C# Exception MCQs

Question 1: Which of the following is the base class for all types of exceptions?

Answer: D

The System.Exception class is the base class for all the exceptions in .NET Framework.

Question 2: Which of the following statement is TRUE?

Answer: B

All the runtime errors are called exceptions and compile-time errors called errors.

Question 3: What will be the output of the following program?

public static void Main()
{
    int[] arr = {1, 2, 3, 4, 5};
    Console.Write(arr[10]);
    Console.WriteLine("End of Program");
}

Answer: B

It throws an IndixOutOfRange exception and terminates the execution of the remaining program. This is why we need to handle exception to prevent the unexpected termination of the program. Learn exception handling in C#.

Question 4: What will be the output of the following program?

public static void Main()
{
    int[] arr = {1, 2, 3, 4, 5};
    
    try
    {
        Console.Write(arr[10]);
    }    
    catch(Exception ex)
    {
        Console.WriteLine("Error occurred!");
    }

    Console.WriteLine("Execute remaining program..");		
}

Answer: B

Since it handles all kinds of exception using catch() block, it will not be terminated and execute the catch block and also continue the execution of the remaining code after the catch block. If the finally block follows the catch block then all the code after the finally block will be executed. Learn exception handling in C#.

Question 5: What will be the output of the following program?

public static void Main()
{
    int[] arr = {1, 2, 3, 4, 5};
	try
    {
        Console.Write(arr[5]);
    }    
    catch(NullReferenceException  ex)
    {
        Console.WriteLine("Error occurred!");
    }
	Console.WriteLine("Execute remaining program");
}

Answer: C.

arr[5] will raise IndexOutOfRangeException exception and the catch block handles only NullReferenceExceptio, so this exception will not be handled and program will be terminated. Learn exception handling in C#.

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