MCQs on Object-Oriented Programming in VB.NET | Visual Basic .NET (VB.NET)

Dive into the core concepts of VB.NET’s Object-Oriented Programming (OOP). Test your understanding of classes, objects, properties, methods, events, encapsulation, inheritance, and polymorphism with these targeted questions.

Object-Oriented Programming in VB.NET MCQs

Classes and Objects

1. Which keyword is used to create a new instance of a class in VB.NET?
   • a) New
   • b) Class
   • c) Object
   • d) Create
2. What is the main purpose of a class in VB.NET?
   • a) To define the structure of objects
   • b) To execute methods directly
   • c) To handle exceptions
   • d) To display output
3. In VB.NET, what is the correct syntax to define a class?
   • a) Create Class ClassName
   • b) Define ClassName
   • c) Class ClassName
   • d) New ClassName
4. Which of the following is true about objects?
   • a) Objects can only store methods.
   • b) Objects are instances of classes.
   • c) Objects are defined without classes.
   • d) Objects cannot have properties.
5. How do you access a method of an object in VB.NET?
   • a) Object.Method()
   • b) Object->Method()
   • c) Method.Object()
   • d) Call Method.Object

Properties, Methods, and Events

6. What is a property in VB.NET?
   • a) A method with no parameters
   • b) A variable that stores data
   • c) A member used to get or set values
   • d) An event trigger
7. How can you define a property in VB.NET?
   • a) Using the Dim keyword
   • b) Using the Property keyword
   • c) Using the Function keyword
   • d) Using the Sub keyword
8. What does the “Set” block of a property do?
   • a) Reads the property value
   • b) Updates the property value
   • c) Deletes the property
   • d) Initializes the property
9. Which statement is true about methods in VB.NET?
   • a) They are used to declare variables.
   • b) They are functions or subroutines within a class.
   • c) They are events triggered during runtime.
   • d) They cannot accept parameters.
10. How can you handle an event in VB.NET?
    • a) Using the Event keyword
    • b) Using the Handles keyword
    • c) Using the Triggers keyword
    • d) Using the Raise keyword

Encapsulation, Inheritance, and Polymorphism

11. What does encapsulation mean in VB.NET?
    • a) Grouping data and methods into a class
    • b) Dividing a program into modules
    • c) Using multiple methods with the same name
    • d) Overriding methods in subclasses
12. How is inheritance implemented in VB.NET?
    • a) Using the Implements keyword
    • b) Using the Inherits keyword
    • c) Using the Override keyword
    • d) Using the Extends keyword
13. Which is a benefit of inheritance in VB.NET?
    • a) Improved data encapsulation
    • b) Code reusability and hierarchy
    • c) Reduced class size
    • d) Prevents method overriding
14. What is polymorphism in VB.NET?
    • a) A way to create multiple classes
    • b) Allowing methods to take many forms
    • c) Storing multiple values in a single variable
    • d) Encapsulation of objects
15. Which type of polymorphism involves method overriding?
    • a) Static polymorphism
    • b) Dynamic polymorphism
    • c) Hybrid polymorphism
    • d) Functional polymorphism
16. What keyword is used to override a base class method in VB.NET?
    • a) Override
    • b) Overloads
    • c) Extends
    • d) New
17. In VB.NET, which access modifier restricts access to a class and its derived classes?
    • a) Private
    • b) Protected
    • c) Public
    • d) Friend
18. Which concept ensures that internal details of a class are hidden?
    • a) Inheritance
    • b) Encapsulation
    • c) Polymorphism
    • d) Overloading
19. What is the term for a method that has the same name but different parameters?
    • a) Method overriding
    • b) Method hiding
    • c) Method overloading
    • d) Method extension
20. What is the default access level for members of a class in VB.NET?
    • a) Private
    • b) Public
    • c) Protected
    • d) Friend

Answers