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Object-oriented model MCQs in DBMS

1. Which of the following is a characteristic of an object-oriented database model?

(A) Data is organized into tables and rows.


(B) Data and its behavior are encapsulated as objects.


(C) Relationships are represented by sets.


(D) It does not support inheritance.


2. In an object-oriented database, an object is defined as:

(A) A collection of related tables.


(B) An instance of a class that contains both data and methods.


(C) A unique identifier for data retrieval.


(D) A key used to link tables together.


3. Which feature of the object-oriented model allows objects to inherit properties and methods from other objects?

(A) Encapsulation


(B) Polymorphism


(C) Inheritance


(D) Abstraction


4. What does OODBMS stand for?

(A) Object-Oriented Database Management System


(B) Object-Oriented Data and Business Management System


(C) Object-Oriented Distributed Business Management System


(D) Object-Oriented Design and Build Management System


5. In the object-oriented model, a class is:

(A) A collection of tables.


(B) A blueprint for creating objects.


(C) A unique identifier for an object.


(D) A method for accessing data.


6. Which of the following best describes polymorphism in an object-oriented database?

(A) The ability to define multiple classes.


(B) The ability to process objects differently based on their data type or class.


(C) The ability to encapsulate data.


(D) The ability to inherit properties from multiple classes.


7. What is encapsulation in the context of an object-oriented database?

(A) The process of inheriting properties.


(B) The process of bundling data and methods that operate on the data into a single unit.


(C) The process of defining multiple forms for a single function.


(D) The process of abstracting data.


8. In an object-oriented database, a method is:

(A) A function or procedure associated with an object.


(B) A unique identifier for an object.


(C) A collection of tables and rows.


(D) A property of a class.


9. Which of the following is NOT a benefit of an object-oriented database model?

(A) Reusability of code through inheritance.


(B) Natural representation of real-world entities.


(C) Simplicity of data retrieval using SQL.


(D) Encapsulation of data and behavior.


10. Which of the following is an example of an object-oriented database management system?

(A) MySQL


(B) PostgreSQL


(C) db4o


(D) Microsoft SQL Server


11. In an object-oriented database, the term “message” refers to:

(A) Data stored in the database.


(B) A request for an object to execute one of its methods.


(C) A unique identifier for a class.


(D) A table linking different objects.


12. Which concept in the object-oriented model ensures that an object can be represented in multiple forms?

(A) Encapsulation


(B) Inheritance


(C) Polymorphism


(D) Abstraction


13. The process of defining an object’s structure and behavior without specifying its implementation is known as:

(A) Encapsulation


(B) Inheritance


(C) Polymorphism


(D) Abstraction


14. In object-oriented databases, objects that share common properties and methods are grouped into:

(A) Classes


(B) Tables


(C) Records


(D) Sets


15. Which of the following is a key challenge in implementing object-oriented databases?

(A) Lack of support for complex data types.


(B) Difficulty in modeling real-world entities.


(C) Integrating with existing relational databases.


(D) Lack of support for encapsulation.


16. In an object-oriented database, a “constructor” is:

(A) A method used to create an object and initialize its state.


(B) A property that uniquely identifies an object.


(C) A collection of objects.


(D) A function to destroy an object.


17. Which of the following features in the object-oriented model allows objects to be reused in different programs?

(A) Encapsulation


(B) Inheritance


(C) Polymorphism


(D) Abstraction


18. Which term refers to the ability of different classes to respond to the same message in different ways in an object-oriented database?

(A) Encapsulation


(B) Inheritance


(C) Polymorphism


(D) Abstraction


19. Which of the following best describes the concept of “object identity” in an object-oriented database?

(A) Objects have a unique identifier independent of their attribute values.


(B) Objects are identified based on their attribute values.


(C) Objects have the same identifier if they have similar attributes.


(D) Objects cannot have unique identifiers.


20. Which of the following is a key advantage of using an object-oriented database?

(A) Simple data model


(B) Faster data retrieval


(C) Better representation of complex data and relationships


(D) Easier integration with SQL-based systems


MCQs on Object-Oriented Model in DBMS

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