OOP Concepts Quiz

Which OOP characteristic is exemplified by a BankAccount class hiding its balance attribute?

• Inheritance

• Polymorphism

• Encapsulation

• Abstraction

What is the primary purpose of the Singleton Pattern?

• To allow a class to inherit from another class

• To ensure only one instance of a class exists

• To bridge between incompatible interfaces

• To define workflows or algorithms

In an OOP context, what does the Adapter Pattern do?

• Ensures only one instance of a class exists

• Acts as a bridge between incompatible interfaces

• Allows methods to perform differently based on input context

• Focuses on object creation mechanisms

Which pattern allows multiple objects to listen and react to changes in a subject?

• Singleton Pattern

• Adapter Pattern

• Observer Pattern

• Creational Pattern

How does inheritance promote code reuse in OOP?

• By creating multiple instances of a class

• By allowing a new class to use the properties and methods of an existing class

• By defining a class with no methods

• By using interfaces to define methods

What is an instantiation of a class called in OOP?

• Method

• Object

• Attribute

• Pattern

Which of the following is an example of polymorphism?

• Hiding complex implementation details

• A class deriving from another class

• Methods performing differently based on the object

• Creating reusable code through standard structures

What does encapsulation achieve in OOP?

• It allows methods to perform differently based on the object

• It bundles data and behaviours in a class, restricting direct access

• It enables a class to derive from another class

• It provides a simplified interface while hiding complex details

Which OOP characteristic is demonstrated by a TV class exposing methods like turnOn() and changeChannel() but hiding the internal workings?

• Inheritance

• Polymorphism

• Encapsulation

In a banking system, which feature ensures that all accounts can reuse the same logic for methods like deposit() and withdraw()?

• A. Inheritance

• B. Encapsulation

• C. Polymorphism

• D. Reusability through Classes and Objects