C# Async Programming MCQ Questions with Answers – Page 2 (Latest 2026)

Q51. Which statement about async void is most accurate?

A. Returns a Task<void>. B. Recommended for all async methods. C. Used only for event handlers; cannot be awaited. D. A blocking call.

Select an answer to check.

Answer: Used only for event handlers; cannot be awaited.

Here, Used only for event handlers; cannot be awaited. is the right choice. Avoid except for events. It aligns directly with what the question asks about which statement about async void is most accurate. Competing choices sound plausible, but they miss the key condition.

Q52. How is async void best characterized?

A. Used only for event handlers; cannot be awaited. B. Returns a Task<void>. C. Recommended for all async methods. D. A blocking call.

Select an answer to check.

Answer: Used only for event handlers; cannot be awaited.

In this case, Used only for event handlers; cannot be awaited. is correct. Avoid except for events. It aligns directly with what the question asks about how is async void best characterized. Competing choices sound plausible, but they miss the key condition.

Q53. Which option best describes deadlock with .Result in C#/.NET?

A. A compiler optimization. B. A type of exception. C. Blocking on a Task that needs the captured context can deadlock. D. A guaranteed safe pattern.

Select an answer to check.

Answer: Blocking on a Task that needs the captured context can deadlock.

The best option here is Blocking on a Task that needs the captured context can deadlock.. Use await throughout instead. It aligns directly with what the question asks about which option best describes deadlock with .result in. Competing choices sound plausible, but they miss the key condition.

Q54. What is the primary purpose of deadlock with .Result?

A. A type of exception. B. A compiler optimization. C. Blocking on a Task that needs the captured context can deadlock. D. A guaranteed safe pattern.

Select an answer to check.

Answer: Blocking on a Task that needs the captured context can deadlock.

For this question, Blocking on a Task that needs the captured context can deadlock. is correct. Use await throughout instead. It aligns directly with what the question asks about what is the primary purpose of deadlock with. Competing choices sound plausible, but they miss the key condition.

Q55. Which statement about deadlock with .Result is most accurate?

A. A compiler optimization. B. A guaranteed safe pattern. C. A type of exception. D. Blocking on a Task that needs the captured context can deadlock.

Select an answer to check.

Answer: Blocking on a Task that needs the captured context can deadlock.

Blocking on a Task that needs the captured context can deadlock. is the correct answer here. Use await throughout instead. It aligns directly with what the question asks about which statement about deadlock with .result is most. Competing choices sound plausible, but they miss the key condition.

Q56. How is deadlock with .Result best characterized?

A. Blocking on a Task that needs the captured context can deadlock. B. A type of exception. C. A compiler optimization. D. A guaranteed safe pattern.

Select an answer to check.

Answer: Blocking on a Task that needs the captured context can deadlock.

Here, Blocking on a Task that needs the captured context can deadlock. is the right choice. Use await throughout instead. This matches the core idea being tested around how is deadlock with .result best characterized. Competing choices sound plausible, but they miss the key condition.

Q57. Which option best describes IAsyncEnumerable<T> in C#/.NET?

A. A subclass of List<T>. B. A synchronous iterator only. C. A LINQ provider. D. Async streams allowing await foreach.

Select an answer to check.

Answer: Async streams allowing await foreach.

In this case, Async streams allowing await foreach. is correct. Stream async data efficiently. This matches the core idea being tested around which option best describes iasyncenumerable<t> in c#/.net. Competing choices sound plausible, but they miss the key condition.

Q58. What is the primary purpose of IAsyncEnumerable<T>?

A. Async streams allowing await foreach. B. A subclass of List<T>. C. A LINQ provider. D. A synchronous iterator only.

Select an answer to check.

Answer: Async streams allowing await foreach.

The best option here is Async streams allowing await foreach.. Stream async data efficiently. This matches the core idea being tested around what is the primary purpose of iasyncenumerable<t>. Competing choices sound plausible, but they miss the key condition.

Q59. Which statement about IAsyncEnumerable<T> is most accurate?

A. Async streams allowing await foreach. B. A subclass of List<T>. C. A LINQ provider. D. A synchronous iterator only.

Select an answer to check.

Answer: Async streams allowing await foreach.

For this question, Async streams allowing await foreach. is correct. Stream async data efficiently. This matches the core idea being tested around which statement about iasyncenumerable<t> is most accurate. Competing choices sound plausible, but they miss the key condition.

Q60. How is IAsyncEnumerable<T> best characterized?

A. Async streams allowing await foreach. B. A LINQ provider. C. A subclass of List<T>. D. A synchronous iterator only.

Select an answer to check.

Answer: Async streams allowing await foreach.

Async streams allowing await foreach. is the correct answer here. Stream async data efficiently. This matches the core idea being tested around how is iasyncenumerable<t> best characterized. Competing choices sound plausible, but they miss the key condition.

Q61. Which option best describes await foreach in C#/.NET?

A. Iterates synchronously over IEnumerable. B. Iterates IAsyncEnumerable<T> asynchronously. C. Spawns a new task per element always. D. Blocks on each element.

Select an answer to check.

Answer: Iterates IAsyncEnumerable<T> asynchronously.

Here, Iterates IAsyncEnumerable<T> asynchronously. is the right choice. Companion to IAsyncEnumerable. That is exactly the concept behind which option best describes await foreach in c#/.net in this context. Competing choices sound plausible, but they miss the key condition.

Q62. What is the primary purpose of await foreach?

A. Spawns a new task per element always. B. Iterates IAsyncEnumerable<T> asynchronously. C. Iterates synchronously over IEnumerable. D. Blocks on each element.

Select an answer to check.

Answer: Iterates IAsyncEnumerable<T> asynchronously.

In this case, Iterates IAsyncEnumerable<T> asynchronously. is correct. Companion to IAsyncEnumerable. That is exactly the concept behind what is the primary purpose of await foreach in this context. Competing choices sound plausible, but they miss the key condition.

Q63. Which statement about await foreach is most accurate?

A. Iterates synchronously over IEnumerable. B. Spawns a new task per element always. C. Iterates IAsyncEnumerable<T> asynchronously. D. Blocks on each element.

Select an answer to check.

Answer: Iterates IAsyncEnumerable<T> asynchronously.

The best option here is Iterates IAsyncEnumerable<T> asynchronously.. Companion to IAsyncEnumerable. That is exactly the concept behind which statement about await foreach is most accurate in this context. Competing choices sound plausible, but they miss the key condition.

Q64. How is await foreach best characterized?

A. Iterates synchronously over IEnumerable. B. Blocks on each element. C. Spawns a new task per element always. D. Iterates IAsyncEnumerable<T> asynchronously.

Select an answer to check.

Answer: Iterates IAsyncEnumerable<T> asynchronously.

For this question, Iterates IAsyncEnumerable<T> asynchronously. is correct. Companion to IAsyncEnumerable. That is exactly the concept behind how is await foreach best characterized in this context. Competing choices sound plausible, but they miss the key condition.

Q65. Which option best describes ConfigureAwait(true) in C#/.NET?

A. Default behavior: capture context for continuation. B. Disables continuation entirely. C. Forces background continuation. D. Cancels the task.

Select an answer to check.

Answer: Default behavior: capture context for continuation.

Default behavior: capture context for continuation. is the correct answer here. Implicit in most app code. That is exactly the concept behind which option best describes configureawait(true) in c#/.net in this context. Competing choices sound plausible, but they miss the key condition.

Q66. What is the primary purpose of ConfigureAwait(true)?

A. Disables continuation entirely. B. Forces background continuation. C. Default behavior: capture context for continuation. D. Cancels the task.

Select an answer to check.

Answer: Default behavior: capture context for continuation.

Here, Default behavior: capture context for continuation. is the right choice. Implicit in most app code. It fits the requirement in the prompt about what is the primary purpose of configureawait(true). Competing choices sound plausible, but they miss the key condition.

Q67. Which statement about ConfigureAwait(true) is most accurate?

A. Cancels the task. B. Disables continuation entirely. C. Forces background continuation. D. Default behavior: capture context for continuation.

Select an answer to check.

Answer: Default behavior: capture context for continuation.

In this case, Default behavior: capture context for continuation. is correct. Implicit in most app code. It fits the requirement in the prompt about which statement about configureawait(true) is most accurate. Competing choices sound plausible, but they miss the key condition.

Q68. How is ConfigureAwait(true) best characterized?

A. Forces background continuation. B. Disables continuation entirely. C. Cancels the task. D. Default behavior: capture context for continuation.

Select an answer to check.

Answer: Default behavior: capture context for continuation.

The best option here is Default behavior: capture context for continuation.. Implicit in most app code. It fits the requirement in the prompt about how is configureawait(true) best characterized. Competing choices sound plausible, but they miss the key condition.

Q69. Which option best describes a TaskCompletionSource in C#/.NET?

A. A subclass of Thread. B. Manually controlled Task that you complete. C. An event. D. An interface for delegates.

Select an answer to check.

Answer: Manually controlled Task that you complete.

For this question, Manually controlled Task that you complete. is correct. Bridges callback APIs to Task. It fits the requirement in the prompt about which option best describes a taskcompletionsource in c#/.net. Competing choices sound plausible, but they miss the key condition.

Q70. What is the primary purpose of a TaskCompletionSource?

A. An interface for delegates. B. Manually controlled Task that you complete. C. An event. D. A subclass of Thread.

Select an answer to check.

Answer: Manually controlled Task that you complete.

Manually controlled Task that you complete. is the correct answer here. Bridges callback APIs to Task. It fits the requirement in the prompt about what is the primary purpose of a taskcompletionsource. Competing choices sound plausible, but they miss the key condition.

Q71. Which statement about a TaskCompletionSource is most accurate?

A. A subclass of Thread. B. An interface for delegates. C. Manually controlled Task that you complete. D. An event.

Select an answer to check.

Answer: Manually controlled Task that you complete.

Here, Manually controlled Task that you complete. is the right choice. Bridges callback APIs to Task. This is the most accurate statement for which statement about a taskcompletionsource is most accurate. Competing choices sound plausible, but they miss the key condition.

Q72. How is a TaskCompletionSource best characterized?

A. Manually controlled Task that you complete. B. A subclass of Thread. C. An interface for delegates. D. An event.

Select an answer to check.

Answer: Manually controlled Task that you complete.

In this case, Manually controlled Task that you complete. is correct. Bridges callback APIs to Task. This is the most accurate statement for how is a taskcompletionsource best characterized. Competing choices sound plausible, but they miss the key condition.

Q73. Which option best describes synchronous over async (sync-over-async) in C#/.NET?

A. An optimizer hint. B. Calling .Result/.Wait() on a Task; can deadlock. C. A best practice. D. A compile-time error.

Select an answer to check.

Answer: Calling .Result/.Wait() on a Task; can deadlock.

The best option here is Calling .Result/.Wait() on a Task; can deadlock.. Avoid; await all the way down. This is the most accurate statement for which option best describes synchronous over async (sync-over-async). Competing choices sound plausible, but they miss the key condition.

Q74. What is the primary purpose of synchronous over async (sync-over-async)?

A. Calling .Result/.Wait() on a Task; can deadlock. B. A compile-time error. C. A best practice. D. An optimizer hint.

Select an answer to check.

Answer: Calling .Result/.Wait() on a Task; can deadlock.

For this question, Calling .Result/.Wait() on a Task; can deadlock. is correct. Avoid; await all the way down. This is the most accurate statement for what is the primary purpose of synchronous over. Competing choices sound plausible, but they miss the key condition.

Q75. Which statement about synchronous over async (sync-over-async) is most accurate?

A. A compile-time error. B. An optimizer hint. C. Calling .Result/.Wait() on a Task; can deadlock. D. A best practice.

Select an answer to check.

Answer: Calling .Result/.Wait() on a Task; can deadlock.

Calling .Result/.Wait() on a Task; can deadlock. is the correct answer here. Avoid; await all the way down. This is the most accurate statement for which statement about synchronous over async (sync-over-async) is. Competing choices sound plausible, but they miss the key condition.

Q76. How is synchronous over async (sync-over-async) best characterized?

A. Calling .Result/.Wait() on a Task; can deadlock. B. A best practice. C. An optimizer hint. D. A compile-time error.

Select an answer to check.

Answer: Calling .Result/.Wait() on a Task; can deadlock.

Here, Calling .Result/.Wait() on a Task; can deadlock. is the right choice. Avoid; await all the way down. It aligns directly with what the question asks about how is synchronous over async (sync-over-async) best characterized. The remaining choices fail because they don’t satisfy the full definition.

Q77. Which option best describes parallel vs concurrent in C#/.NET?

A. Same thing. B. Concurrent always uses GPU. C. Parallel always uses async/await. D. Parallel = simultaneous execution; concurrent = interleaved.

Select an answer to check.

Answer: Parallel = simultaneous execution; concurrent = interleaved.

In this case, Parallel = simultaneous execution; concurrent = interleaved. is correct. Async is concurrency primitive. It aligns directly with what the question asks about which option best describes parallel vs concurrent in. The remaining choices fail because they don’t satisfy the full definition.

Q78. What is the primary purpose of parallel vs concurrent?

A. Concurrent always uses GPU. B. Parallel always uses async/await. C. Parallel = simultaneous execution; concurrent = interleaved. D. Same thing.

Select an answer to check.

Answer: Parallel = simultaneous execution; concurrent = interleaved.

The best option here is Parallel = simultaneous execution; concurrent = interleaved.. Async is concurrency primitive. It aligns directly with what the question asks about what is the primary purpose of parallel vs. The remaining choices fail because they don’t satisfy the full definition.

Q79. Which statement about parallel vs concurrent is most accurate?

A. Concurrent always uses GPU. B. Parallel = simultaneous execution; concurrent = interleaved. C. Parallel always uses async/await. D. Same thing.

Select an answer to check.

Answer: Parallel = simultaneous execution; concurrent = interleaved.

For this question, Parallel = simultaneous execution; concurrent = interleaved. is correct. Async is concurrency primitive. It aligns directly with what the question asks about which statement about parallel vs concurrent is most. The remaining choices fail because they don’t satisfy the full definition.

Q80. How is parallel vs concurrent best characterized?

A. Parallel = simultaneous execution; concurrent = interleaved. B. Same thing. C. Concurrent always uses GPU. D. Parallel always uses async/await.

Select an answer to check.

Answer: Parallel = simultaneous execution; concurrent = interleaved.

Parallel = simultaneous execution; concurrent = interleaved. is the correct answer here. Async is concurrency primitive. It aligns directly with what the question asks about how is parallel vs concurrent best characterized. The remaining choices fail because they don’t satisfy the full definition.

Q81. Which option best describes the thread pool in C#/.NET?

A. A pool of GPU streams. B. A cache of awaiters. C. Pool of reusable worker threads managed by the runtime. D. A list of process IDs.

Select an answer to check.

Answer: Pool of reusable worker threads managed by the runtime.

Here, Pool of reusable worker threads managed by the runtime. is the right choice. Tasks default to running here. This matches the core idea being tested around which option best describes the thread pool in. The remaining choices fail because they don’t satisfy the full definition.

Q82. What is the primary purpose of the thread pool?

A. A cache of awaiters. B. A list of process IDs. C. Pool of reusable worker threads managed by the runtime. D. A pool of GPU streams.

Select an answer to check.

Answer: Pool of reusable worker threads managed by the runtime.

In this case, Pool of reusable worker threads managed by the runtime. is correct. Tasks default to running here. This matches the core idea being tested around what is the primary purpose of the thread. The remaining choices fail because they don’t satisfy the full definition.

Q83. Which statement about the thread pool is most accurate?

A. A list of process IDs. B. A pool of GPU streams. C. Pool of reusable worker threads managed by the runtime. D. A cache of awaiters.

Select an answer to check.

Answer: Pool of reusable worker threads managed by the runtime.

The best option here is Pool of reusable worker threads managed by the runtime.. Tasks default to running here. This matches the core idea being tested around which statement about the thread pool is most. The remaining choices fail because they don’t satisfy the full definition.

Q84. How is the thread pool best characterized?

A. A cache of awaiters. B. Pool of reusable worker threads managed by the runtime. C. A pool of GPU streams. D. A list of process IDs.

Select an answer to check.

Answer: Pool of reusable worker threads managed by the runtime.

For this question, Pool of reusable worker threads managed by the runtime. is correct. Tasks default to running here. This matches the core idea being tested around how is the thread pool best characterized. The remaining choices fail because they don’t satisfy the full definition.

Q85. Which option best describes IO-bound work in C#/.NET?

A. UI rendering only. B. CPU-intensive computations. C. Pure math operations. D. Operations that wait on external resources (disk, net).

Select an answer to check.

Answer: Operations that wait on external resources (disk, net).

Operations that wait on external resources (disk, net). is the correct answer here. Async/await is ideal here. This matches the core idea being tested around which option best describes io-bound work in c#/.net. The remaining choices fail because they don’t satisfy the full definition.

Q86. What is the primary purpose of IO-bound work?

A. CPU-intensive computations. B. Operations that wait on external resources (disk, net). C. UI rendering only. D. Pure math operations.

Select an answer to check.

Answer: Operations that wait on external resources (disk, net).

Here, Operations that wait on external resources (disk, net). is the right choice. Async/await is ideal here. That is exactly the concept behind what is the primary purpose of io-bound work in this context. The remaining choices fail because they don’t satisfy the full definition.

Q87. Which statement about IO-bound work is most accurate?

A. UI rendering only. B. Pure math operations. C. CPU-intensive computations. D. Operations that wait on external resources (disk, net).

Select an answer to check.

Answer: Operations that wait on external resources (disk, net).

In this case, Operations that wait on external resources (disk, net). is correct. Async/await is ideal here. That is exactly the concept behind which statement about io-bound work is most accurate in this context. The remaining choices fail because they don’t satisfy the full definition.

Q88. How is IO-bound work best characterized?

A. UI rendering only. B. Operations that wait on external resources (disk, net). C. Pure math operations. D. CPU-intensive computations.

Select an answer to check.

Answer: Operations that wait on external resources (disk, net).

The best option here is Operations that wait on external resources (disk, net).. Async/await is ideal here. That is exactly the concept behind how is io-bound work best characterized in this context. The remaining choices fail because they don’t satisfy the full definition.

Q89. Which option best describes CPU-bound work in C#/.NET?

A. Computation-heavy work better offloaded with Task.Run. B. Sleep statements only. C. IO waits with no CPU. D. UI thread work only.

Select an answer to check.

Answer: Computation-heavy work better offloaded with Task.Run.

For this question, Computation-heavy work better offloaded with Task.Run. is correct. Run on background thread. That is exactly the concept behind which option best describes cpu-bound work in c#/.net in this context. The remaining choices fail because they don’t satisfy the full definition.

Q90. What is the primary purpose of CPU-bound work?

A. IO waits with no CPU. B. Computation-heavy work better offloaded with Task.Run. C. Sleep statements only. D. UI thread work only.

Select an answer to check.

Answer: Computation-heavy work better offloaded with Task.Run.

Computation-heavy work better offloaded with Task.Run. is the correct answer here. Run on background thread. That is exactly the concept behind what is the primary purpose of cpu-bound work in this context. The remaining choices fail because they don’t satisfy the full definition.

Q91. Which statement about CPU-bound work is most accurate?

A. UI thread work only. B. IO waits with no CPU. C. Sleep statements only. D. Computation-heavy work better offloaded with Task.Run.

Select an answer to check.

Answer: Computation-heavy work better offloaded with Task.Run.

Here, Computation-heavy work better offloaded with Task.Run. is the right choice. Run on background thread. It fits the requirement in the prompt about which statement about cpu-bound work is most accurate. The remaining choices fail because they don’t satisfy the full definition.

Q92. How is CPU-bound work best characterized?

A. IO waits with no CPU. B. Sleep statements only. C. UI thread work only. D. Computation-heavy work better offloaded with Task.Run.

Select an answer to check.

Answer: Computation-heavy work better offloaded with Task.Run.

In this case, Computation-heavy work better offloaded with Task.Run. is correct. Run on background thread. It fits the requirement in the prompt about how is cpu-bound work best characterized. The remaining choices fail because they don’t satisfy the full definition.

Q93. Which option best describes ExceptionDispatchInfo in C#/.NET?

A. Preserves stack trace when re-throwing across threads. B. A subclass of Exception. C. A Task type. D. An attribute.

Select an answer to check.

Answer: Preserves stack trace when re-throwing across threads.

The best option here is Preserves stack trace when re-throwing across threads.. Used internally by Task awaiters. It fits the requirement in the prompt about which option best describes exceptiondispatchinfo in c#/.net. The remaining choices fail because they don’t satisfy the full definition.

Q94. What is the primary purpose of ExceptionDispatchInfo?

A. Preserves stack trace when re-throwing across threads. B. A subclass of Exception. C. A Task type. D. An attribute.

Select an answer to check.

Answer: Preserves stack trace when re-throwing across threads.

For this question, Preserves stack trace when re-throwing across threads. is correct. Used internally by Task awaiters. It fits the requirement in the prompt about what is the primary purpose of exceptiondispatchinfo. The remaining choices fail because they don’t satisfy the full definition.

Q95. Which statement about ExceptionDispatchInfo is most accurate?

A. A subclass of Exception. B. A Task type. C. An attribute. D. Preserves stack trace when re-throwing across threads.

Select an answer to check.

Answer: Preserves stack trace when re-throwing across threads.

Preserves stack trace when re-throwing across threads. is the correct answer here. Used internally by Task awaiters. It fits the requirement in the prompt about which statement about exceptiondispatchinfo is most accurate. The remaining choices fail because they don’t satisfy the full definition.

Q96. How is ExceptionDispatchInfo best characterized?

A. An attribute. B. Preserves stack trace when re-throwing across threads. C. A subclass of Exception. D. A Task type.

Select an answer to check.

Answer: Preserves stack trace when re-throwing across threads.

Here, Preserves stack trace when re-throwing across threads. is the right choice. Used internally by Task awaiters. This is the most accurate statement for how is exceptiondispatchinfo best characterized. The remaining choices fail because they don’t satisfy the full definition.

Q97. Which option best describes AggregateException in C#/.NET?

A. A subclass of NullReferenceException. B. An attribute. C. A delegate. D. Wraps multiple exceptions thrown by parallel tasks.

Select an answer to check.

Answer: Wraps multiple exceptions thrown by parallel tasks.

In this case, Wraps multiple exceptions thrown by parallel tasks. is correct. Returned by Task.Wait when multiple errors occur. This is the most accurate statement for which option best describes aggregateexception in c#/.net. The remaining choices fail because they don’t satisfy the full definition.

Q98. What is the primary purpose of AggregateException?

A. A delegate. B. Wraps multiple exceptions thrown by parallel tasks. C. A subclass of NullReferenceException. D. An attribute.

Select an answer to check.

Answer: Wraps multiple exceptions thrown by parallel tasks.

The best option here is Wraps multiple exceptions thrown by parallel tasks.. Returned by Task.Wait when multiple errors occur. This is the most accurate statement for what is the primary purpose of aggregateexception. The remaining choices fail because they don’t satisfy the full definition.

Q99. Which statement about AggregateException is most accurate?

A. A subclass of NullReferenceException. B. Wraps multiple exceptions thrown by parallel tasks. C. An attribute. D. A delegate.

Select an answer to check.

Answer: Wraps multiple exceptions thrown by parallel tasks.

For this question, Wraps multiple exceptions thrown by parallel tasks. is correct. Returned by Task.Wait when multiple errors occur. This is the most accurate statement for which statement about aggregateexception is most accurate. The remaining choices fail because they don’t satisfy the full definition.

Q100. How is AggregateException best characterized?

A. A subclass of NullReferenceException. B. Wraps multiple exceptions thrown by parallel tasks. C. An attribute. D. A delegate.

Select an answer to check.

Answer: Wraps multiple exceptions thrown by parallel tasks.

Wraps multiple exceptions thrown by parallel tasks. is the correct answer here. Returned by Task.Wait when multiple errors occur. This is the most accurate statement for how is aggregateexception best characterized. The remaining choices fail because they don’t satisfy the full definition.