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

Encapsulation wraps data (attributes) and behavior (methods) together in a class and controls access through access modifiers like private, protected, and public.

Question 2

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

Accepted Answer

Inheritance

Answer

Inheritance allows a derived (child) class to reuse the fields and methods of a base (parent) class, promoting code reuse.

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

Polymorphism means 'many forms' — the same method name or interface can behave differently depending on the object it operates on.

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

An abstract class serves as a blueprint for other classes; it cannot be instantiated on its own and may define abstract methods that subclasses must implement.

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

A class defines the structure and behavior (blueprint), while an object is a concrete instance created from that class at runtime.

AMCAT Practice Test

AMCAT Practice Test

AMCAT Object-Oriented Programming Concepts