How to use the OOPs MCQ Quiz
- 1. Pick the lengthChoose 10 OOPs questions or all 21, with shuffle on or off.
- 2. Answer each questionTap an option to see at once if it is right, plus a short OOPs explanation.
- 3. See your scoreFinish to get your OOPs score and a review of all your answers.
What this quiz covers
OOPs questions appear in nearly every technical interview, whatever language you use. This quiz covers:
- The four pillars: encapsulation, abstraction, inheritance and polymorphism.
- Polymorphism types: overloading (compile-time) vs overriding (run-time), and virtual functions in C++.
- Classes and objects: constructors, destructors, this, and static members.
- Design: is-a vs has-a, abstract classes vs interfaces, the diamond problem, coupling and cohesion.
- Access and principles: access modifiers, friend functions and the S in SOLID.
Worked example and how to use it
Example: Method overriding gives which kind of polymorphism? The answer is run-time. If Animal a = new Dog(); and you call a.speak(), the method that runs is chosen at run time from the actual object, a Dog. Overloading is different: the compiler picks between add(int, int) and add(double, double) from the argument types, so it is compile-time polymorphism.
How to answer OOPs questions in interviews:
- Give a one-line definition, then a real example: "Encapsulation is hiding data behind methods, like a BankAccount whose balance can only change through deposit() and withdraw()."
- Know the differences: abstract class vs interface, overloading vs overriding, composition vs inheritance.
- Mention trade-offs: inheritance is powerful, but deep hierarchies are hard to change, so many teams prefer composition. Saying this shows you think about design, not just definitions.
Frequently asked questions
Which language does the quiz use?
The ideas apply to any OOP language. A few questions mention Java, C++ or Python specifics, and say so.
Is SOLID covered fully?
One question introduces SOLID. The other four principles are worth reading about after the quiz.
How many questions should I get right?
Aim for 17 or more out of 21 before a technical interview.
Is it free?
Yes. Take the quiz freely; the final score asks for your name and WhatsApp number once, and then all Uncodemy tools are open to you.