Visual Programming MCQs with Answers
Practice important Visual Programming MCQs with answers and explanations.
Multiple Choice Questions
Q801: How does the hasFileAlreadyBeenCreated method determine if a file exists?
- A: By checking if the file manager has created the file
- B: By checking if the file exists at the specified path
- C: By verifying if the file path is valid
- D: By checking if the file is accessible on the network
View Answer
B
Q802: How does the code handle the creation and saving of 10,000 random numbers?
- A: By generating the numbers in a background thread and saving them to disk
- B: By creating the numbers in the main thread and displaying them directly
- C: By generating the numbers synchronously in the main thread
- D: By creating the numbers in a background thread and saving them to a local file
View Answer
A
Q803: What is the purpose of sorting the random numbers in the code?
- A: To refresh the UI with the sorted numbers
- B: To ensure the numbers are displayed in ascending order
- C: To save the sorted numbers to a file
- D: To prepare the numbers for a statistical analysis
View Answer
B
Q804: What is a key benefit of using dispatch queues in GCD?
- A: Managing multiple tasks simultaneously
- B: Executing tasks sequentially on the main thread
- C: Ensuring tasks are executed on a single thread
- D: Synchronizing access to shared resources
View Answer
A
Q805: What are some of the topics covered in the course overview?
- A: Web development with HTML, CSS, and JavaScript
- B: Object-oriented programming in Java
- C: Data binding and resources in XAML
- D: Memory management in C++
View Answer
C
Q806: How is the image displayed to the user in the given code?
- A: By creating a UIImageView and adding it to the view controller’s view
- B: By directly setting the image in the main view
- C: By using a UIView to display the image directly
- D: By creating a UIButton and setting the image as its background
View Answer
A
Q807: What does dispatch_after do in Grand Central Dispatch?
- A: Executes a block of code after a specified delay
- B: Immediately executes a block of code
- C: Cancels the execution of a previously scheduled block
- D: Executes a block of code on the main thread
View Answer
A
Q808: What is one of the benefits of using Dispatch_queue_t?
- A: Allows concurrent execution of tasks across multiple threads
- B: Manages memory allocation for tasks
- C: Synchronizes tasks on the main thread
- D: Directly interacts with the user interface
View Answer
A
Q809: What type of resource management is discussed in the course overview?
- A: Memory management in C++
- B: Resource binding in JavaScript
- C: Data binding and resources in XAML
- D: Handling resources in Objective-C
View Answer
C