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

It eliminates the need for error handling.

It guarantees no exceptions will occur during execution.

None

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

Synchronous Programming

Thread class

Task Asynchronous Programming (TAP)

Thread.Sleep method

None

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

The task automatically runs in the background.

The application continues to run smoothly.

The application appears to lock up until the task completes.

The task throws an exception.

None

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

async

await

task

thread

None

Which class in C# represents an asynchronous operation?

Thread

ThreadPool

Task

Delegate

None

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

It starts the task immediately.

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

It blocks the current thread until the task completes.

It throws an exception if the task fails.

None

What is the purpose of the CancellationTokenSource class?

To catch exceptions in asynchronous methods.

To limit the number of tasks running simultaneously.

To automatically restart a task after it completes.

To cancel running asynchronous tasks.

None

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

Cancel

Pause

Abort

Stop

None

What exception is thrown when an asynchronous task is canceled?

AggregateException

ThreadAbortException

TaskCanceledException

OperationCanceledException

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 synchronously.

The code will throw an error.

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

The method will not run at all.

None

12.

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

Async.Run

Task.Run

Task.Start

Thread.Start

None

13.

Which statement about asynchronous tasks is true?

Asynchronous tasks cannot be canceled.

Asynchronous tasks always take longer to execute than synchronous tasks.

Asynchronous tasks run in parallel, reducing execution time.

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

async

await

None

15.

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

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

It throws an exception if any task fails.

It restarts all running tasks.

It cancels all running tasks.

None

16.

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

To handle the exception thrown by an async method.

To stop an asynchronous task.

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

Result

Value

Get

None

18.

What is the role of CancellationToken in asynchronous programming?

It manages the order of asynchronous tasks.

It provides a mechanism to cancel running asynchronous tasks.

It pauses asynchronous tasks temporarily.

It restarts completed tasks.

None

19.

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

The async keyword guarantees parallel execution.

Async methods return void.

Async methods can return Task or Task.

Async methods must always be awaited.

None

20.

What exception is typically thrown when a task is canceled?

TaskCanceledException

TimeoutException

ArgumentNullException

InvalidOperationException

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 avoid using async and await keywords.

To stop the method from running synchronously.

To convert the method to asynchronous execution.

To force the method to return immediately.

None

23.

What is the purpose of the CancellationTokenSource class?

To control the thread that an async method runs on.

To control the lifetime of an asynchronous task.

To handle errors thrown by async methods.

To provide cancellation tokens to signal task cancellation.

None

24.

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

It forces a task to execute on the main thread.

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

It waits for a task to complete before running.

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 calling method is suspended until the Task completes.

The calling method is blocked.

The Task is canceled automatically.

None

Time’s up

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