Swift (iOs) MCQs with answers Page - 15

Here, you will find a collection of MCQ questions on Swift (iOs). Go through these questions to enhance your preparation for upcoming examinations and interviews.

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A

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Q. What will the following code print?

Code:
let greeting = "Hello"
print(greeting.uppercased())
  • (A) HELLO
  • (B) hello
  • (C) Hello
  • (D) Error

A

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Q. Which of the following is the correct way to define a generic function in Swift?

  • (A) func add<T>(a: T, b: T) -> T
  • (B) function add<T>(T a, T b): T
  • (C) generic add(a, b): T
  • (D) func<T> add(a: T, b: T): T

A

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Q. Which Swift data type represents a type with no value?

  • (A) Any
  • (B) Void
  • (C) Empty
  • (D) None

A

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Q. What does `@main` do in Swift?

  • (A) Specifies the main view in SwiftUI
  • (B) Specifies the main function in a program
  • (C) Defines a main module
  • (D) Marks a test case

A

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Q. What is the output of this code?

Code:
let array = [1, 2, 3, 4]
print(array[2])
  • (A) 2
  • (B) 3
  • (C) 4
  • (D) 1

A

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Q. Which keyword is used to define a subclass in Swift?

  • (A) extends
  • (B) inherits
  • (C) subclass
  • (D) :

A

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Q. What will this code print?

Code:
let str: String? = nil
print(str ?? "Default")
  • (A) nil
  • (B) Optional(nil)
  • (C) Default
  • (D) Error

A

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Q. Which of these is NOT a valid Swift literal?

  • (A) "Hello"
  • (B) true
  • (C) 3.14
  • (D) char

A

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Q. How do you write a comment that spans multiple lines in Swift?

  • (A) // comment
  • (B) /* comment */
  • (C) # comment
  • (D) -- comment

A

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Q. Which function returns the index of the first matching element?

  • (A) firstIndex(of:)
  • (B) indexOf()
  • (C) getIndex()
  • (D) find()

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