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 guarantees no exceptions will occur during execution.

It eliminates the need for error handling.

None

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

Task Asynchronous Programming (TAP)

Thread class

Synchronous Programming

Thread.Sleep method

None

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

The application continues to run smoothly.

The task throws an exception.

The task automatically runs in the background.

The application appears to lock up until the task completes.

None

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

async

task

await

thread

None

Which class in C# represents an asynchronous operation?

Delegate

ThreadPool

Thread

Task

None

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

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

It throws an exception if the task fails.

It starts the task immediately.

It blocks the current thread until the 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 catch exceptions in asynchronous methods.

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?

OperationCanceledException

ThreadAbortException

AggregateException

TaskCanceledException

None

10.

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

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

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

Because ‘await’ is only used in synchronous code.

Because ‘await’ speeds up execution.

None

11.

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

The method will not run at all.

The method will run synchronously.

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

The code will throw an error.

None

12.

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

Task.Start

Thread.Start

Async.Run

Task.Run

None

13.

Which statement about asynchronous tasks is true?

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

Asynchronous tasks always take longer to execute than synchronous tasks.

Asynchronous tasks cannot be canceled.

Asynchronous tasks run in parallel, reducing execution time.

None

14.

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

async

await

continue

wait

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 waits for all specified tasks to complete before continuing execution.

It restarts all running tasks.

None

16.

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

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

To stop an asynchronous task.

To guarantee that a task completes before continuing.

To handle the exception thrown by an async method.

None

17.

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

Result

Value

Get

Return

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 manages the order of asynchronous tasks.

It pauses asynchronous tasks temporarily.

None

19.

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

Async methods return void.

Async methods can return Task or Task.

Async methods must always be awaited.

The async keyword guarantees parallel execution.

None

20.

What exception is typically thrown when a task is canceled?

InvalidOperationException

TaskCanceledException

ArgumentNullException

TimeoutException

None

21.

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

It runs tasks sequentially.

It starts all asynchronous tasks at the same time.

It cancels all running tasks.

It waits for all tasks to complete before proceeding.

None

22.

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

To stop the method from running synchronously.

To force the method to return immediately.

To convert the method to asynchronous execution.

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 lifetime of an asynchronous task.

To control the thread that an async method runs on.

None

24.

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

It waits for a task to complete before running.

It runs a task synchronously.

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

It forces a task to execute on the main thread.

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 blocked.

The calling method is suspended until the Task completes.

The Task is canceled automatically.

None

Time’s up

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