Visual Programming MCQs with Answers
Practice important Visual Programming MCQs with answers and explanations.
Multiple Choice Questions
Q631: What is the role of getprimescountasync in the code provided?
- A: It asynchronously computes the number of prime numbers in a given range and returns a Task
- B: It synchronously computes the number of primes and prints them to the console
- C: It starts a new thread to calculate primes and immediately returns the result
- D: It waits for the result of prime count computation and handles exceptions
View Answer
A
Q632: How does await differ when used in methods returning Task versus methods returning void?
- A: await can be used in both types of methods, but methods returning void are often used for event handlers
- B: Methods returning Task require explicit handling of the task's result, while void does not
- C: void methods automatically handle continuations, while Task methods need manual continuation handling
- D: Methods returning Task allow for chaining continuations and error handling, while void does not
View Answer
A
Q633: What does the Dispatcher.BeginInvoke method do in the context of UI updates?
- A: It schedules an action to be executed on the UI thread, allowing UI updates from background threads
- B: It creates a new UI thread for each UI update
- C: It immediately updates the UI without marshaling
- D: It synchronizes UI updates with background threads
View Answer
A
Q634: In the example provided, why is Task.Delay used in the asynchronous method?
- A: To introduce a non-blocking delay in the execution flow of the method
- B: To block the main thread for a specified duration
- C: To pause the execution of the entire application
- D: To ensure that tasks complete before continuing execution
View Answer
A
Q635: What does the getprimescount method do in the provided code?
- A: It calculates the number of prime numbers within a specified range synchronously
- B: It asynchronously computes the prime count and returns the result
- C: It creates a new thread to handle prime number calculations
- D: It schedules prime number calculations to run at a later time
View Answer
A
Q636: How does the displayprimecounts method differ between synchronous and asynchronous implementations?
- A: The asynchronous version uses await to handle tasks without blocking the UI thread, while the synchronous version blocks
- B: The synchronous version handles tasks in parallel, while the asynchronous version runs tasks sequentially
- C: The asynchronous version executes tasks in the main thread, while the synchronous version uses background threads
- D: The synchronous version provides a better user experience due to immediate results, unlike the asynchronous version
View Answer
A
Q637: What does the async keyword indicate in a method definition?
- A: The method is asynchronous and can use await to handle tasks
- B: The method will execute synchronously regardless of await statements
- C: The method will return a Task or Task
, but await cannot be used - D: The method is intended for use in event handlers and will not return a result
View Answer
A
Q638: Why is the finally block executed after the await statement in an asynchronous method?
- A: To ensure that the finally block runs even if the asynchronous method is interrupted
- B: To guarantee that resources are cleaned up before returning from the method
- C: To prevent any exceptions from being thrown during the await operation
- D: To allow the await statement to complete before executing any additional code
View Answer
B
Q639: What is a key benefit of using async and await in modern C# programming?
- A: They simplify asynchronous code by making it easier to read and maintain
- B: They automatically optimize performance for CPU-bound tasks
- C: They eliminate the need for error handling and exception management
- D: They provide parallel processing capabilities for all types of tasks
View Answer
A
Q640: How does Task.Run handle asynchronous operations compared to directly calling a method?
- A: It schedules the method to run on a thread pool, which is efficient for asynchronous operations
- B: It executes the method synchronously and blocks until completion
- C: It creates a new thread for each asynchronous operation, regardless of resource efficiency
- D: It immediately executes the method in the main thread
View Answer
A