Visual Programming MCQs with Answers
Practice important Visual Programming MCQs with answers and explanations.
Multiple Choice Questions
Q651: How does await affect method execution when used with Task.Run?
- A: It ensures the method waits for the completion of the task scheduled by Task.Run
- B: It starts the task in a new thread and immediately returns from the method
- C: It executes the task synchronously, blocking the main thread until the task finishes
- D: It allows the method to continue executing without waiting for the task to complete
View Answer
A
Q652: What is the benefit of using async lambdas compared to traditional lambda expressions?
- A: They allow for asynchronous operations inside lambda expressions and simplify async code
- B: They automatically handle exceptions and cancellation without additional code
- C: They convert all lambda expressions into asynchronous methods
- D: They eliminate the need for await when using lambda expressions
View Answer
A
Q653: In the provided code, what does the catch block handle in asynchronous methods?
- A: It handles exceptions that occur during the execution of asynchronous operations
- B: It ensures that the task completes successfully without any errors
- C: It cancels the task if an error occurs during execution
- D: It automatically retries the task upon failure
View Answer
A
Q654: What does await Task.Delay(5000, cancellationToken) do with respect to cancellation?
- A: It respects the provided cancellationToken and will throw an exception if cancellation is requested
- B: It cancels the delay operation immediately and does not wait for the specified time
- C: It ignores the cancellationToken and always completes after 5 seconds
- D: It ensures the task is completed even if cancellation is requested
View Answer
A
Q655: What is the main difference between Task.WhenAny and Task.WhenAll?
- A: Task.WhenAny returns the first completed task, while Task.WhenAll waits for all tasks to complete
- B: Task.WhenAll returns the first completed task, while Task.WhenAny waits for all tasks to complete
- C: Task.WhenAny and Task.WhenAll perform the same function but with different names
- D: Task.WhenAny waits for all tasks to complete, while Task.WhenAll returns the first completed task
View Answer
A
Q656: How does the Task.WhenAny method behave if one of the tasks fails?
- A: It immediately returns the failed task's result
- B: It throws an exception if any task fails and stops waiting for other tasks
- C: It returns the first completed task, regardless of whether it succeeded or failed
- D: It cancels all remaining tasks and does not return any results
View Answer
C
Q657: What does the Task.WhenAll method do when used with tasks that throw exceptions?
- A: It aggregates all exceptions from the tasks into a single AggregateException and rethrows it
- B: It ignores exceptions and returns successfully completed tasks only
- C: It terminates execution and returns a partial result if any task fails
- D: It handles exceptions individually and returns results of the successful tasks only
View Answer
A
Q658: What is the purpose of the Parallel.For method in the Task Parallel Library?
- A: To execute a loop in parallel, dividing the work among multiple threads
- B: To execute a loop sequentially without parallelism
- C: To create a new thread for each iteration of the loop
- D: To synchronize the execution of a loop across different threads
View Answer
A
Q659: What does the Parallel.ForEach method do with a collection of items?
- A: It executes a specified action on each item in the collection in parallel
- B: It processes each item sequentially in the order they appear in the collection
- C: It combines all items into a single result and processes them in parallel
- D: It ensures that each item in the collection is processed by a separate thread
View Answer
A
Q660: How can you handle exceptions in parallel tasks using Parallel.For or Parallel.ForEach?
- A: By using try-catch blocks inside the loop body to catch and handle exceptions
- B: By specifying a custom exception handler for the entire parallel operation
- C: By using a global exception handler that catches all exceptions thrown by parallel tasks
- D: By allowing exceptions to propagate without handling them
View Answer
A