Visual Programming MCQs with Answers
Practice important Visual Programming MCQs with answers and explanations.
Chapter: 45
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
Correct Answer:
B
Chapter: 45
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
Correct Answer:
A
Chapter: 45
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
Correct Answer:
B
Chapter: 45
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
Correct Answer:
A
Chapter: 45
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++
Correct Answer:
C
Chapter: 45
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
Correct Answer:
A
Chapter: 45
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
Correct Answer:
A
Chapter: 45
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
Correct Answer:
A
Chapter: 45
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
Correct Answer:
C