Swift (iOs) MCQs with answers Page - 11

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. Which Swift keyword is used to declare a constant?

  • (A) const
  • (B) let
  • (C) final
  • (D) immutable

A

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Q. What is the result of the expression `true && false || true`?

  • (A) false
  • (B) true
  • (C) Error
  • (D) nil

A

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Q. What is the result of `Double("abc")` in Swift?

  • (A) 0.0
  • (B) abc
  • (C) nil
  • (D) Error

A

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Q. Which of the following is the correct way to declare an optional integer?

  • (A) var age = ?Int
  • (B) var age: Int?
  • (C) var age: Optional<Int>
  • (D) Both 2 and 3

A

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Q. What will the following Swift code print?

Code: 
let name = "Swift"
print(name.lowercased())
  • (A) SWIFT
  • (B) swift
  • (C) Swift
  • (D) sWIFT

A

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Q. Which of these is a correct way to create a set in Swift?

  • (A) var mySet = Set()
  • (B) var mySet = Set<Int>()
  • (C) var mySet = [Int]()
  • (D) var mySet = Dictionary()

A

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Q. What is the purpose of `map` in Swift?

  • (A) To filter values in a list
  • (B) To transform values in a list
  • (C) To reduce a list to one value
  • (D) To sort the list

A

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Q. What will this Swift code output?

Code: 
let a = 3
let b = 3.0
print(Double(a) == b)
  • (A) true
  • (B) false
  • (C) Error
  • (D) nil

A

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Q. Which keyword is used to stop a loop early?

  • (A) stop
  • (B) end
  • (C) break
  • (D) exit

A

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Q. What does `lazy` mean in property declaration?

  • (A) It can never be initialized
  • (B) It is loaded at compile time
  • (C) It is initialized only when used
  • (D) It cannot be used with constants

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