Encapsulation & Abstraction — Practice MCQs for CCAT

Correct Answer: B — Bundling data and methods together

Encapsulation wraps data and methods that operate on data within a class.

Correct Answer: B — Making members private

Private members hide data from outside access.

Correct Answer: B — Controlled access to private data

Getters/setters provide controlled access to private members.

Correct Answer: B — Hiding implementation details

Abstraction hides complex implementation and shows only necessary features.

Correct Answer: C — private

Private is most restrictive - accessible only within the class.

Correct Answer: B — Same class and derived classes

Protected members are accessible in the class and its derived classes.

Correct Answer: B — Compilation

Four pillars of OOP: Encapsulation, Abstraction, Inheritance, Polymorphism.

Correct Answer: B — Abstract class with pure virtual functions

C++ doesn't have interface keyword; uses abstract classes with pure virtual functions.

Correct Answer: B — Data protection and modularity

Encapsulation protects data and provides modularity.

Correct Answer: B — Cannot modify non-static members

const member function cannot modify non-static data members.

Correct Answer: A — Hiding implementation details

Data abstraction hides implementation details and shows only functionality to users.

Correct Answer: B — = 0 syntax

Pure virtual function is declared with = 0: virtual void func() = 0;

Correct Answer: B — Both pure virtual and regular functions

Abstract class can have both pure virtual functions and regular member functions.

Correct Answer: B — Read private data safely

Getter (accessor) methods provide controlled read access to private data members.

Correct Answer: B — Modify private data with validation

Setter (mutator) methods provide controlled write access with optional validation.

Correct Answer: B — Classes have minimal dependencies

Loose coupling means classes have minimal dependencies on each other, improving maintainability.

Correct Answer: B — Private members and public interfaces

Information hiding uses private members accessed through public methods (getters/setters).

Correct Answer: B — Abstract class or interface

Abstract classes and interfaces provide better abstraction by defining contracts without implementation.

Correct Answer: B — Easier maintenance and data integrity

Encapsulation provides easier maintenance, data integrity, and protection from misuse.

Correct Answer: B — Interface abstraction and separate compilation

Header files separate interface from implementation, promoting abstraction and modularity.