Which keyword is used to declare a constant in Swift?

• var
• let
• const
• constant

What is the default value of an uninitialized optional variable in Swift?

• nil
• 0
• undefined
• empty string

Which data type is used to represent true or false values in Swift?

• Bool
• Boolean
• Int
• Binary

Which operator is used for string interpolation in Swift?

• {}
• ()
• []
• \()

What is the correct syntax to declare an array in Swift?

• let arr = []
• let arr: [Int] = []
• array arr = []
• var arr = list()

What is the primary difference between a struct and a class in Swift?

• Classes are value types, structs are reference types
• Structs are value types, classes are reference types
• They are identical
• Structs cannot have methods

Which keyword is used to define a protocol in Swift?

• protocol
• interface
• abstract
• proto

Which initializer is guaranteed to initialize all properties before use?

• Designated initializer
• Convenience initializer
• Default initializer
• Optional initializer

Which access level makes an entity available only within the same source file?

• private
• internal
• fileprivate
• protected

Which statement is used to match multiple cases in a switch statement?

• case A, B:
• case A and B:
• case A or B:
• case A|B:

Which concurrency model was introduced in Swift 5.5?

• Threads
• Async/Await
• Actors
• Coroutines

What is an actor in Swift?

• A design pattern
• A reference type that protects mutable state
• A struct that runs async code
• A UI element

Which framework provides reactive programming in Swift?

• ReactiveSwift
• Combine
• RxSwift
• Streams

Which SwiftUI property wrapper stores a value type in a view?

• @State
• @Binding
• @ObservedObject
• @Environment

Which keyword suspends execution until a task completes?

• await
• async
• pause
• yield