C# Async Programming Quiz

Welcome to the C# Asynchronous Programming Quiz! This quiz is designed to test your understanding of asynchronous programming concepts in C#, including the use of async and await keywords, the Task class, handling cancellations, and more. Each question will challenge your knowledge of how to implement and manage asynchronous operations in C# to improve the performance and responsiveness of your applications.

What is the main benefit of asynchronous programming?

It makes applications run in a single thread only.

It guarantees no exceptions will occur during execution.

It allows multiple tasks to run in the background without blocking the main thread.

It eliminates the need for error handling.

None

Which C# feature provides structured concurrency and allows safe parallel execution?

Synchronous Programming

Task Asynchronous Programming (TAP)

Thread.Sleep method

Thread class

None

What happens when a long-running task is performed on the main thread?

The task automatically runs in the background.

The application appears to lock up until the task completes.

The application continues to run smoothly.

The task throws an exception.

None

What keyword is used to declare an asynchronous method in C#?

thread

async

task

await

None

Which class in C# represents an asynchronous operation?

ThreadPool

Task

Delegate

Thread

None

What does the 'await' keyword do in an asynchronous method?

It starts the task immediately.

It throws an exception if the task fails.

It blocks the current thread until the task completes.

It suspends the execution of the method until the asynchronous task completes.

None

What is the purpose of the CancellationTokenSource class?

To automatically restart a task after it completes.

To limit the number of tasks running simultaneously.

To cancel running asynchronous tasks.

To catch exceptions in asynchronous methods.

None

What method is called to actually cancel a task using a CancellationToken?

Pause

Stop

Abort

Cancel

None

What exception is thrown when an asynchronous task is canceled?

TaskCanceledException

OperationCanceledException

AggregateException

ThreadAbortException

None

10.

Why might you use 'await Task.Delay()' instead of 'Task.Delay().Wait()' in the async method?

Because ‘await’ speeds up execution.

Because ‘Wait()’ throws an exception in asynchronous code.

Because ‘await’ allows the method to run without blocking the current thread.

Because ‘await’ is only used in synchronous code.

None

11.

What will happen if you omit the 'await' operator when calling an asynchronous method?

The method will run asynchronously, but the calling code won’t wait for its result.

The method will run synchronously.

The code will throw an error.

The method will not run at all.

None

12.

What method is used to run asynchronous tasks from a synchronous context?

Task.Start

Task.Run

Async.Run

Thread.Start

None

13.

Which statement about asynchronous tasks is true?

Asynchronous tasks always take longer to execute than synchronous tasks.

Asynchronous tasks run in parallel, reducing execution time.

Asynchronous tasks cannot be canceled.

Asynchronous tasks throw exceptions if they exceed a certain time limit.

None

14.

Which operator is used in C# to wait for the result of an asynchronous method call?

continue

wait

await

async

None

15.

What happens when Task.WaitAll() is called in C#?

It throws an exception if any task fails.

It cancels all running tasks.

It restarts all running tasks.

It waits for all specified tasks to complete before continuing execution.

None

16.

Why might you use a 'finally' block when dealing with asynchronous tasks?

To stop an asynchronous task.

To handle the exception thrown by an async method.

To ensure certain code is executed whether an exception occurs or not.

To guarantee that a task completes before continuing.

None

17.

What property of a Task object is used to retrieve the result of an asynchronous method?

Return

Get

Value

Result

None

18.

What is the role of CancellationToken in asynchronous programming?

It restarts completed tasks.

It provides a mechanism to cancel running asynchronous tasks.

It pauses asynchronous tasks temporarily.

It manages the order of asynchronous tasks.

None

19.

Which of the following statements is true about the async keyword?

Async methods must always be awaited.

The async keyword guarantees parallel execution.

Async methods can return Task or Task.

Async methods return void.

None

20.

What exception is typically thrown when a task is canceled?

TimeoutException

ArgumentNullException

InvalidOperationException

TaskCanceledException

None

21.

What is the benefit of using Task.WaitAll() in C#?

It cancels all running tasks.

It starts all asynchronous tasks at the same time.

It waits for all tasks to complete before proceeding.

It runs tasks sequentially.

None

22.

Why would you use Task.Run in a synchronous method?

To convert the method to asynchronous execution.

To stop the method from running synchronously.

To force the method to return immediately.

To avoid using async and await keywords.

None

23.

What is the purpose of the CancellationTokenSource class?

To handle errors thrown by async methods.

To provide cancellation tokens to signal task cancellation.

To control the thread that an async method runs on.

To control the lifetime of an asynchronous task.

None

24.

What does Task.Run() do in C#?

It waits for a task to complete before running.

It forces a task to execute on the main thread.

It schedules a task to run asynchronously on the thread pool.

It runs a task synchronously.

None

25.

What happens when a Task is awaited in C#?

The method continues to run in parallel with the Task.

The Task is canceled automatically.

The calling method is blocked.

The calling method is suspended until the Task completes.

None

Time’s up

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