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Best Python OOPS MCQ for Competitive Programming
Quick Quiz
Which keyword is used to declare a class in Python?
a. class
b. object
c. def
d. instance
Option a – class
Which special method is automatically invoked when a new object of a class is created?
a. __init__
b. __main__
c. __class__
d. __new__
Option a – __init__
What is the role of the __init__ method in a Python class?
a. To create an object
b. To set up the object’s initial attributes
c. To declare the methods of the object
d. To remove the object
Option b – To set up the object’s initial attributes
Which statement about inheritance in Python is correct?
a. A class can inherit from multiple classes.
b. A class can inherit from a class and an interface.
c. A class can inherit from another class but not from an interface.
d. Python does not support inheritance.
Option a – A class can inherit from multiple classes.
Which keyword is used to indicate inheritance from a parent class in Python?
a. inherit
b. extends
c. inherit_from
d. None of these
Option b – extends
What does method overriding mean in Python?
a. Modifying a method’s behavior in a subclass by redefining it
b. Changing the method name in a subclass
c. Adding a completely new method to the subclass
d. Removing a method from the subclass
Option a – Modifying a method’s behavior in a subclass by redefining it
Which of the following best illustrates encapsulation in Python?
a. Organizing related attributes and methods within a class
b. Deriving new class features from a parent class
c. Changing the implementation of a method in a subclass
d. Accessing private attributes directly
Option a – Organizing related attributes and methods within a class
What does the self parameter represent in class methods?
a. The class itself
b. The parent class
c. The current instance of the class
d. The subclass
Option c – The current instance of the class
Which access modifier in Python allows attributes and methods to be accessed from any part of the program?
a. private
b. protected
c. public
d. global
Option c – public
Which access modifier in Python restricts access to attributes and methods to the class itself and its subclasses?
a. private
b. protected
c. public
d. global
Option b – protected
What is method overloading in Python?
a. Defining multiple methods with the same name but different parameters
b. Defining multiple methods with the same name and same parameters
c. Defining methods with different names but same parameters
d. Defining methods with the same name but different return types
Option a – Defining multiple methods with the same name but different parameters
What is a key benefit of using object-oriented programming?
a. Code reusability
b. Increased execution speed
c. Smaller code size
d. Simpler syntax
Option a – Code reusability
In object-oriented programming, what is the process of creating an object called?
a. Instantiating
b. Initializing
c. Constructing
d. Engendering
Option a – Instantiating
What role does the @staticmethod decorator serve in Python?
a. Marks a method that does not require access to instance or class data.
b. Marks a method as abstract and needing implementation in subclasses.
c. Marks a method that operates on the class rather than an instance.
d. Marks a method that is called on an instance of the class.
Option a – Marks a method that does not require access to instance or class data.
How would you describe an abstract class in Python?
a. A class designed to be a blueprint and cannot be instantiated directly.
b. A class consisting only of abstract methods without implementation.
c. A class defined inside another class.
d. A class that inherits features from several classes simultaneously.
Option a – A class designed to be a blueprint and cannot be instantiated directly.
What is the purpose of the isinstance() function in Python?
a. To verify whether an object belongs to a certain class or subclass.
b. To check if two objects have the same value.
c. To convert a string type to an integer type.
d. To retrieve attributes associated with a class.
Option a – To verify whether an object belongs to a certain class or subclass.
What does the repr method do in Python?
a. Returns a string that provides a clear representation of an object, useful for debugging.
b. Converts a string back into an object.
c. Compares two objects to check if they are equal.
d. Creates a verbose, detailed string to represent an object.
Option d – Creates a verbose, detailed string to represent an object.
Which approach can stop other classes from creating instances of a particular class?
a. Making the init method inaccessible outside the class.
b. Applying the @abstractmethod decorator to the class.
c. Making the new method private to control instance creation.
d. Using the @staticmethod decorator to prevent instantiation.
Option c – Making the new method private to control instance creation.
What does the @classmethod decorator indicate in Python?
a. The method receives the class as the first argument instead of the instance.
b. The method is abstract and requires overriding in subclasses.
c. The method operates on an instance of the class.
d. The method is static and doesn’t use the class or instance reference.
Option a – The method receives the class as the first argument instead of the instance.
What is meant by dynamic binding in Python?
a. Associating method calls with their correct implementations during program execution.
b. Resolving variable values during the compilation phase.
c. Linking classes to their parent classes when the program starts.
d. Connecting imported modules to the code during compilation.
Option a – Associating method calls with their correct implementations during program execution.
How might you access a private attribute within a Python class?
a. Directly using the attribute name with the dot operator.
b. By applying the name mangling convention that modifies the attribute’s name.
c. Using a special @private decorator to expose the attribute.
d. Applying an @access modifier to control attribute visibility.
Option b – By applying the name mangling convention that modifies the attribute’s name.
What is the function of the @property decorator in Python?
a. To declare a class attribute as private.
b. To mark an attribute as belonging to the class rather than instances.
c. To specify a method as static within the class.
d. To create a method that behaves like a getter for a class attribute.
Option d – To create a method that behaves like a getter for a class attribute.
What does the @abstractmethod decorator do?
a. Marks an attribute as private within a class.
b. Declares a class attribute accessible to all instances.
c. Declares a method that must be implemented by subclasses.
d. Specifies that a method is static within the class.
Option c – Declares a method that must be implemented by subclasses.
What is duck typing in Python?
a. Using duck objects as a metaphor in programming.
b. Typing variables dynamically without enforcing explicit types.
c. Applying principles of object-oriented programming.
d. Emphasizing what an object can do over what it actually is.
Option d – Emphasizing what an object can do over what it actually is.
When two objects of a class are compared using the == operator, which method is invoked?
a. main
b. __init__
c. class
d. __eq__
Option d – __eq__
What role does the @classmethod decorator serve in Python?
a. It designates a method as a class method.
b. It marks a method as abstract.
c. It declares a method as static.
d. It indicates an instance method.
Option a – It designates a method as a class method.
In Python class methods, what does the self parameter represent?
a. The class itself
b. The parent class
c. The current instance of the class
d. The derived class
Option c – The current instance of the class
How is operator overloading defined in Python?
a. Modifying how operators behave for user-defined classes
b. Replacing all operators inside a class
c. Introducing new operators not originally in Python
d. Designing custom operators for particular tasks
Option a – Modifying how operators behave for user-defined classes
What is the function of the repr method in Python?
a. Producing a string representation of an object
b. Converting a string into an object
c. Comparing two objects for equality
d. Creating a detailed string output for an object
Option d – Creating a detailed string output for an object
Which keyword allows access to a class’s own attributes and methods inside the class?
a. self
b. super
c. this
d. access
Option a – self
How is the method resolution order (MRO) defined in Python?
a. The sequence in which methods are executed
b. The order in which methods are written in the class
c. The sequence in which base classes are searched during inheritance
d. The order classes appear in the source code
Option c – The sequence in which base classes are searched during inheritance
What does duck typing mean in Python?
a. Using actual ducks as objects in code
b. Dynamically assigning types to variables
c. Employing object-oriented programming principles
d. Relying on an object’s behavior instead of its explicit type
Option d – Relying on an object’s behavior instead of its explicit type
What is meant by composition in object-oriented programming?
a. Building objects that contain other objects
b. Creating objects based on a template
c. Defining objects with preset attributes
d. Establishing inheritance relationships between objects
Option a – Building objects that contain other objects
How would you describe an abstract class in Python?
a. A class designed to be a base and not directly instantiated
b. A class that only contains abstract methods
c. A class nested within another class
d. A class capable of inheriting from multiple classes
Option a – A class designed to be a base and not directly instantiated
What does the __str__ method do in a Python class?
a. Produces a string that represents the object
b. Defines the data type for strings
c. Instantiates a new object of the class
d. None of these
Option a – Produces a string that represents the object
What function does the @classmethod decorator serve in Python?
a. It declares a method as belonging to the class
b. It creates an instance of a class
c. It makes a method private
d. None of these
Option a – It declares a method as belonging to the class
What is meant by Duck Typing in Python’s object-oriented programming?
a. Using classes that specifically model ducks
b. Emphasizing an object’s behavior over its actual type
c. A form of polymorphism that applies only to ducks
d. None of these
Option b – Emphasizing an object’s behavior over its actual type
How do you define a static method within a Python class?
a. By applying the @staticmethod decorator
b. By using the keyword static
c. By defining the method without any special decorator or keyword
d. None of these
Option a – By applying the @staticmethod decorator
How would you describe an abstract class in Python?
a. A class designed not to be instantiated directly
b. A class containing only abstract methods
c. A class that does not contain any methods
d. None of these
Option b – A class containing only abstract methods
Which keyword is used to declare a subclass in Python?
a. child
b. subclass
c. extends
d. None of these
Option d – None of these
What is the role of the __init__ method in Python classes?
a. To set up initial values when an object is created
b. To instantiate a new object
c. To declare class-level methods
d. None of these
Option a – To set up initial values when an object is created
What does the __doc__ attribute represent in a Python class?
a. The documentation string describing the class
b. A reference to the class itself
c. Used to declare class methods
d. None of these
Option a – The documentation string describing the class
How is multiple inheritance handled in Python?
a. Using the extends keyword
b. Allowing a class to inherit from multiple parent classes
c. Using the implements keyword
d. None of these
Option b – Allowing a class to inherit from multiple parent classes
What is a mixin class in Python?
a. A form of polymorphism
b. A special method inside a class
c. A class intended to provide reusable methods to other classes
d. None of these
Option c – A class intended to provide reusable methods to other classes
What is the purpose of the @property decorator in Python?
a. To define a method as a property attribute of the class
b. To make a method private
c. To turn a method into a static method
d. None of these
Option a – To define a method as a property attribute of the class
How can method overloading be accomplished in Python?
a. By creating multiple methods with the same name but different parameters
b. By using the @overload decorator
c. By redefining the method inside a subclass
d. None of these
Option a – By creating multiple methods with the same name but different parameters
What happens when both __init__ and __new__ are defined in a Python class?
a. A syntax error will occur
b. The __new__ method executes before __init__ and can override its behavior
c. The __init__ method is executed instead of __new__
d. Both methods are executed, with __new__ running first
Option b – The __new__ method executes before __init__ and can override its behavior
Is it possible to define more than one constructor in a Python class?
a. Yes, by overloading the __init__ method with multiple parameter sets
b. Yes, by defining different versions of the __new__ method
c. No, Python classes support only a single constructor
d. None of the listed options
Option c – No, Python classes support only a single constructor
What role does the __call__ method serve in a Python class?
a. It generates a new class instance
b. It allows objects to be called like functions
c. It sets up initial values for object properties
d. It serves no specific function
Option b – It allows objects to be called like functions
How can a default value be assigned to a constructor parameter in Python?
a. Using the default keyword
b. By directly assigning the value within the function’s parameter list
c. Through the use of a method like set_default
d. There’s no way to do this
Option b – By directly assigning the value within the function’s parameter list
What is the main use of a destructor in Python?
a. It handles cleanup when an object is deleted
b. It initializes object variables
c. It defines behaviors for object methods
d. It doesn’t have a clear use
Option a – It handles cleanup when an object is deleted
Which method is invoked just before an object is destroyed in Python?
a. __delete__
b. destroy__
c. __del__
d. None of these
Option c – __del__
What does the __new__ method do in Python?
a. It constructs and returns a new instance of a class
b. It sets initial values for the class
c. It is used to define methods inside a class
d. None of these
Option a – It constructs and returns a new instance of a class
Is a constructor necessary in every Python class?
a. No, a constructor is not required
b. Yes, each class must define a constructor
c. Only if the class contains variables
d. None of the above
Option a – No, a constructor is not required
What does the __init_subclass__ method do?
a. It initializes a subclass after creation
b. It acts as a constructor for a subclass
c. It allows customization when a class is subclassed
d. It has no particular use
Option c – It allows customization when a class is subclassed
How can you stop a class from being instantiated in Python?
a. Declare the class as abstract
b. Apply the @abstract decorator
c. Raise an error inside the constructor
d. You cannot prevent instantiation
Option a – Declare the class as abstract
Why would you use the __str__ method in a class?
a. To set up instance variables
b. To instantiate a class object
c. To return a human-readable string version of an object
d. It has no purpose
Option c – To return a human-readable string version of an object
Which command is used to create an object from a class?
a. create
b. instance
c. new
d. None of these
Option d – None of these
How can you ensure that a constructor argument is required in Python?
a. Assign it a default value
b. Use a keyword like mandatory
c. Leave out the default value when defining the parameter
d. There is no way to enforce that
Option c – Leave out the default value when defining the parameter
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