Swift (iOs) MCQs with answers Page - 12

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. Which of the following is true about tuples in Swift?

  • (A) Tuples can have different types
  • (B) Tuples must have the same type
  • (C) Tuples are immutable
  • (D) Tuples are classes

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Q. Which of the following is the correct syntax for a function that throws an error?

  • (A) func test() throws -> Void
  • (B) func test() throw -> Void
  • (C) func test() throws -> Error
  • (D) func test() throw Void

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Q. How do you provide a fallback value for an optional?

  • (A) Using ||
  • (B) Using ??
  • (C) Using ?
  • (D) Using if-else

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Q. What does the `@available` attribute do in Swift?

  • (A) Marks a property private
  • (B) Restricts a function to certain platforms or versions
  • (C) Creates a computed property
  • (D) Specifies memory management

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Q. Which of these statements about optionals is true?

  • (A) An optional must have a value
  • (B) Optionals cannot be nil
  • (C) Optionals can be nil or have a value
  • (D) Optionals are always unwrapped automatically

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Q. Which of the following is a correct way to declare a computed read-only property?

  • (A) var square = side * side
  • (B) var square: Int { return side * side }
  • (C) let square = side * side
  • (D) var square() -> Int

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Q. What does the `guard` statement do?

  • (A) Exits the current scope if the condition is false
  • (B) Continues the loop
  • (C) Skips optional binding
  • (D) Throws an error

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Q. Which function is used to sort an array in Swift?

  • (A) sortArray()
  • (B) sorted()
  • (C) arrange()
  • (D) filter()

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Q. Which of the following is used to check if a value is of a certain type?

  • (A) as
  • (B) is
  • (C) typeof
  • (D) instanceof

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Q. Which keyword is used in Swift to prevent a method from being overridden?

  • (A) static
  • (B) final
  • (C) private
  • (D) sealed

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