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Practice Inheritance MCQs in C with beginner-friendly questions on abstract classes, polymorphism, and code reusability for students

It was a rainy evening, and I was revising for my Programming in C . As I flipped through my notes, I realized that inheritance—a concept I had read about many times—felt abstract and hard to grasp. I asked myself, “How can I really understand it instead of just memorizing?”

The answer came when I started practicing MCQs on inheritance. Each question acted like a mini-challenge, helping me connect theory with real coding scenarios. I discovered how base classes pass properties to derived classes, how abstract classes define interfaces, and how polymorphism makes programs flexible.

Through this hands-on approach, I transformed a complex topic into something tangible. And now, I want to share this learning path with other students so you can master inheritance in C++ the way I did—step by step, MCQ by MCQ.

Inheritance MCQs in C

Introduction of Inheritance MCQs in C

Inheritance is a fundamental concept in C++ that allows a class (derived class) to acquire properties and behaviors of another class (base class). Understanding inheritance is crucial for code reusability, polymorphism, and creating efficient object-oriented programs.

If you are a student preparing for the Programming in C++ course, these MCQs on inheritance will help you revise key concepts effectively.

Key Concepts of Inheritance in C

Before diving into MCQs, let’s understand the essential topics:

Base Class & Derived Class:
The class whose properties are inherited is the base class, and the class that inherits is the derived class.
Types of Inheritance:
- Single Inheritance
- Multiple Inheritance
- Multilevel Inheritance
- Hierarchical Inheritance
- Hybrid Inheritance
Access Specifiers in C++:
- public inheritance
- protected inheritance
- private inheritance
Abstract Classes & Pure Virtual Functions:
Abstract classes cannot be instantiated and are used to define a common interface for derived classes.
Polymorphism:
Enables objects to behave differently based on the class type, often achieved using virtual functions.

Beginner-Friendly MCQs on Inheritance

1. What is inheritance in C?

a) Reusing existing functions
b) Reusing existing classes
c) Creating a new object
d) Overloading operators

Answer: b) Reusing existing classes

2. Which type of inheritance allows a derived class to inherit from multiple base classes?

a) Single Inheritance
b) Multiple Inheritance
c) Multilevel Inheritance
d) Hierarchical Inheritance

Answer: b) Multiple Inheritance

3. Which access specifier allows a derived class to inherit all public and protected members of the base class?

a) Private
b) Protected
c) Public
d) Friend

Answer: c) Public

4. Which of the following cannot be instantiated in C?

a) Base Class
b) Derived Class
c) Abstract Class
d) Friend Class

Answer: c) Abstract Class

5. What is polymorphism in C?

a) Reusing code in multiple classes
b) Ability of a function or object to take multiple forms
c) Writing multiple functions with the same name
d) Using multiple inheritance

Answer: b) Ability of a function or object to take multiple forms

6. What is the purpose of a pure virtual function?

a) To overload a function
b) To define a function in the base class that must be implemented in derived classes
c) To hide a function
d) To define a private function

Answer: b) To define a function in the base class that must be implemented in derived classes

7. Which inheritance type can cause the “diamond problem”?

a) Single Inheritance
b) Multiple Inheritance
c) Multilevel Inheritance
d) Hybrid Inheritance

Answer: b) Multiple Inheritance

8. What is code reusability in C?

a) Using code without understanding
b) Writing the same code repeatedly
c) Using existing class properties in a new class
d) Creating new functions for each task

Answer: c) Using existing class properties in a new class

9. Which keyword is used to declare a virtual function?

a) virtual
b) override
c) abstract
d) polymorphic

Answer: a) virtual

10. What is dynamic memory allocation in inheritance?

a) Memory assigned at compile-time
b) Memory assigned at runtime
c) Memory shared by all objects
d) Memory allocated only for base class

Answer: b) Memory assigned at runtime

11. Which of the following statements about base class constructors is correct?

a) Base class constructors are not called when creating a derived class object
b) Base class constructors are called automatically before derived class constructors
c) Base class constructors can only be called manually
d) Base class constructors are ignored in inheritance

Answer: b) Base class constructors are called automatically before derived class constructors

12. Which type of inheritance avoids duplication of base class members in multiple inheritance?

a) Single Inheritance
b) Virtual Inheritance
c) Multilevel Inheritance
d) Hierarchical Inheritance

Answer: b) Virtual Inheritance

13. Which of the following is true about protected members in a base class?

a) They are not accessible in derived classes
b) They are accessible only in the same class
c) They are accessible in derived classes but not outside the class hierarchy
d) They are always public

Answer: c) They are accessible in derived classes but not outside the class hierarchy

14. What is the output of the following code snippet if

Base has a function display() and Derived overrides it, and you call

Base* ptr = new Derived(); ptr->display();?

a) Base class display function
b) Derived class display function
c) Compilation error
d) Runtime error

Answer: b) Derived class display function

15. Which keyword is used to prevent a class from being inherited?

a) virtual
b) final
c) sealed
d) abstract

Answer: b) final

16. Which of the following is true about multiple inheritance in C?

a) It is not supported
b) Derived class inherits from only one base class
c) A derived class can inherit features from more than one base class
d) Multiple inheritance cannot use polymorphism

Answer: c) A derived class can inherit features from more than one base class

17. In multilevel inheritance, which class constructor is executed first?

a) Most derived class constructor
b) Base class constructor
c) Middle class constructor
d) Random constructor

Answer: b) Base class constructor

18. What is the main advantage of using inheritance?

a) It makes code longer
b) It promotes code reusability and modularity
c) It increases compilation time
d) It prevents polymorphism

Answer: b) It promotes code reusability and modularity

19. Which of the following statements is true about virtual functions?

a) They are only used in base classes
b) They allow derived class functions to override base class functions dynamically
c) They cannot be overridden
d) They are automatically inline

Answer: b) They allow derived class functions to override base class functions dynamically

20. Which of the following best describes hybrid inheritance ?

a) Single inheritance only
b) Combination of two or more types of inheritance
c) Multilevel inheritance only
d) Inheritance without base classes

Answer: b) Combination of two or more types of inheritance

Conclusion

Mastering inheritance in C is essential for understanding object-oriented programming and building efficient applications. Practicing these MCQs will help GTU students strengthen concepts like abstract classes, code reusability, polymorphism, and multiple inheritance.

To boost your preparation further:

Review base class and derived class concepts.
Practice creating abstract classes and virtual functions.
Explore different types of inheritance in small programs.

You can also Visit other tutorials of Embedded Prep

Master Inheritance MCQs in C (2025) – Frequently Asked Questions

What is inheritance in C?

Inheritance is an object-oriented programming concept that allows a class to acquire properties and behaviors from another class. In C, we simulate inheritance using structures and function pointers.

How is polymorphism related to inheritance in C?

Polymorphism allows functions to behave differently based on the object type. In C, this can be achieved using function pointers and structures, often in combination with inheritance-like patterns.

What are abstract classes in C?

C doesn’t have built-in abstract classes like C++, but you can mimic them using structures with function pointers that act as “abstract methods” to enforce implementation in derived structures.

How do MCQs help in learning inheritance in C?

MCQs reinforce understanding of concepts like polymorphism, abstract classes, and code reusability by testing knowledge in a structured way, making learning more interactive and effective.

Can we reuse code in C using inheritance?

Yes, by designing structures and function pointers thoughtfully, you can reuse code across multiple modules, simulating inheritance patterns.

Are inheritance MCQs only for advanced programmers?

No. Beginner-friendly MCQs are designed to gradually introduce inheritance, making it easier for learners at all levels.

What are some common mistakes while learning inheritance in C?

Mistakes include confusing function pointers, improper structure usage, and misunderstanding the simulation of abstract classes or polymorphism.

How do I practice inheritance MCQs effectively?

Start with simple questions, implement concepts in code, review answers, and progressively move to advanced MCQs covering polymorphism and abstract structures.

Are these MCQs updated for 2025 standards?

Yes, the questions are aligned with current C programming practices and focus on beginner-friendly, practical understanding for 2025 learners.

Where can I find free MCQs for practicing inheritance in C?

You can find curated, beginner-friendly MCQs on educational platforms, coding blogs, and sites like Embedded Prep Master that focus on practical learning.

Category: cpp mcq

Master Inheritance MCQs in C (2026)