Swift (iOs) MCQs with answers Page - 8

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

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

A

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Q. What type of value does `Bool.random()` return?

  • (A) true
  • (B) false
  • (C) Random Bool value
  • (D) Int

A

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Q. What is the type of `let a = 3.14` in Swift?

  • (A) Float
  • (B) Double
  • (C) Int
  • (D) Decimal

A

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Q. How do you make a property read-only in Swift?

  • (A) By using let
  • (B) By using private
  • (C) By using get-only computed property
  • (D) By using final

A

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Q. What is the purpose of the `didSet` observer in Swift?

  • (A) To observe a property before it's set
  • (B) To call a function when a class is initialized
  • (C) To run code after a property’s value is changed
  • (D) To override a property

A

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Q. Which of the following is a correct computed property?

  • (A) var name = "John"
  • (B) var age: Int = 25
  • (C) var area: Int { return width * height }
  • (D) let value = ()

A

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Q. What does the nil coalescing operator `??` do?

  • (A) Returns true if both are nil
  • (B) Unwraps optional or provides default value
  • (C) Checks for nil only
  • (D) Replaces nil with 0

A

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Q. Which Swift keyword is used to define a fallback in case of failure?

  • (A) guard
  • (B) throw
  • (C) catch
  • (D) do

A

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Q. What will the following code print?

Code: 
let list = ["a", "b", "c"]
if list.contains("b") {
 print("Found") }
  • (A) true
  • (B) Found
  • (C) false
  • (D) Error

A

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Q. What will this Swift code output?

Code: 
let a = 7
let b = 3
print(a % b)
  • (A) 2
  • (B) 1
  • (C) 0
  • (D) 4

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