Object-Oriented Programming (OOP) MCQs for Software Developers

Last updated by Naina Batra on Jun 07, 2024 at 10:17 PM | Reading time: 15 minutes

Object-oriented programming (OOP) languages, like Java and Python, are crucial for software development and the developers are required to be well-versed in these programming languages. Learning never stops and one should assess their knowledge frequently to stay current and relevant in the growing competition.

We have curated a list of questions on OOPs languages. These questions cover various concepts in object-oriented programming (OOP) such as encapsulation, operator overloading, polymorphism, abstract classes, constructors, pointers, and so on.

These OOPs MCQs also touch on specific language features and syntax in C++ and Java, as well as broader OOP principles like object execution, disadvantages, generalization, and the nature of object classes.

So, let’s just dive straight into these questions.

Object-Oriented Programming (OOP) MCQs with Answers

Here are some of the most commonly asked OOP MCQs for software developers. These MCQs help in understanding various C++ OOP basics and Java OOP concepts, too.

Also read: Top OOPs interview questions for experienced programmers

Q1. Which of the following features can be implemented through encapsulation?

inheritance
abstraction
Polymorphism
Overloading

Answer: B. abstraction

Q2. Which of the following features in 00P is used for allocating additional functions to predefined operators in any language?

Function overloading
Operator overloading
Operator overriding
Function overriding

Answer: B. operator overloading

Q3. Which of the following underlines the feature of polymorphism in a class?

Virtual function
Enclosing class
Inline function
Nested class

Answer: A. Virtual function

Q4. Instance of which kind of class cannot be created?

Parent class
Abstract class
Nested class
Anonymous class

Answer: B. Abstract class

Q5. Which is not a necessary condition for constructors?

Its name must be the same as that of the class
It must not have any return type
It must contain a definition body
It can contain arguments

Answer: C. It must contain a definition body

Q6. Which is the correct syntax to declare a pointer to an object?

*className objectName;
className* objectName;
className objectName();
className objectName;

Answer: B. className* objectName;

Q7. Which keyword is used to declare static variables?

Const
common
static
stat

Answer: C. static

Q8. How can you access the private member function of the class?

Using class address
Using object of class
Using object pointer
Using the address of the member function

Answer: D. Using the address of the member function

Q9. Where is the memory for objects allocated?

Cache
ROM
HDD
RAM

Answer: D. RAM

Q10. Which keyword is used for declaring virtual functions?

virt
virtually
virtual
Anonymous

Answer: C. Virtual

Q11. How can you overcome the diamond problem?

Using separate derived class
Using q virtual keyword with the same name function
Can’t be done
Using alias name

Answer: B. Using a virtual keyword with the same name function

Q12. Which kind of members cannot be accessed and arrive in classes of a base class?

All can be accessed
Protected
Private
Public

Answer: C. Private

Q13. Which amongst the following is not a property of an object?

Properties
Names
Identity
Attributes

Answer: B. Names

Q14. Which of the following features of OOP decreases the use of nested classes?

Inheritance
Binding
Abstraction
Encapsulation

Answer: A. Inheritance

Q15. How can you access data members of a class?

Dot, arrow, or direct call
Dot operator
Arrow operator
Dot or arrow as required

Answer: D. Dot or arrow as required

Q16. Which of the following represents the correct constructor?

–classname()
classname()
()classname
~classname()

Answer: B. classname()

Q17. The copy constructors are used to:

Copy an object so that it can be passed to another primitive type variable
Copy an object for type-casting
Copy an object so that it can be passed to a function
Copy an object so that it can be passed to a class

Answer: C. Copy an object so that it can be passed to a function

Q18. Which is the most efficient feature of OOP used in multilevel inheritance?

Code efficiency
Code readability
Flexibility
Code reusability

Answer: D. Code reusability

Q19. In OOP, how many kinds of access specifiers are provided?

4
3
2
1

Answer: B. 3

Q20. Why is JAVA partially OOP language?

It allows code to be written outside classes
It supports the usual declaration of primitive data types
It does not support pointers
It doesn’t support all types of inheritance

Answer: B. It supports the usual declaration of primitive data types

Q21. Which header file is needed in C++ for using OOP?

OOP can be used without using any header file
stdlib.h
iostream.h
Stdio.h

Answer: A. OOP can be used without using any header file

Q22. Which OOP’s feature indicates reusability?

Abstraction
Polymorphism
Encapsulation
Inheritance

Answer: D. Inheritance

Q23. When did the concept of OOP first come into the picture?

1980’s
1995
1970’s
1993

Answer: C. 1970’s

Q24. Which of the following is the scope resolution operator?

?:
::
:
None of the above

Answer: B. ::

Q25. Which of the following was the first object-oriented programming language developed?

Kotlin
SmallTalk
Java
C++

Answer: SmallTalk

Q26. Name the object that collects data on request rather than autonomously.

Active Object
Passive Object
Multiple instance
None of the mentioned

Answer: B. Passive Object

Q27. Objects are executed

sequentially
in Parallel
Sequentially & Parallel
none of the mentioned

Answer: C. Sequentially & Parallel

Q28. Which of the following comes under the disadvantages of OOP?

Easier maintenance
Objects may be understood as stand-alone entities
Objects are potentially reusable components
None of the mentioned

Answer: D. None of the mentioned

Q29. In object-oriented programming languages, how is generalization implemented?

Inheritance
Polymorphism
Encapsulation
Abstract Classes

Answer: A. Inheritance

Q30. The object classes inherited are self-contained.

True
False

Answer: B. False

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FAQs: OOP MCQs

Q1. What is the salary of an OOP developer?

An object-oriented software developer earns an average salary of around $133,902 per year in the USA.

Q2. What makes object-oriented programmers' jobs unique?

When other programmers may write a succession of scripts to carry out tasks within a computer, object-oriented programmers develop sets of data fields and resulting functions that work together with one another to complete tasks.

Q3. What are the different job roles using OOP?

Several job roles use object-oriented design other than just being a software developer. Some of the interesting job roles are Java developer, Flutter developer, full-stack developer, UI architect, .NET developer, and systems programmer.

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Naina Batra

Manager, Content Marketing

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Contents

Naina Batra

Attend our Free Webinar on How to Nail Your Next Technical Interview

How to Nail your next Technical Interview

Worried About Failing Tech Interviews?

Tools to Enhance Full Stack Development with AI

The Future of Data Science: Emerging Trends and Opportunities

Data-Driven Decision Making: Your Roadmap to Business Success

The Business Impact of Machine Learning: Real-world Case Studies

What is OpenAI? Everything You Need to Know

Mock Interviews for Generative AI: Essential Practice to Land Top AI Roles

Top Python Scripting Interview Questions and Answers You Should Practice

Complex SQL Interview Questions for Interview Preparation

Zoox Software Engineer Interview Questions to Crack Your Tech Interview

Rubrik Interview Questions for Software Engineers

Top Advanced SQL Interview Questions and Answers

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