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Encapsulation Interview Questions

MCQ Question 1 of 10

Question 1: C++ OOPS - Encapsulation Concept

What is encapsulation in C++?

Wrapping data and functions into a single unit (class)Hiding implementation details and showing only the interfaceCreating objects from classesReusing existing code in new classes

Question 2: C++ OOPS - Access Modifiers in Encapsulation

Which access modifier is mainly used to achieve encapsulation in C++?

privatepublicprotecteddefault

Question 3: C++ OOPS - Example of Encapsulation

If age is a private member of class Person, how should it be accessed?

Directly: obj.age = 20;Using getter and setter methodsUsing friend functions onlyBy declaring it public

Question 4: C++ OOPS - Benefit of Encapsulation

Which of the following is NOT a benefit of encapsulation?

Data hidingEasy code maintenanceInheritance of data membersIncreased security

Question 5: C++ OOPS - Access Control

What will happen if you try to directly access a private data member of a class?

It will compile successfullyIt will throw a runtime errorIt will cause a compile-time errorIt will automatically create a public reference

Question 6: C++ OOPS - Encapsulation & Abstraction

How is encapsulation different from abstraction?

Encapsulation focuses on hiding implementation, abstraction focuses on binding dataEncapsulation is data hiding, abstraction is hiding implementation detailsBoth are exactly the same in C++Encapsulation only applies to inheritance

Question 7: C++ OOPS - Getter Method

Which is the correct way to write a getter for salary (private) in class Employee?

int salary() { return salary; }int getSalary() { return salary; }int getSalary() { return this->salary; }Both B and C

Question 8: C++ OOPS - Setter Method

Which is the best way to define a setter for salary in class Employee?

void setSalary(int s) { salary = s; }void setSalary() { return; }salary = s;int setSalary(int s) { return s; }

Question 9: C++ OOPS - Encapsulation Security

Why does encapsulation improve security?

It prevents other classes from creating objectsIt restricts direct access to data membersIt removes the need for access specifiersIt automatically encrypts data

Question 10: C++ OOPS - Real-life Example of Encapsulation

Which of the following is a real-world analogy for encapsulation?

Inheritance like child inheriting parent traitsATM machine hiding inner details and giving access via interfaceCar engine being inherited by bikeFunction overloading in calculators