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Best Online Resources for Python OOP MCQ Practice
Quick Quiz
In what way can decorators help manage access control in Python?
a. They can limit usage of specific functions or classes by verifying user permissions.
b. They enhance a Python program’s security by adding extra protective layers.
c. They change how the Python interpreter functions internally.
d. They are not suitable for implementing access control in Python.
Option a – They can limit usage of specific functions or classes by verifying user permissions.
Which built-in function is commonly involved in creating decorators in Python?
a. decorate()
b. decorator()
c. functools()
d. functools.wraps()
Option c – functools()
What purpose does the functools.wraps() function serve within a decorator?
a. It adds new features to the decorated function or class.
b. It wraps the original function or class to apply the decorator’s behavior.
c. It maintains the original function or class’s metadata and documentation.
d. It removes the original function or class and replaces it with the decorator’s version.
Option c – It maintains the original function or class’s metadata and documentation.
Which of these is not typically an appropriate use case for decorators in Python?
a. Improving performance by caching results.
b. Checking input values and handling errors.
c. Tracking execution time and logging activity.
d. Altering the core syntax or behavior of the Python language itself.
Option d – Altering the core syntax or behavior of the Python language itself.
Is it possible to use decorators on methods within a class?
a. No, decorators only work with standalone functions.
b. Yes, decorators can be applied to both regular functions and methods inside classes.
c. Yes, but only if the method is marked as a static method.
d. No, Python does not support decorators on class methods.
Option b – Yes, decorators can be applied to both regular functions and methods inside classes.
When several decorators are stacked on a function, what is the sequence of their application?
a. Decorators are applied starting from the outermost to the innermost.
b. They are applied in no fixed sequence and can vary.
c. All decorators apply at the same time simultaneously.
d. They execute in the same order as they appear in the code (top to bottom).
Option a – Decorators are applied starting from the outermost to the innermost.
Can a decorator be removed from a function or class after it has been applied?
a. Yes, by redefining the function or class without the decorator.
b. No, once applied, decorators cannot be undone.
c. Yes, using a special @remove decorator syntax.
d. No, decorators permanently modify the function or class.
Option b – No, once applied, decorators cannot be undone.
Is it within a decorator’s capability to change the arguments passed to a function?
a. Yes, decorators can alter the input arguments before the function runs.
b. No, decorators cannot modify the arguments passed to functions.
c. Yes, but only for methods defined inside a class.
d. No, decorators are limited to changing only the function’s return value.
Option a – Yes, decorators can alter the input arguments before the function runs.
Identify the decorator that is not commonly used in Python.
a. @property
b. @staticmethod
c. @abstractmethod
d. @override
Option d – @override
Can decorators be implemented using classes as well as functions?
a. Yes, both classes and functions can be used to create decorators.
b. No, decorators must be functions exclusively.
c. Yes, but only if the class inherits from a specific decorator base class.
d. No, decorators are always class-based, not function-based.
Option a – Yes, both classes and functions can be used to create decorators.
What does object-oriented programming (OOP) involve?
a. Organizing code by creating and interacting with objects.
b. Focusing primarily on organizing data structures.
c. Writing software entirely through the use of functions.
d. Improving program efficiency by optimizing code speed.
Option a – Organizing code by creating and interacting with objects.
Which of the following is not a core concept of object-oriented programming?
a. Encapsulation
b. Inheritance
c. Polymorphism
d. Normalization
Option d – Normalization
How is a class defined in Python?
a. A collection of related functions.
b. A category or type of data.
c. An actual instance created from an object.
d. A blueprint that defines how objects are created.
Option d – A blueprint that defines how objects are created.
Which of the following best illustrates polymorphism in Python?
a. A function that can take arguments of various data types.
b. A class that derives from multiple parent classes.
c. A method declared in a base class and redefined in a subclass.
d. A variable that is accessible from anywhere within the program.
Option a – A function that can take arguments of various data types.
What is the main use of the super() function in Python?
a. To invoke the parent class’s initializer method.
b. To stop the execution of an object.
c. To create a static method inside a class.
d. To retrieve attributes from a subclass.
Option a – To invoke the parent class’s initializer method.
Which option represents a well-structured Python class?
a. A class containing numerous global variables and lengthy method names.
b. A class that has no attributes or functions.
c. A class that properly hides its data and exposes functionality through methods.
d. A class that has repeated attributes and inconsistent naming patterns.
Option c – A class that properly hides its data and exposes functionality through methods.
In object-oriented programming, what is meant by composition?
a. Building objects that contain other objects within them.
b. Designing objects using a predefined blueprint.
c. Instantiating objects with preset properties.
d. Creating objects by inheriting from another class.
Option a – Building objects that contain other objects within them.
How is operator overloading defined in Python?
a. Modifying the default behavior of operators for custom classes.
b. Replacing all operators in a class with new implementations.
c. Introducing new operators that do not exist in Python by default.
d. Developing entirely new operators for special purposes.
Option a – Modifying the default behavior of operators for custom classes.
Which keyword allows a class to refer to its own properties and methods?
a. self
b. super
c. this
d. access
Option a – self
What function does the __str__ method serve in Python?
a. To produce a human-readable string version of an object.
b. To transform a string into an object instance.
c. To convert a class definition into a string object.
d. To check if two objects are equivalent.
Option a – To produce a human-readable string version of an object.
What is the meaning of multiple inheritance in Python?
a. A single class acquiring attributes and methods from several parent classes.
b. A class inheriting only attributes from multiple classes.
c. A class inheriting only methods from multiple classes.
d. A class that inherits both from a class and an interface.
Option a – A single class acquiring attributes and methods from several parent classes.
What is the function of the del statement in Python?
a. To erase a class completely from the system.
b. To remove an attribute from an object.
c. To eliminate a method defined in a class.
d. To delete an entire hierarchy of classes.
Option b – To remove an attribute from an object.
How are exceptions typically managed in object-oriented programming?
a. By using try-except blocks within methods.
b. Through if-else logic inside classes.
c. By looping constructs that check for exceptions.
d. Automatically by the programming language compiler.
Option a – By using try-except blocks within methods.
Which one of these is a standard built-in Python exception?
a. InterfaceError
b. TypeError
c. UndefinedFunctionError
d. ProgramError
Option b – TypeError
What does method resolution order (MRO) in Python determine?
a. The sequence in which methods are executed within a class.
b. The sequence in which methods are declared inside a class.
c. The hierarchy order in which classes are searched during multiple inheritance.
d. The order in which classes appear in a Python program.
Option c – The hierarchy order in which classes are searched during multiple inheritance.
How can you instantiate an object from a Python class?
a. By invoking the class name like a function.
b. By calling a method named new().
c. By explicitly calling a method named new.
d. By using a method called allocate().
Option a – By invoking the class name like a function.
What role does the @classmethod decorator serve in Python?
a. It marks a method as belonging to the class rather than an instance.
b. It defines a method as abstract within the class.
c. It designates a method as an instance method.
d. It defines a static method inside a class.
Option a – It marks a method as belonging to the class rather than an instance.
How do class variables differ from instance variables in Python?
a. Class variables are shared across all instances, while instance variables are unique to each object.
b. Class variables are unique per object, while instance variables are common to all instances.
c. Class variables are declared outside methods, instance variables outside classes.
d. Class variables use dot notation on the class, instance variables use self.
Option a – Class variables are shared across all instances, while instance variables are unique to each object.
What is the correct way to modify a class variable’s value in Python?
a. Use the self keyword inside an instance.
b. Use the @classmethod decorator.
c. Directly access and assign it through the class name with dot notation.
d. Apply the @staticmethod decorator.
Option c – Directly access and assign it through the class name with dot notation.
In object-oriented programming, what is the function of a constructor?
a. It creates new objects.
b. It initializes new objects with default or given values.
c. It deletes objects when no longer needed.
d. It provides access to an object’s attributes.
Option b – It initializes new objects with default or given values.
How can you specify a default value for a method parameter in Python?
a. By using the self parameter.
b. By assigning a default value in the method’s parameter list.
c. By marking the method with the @staticmethod decorator.
d. By accepting arbitrary arguments with *args.
Option b – By assigning a default value in the method’s parameter list.
What is the purpose of the @staticmethod decorator in Python?
a. To declare a method that does not access instance or class data.
b. To declare an abstract method.
c. To declare an instance method.
d. To declare a method bound to the class.
Option a – To declare a method that does not access instance or class data.
What does the __name__ attribute typically represent in Python?
a. The identifier of the current module.
b. The name of a class.
c. The name of a method.
d. The name of an instance.
Option a – The identifier of the current module.
Which special method is triggered when converting an object to a string using str()?
a. __str__
b. __init__
c. __main__
d. __class__
Option a – __str__
How would you define a decorator in Python?
a. A callable that enhances or modifies the behavior of functions or classes.
b. A method used for validating input data.
c. A class that overrides built-in functions.
d. A reserved word used to declare classes.
Option a – A callable that enhances or modifies the behavior of functions or classes.
What kind of approach do Object-Oriented languages typically use when executing a program?
a. Top-down approach
b. Bottom-up approach
c. A combination of top-down and bottom-up approaches
d. None of these
Option b – Bottom-up approach
How can you set a default value for a parameter in a Python method?
a. By using the self keyword
b. By assigning a default value in the method’s parameter list
c. By applying the @staticmethod decorator
d. By using the *args argument
Option b – By assigning a default value in the method’s parameter list
What is the main goal of encapsulation in Python’s object-oriented programming?
a. To make the code modular
b. To control access to the attributes of a class
c. To promote reuse of code
d. All of these
Option b – To control access to the attributes of a class
Which keyword is used to create a new object from a class in Python?
a. instance
b. new
c. create
d. None of these
Option d – None of these
What does the super() function do in Python’s OOP?
a. Calls a method from a parent (super) class
b. Instantiates a new object
c. Accesses private variables
d. None of these
Option a – Calls a method from a parent (super) class
Which statement accurately describes inheritance in Python?
a. A class can inherit from multiple parent classes
b. Python only allows single inheritance
c. Python does not support inheritance
d. None of these
Option a – A class can inherit from multiple parent classes
What role does the __init__ method serve in a Python class?
a. Initializes the attributes of the class
b. Creates an instance of the class
c. Defines the class’s methods
d. None of these
Option a – Initializes the attributes of the class
Why is the self parameter used in methods of a Python class?
a. It refers to the class itself
b. It refers to the specific instance of the class
c. It creates new instances of the class
d. None of these
Option b – It refers to the specific instance of the class
How is a private attribute denoted in Python classes?
a. Using the keyword private
b. Using the keyword secret
c. Using a name with a leading double underscore (__)
d. None of these
Option d – None of these
How would you describe polymorphism in Python’s OOP?
a. The ability of a class to inherit from multiple classes
b. The ability for objects of different types to be treated as instances of the same class
c. The ability to hide the inner workings of a class
d. None of these
Option b – The ability for objects of different types to be treated as instances of the same class
Which built-in function can verify whether an object belongs to a specific class?
a. object_instance()
b. isinstance()
c. typeof()
d. None of these
Option b – isinstance()
What is the common way to implement method overriding in Python?
a. Using an @override decorator
b. Redefining the method in the child class
c. Calling the super() function
d. None of these
Option b – Redefining the method in the child class
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