Scala For Big Data Set 2

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Free Online Best Scala For Big Data MCQ Questions for improve your basic knowledge of Scala For Big Data. This Scala For Big Data set 2 test that contains 25 Multiple Choice Questions with 4 options. You have to select the right answer to a question.

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Question 1

Which of the following statements are true about Either?

A	It is a sealed abstract class
B	We can use it to deal with possible missing values
C	An instance of Either can be an instance of Left or Right
D	All of the above

Question 2

Select the correct value specified by the following line of code____ “abcde” ensuring (_.length>3)

A	abc
B	abcd
C	abcde
D	The code throws an error

Question 3

Which of the following is true about Scala and Java?

A	Both work with popular IDEs like Eclipse, Netbeans, and IntelliJ
B	Both run on the JVM
C	We can call Scala from Java and Java from Scala
D	All of the above

Question 4

Looking at the previous code, can you predict the output of the following code? val stuff=collection.mutable.Buffer(“blue”) stuff+=44 println(stuff)

A	ArrayBuffer(blue, 44)
B	ArrayBuffer(blue)
C	Something else
D	The code throws an error

Question 5

Scala is a portmanteau for____

A	Scalar and Language
B	Script and Language
C	Sequential and Language
D	Scalable and Language

Question 6

The following technique/construct lets us transform a function with multiple arguments into a chain of functions____

A	Extractors
B	Traits
C	Trait mixins
D	Currying

Question 7

Is the following function pure? def change:Unit={ x=x+10 }

A	It is pure
B	It is not pure
C	can not say
D	some time

Question 8

Select the correct output for the following code____ object Flash{ def superpower=”speed” }

A	This prints “speed”
B	This prints nothing
C	This throws an error
D	None of the above

Question 9

How do you abruptly stop execution in the REPL?

A	Pressing Ctrl+C
B	Pressing Ctrl+Q
C	Pressing Ctrl+W
D	All of the above

Question 10

Which is the correct value of the following expression? List(1,2,3)flatMap(x=>List(x,4))

A	List(1,2,3,4)
B	List(1,4,2,4,3,4)
C	List(4,4,4)
D	List (1,2,3,x,4)

Question 11

Which of the following statements is untrue about a functor in Scala?

A	It is a mapping between categories
B	It is a built-in construct in Scala
C	It maps objects or entities of one category to those of another
D	All of the above

Question 12

For which kind of data should you use a case class?

A	Mutable data
B	Immutable data
C	both a and b
D	None of the above

Question 13

Select the Scala construct that holds pairwise different elements of the same type_____

A	Sets
B	Groups
C	Forums
D	Maps

Question 14

Select the correct output___ val cool=Map(“a”->”aaa”, “b”->”bbb”, “a”->”ccc”) println(cool(“a”))

A	"a"
B	"aaa"
C	"bbb"
D	"ccc"

Question 15

Choose the correct output for the following code____ val x:Option[String]=Some(“hi”) println(x.get)

A	This prints Some(“hi”)
B	This prints nothing
C	The code throws an error
D	This prints “hi”

Question 16

Choose the correct output__ object Dog{ def bark=”woof” }

A	It prints “woof”
B	It prints nothing
C	It raises an exception
D	None of the above

Question 17

Select the correct output: val numbers=List(11,22,33) var total=0 for(i<-numbers){ total+=I } println(total)

A	33
B	22
C	11
D	66

Question 18

Scala is also a_____

A	Style Sheets Language
B	Scripting Language
C	Cloud Computing Language
D	All of the above

Question 19

Its Java compatibility makes Scala suitable for____

A	Android Development
B	Apple Development
C	Microsoft Development
D	Google Development

Question 20

Select appropriate output___ def quadruple(x:Int):Int=x*4 val quadrupleCopy=quadruple _ println(quadrupleCopy(-1))

A	-4
B	4
C	20
D	The code throws an error

Question 21

What does this code print? var y:Option[String]=None y.get

A	This prints None
B	This prints nothing
C	This throws an exception
D	None of the above

Question 22

Select the correct output for the following code_____ var band={ var name=”sublime” name } println(name)

A	It prints “sublime”
B	It prints nothing
C	The code raises an error
D	syntax error

Question 23

Select the true statements from the following____

A	All of the above
B	A Future is an object
C	A Future holds a value that may become available at a later point in time
D	We can complete a promise only once

Question 24

Select the correct output for the following code__ val leaders=collection.mutable.Buffer(“Reykon”) leaders+=”obama” println(leaders)

A	ArrayBuffer(Reykon, Obama)
B	ArrayBuffer(Reykon)
C	List(Reykon, obama)
D	The code throws an error

Question 25

Decide what the following code prints___ val odds=List(3,5,7) var result=1 odds.foreach((num:Int)=>result*=num) println(result)

A	1
B	105
C	List(105)
D	List(3,5,7)

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