Swift (iOs) MCQs with answers Page - 4

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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Ravina • 3.96K Points
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Q. What is the output of the code below?

Code:

let str = "Hello"
print(str.uppercased())

(A) hello
(B) HELLO
(C) Hello
(D) error

R

Ravina • 3.96K Points
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Q. Which of the following is a correct way to define an enum in Swift?

(A) enum Color { red, green, blue }
(B) enum Color = [red, green, blue]
(C) enum Color: [String] = ["red", "green"]
(D) enum Color: String { case red, green, blue }

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Ravina • 3.96K Points
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Q. What is the default value of an optional variable in Swift?

(A) null
(B) nil
(C) 0
(D) undefined

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Q. Which Swift keyword is used to inherit from a superclass?

(A) implements
(B) inherits
(C) extends
(D) override

R

Ravina • 3.96K Points
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Q. Which of the following represents a computed property in Swift?

(A) var area = width * height
(B) let area = width * height
(C) var area: Int { return width * height }
(D) func area() -> Int

R

Ravina • 3.96K Points
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Q. Which of these is used to define a protocol in Swift?

(A) interface
(B) protocol
(C) delegate
(D) abstract

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Ravina • 3.96K Points
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Q. What will this code output?

Code:

let name = "Swift"
for char in name {
 print(char)
}

(A) S w i f t
(B) Swift
(C) Each character on a new line
(D) Error

R

Ravina • 3.96K Points
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Q. What is the purpose of the `lazy` keyword in Swift?

(A) To delay initialization until first use
(B) To create optional properties
(C) To mark properties as final
(D) To improve performance by skipping values

R

Ravina • 3.96K Points
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Q. What is true about closures in Swift?

(A) They are used only inside loops
(B) They are reference types
(C) They cannot capture variables
(D) They don’t support return values

R

Ravina • 3.96K Points
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Q. Which of the following is NOT a Swift data type?

(A) String
(B) Int
(C) Real
(D) Bool

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