Quiz on Encapsulation in Object-Oriented Programming

Which principle in object-oriented programming involves bundling data and methods that operate on that data into a single unit and restricting direct access to some components from the outside world?

• A. Inheritance

• B. Polymorphism

• C. Encapsulation

• D. Abstraction

What is the main purpose of encapsulation in object-oriented programming?

• A. To allow unrestricted access to all data

• B. To bundle data and methods together and control access to them

• C. To make data public for all classes

• D. To increase code complexity

How can encapsulation be described in terms of data security within objects?

• A. It exposes all data to the outside world

• B. It hides data and methods, providing access control

• C. It removes all access restrictions

• D. It separates data and methods completely

What does the term "data hiding" refer to in the context of encapsulation?

• Preventing external code from directly modifying an object's internal state

• Making all data public for easy access

• Encrypting data for security

• Storing data in a database

In Python, which naming convention is used for protected members?

• name

• _name

• __name

• name_

Which access modifier in Python is accessible from the class and its subclasses, but not everywhere?

• Public

• Protected

• Private

• Internal

What does Python rely on for access control instead of strict enforcement?

• Compiler checks

• Developer discipline and naming conventions

• Built-in access modifiers

• Runtime exceptions

When name mangling occurs in Python, how is the attribute name changed internally?

• __attr becomes _ClassName__attr

• __attr becomes __ClassName_attr

• __attr becomes attr_ClassName__

• __attr becomes ClassName_attr__

If you want to ensure that the balance attribute in BankAccount cannot be accessed directly from outside the class, which naming convention should you use?

• Use a single underscore before the attribute name

• Use double underscores before the attribute name

• Use no underscores before the attribute name

• Use triple underscores before the attribute name

What happens if you try to deposit a negative amount using the deposit method?

• A message "Deposit amount must be positive." is printed

• The balance decreases by the negative amount

• The balance remains unchanged and no message is printed

• An exception is raised