HackerEarth Multiple choice questions for iOS (Part 1)
Question 1: What is the purpose of using Auto Layout in iOS development?
Options:
a) Auto Layout is used to create custom user interface controls in iOS.
b) Auto Layout is a framework for handling user input and touch events.
c) Auto Layout is used for positioning and sizing user interface elements dynamically.
d) Auto Layout is a networking framework used for making HTTP requests.
Answer: c) Auto Layout is used for positioning and sizing user interface elements dynamically.
Question 2: What is the purpose of delegates in iOS development?
Options:
a) Delegates are used for creating user interfaces and handling UI events.
b) Delegates provide a way to perform background tasks asynchronously.
c) Delegates facilitate communication and data passing between objects.
d) Delegates are used for managing data persistence in Core Data.
Answer: c) Delegates facilitate communication and data passing between objects.
Question 3: Which of the following frameworks in iOS is used for creating user interfaces?
Options:
a) UIKit
b) CoreData
c) CoreLocation
d) AVFoundation
Answer: a) UIKit
Question 4: Which of the following is true about the iOS development framework SwiftUI?
Options:
a) SwiftUI is only compatible with iOS 14 and above.
b) SwiftUI uses a declarative syntax for building user interfaces.
c) SwiftUI is a hybrid framework that combines elements of UIKit and AppKit.
d) SwiftUI is exclusively used for building macOS applications.
Answer: b) SwiftUI uses a declarative syntax for building user interfaces.
Question 5: Which of the following is a benefit of using Auto Layout in iOS development?
Options:
a) Auto Layout simplifies the process of handling user input events.
b) Auto Layout improves app performance by reducing memory usage.
c) Auto Layout provides a responsive user interface across various device screen sizes.
d) Auto Layout enables direct manipulation of graphical assets in the app.
Answer: c) Auto Layout provides a responsive user interface across various device screen sizes.
Question 6: What is the purpose of the delegate pattern in iOS?
Options:
a) To define a set of rules and requirements for interacting with a specific object or protocol.
b) To create a strong reference between objects to avoid memory leaks.
c) To encapsulate related properties and methods within a class or struct. d) To provide a mechanism for handling asynchronous operations using closures.
Answer: a) To define a set of rules and requirements for interacting with a specific object or protocol.
Question 7: Which of the following is true regarding the concept of memory management in iOS?
Options:
a) iOS uses Automatic Reference Counting (ARC) to manage memory automatically.
b) Manual memory management is required in iOS to handle memory deallocation.
c) Memory management is handled by the operating system, and developers have no control over it.
d) iOS uses garbage collection for memory management, similar to other programming languages.
Answer: a) iOS uses Automatic Reference Counting (ARC) to manage memory automatically.
Question 8: Which of the following is true about Swift Optionals?
Options:
a) Optionals can only contain non-nil values.
b) Optionals are used to handle errors and exceptions in Swift.
c) Optionals are denoted by a “?” symbol in Swift.
d) Optionals are automatically unwrapped when accessing their value.
Answer: c) Optionals are denoted by a “?” symbol in Swift.
Question 9: Which of the following is true about the Main Thread (UI Thread) in iOS?
Options:
a) The Main Thread is responsible for executing time-consuming tasks to avoid blocking the UI.
b) All UI updates and user interactions must happen on the Main Thread.
c) Background tasks can be performed directly on the Main Thread without any impact on UI responsiveness.
d) The Main Thread is automatically created and managed by the operating system and cannot be accessed directly.
Answer: b) All UI updates and user interactions must happen on the Main Thread.
Question: Which of the following is NOT a valid data storage option in iOS?
Options:
a) UserDefaults
b) SQLite
c) Core Data
d) HTTP Cookies
Answer: d) HTTP Cookies
