Objective Questions in Swift2.2 @iPhone - Set C

     

Q.21 : var arr = [4,5,6,7,”Ravi"]  

           Is a

A.         Valid Declaration and Initialization of an Array

B.         Compile Time Error

C.         Run Time Error

D.        None of the Above

Q.22 : What will be the output

          var array  = [11,22,33,44,55]

          print(array.length)          

A.         Compile Time Error

B.         Run Time Error

C.         5

D.        None of the above

Q.23 : What will be the output

           var array  = [11,22,33,44,55]

           print(array.count)

    A.         Compile Time Error

B.       Run Time Error

C.         5

D.       None of the above

Q.24 Which syntax is valid for array declaration

A.        var arr : Array

B.        var arr : NSArray

C.        Both

D.        None

Q.25: What will be the output

          var array  = [11,22,33,44,55]

         print(array[3])

          

A.         Compile Time Error

B.         33

C.         44

D.        22

Q.26:  What will happen

          var array  = [11,22,33,44,55]

          array.append(1)

          print(array)

          

A.         Compile Time Error

B.         [11,22,33,44,55,1]

C.         [11,22,33,44,1]

D.        [1]

Q.27: What will be the output

          var array  = [11,22,33,44,55]

          array.removeAtIndex[2]

          print(array)

          

A.         Compile Time Error

B.         [11,22,33,55]

C.         [11,22,44,55]

D.        [11,22,33,44]

Q.28: What will be the output

          var array  = [111,22,33,404,-55]

          array.sort()

          print(array)

          

A.         Compile Time Error

B.         [22,33,111,404,-55]

C.         [-55,22,33,111,404]

D.        [111,22,33,404,-55]

Q.29: Which syntax is valid for Dictionary

     

      A.  var dictionary : NSDictionary

      B. var dictionary : Dictionary

      C. Both

      D. None

Q.30 What will be the output

        var dictionary = [“Android” : “Mobile OS”, ”Chess” :       

                                      ”Game”, ”Ravi” : “Trainer”]

       print(dictionary[“Ravi”])

A.         Mobile OS

B.         Game

C.         Trainer

D.        Compile Time Error

Answers   A     A    C     B     C     B    C    C    A    C 

Objective Questions in Swift2.2 @iPhone - Set B

Q.11 : Which is the correct syntax to declare constant in swift

A. var x = 10

B. let x = 10

C. Const x = 10

D. None of the above  

Q.12 : var red , green ,blue : Double

A. It will create 3 variables of Double type

B. Compile time Erroe

C. Run time error

D. None of the above

Q.13: Which is wrong syntax

A. let x = 10

B. let  na me = “Ravi”

C.  let Õ  = 10    

D. Both B & C

Q.14 :  Compare the below declaration syntax

         1. let array : Array <String> = [ “ Ravi “ , “Kumar”, ”Godara”]

         2. let array :     [String]          =  [ “ Ravi “ , “Kumar”, ”Godara”]

A. Syntax 1 is not valid

B. Syntax 2 is not valid

C. Both can be used to declare String Array

D. Both syntax wrong

Q.15 : Compare the below declaration syntax

         1. let dictionary : [String : Int] = [“Ravi” : 30, “Raj” : 35]

         2. let dictionary : Dictionary<String , Int> =  [“Ravi” : 30, “Raj” : 35]

A. Both can be used to declare String Array

B. Syntax 1 is not valid

C. Syntax 2 is not valid

D. Both syntax wrong

Q.16:Compare the below declaration syntax

         1. var  optional :  Int?

         2. var  optional :  Optional<Int>

A. Syntax 1 is not valid

B. Syntax 2 is not valid

C. Both can be used to declare String Array

D. Both syntax wrong

Q.17: Compare the below declaration syntax

         1. var  a=10 ,b=20 ,c=30

         2. let  a=10 ,b=20 ,c=30

A. Syntax 1 is not valid

B. Syntax 2 is not valid

C. Both can be used to declare String Array

D. Both syntax wrong

Q.18: What will be the output

let row : Int = 3

      row  = 5

     A.         value of row is 5

     B.         Compile time error

     C.         value of row is 3

     D.        None of the above  

Q.19 : What will be the output

var int  : Int = 20

var dec : Double = 15.6

int = dec

     A.         int will be 15

     B.         int will be 16

     C.         int will be 15.6

     D.        Compile time error

Q.20 : What will be the output

var int  : Int = 20

var dec : Double = 15.6

int = Int(dec)

    A.         int will be 15

    B.         int will be 16

    C.         int will be 15.6 

    D.        Compile time error

   Answers     B     A    B     C    A     C     C      B     D     A