1. What does the term "polymorphism" in object-oriented programming refer to?
A. Objects take multiple forms
B. The ability to hide data
C. The reuse of code
D. The process of creating a new class from an existing class
Answer: A) Objects take multiple forms
Rationale: Polymorphism allows objects to take on different forms, typically
through method overloading or method overriding.
2. What does the this keyword refer to in object-oriented programming?
A. A reference to the current class
B. A reference to the current object
C. A reference to the parent class
D. A reference to the method in the class
Answer: B) A reference to the current object
Rationale: The this keyword refers to the current instance of the class.
,3. Which of the following is the correct definition of abstraction in OOP?
A. Hiding data and methods from external access
B. Defining the interface and leaving the implementation to the derived class
C. Reusing code from multiple classes
D. Overloading methods in the same class
Answer: B) Defining the interface and leaving the implementation to the derived
class
Rationale: Abstraction hides the complex implementation details and exposes only
the necessary parts of an object or class through a simplified interface.
4. Which of the following is an advantage of object-oriented programming?
A. It is faster to write than procedural programming
B. It focuses on the behavior of data
C. It uses fewer resources
D. It organizes code into objects that can be easily reused
Answer: D) It organizes code into objects that can be easily reused
, Rationale: OOP promotes code reuse, modularity, and easier maintenance by
organizing code into reusable objects.
5. What is the purpose of a destructor in object-oriented programming?
A. To initialize the state of an object
B. To destroy an object and free memory
C. To return a value from an object
D. To define methods for an object
Answer: B) To destroy an object and free memory
Rationale: A destructor is a special method used to clean up or release resources
when an object is destroyed.
6. Which of the following is a key feature of encapsulation?
A. Hiding the implementation details
B. Reusing code from parent classes
C. Sharing data between different classes
D. Allowing multiple objects to inherit the same properties
Answer: A) Hiding the implementation details
A. Objects take multiple forms
B. The ability to hide data
C. The reuse of code
D. The process of creating a new class from an existing class
Answer: A) Objects take multiple forms
Rationale: Polymorphism allows objects to take on different forms, typically
through method overloading or method overriding.
2. What does the this keyword refer to in object-oriented programming?
A. A reference to the current class
B. A reference to the current object
C. A reference to the parent class
D. A reference to the method in the class
Answer: B) A reference to the current object
Rationale: The this keyword refers to the current instance of the class.
,3. Which of the following is the correct definition of abstraction in OOP?
A. Hiding data and methods from external access
B. Defining the interface and leaving the implementation to the derived class
C. Reusing code from multiple classes
D. Overloading methods in the same class
Answer: B) Defining the interface and leaving the implementation to the derived
class
Rationale: Abstraction hides the complex implementation details and exposes only
the necessary parts of an object or class through a simplified interface.
4. Which of the following is an advantage of object-oriented programming?
A. It is faster to write than procedural programming
B. It focuses on the behavior of data
C. It uses fewer resources
D. It organizes code into objects that can be easily reused
Answer: D) It organizes code into objects that can be easily reused
, Rationale: OOP promotes code reuse, modularity, and easier maintenance by
organizing code into reusable objects.
5. What is the purpose of a destructor in object-oriented programming?
A. To initialize the state of an object
B. To destroy an object and free memory
C. To return a value from an object
D. To define methods for an object
Answer: B) To destroy an object and free memory
Rationale: A destructor is a special method used to clean up or release resources
when an object is destroyed.
6. Which of the following is a key feature of encapsulation?
A. Hiding the implementation details
B. Reusing code from parent classes
C. Sharing data between different classes
D. Allowing multiple objects to inherit the same properties
Answer: A) Hiding the implementation details
