Frequently asked questions and answers of Visual Basic VB in Programming Technologies of Computer Science to enhance your skills, knowledge on the selected topic. We have compiled the best Visual Basic VB Interview question and answer, trivia quiz, mcq questions, viva question, quizzes to prepare. Download Visual Basic VB FAQs in PDF form online for academic course, jobs preparations and for certification exams .
Intervew Quizz is an online portal with frequently asked interview, viva and trivia questions and answers on various subjects, topics of kids, school, engineering students, medical aspirants, business management academics and software professionals.
Question-1. What is the purpose of the Global keyword?
Answer-1: It provides access to the root namespace.
Question-2. What is the difference between Public, Private, and Protected?
Answer-2: Public allows global access, Private restricts access to the containing class, and Protected allows access in derived classes.
Question-3. What is the Nullable type in VB.NET?
Answer-3: It allows value types to represent null values. Example: Dim x As Nullable(Of Integer).
Question-4. How do you work with threads in VB.NET?
Answer-4: Use the System.Threading namespace for thread creation and management.
Question-5. What is the purpose of SyncLock in VB.NET?
Answer-5: It ensures that a block of code runs without interruption by multiple threads.
Question-6. What is the purpose of TryCast in VB.NET?
Answer-6: It attempts to cast an object to a specified type, returning Nothing if unsuccessful.
Question-7. What is the Dim statement used for?
Answer-7: It declares a variable and optionally initializes it.
Question-8. How do you perform asynchronous operations in VB.NET?
Answer-8: Use Async and Await keywords for asynchronous programming.
Question-9. What is VB.NET?
Answer-9: VB.NET is an object-oriented programming language developed by Microsoft, running on the .NET framework.
Question-10. What is the .NET Framework?
Answer-10: It is a software framework for building and running applications on Windows. It includes CLR and BCL.
Question-11. What is the difference between VB and VB.NET?
Answer-11: VB is procedural; VB.NET is object-oriented and works with the .NET framework.
Question-12. What are assemblies in VB.NET?
Answer-12: Assemblies are compiled code libraries containing types and resources used for applications.
Question-13. What is the CLR in VB.NET?
Answer-13: CLR (Common Language Runtime) is the runtime environment of .NET that manages code execution.
Question-14. What is the CTS in VB.NET?
Answer-14: CTS (Common Type System) ensures type compatibility across languages in .NET.
Question-15. What is the difference between Sub and Function?
Answer-15: Sub doesn't return a value; Function returns a value.
Question-16. What is the Option Explicit statement?
Answer-16: It forces the declaration of all variables before use, reducing runtime errors.
Question-17. What is the Option Strict statement?
Answer-17: It enforces strict data type rules, preventing implicit data type conversions.
Question-18. What are namespaces in VB.NET?
Answer-18: Namespaces are containers for classes and types, preventing name conflicts.
Question-19. What is the purpose of the Imports keyword?
Answer-19: It is used to include namespaces in a VB.NET file.
Question-20. What is a module in VB.NET?
Answer-20: A module is a container for functions, subs, and variables that are shared across a project.
Question-21. How do you declare a variable in VB.NET?
Answer-21: Use Dim keyword. Example: Dim x As Integer.
Question-22. What are value types and reference types?
Answer-22: Value types store data directly; reference types store a reference to the data's memory location.
Question-23. What is the purpose of the ByVal and ByRef keywords?
Answer-23: ByVal passes arguments by value; ByRef passes arguments by reference.
Question-24. How do you handle exceptions in VB.NET?
Answer-24: Use the Try...Catch...Finally block.
Question-25. What is the Finally block in exception handling?
Answer-25: It contains code that executes whether an exception occurs or not.
Question-26. What are properties in VB.NET?
Answer-26: Properties are members used to access class fields using Get and Set blocks.
Question-27. What is the difference between Class and Structure?
Answer-27: Classes are reference types; structures are value types.
Question-28. What is inheritance in VB.NET?
Answer-28: It allows a class to acquire properties and methods of another class using the Inherits keyword.
Question-29. What is polymorphism in VB.NET?
Answer-29: Polymorphism allows methods to behave differently based on the object's type.
Question-30. What is encapsulation in VB.NET?
Answer-30: Encapsulation is the concept of hiding internal implementation details and exposing functionality.
Question-31. What is an interface in VB.NET?
Answer-31: An interface defines a contract that implementing classes must follow.
Question-32. How is an abstract class different from an interface?
Answer-32: Abstract classes can have implementations; interfaces cannot.
Question-33. What is the purpose of Shared keyword?
Answer-33: Shared denotes a member shared across all instances of a class.
Question-34. What are generics in VB.NET?
Answer-34: Generics allow type-safe operations with types specified at runtime.
Question-35. What is the purpose of the WithEvents keyword?
Answer-35: It allows automatic event handling for a declared object.
Question-36. What is the purpose of RaiseEvent in VB.NET?
Answer-36: It triggers an event manually in the code.
Question-37. How do you create a delegate in VB.NET?
Answer-37: Use Delegate keyword. Example: Delegate Sub MyDelegate().
Question-38. What are events in VB.NET?
Answer-38: Events are actions or occurrences that a class or control can respond to.
Question-39. What is LINQ in VB.NET?
Answer-39: LINQ (Language Integrated Query) allows querying data in collections, databases, and XML.
Question-40. How do you create a constructor in VB.NET?
Answer-40: Use the Sub New() method. Example: Public Sub New().
Question-41. What is the purpose of the Overridable keyword?
Answer-41: It allows a method to be overridden in derived classes.
Question-42. What is method overloading in VB.NET?
Answer-42: It is defining multiple methods with the same name but different parameter lists.
Question-43. What is method overriding in VB.NET?
Answer-43: It allows redefining a base class method in a derived class using Overrides keyword.
Question-44. What is the purpose of the My namespace?
Answer-44: It provides easy access to application, system, and user-specific information.
Question-45. What is the difference between Dispose and Finalize?
Answer-45: Dispose is called explicitly; Finalize is called by the garbage collector.
Question-46. What are partial classes in VB.NET?
Answer-46: Partial classes allow a class's definition to be split across multiple files.
Question-47. What is the purpose of the IsNot operator?
Answer-47: It checks if two objects are not equal.
Question-48. What is the use of the Select Case statement?
Answer-48: It is used for multi-way branching based on an expression's value.
Question-49. What is the purpose of Me in VB.NET?
Answer-49: Me refers to the current instance of a class.
Question-50. What is the purpose of MyBase in VB.NET?
Answer-50: MyBase refers to the base class of the current class.
Frequently Asked Question and Answer on Visual Basic VB
Visual Basic VB Interview Questions and Answers in PDF form Online
Visual Basic VB Questions with Answers
Visual Basic VB Trivia MCQ Quiz
