Swift MCQ (Multiple Choice Questions) With Answers, Swift Online Quiz

1 .

Who is introduced Swift?

A)

Chris Lattner

B)

Vikram Adve

C)

Steve Jobs

D)

Tanya Lattner

Correct Answer : Chris Lattner

Explanation : Development of Swift started in July 2010 by Chris Lattner, with the eventual collaboration of many other programmers at Apple. Swift took language ideas "from Objective-C, Rust, Haskell, Ruby, Python, C#, CLU, and far too many others to list".

2 .

When Swift was initially Released?

A)

June 2, 2012

B)

June 2, 2013

C)

June 2, 2014

D)

June 2, 2015

Correct Answer : June 2, 2014

Explanation : Swift is a general-purpose, multi-paradigm, compiled programming language developed by Apple Inc. and the open-source community. First released in June 2, 2014, Swift was developed as a replacement for Apple's earlier programming language Objective-C, as Objective-C had been largely unchanged since the early 1980s and lacked modern language features.

3 .

What are the features of Swift Programming?

A)

Arrays and integers are checked for overflow

B)

It eliminates the classes that are in an unsafe mode

C)

Switch function can be used instead of using â€œifâ€ statement

D)

All of the above

Correct Answer : All of the above

4 .

Which Of The Following Framework Is Not Used In IOS?

A)

AppKit Framework

B)

UIKit Framework

C)

Foundation Framework

D)

CoreMotion Framework

Correct Answer : AppKit Framework

5 .

Which command is used to turn the switch on?

A)

toggle( )

B)

toggleSwitch( )

C)

onSwitch( )

D)

activateSwitch( )

Correct Answer : toggleSwitch()

6 .

What is swift playground?

A)

Is a algorithmic designer tools

B)

Advanced tool to create applications

C)

A tool Used to write a pseudo code for any program

D)

Powerful programming language created by Apple

Correct Answer : Powerful programming language created by Apple

7 .

What is the meaning of question mark "?" in Swift?

A)

used in loop declaration

B)

used in function declaration

C)

used in property declaration

D)

used in parameter declaration

Correct Answer : used in property declaration

Explanation : In Swift, question mark "?" is used in property declaration. It tells the compiler that this property is optional. The property may hold a value or not.

8 .

How can you make a property optional in Swift?

A)

You have to declare a question mark ? in the code to make a property optional

B)

You have to declare a question mark & in the code to make a property optional

C)

You have to declare a question mark ?? in the code to make a property optional

D)

None of the above

Correct Answer : You have to declare a question mark ?? in the code to make a property optional

Explanation : We have to declare a question mark ?? in the code to make a property optional. If a property doesn't have a value, then the symbol ? helps to avoid the runtime error.

9 .

The expression that creates a closure in Swift is called ____ in other languages it is also called a Lambda or Anonymous Function.

A)

Control

B)

Defined

C)

Parameter

D)

Closure Expression

Correct Answer : Closure Expression

10 .

What does the question mark (?) indicate A particular property is

A)

Optional

B)

Missing

C)

Changed

D)

Necessary

Correct Answer : Optional

11 .

What are the common execution states in iOS?

A)

Active

B)

Inactive

C)

Not running

D)

All of the above

Correct Answer : All of the above

12 .

Swift is which type of language?

A)

Scripting Language

B)

Type-safe language

C)

Object-oriented programming language

D)

All of the above

Correct Answer : All of the above

13 .

What are the collection types in Swift?

A)

Array and library

B)

Dictionary and array

C)

Dictionary and library

D)

Library, dictionary and array

Correct Answer : Dictionary and array

14 .

Given : var stringValue:String = "Somthing". What is the result of stringValue = nil?

A)

stringValue == nil

B)

stringValue == "Somthing"

C)

the compiler won't allow it

D)

None of the above

Correct Answer : the compiler won't allow it

15 .

Which of the following is not a literals in swift?

A)

Quad Literals

B)

Binary Literals

C)

Decimal Literals

D)

Hexadecimal Literals

Correct Answer : Quad Literals

Explanation :

Quad Literals is not a literals in swift.

16 .

Numbers with decimal values or fractional components are called?

A)

integer number

B)

floating numbers

C)

decimal number

D)

All of the above

Correct Answer : floating numbers

Explanation : Numbers with decimal values or fractional components are called floating numbers. For example: 1.34 is a floating point number. Floating point types can represent a wider range of values than integer types.

17 .

Which of the following features of Swift programming language?

A)

Automatic memory management

B)

Swift follows Objective-C like syntax

C)

Swift is very easy to learn and precise to use

D)

All of the above

Correct Answer : All of the above

Explanation : All of the above are features of Swift programming language.

18 .

In Swift programming language, single-line comments are started with _______?

A)

Hash

B)

Asterisk

C)

Single Slashes

D)

Double Slashes

Correct Answer : Double Slashes

Explanation : In Swift programming language, single-line comments are started with double slashes

19 .

_________ is a hierarchy of objects that obtain the opportunity to respond to the events.

A)

Dictionary

B)

Regular Expression

C)

Responder Chain

D)

None of the above

Correct Answer : Responder Chain

Explanation : Responder Chain : Responder Chain is a hierarchy of objects that obtain the opportunity to respond to the events.

20 .

Constants are declared by using _____ keyword and variables by _______ keyword.

A)

let, var

B)

let, let

C)

var, let

D)

var, var

Correct Answer : let, var

Explanation : Constants are declared by using let keyword and variables by var keyword.

21 .

________ is a process of querying and calling properties

A)

Swift Chaining

B)

Optional Chaining

C)

Lazy Chaining

D)

All of the above

Correct Answer : Optional Chaining

Explanation : In Swift programming language, Optional Chaining is a process of querying and calling properties. You can chain multiple queries together, but if any link in the chain is nil then, the entire chain fails.

22 .

How many types of classes in Inheritance in Swift?

A)

1

B)

2

C)

3

D)

4

Correct Answer : 2

Explanation : There are two types of classes in Inheritance in Swift : Sub class and Super class

23 .

What type of integer is denoted by "Int8"?

A)

Close

B)

Open

C)

Unsigned

D)

Signed

Correct Answer : Signed

24 .

What's are the new features in Swift 4.0?

A)

Aster, easier to use Strings that retain Unicode correctness

B)

Added some enhancements to creating a dictionary and Set types

C)

Smart key paths for type-safe, efficient, extensible key-value coding for Swift types

D)

All of the above

Correct Answer : All of the above

25 .

The class which inherits the properties from other class is called child class or sub class

A)

Ture

B)

False

C)

Can be True or False

D)

Can not say

Correct Answer : True

26 .

Which Of The Following Is Incorrect Value Type Of The Swift?

A)

Enum

B)

Double

C)

Class

D)

Character

Correct Answer : Class

27 .

Which Of The Following Is Incorrect Data Type In SWIFT ?

A)

Char

B)

UInt

C)

Double

D)

Optional

Correct Answer : Char

28 .

How many varieties of collection types in Swift?

A)

5

B)

4

C)

3

D)

2

Correct Answer : 2

Explanation : There are two varieties of collection types in Swift: Array and Dictionary.

29 .

The IDE Used In Swift Is______

A)

Ld

B)

Xcode

C)

Gas

D)

Swiftc

Correct Answer : Xcode

30 .

To Create Constants In Swift We Use Keyword_____

A)

Conts

B)

Let

C)

Contants

D)

None Of The Above

Correct Answer : Let

31 .

The Most Recent Version Of MacOS Is Based On____?

A)

CMOS

B)

LINUX

C)

UNIX

D)

WINDOWS

Correct Answer : UNIX

32 .

What Is A LLVM?

A)

Swiftc Compiler

B)

Objective C Compiler

C)

Contains Both Compiler (swiftc And Objective C)

D)

None of the above

Correct Answer : Contains Both Compiler (swiftc And Objective C)

33 .

Which Of The Following Declares A Mutable Array In Swift?

A)

Let X=[Int]

B)

Var X=[Int]

C)

Let X =[Int]()

D)

Var X=[Int]()

Correct Answer : Var X=[Int]()

34 .

We Can Return Multiple Values In Swift From Function By Using?

A)

Tuple

B)

Array

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Tuple

35 .

What are the control transfer statements used in Swift?

A)

Break

B)

Continue

C)

Fallthrough

D)

All of the above

Correct Answer : All of the above

36 .

What are the characteristics of Switch in Swift?

A)

It supports any kind of data, and not only synchronize but also checks for equality

B)

Switch statement must be exhaustive, which means that you have to cover all possible values for your variable

C)

When a case is matched in switch, the program exits from the switch case and does not continue checking the next cases. So you donâ€™t need to explicitly break out the switch at the end of case

D)

All of the above

Correct Answer : All of the above