speed of code.
d. It limits the number of accessible methods and variables.
Option a – It enables methods to be dynamically chosen at runtime.
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