Swift (iOs) MCQs with answers Page - 10

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 of these is NOT a valid Swift access modifier?

  • (A) internal
  • (B) public
  • (C) private
  • (D) sealed

A

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Q. Which Swift collection type uses key-value pairs?

  • (A) Set
  • (B) Tuple
  • (C) Dictionary
  • (D) Array

A

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Q. How do you create a range from 1 to 4, excluding 4?

  • (A) 1 to 4
  • (B) 1...4
  • (C) 1..<4
  • (D) [1,4)

A

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Q. What is the default value of a Boolean in Swift?

  • (A) true
  • (B) false
  • (C) nil
  • (D) 0

A

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Q. Which of the following declares an empty dictionary?

  • (A) let dict = Dictionary<String, Int>()
  • (B) let dict = {}
  • (C) let dict = [String: Int: String]()
  • (D) let dict = [String, Int]()

A

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Q. Which of these is used for method overriding in Swift?

  • (A) override
  • (B) overload
  • (C) virtual
  • (D) extends

A

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Q. Which keyword is used to handle errors in Swift?

  • (A) catch
  • (B) handle
  • (C) try
  • (D) throw

A

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Q. How do you define a tuple with named elements?

  • (A) let person = ("John", 25)
  • (B) let person = [name: "John", age: 25]
  • (C) let person = (name: "John", age: 25)
  • (D) let person = person(name: "John", age: 25)

A

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

  • (A) To make variables immutable
  • (B) To return values from a function
  • (C) To pass by reference
  • (D) To initialize optional values

A

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Q. What does `@State` in SwiftUI signify?

  • (A) A constant value
  • (B) An immutable variable
  • (C) A property that can change and is watched by the view
  • (D) A global variable

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