20 Microsoft VB.NET Quiz Questions and Answers

1. What is the correct way to declare a string variable in VB.NET?
A. Dim str As String = “Hello”
B. String str = “Hello”
C. var str As String = “Hello”
D. Declare str As String = “Hello”
Answer: A
Explanation: In VB.NET, variables are declared using the Dim keyword followed by the variable name and its data type.

2. Which keyword is used to handle exceptions in VB.NET?
A. Try-Catch
B. Error-Handle
C. Exception-Block
D. Fault-Trap
Answer: A
Explanation: The Try-Catch block is used for exception handling, allowing code to attempt an operation and catch any errors.

3. How do you create a simple console application that outputs “Hello World” in VB.NET?
A. Console.WriteLine(“Hello World”)
B. Print(“Hello World”)
C. Output.Write(“Hello World”)
D. Display(“Hello World”)
Answer: A
Explanation: The Console.WriteLine method is used to output text to the console in a VB.NET console application.

4. What is the output of the following code: Dim x As Integer = 5: Console.WriteLine(x += 3)
A. 8
B. 5
C. 3
D. Error
Answer: A
Explanation: The += operator adds 3 to x (which is 5), resulting in 8, and then outputs it.

5. Which loop is used when you know the number of iterations in advance in VB.NET?
A. For
B. While
C. Do While
D. For Each
Answer: A
Explanation: The For loop is ideal for iterating a specific number of times, as it includes a counter.

6. How do you declare an array of integers in VB.NET?
A. Dim arr() As Integer = {1, 2, 3}
B. Dim arr As Array = {1, 2, 3}
C. Array arr As Integer = {1, 2, 3}
D. Dim arr As Integer Array = {1, 2, 3}
Answer: A
Explanation: Arrays in VB.NET are declared using Dim followed by the array name, parentheses, and the data type.

7. What does the ‘Me’ keyword refer to in a VB.NET class?
A. The current instance of the class
B. A global variable
C. A static method
D. An inherited class
Answer: A
Explanation: ‘Me’ is a reference to the current object instance within a class method.

8. Which of the following is a correct way to define a function in VB.NET?
A. Function Add(a As Integer, b As Integer) As Integer: Return a + b: End Function
B. Sub Add(a As Integer, b As Integer) As Integer: Return a + b: End Sub
C. Function Add(a As Integer, b As Integer): Return a + b: End Function
D. Def Add(a As Integer, b As Integer) As Integer: Return a + b: End Def
Answer: A
Explanation: Functions in VB.NET use the Function keyword, specify parameters and return type, and end with End Function.

9. What is the purpose of the ‘Inherits’ keyword in VB.NET?
A. To inherit from a base class
B. To create an interface
C. To declare a variable
D. To handle events
Answer: A
Explanation: ‘Inherits’ is used in class declarations to indicate that the class inherits members from another class.

10. How do you convert a string to an integer in VB.NET?
A. CInt(“123”)
B. Convert.ToInt(“123”)
C. Integer.Parse(“123”)
D. Both A and C
Answer: D
Explanation: Both CInt and Integer.Parse can convert a string to an integer, though Integer.Parse is more explicit.

11. What is the correct syntax for a For Each loop in VB.NET?
A. For Each item In collection: Console.WriteLine(item): Next
B. For item In collection: Console.WriteLine(item): End For
C. Each item In collection: Console.WriteLine(item): Next
D. Loop For Each item In collection: Console.WriteLine(item): End Loop
Answer: A
Explanation: The For Each loop iterates through a collection, using the Next keyword to end the loop.

12. Which event is triggered when a form loads in a VB.NET Windows Forms application?
A. Form.Load
B. Form.Activate
C. Form.Start
D. Form.Initialize
Answer: A
Explanation: The Load event occurs when the form is loaded into memory, before it is displayed.

13. How do you declare a constant in VB.NET?
A. Const pi As Double = 3.14
B. Dim Const pi As Double = 3.14
C. Final pi As Double = 3.14
D. Static pi As Double = 3.14
Answer: A
Explanation: Constants are declared using the Const keyword, which makes the value unchangeable.

14. What is the output of: Dim x As Integer = 10: If x > 5 Then Console.WriteLine(“Greater”) End If
A. Greater
B. Nothing
C. Error
D. 10
Answer: A
Explanation: The If statement evaluates x > 5 as true, so it outputs “Greater”.

15. Which of the following is used for string concatenation in VB.NET?
A. &
B. +
C. Both A and B
D. Concat
Answer: C
Explanation: Both & and + can concatenate strings, but & is preferred to avoid numeric addition errors.

16. How do you import a namespace in VB.NET?
A. Imports System
B. Using System
C. Include System
D. Namespace System
Answer: A
Explanation: The Imports keyword is used at the top of a file to bring in namespaces for use.

17. What does the ‘Shared’ keyword mean in VB.NET?
A. The member belongs to the class, not an instance
B. The member is private
C. The member is an array
D. The member is a function
Answer: A
Explanation: Shared members are associated with the class itself and can be accessed without creating an instance.

18. Which method is used to read user input in a console application?
A. Console.ReadLine()
B. Input.Read()
C. Read.Input()
D. Console.Input()
Answer: A
Explanation: Console.ReadLine() reads a line of text from the standard input stream.

19. How do you handle multiple catch blocks in VB.NET?
A. Try…Catch ex As Exception…Catch ex As AnotherException…End Try
B. Try…Exception ex As Exception…End Try
C. Try…Multiple Catch…End Try
D. If…Catch…End If
Answer: A
Explanation: Multiple Catch blocks can be used within a Try block to handle different types of exceptions.

20. What is the correct way to create an object of a class in VB.NET?
A. Dim obj As New MyClass()
B. Create obj As MyClass
C. Dim obj = MyClass()
D. New obj As MyClass
Answer: A
Explanation: Objects are instantiated using the New keyword within a Dim statement.