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 initializes the exception without any parameters

It prevents exceptions from being thrown

It handles exception propagation

None

How does an exception filter help in handling exceptions?

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

By preventing exceptions from being thrown

By suppressing specific exceptions

By ignoring exceptions and allowing execution to continue

None

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

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

It stores additional information about the error

It is used to catch the exception

It defines the error type

None

What is the primary purpose of a custom exception constructor?

To handle exceptions automatically

To prevent exceptions from being thrown

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

To override the ‘finally’ block

None

Why would you create a custom exception?

To remove the need for error handling

To provide more specific error-handling scenarios in your application

To replace try-catch

To stop built-in exceptions from working

None

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

throw ex;

finally;

catch ex;

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 a try-catch-finally block

By using multiple catch blocks with different exception types

None

What does 'try-finally' ensure?

That exceptions will be ignored

That the program will stop running

That the exception is caught before it reaches the finally block

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

None

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

catch

try

throw

finally

None

10.

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

The exception is ignored

The exception is logged but the program continues

The method returns a default value

The program terminates

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

It guarantees that the app will stop execution

It guarantees exception handling will occur

It guarantees that no exceptions will be thrown

None

13.

What is an exception?

A compile-time error

A type of class in C#

A feature in object-oriented programming

A runtime error that disrupts the flow of program execution

None

14.

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

It re-throws the caught exception to propagate it upward

It suppresses the exception

It stops the current method execution

It handles the exception internally

None

15.

What is the purpose of exception handling in C#?

To handle errors gracefully and prevent app crashes

To bypass errors and continue execution

To make code more complex

To ensure that code runs faster

None

16.

Why might you create a custom exception in C#?

To provide more specific error details for a unique situation

To replace built-in exception handling

To handle runtime errors

To prevent exceptions from being thrown

None

17.

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

catch { throw; }

catch { rethrow; }

catch { return exception; }

catch { throw new; }

None

18.

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

By calling ex.Message

By using ex.GetMessage()

By using ex.ExceptionType

By calling exception.ErrorMessage()

None

19.

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

The method will return a null value

The exception will propagate up the call hierarchy

The program will terminate immediately

The program will automatically catch the exception

None

20.

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

They prevent exceptions from being thrown

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

They are used to define custom exceptions

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 only catches syntax errors

It handles exceptions thrown in the corresponding ‘try’ block

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 is skipped if an exception occurs

Catches any thrown exceptions

Contains code that may throw an exception

None

23.

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

To throw exceptions and trigger error handling

To suppress exceptions

To skip the current method

To catch exceptions

None

24.

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

NullPointerException

ResourceNotAvailableException

ArgumentOutOfRangeException

HighVoltageException

None

25.

What happens when an exception is thrown in C#?

The exception is caught and ignored

Control is transferred to exception-handling code

The program skips to the end of the method

The program continues execution normally

None

Time’s up

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