Swift (iOs) MCQs with answers Page - 1

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Q. Which keyword is used to declare a constant in Swift?

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

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Q. What does the following Swift code print?

Code: 
let name: String? = nil
print(name ?? "Unknown")
  • (A) nil
  • (B) Unknown
  • (C) name
  • (D) Optional("Unknown")

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

  • (A) function
  • (B) define
  • (C) func
  • (D) fn

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Q. What is the output of the following code?

Code: 
let numbers = [1, 2, 3]
print(numbers[1])
  • (A) 1
  • (B) 2
  • (C) 3
  • (D) Index out of range

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Q. What is the purpose of optionals in Swift?

  • (A) To store functions
  • (B) To allow nil values safely
  • (C) To define immutable data
  • (D) To increase performance

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Q. How do you unwrap an optional safely in Swift?

  • (A) Using * operator
  • (B) Using if let
  • (C) Using guard var
  • (D) Using throw

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Q. Which collection type in Swift does not allow duplicate values?

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

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Q. What is the result of this code?

Code: 
let result = 10 / 3
print(result)
  • (A) 3.333
  • (B) 3.0
  • (C) 3
  • (D) Error

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Q. Which operator is used for optional chaining in Swift?

  • (A) ?
  • (B) !
  • (C) ?.
  • (D) ??

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Q. What will this code print?

Code: 
var x = 5
x += 1
print(x)
  • (A) 5
  • (B) 6
  • (C) Error
  • (D) 1

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