Object Oriented Programming

Question 1

Define object-oriented programming.

Answer 1

A programming paradigm based on the concept of objects, which can contain data and code.

Question 2

What is an object in OOP?

Answer 2

An instance of a class that contains attributes and methods.

Question 3

True or false: Encapsulation hides the internal state of an object.

Answer 3

TRUE

Encapsulation restricts direct access to some of an object’s components.

Question 4

Fill in the blank: Inheritance allows a class to _______ properties of another class.

Answer 4

inherit

Question 5

What is a class in OOP?

Answer 5

A blueprint for creating objects, defining attributes and methods.

Question 6

Define polymorphism.

Answer 6

The ability to present the same interface for different data types.

Question 7

What does the self keyword represent in Python?

Answer 7

It refers to the instance of the class in method definitions.

Question 8

True or false: A class can have multiple constructors in Python.

Answer 8

FALSE

Python does not support method overloading, including constructors.

Question 9

What is the purpose of the __init__ method?

Answer 9

To initialize an object’s attributes when it is created.

Question 10

Fill in the blank: A method is a function defined within a _______.

Answer 10

class

Question 11

What is abstraction in OOP?

Answer 11

The concept of hiding complex implementation details and showing only essential features.

Question 12

Define class variable.

Answer 12

A variable that is shared among all instances of a class.

Question 13

What is a module in Python?

Answer 13

A file containing Python code that can define functions, classes, and variables.

Question 14

True or false: Composition is a way to achieve code reuse by including objects in other objects.

Answer 14

TRUE

Composition allows building complex types by combining simpler ones.

Question 15

What does super() do in Python?

Answer 15

It allows access to methods from a parent class.

Question 16

Fill in the blank: A getter method retrieves the value of a _______.

Answer 16

property

Question 17

What is the purpose of a setter method?

Answer 17

To set or update the value of a property in a class.

Question 18

Define abstract class.

Answer 18

A class that cannot be instantiated and is meant to be subclassed.

Question 19

What is method overriding?

Answer 19

When a subclass provides a specific implementation of a method already defined in its superclass.

Question 20

True or false: An interface defines methods without implementing them.

Answer 20

TRUE

Interfaces are used to enforce certain functionalities in classes.

Question 21

What is a constructor?

Answer 21

A special method that is called when an object is instantiated.

Question 22

Fill in the blank: Duck typing in Python means that the type of an object is determined by its _______.

Answer 22

behavior

Question 23

What is the significance of __str__ method?

Answer 23

It defines a string representation of an object for printing.

Question 24

Define instance variable.

Answer 24

A variable that is unique to each instance of a class.

Question 25

What does **isinstance()** function do?

Answer 25

Checks if an object is an instance of a specified class or a subclass.

Question 26

True or false: **Static methods** can access class and instance variables.

Answer 26

FALSE ## Footnote Static methods do not have access to the instance or class variables.

Question 27

What is the purpose of **__repr__** method?

Answer 27

To provide an unambiguous string representation of an object for debugging.

Question 28

Fill in the blank: **Multiple inheritance** allows a class to inherit from _______ classes.

Answer 28

multiple

Question 29

What is a **property** in Python?

Answer 29

A special kind of attribute that allows for getter and setter methods.

Question 30

Define **mixins**.

Answer 30

Classes that provide methods to other classes through inheritance, but are not meant to stand alone.

Question 31

What does **__del__** method do?

Answer 31

It defines behavior for when an object is about to be destroyed.

Question 32

True or false: **Encapsulation** promotes loose coupling in OOP.

Answer 32

TRUE ## Footnote Loose coupling allows for easier maintenance and flexibility.

Question 33

What is **dynamic typing** in Python?

Answer 33

The type of a variable is determined at runtime, not in advance.

Question 34

Fill in the blank: **Delegation** is when an object relies on another object to _______ a task.

Answer 34

perform