C# Exception Handling Quiz

Welcome to the C# Exception Handling Quiz! This quiz is designed to test your understanding of how C# manages exceptions, including how they are thrown, caught, and handled using try-catch blocks. You will also encounter questions about creating custom exceptions, using the finally block, and implementing exception filters. The quiz will challenge your knowledge of best practices for handling runtime errors in C# and ensure you’re prepared to write robust, error-resistant code.

What does the 'base' keyword do in a custom exception class?

It calls the constructor of the Exception class

It handles exception propagation

It prevents exceptions from being thrown

It initializes the exception without any parameters

None

How does an exception filter help in handling exceptions?

By allowing multiple exceptions to be caught in the same catch block

By ignoring exceptions and allowing execution to continue

By preventing exceptions from being thrown

By suppressing specific exceptions

None

What does the 'inner' parameter in an exception constructor represent?

It stores additional information about the error

It is used to catch the exception

It holds the reference to another exception that caused the current exception

It defines the error type

None

What is the primary purpose of a custom exception constructor?

To override the ‘finally’ block

To create a new exception type with a message and optional properties

To prevent exceptions from being thrown

To handle exceptions automatically

None

Why would you create a custom exception?

To provide more specific error-handling scenarios in your application

To replace try-catch

To stop built-in exceptions from working

To remove the need for error handling

None

Which of the following methods is used to re-throw an exception?

throw ex;

catch ex;

finally;

throw;

None

How can multiple exceptions be caught in C#?

By using a single catch block for all exceptions

By using the finally block

By using multiple catch blocks with different exception types

By using a try-catch-finally block

None

What does 'try-finally' ensure?

That exceptions will be ignored

That the finally block will run, even if no exception is thrown

That the exception is caught before it reaches the finally block

That the program will stop running

None

Which keyword allows you to define a clean-up operation, regardless of whether an exception occurs?

throw

try

catch

finally

None

10.

What happens when an exception is not caught in any method in the call hierarchy?

The method returns a default value

The exception is logged but the program continues

The program terminates

The exception is ignored

None

11.

Which keyword is used to throw an exception in C#?

catch

try

throw

finally

None

12.

What does the 'finally' block guarantee?

It guarantees that no exceptions will be thrown

It guarantees that the code inside it will execute whether or not an exception occurs

It guarantees exception handling will occur

It guarantees that the app will stop execution

None

13.

What is an exception?

A compile-time error

A runtime error that disrupts the flow of program execution

A feature in object-oriented programming

A type of class in C#

None

14.

What is the effect of calling 'throw;' inside a catch block?

It suppresses the exception

It handles the exception internally

It re-throws the caught exception to propagate it upward

It stops the current method execution

None

15.

What is the purpose of exception handling in C#?

To make code more complex

To bypass errors and continue execution

To ensure that code runs faster

To handle errors gracefully and prevent app crashes

None

16.

Why might you create a custom exception in C#?

To provide more specific error details for a unique situation

To handle runtime errors

To replace built-in exception handling

To prevent exceptions from being thrown

None

17.

Which statement correctly re-throws an exception caught in a catch block?

catch { rethrow; }

catch { return exception; }

catch { throw new; }

catch { throw; }

None

18.

How do you access the exception message in a catch block?

By calling ex.Message

By using ex.GetMessage()

By calling exception.ErrorMessage()

By using ex.ExceptionType

None

19.

What will happen if an exception is thrown inside a method but not caught in the same method?

The exception will propagate up the call hierarchy

The program will automatically catch the exception

The method will return a null value

The program will terminate immediately

None

20.

Which of the following best describes exception filters using the 'when' keyword?

They are used to define custom exceptions

They are used to catch multiple exception types in a single catch block

They prevent exceptions from being thrown

They create a new scope for exceptions

None

21.

Which of the following is TRUE about a 'catch' block?

It must always be followed by a ‘finally’ block

It handles exceptions thrown in the corresponding ‘try’ block

It only catches syntax errors

It only handles custom exceptions

None

22.

In a try-catch block, what does the 'try' section do?

Contains the exception handling logic

Contains code that may throw an exception

Contains code that is skipped if an exception occurs

Catches any thrown exceptions

None

23.

What is the role of the 'throw' keyword in C#?

To skip the current method

To catch exceptions

To throw exceptions and trigger error handling

To suppress exceptions

None

24.

Which of the following is a built-in exception type in C#?

NullPointerException

ArgumentOutOfRangeException

HighVoltageException

ResourceNotAvailableException

None

25.

What happens when an exception is thrown in C#?

The program continues execution normally

The exception is caught and ignored

Control is transferred to exception-handling code

The program skips to the end of the method

None

Time’s up

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