AMCAT Object-Oriented Programming Concepts

Question 1

Which OOP principle bundles data and methods that operate on that data within a single unit, restricting direct access from outside?

Accepted Answer

Encapsulation

Answer

Inheritance

Answer

Polymorphism

Answer

Abstraction

Question 2

When a child class acquires the properties and behaviors of a parent class, this OOP concept is called:

Accepted Answer

Inheritance

Answer

Polymorphism

Answer

Encapsulation

Answer

Abstraction

Question 3

Which of the following best describes polymorphism in OOP?

Accepted Answer

The same interface can be used for different underlying data types

Answer

A class can have only one constructor

Answer

A class cannot be instantiated

Answer

All methods must be overridden

Question 4

What is an abstract class in object-oriented programming?

Accepted Answer

A class that cannot be instantiated and may contain abstract methods

Answer

A class with no attributes

Answer

A class that can be directly instantiated

Answer

A class that inherits from multiple classes

Question 5

Which of the following correctly distinguishes a class from an object?

Accepted Answer

A class is a blueprint; an object is an instance of that class

Answer

An object is a blueprint; a class is an instance

Answer

Classes and objects are the same thing

Answer

An object can exist without a class

Question 6

Method overloading allows a class to define multiple methods with the same name but different:

Accepted Answer

Parameter lists (number or type of parameters)

Answer

Return types only

Answer

Access modifiers only

Answer

Bodies only

Question 7

In OOP, an interface is best described as:

Accepted Answer

A contract specifying method signatures that implementing classes must define

Answer

A class that has only private methods

Answer

A class that stores only static data

Answer

A mechanism to restrict inheritance