Visual Programming MCQs with Answers
Practice important Visual Programming MCQs with answers and explanations.
Chapter: 36
Q661:
What is the purpose of the ConcurrentBag class?
A. To provide a thread-safe, unordered collection with minimal contention
B. To provide a thread-safe, ordered collection with fast lookups
C. To offer a thread-safe collection with efficient sorting capabilities
D. To ensure that all operations on the collection are synchronized and serialized
Correct Answer:
A
Chapter: 36
Q662:
How does BlockingCollection<T> handle situations when it reaches its capacity?
A. It blocks any additional add operations until items are removed from the collection
B. It discards new items when the capacity is reached
C. It automatically resizes the collection to accommodate more items
D. It throws an exception if the capacity is exceeded
Correct Answer:
A
Chapter: 36
Q663:
In the pcqueue class, what happens when you call Dispose()?
A. It marks the collection as complete, preventing any further additions and ensuring all tasks are processed
B. It deletes all tasks in the queue and clears the collection
C. It pauses all processing and waits for tasks to complete
D. It stops all tasks immediately and throws an exception
Correct Answer:
A
Chapter: 36
Q664:
What is the benefit of using ConcurrentQueue<T> over a standard Queue<T>?
A. ConcurrentQueue<T> is designed to be thread-safe and handle concurrent operations without additional locking
B. ConcurrentQueue<T> provides better performance for single-threaded operations
C. ConcurrentQueue<T> offers more features for sorting and filtering than Queue<T>
D. ConcurrentQueue<T> is optimized for disk-based storage rather than in-memory operations
Correct Answer:
A
Chapter: 36
Q665:
What does Task.Run do when used in parallel programming?
A. It schedules a task to run on a thread pool thread asynchronously
B. It executes the task immediately on the current thread
C. It creates a new thread specifically for the task
D. It blocks the current thread until the task completes
Correct Answer:
A
Chapter: 36
Q666:
How do you use Parallel.For to perform a computation that requires a local variable for each thread?
A. Use the overload that takes a local initialization function, a body function, and a local finally function
B. Use the standard Parallel.For method and initialize local variables inside the loop body
C. Use a global variable and ensure thread safety with locking mechanisms
D. Use Parallel.ForEach with an Action<T> delegate to perform the computation
Correct Answer:
A
Chapter: 36
Q667:
In which scenario would you use TaskCompletionSource<T>?
A. To manually control the completion of a task and handle results or exceptions
B. To automatically handle task completion and error handling
C. To simplify the process of creating tasks without manual intervention
D. To improve performance by avoiding the use of the await keyword
Correct Answer:
A
Chapter: 36
Q668:
How do ConcurrentStack<T> and ConcurrentQueue<T> differ in terms of item retrieval?
A. ConcurrentStack<T> retrieves items in a Last-In-First-Out (LIFO) order, while ConcurrentQueue<T> retrieves items in a First-In-First-Out (FIFO) order
B. ConcurrentQueue<T> retrieves items in a Last-In-First-Out (LIFO) order, while ConcurrentStack<T> retrieves items in a First-In-First-Out (FIFO) order
C. Both classes retrieve items in the same order, but ConcurrentStack<T> is optimized for high-concurrency scenarios
D. Both classes retrieve items in the same order, but ConcurrentQueue<T> is optimized for low-concurrency scenarios
Correct Answer:
A
Chapter: 36
Q669:
How do you handle task cancellation using a CancellationToken?
A. Pass the CancellationToken to asynchronous methods and check its status to handle cancellation
B. Use CancellationToken only in synchronous methods to cancel execution
C. Simply create a new CancellationToken for each task without passing it to methods
D. Use CancellationToken to ignore exceptions and ensure tasks always complete
Correct Answer:
A
Chapter: 37
Q670:
What is the primary purpose of JavaScript in modern web development?
A. To add interactivity and dynamic features to web pages
B. To structure the content of web pages
C. To style the appearance of web pages
D. To handle server-side logic and database interactions
Correct Answer:
A
Chapter: 37
Q671:
How did JavaScript initially differ from Java, despite the similarity in names?
A. JavaScript was originally named LiveScript and had no direct connection with Java
B. JavaScript was a server-side language while Java was client-side
C. JavaScript was designed for enterprise applications while Java was for web development
D. JavaScript was used only for basic scripting while Java was for complex programming
Correct Answer:
A
Chapter: 37
Q672:
What does jQuery primarily aim to address in JavaScript programming?
A. Complexity and browser incompatibilities
B. Performance issues in JavaScript code
C. Lack of support for animations and dynamic effects
D. Security vulnerabilities in JavaScript
Correct Answer:
A
Chapter: 37
Q673:
In HTML, what is the purpose of the <!DOCTYPE html> declaration?
A. To define the HTML version and ensure proper rendering of the document
B. To link external CSS and JavaScript files
C. To create a new HTML document with default settings
D. To specify the character encoding used in the document
Correct Answer:
A
Chapter: 37
Q674:
What is the main role of CSS in web development?
A. To control the presentation and styling of web pages
B. To handle server-side processing and database interactions
C. To manage user input and client-side interactions
D. To define the structure and layout of web pages
Correct Answer:
A
Chapter: 37
Q675:
Which of the following is NOT a valid HTML5 tag?
A. <section>
B. <font>
C. <header>
D. <article>
Correct Answer:
B
Chapter: 37
Q676:
How do you include an external JavaScript file in an HTML document?
A. Use the <script src="filename.js"></script> tag
B. Use the <link href="filename.js" rel="script"> tag
C. Use the <javascript src="filename.js"></javascript> tag
D. Use the <script src="filename.js" type="text/javascript"></script> tag
Correct Answer:
A
Chapter: 37
Q677:
What does the $(document).ready() function in jQuery do?
A. It ensures that the JavaScript code runs only after the HTML document has been fully loaded and parsed
B. It automatically handles errors in JavaScript code
C. It initiates the download of external JavaScript files
D. It optimizes the performance of JavaScript code
Correct Answer:
A
Chapter: 37
Q678:
How can you change the text color of all <h1> elements to red using CSS?
A. h1 { color: red; }
B. h1 { text-color: red; }
C. h1 { font-color: red; }
D. h1 { color: #ff0000; }
Correct Answer:
A
Chapter: 37
Q679:
What is the main advantage of using jQuery for handling events compared to plain JavaScript?
A. jQuery simplifies event handling and ensures cross-browser compatibility
B. jQuery provides better performance for event handling
C. jQuery automatically updates the DOM elements
D. jQuery eliminates the need for JavaScript event listeners
Correct Answer:
A
Chapter: 37
Q680:
What does the document.write() method do in JavaScript?
A. It writes directly to the HTML document stream
B. It outputs text to the browser console
C. It displays a pop-up alert with the provided message
D. It writes data to an external file
Correct Answer:
A