CPP Object-Oriented Programming Concepts

Question 1

Which OOP principle allows a subclass to provide a specific implementation of a method already defined in its superclass?

Accepted Answer

Polymorphism

Answer

Encapsulation

Answer

Abstraction

Answer

Inheritance

Question 2

What does the 'encapsulation' principle primarily aim to achieve in OOP?

Accepted Answer

Hiding internal state and requiring all interaction through methods

Answer

Code reuse via inheritance

Answer

Allowing multiple classes to share one interface

Answer

Enabling runtime method resolution

Question 3

In object-oriented design, what is an abstract class?

Accepted Answer

A class that cannot be instantiated and may contain abstract methods

Answer

A class with no methods

Answer

A class that inherits from multiple parents

Answer

A class whose attributes are all private

Question 4

Which concept describes a class implementing more than one interface in Java or C#?

Accepted Answer

Multiple interface implementation

Answer

Multiple inheritance

Answer

Interface segregation

Answer

Composition

Question 5

What is the difference between method overloading and method overriding?

Accepted Answer

Overloading defines multiple methods with the same name but different signatures; overriding redefines a superclass method in a subclass

Answer

Overloading changes return type; overriding changes parameter types

Answer

Overloading only works with constructors; overriding works with all methods

Answer

Overloading is compile-time; overriding is always static

Question 6

What is the 'Liskov Substitution Principle' (LSP)?

Accepted Answer

Subclasses should be replaceable for their base classes without altering program correctness

Answer

Every class should have only one reason to change

Answer

High-level modules should not depend on low-level modules

Answer

Clients should not be forced to depend on interfaces they do not use