Object-Oriented Programming (OOP) MCQs for Software Developers

Software developers should continue to assess their skills and knowledge through resources like OOPs MCQs. Because self-learning is vital to staying abreast of industry advancements.

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?

1. inheritance
2. abstraction
3. Polymorphism
4. Overloading

Answer: B. abstraction

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

1. Function overloading
2. Operator overloading
3. Operator overriding
4. Function overriding

Answer: B. operator overloading

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

1. Virtual function
2. Enclosing class
3. Inline function
4. Nested class

Answer: A. Virtual function

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

1. Parent class
2. Abstract class
3. Nested class
4. Anonymous class

Answer: B. Abstract class

Q5. Which is not a necessary condition for constructors?

1. Its name must be the same as that of the class
2. It must not have any return type
3. It must contain a definition body
4. 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?

1. *className objectName;
2. className* objectName;
3. className objectName();
4. className objectName;

Answer: B. className* objectName;

Q7. Which keyword is used to declare static variables?

1. Const
2. common
3. static
4. stat

Answer: C. static

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

1. Using class address
2. Using object of class
3. Using object pointer
4. Using the address of the member function

Answer: D. Using the address of the member function

Q9. Where is the memory for objects allocated?

1. Cache
2. ROM
3. HDD
4. RAM

Answer: D. RAM

Q10. Which keyword is used for declaring virtual functions?

1. virt
2. virtually
3. virtual
4. Anonymous

Answer: C. Virtual

Q11. How can you overcome the diamond problem?

1. Using separate derived class
2. Using q virtual keyword with the same name function
3. Can’t be done
4. 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?

1. All can be accessed
2. Protected
3. Private
4. Public

Answer: C. Private

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

1. Properties
2. Names
3. Identity
4. Attributes

Answer: B. Names

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

1. Inheritance
2. Binding
3. Abstraction
4. Encapsulation

Answer: A. Inheritance

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

1. Dot, arrow, or direct call
2. Dot operator
3. Arrow operator
4. Dot or arrow as required

Answer: D. Dot or arrow as required

Q16. Which of the following represents the correct constructor?

1. –classname()
2. classname()
3. ()classname
4. ~classname()

Answer: B. classname()

Q17. The copy constructors are used to:

1. Copy an object so that it can be passed to another primitive type variable
2. Copy an object for type-casting
3. Copy an object so that it can be passed to a function
4. 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?

1. Code efficiency
2. Code readability
3. Flexibility
4. Code reusability

Answer: D. Code reusability

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

1. 4
2. 3
3. 2
4. 1

Answer: B. 3

Q20. Why is JAVA partially OOP language?

1. It allows code to be written outside classes
2. It supports the usual declaration of primitive data types
3. It does not support pointers
4. 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?

1. OOP can be used without using any header file
2. stdlib.h
3. iostream.h
4. Stdio.h

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

Q22. Which OOP’s feature indicates reusability?

1. Abstraction
2. Polymorphism
3. Encapsulation
4. Inheritance

Answer: D. Inheritance

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

1. 1980’s
2. 1995
3. 1970’s
4. 1993

Answer: C. 1970’s

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

1. ?:
2. ::
3. :
4. None of the above

Answer: B. ::

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

1. Kotlin
2. SmallTalk
3. Java
4. C++

Answer: SmallTalk

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

1. Active Object
2. Passive Object
3. Multiple instance
4. None of the mentioned

Answer: B. Passive Object

Q27. Objects are executed

1. sequentially
2. in Parallel
3. Sequentially & Parallel
4. none of the mentioned

Answer: C. Sequentially & Parallel

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

1. Easier maintenance
2. Objects may be understood as stand-alone entities
3. Objects are potentially reusable components
4. None of the mentioned

Answer: D. None of the mentioned

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

1. Inheritance
2. Polymorphism
3. Encapsulation
4. Abstract Classes

Answer: A. Inheritance

Q30. The object classes inherited are self-contained.

1. True
2. 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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