Scala For Big Data Set 1

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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 1 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 will compile and run?

A	var msg="Testing" println(msg+" a test")
B	val msg:String = "Testing" println(msg+" a horse ");
C	val msg='Testing' println(msg=msg+Testing)
D	var msg="Testing" println("msg is :"+(msg=msg+" " +msg)

Question 2

We use the following keyword to define a function in Scala____

A	def
B	func
C	function
D	We use the data type instead

Question 3

A FUNCTOR must have_____

A	map function
B	flatMap function
C	map and flatMap both
D	None of the above

Question 4

Which One of the following is an erroneous function definition?

A	def functionName(x:Int,y:Int):Int=x+y
B	def functionName(x:Int,y:Int):Int={return x+y}
C	def functionName(x:Int,y:Int):Int{x+y} ()
D	def functionName(x:Int,y:Int)={x+y}

Question 5

What is Scala?

A	Programming language
B	Framework
C	Platform
D	None of the above

Question 6

The ways in which Scala language is deployed in real-world scenarios are_____

A	Writing web applications
B	Applications working with streaming data
C	Concurrency and distributed applications
D	All of the above

Question 7

Scala is a short form of____

A	Scalable language
B	Sequential language
C	Script language
D	Scalar language

Question 8

What is advantages of Scala?

A	Less error prone functional style
B	High maintainability and productivity
C	High scalability
D	All of the Above

Question 9

Consider the following statements about vals and vars___

A	val is a constant
B	Reassigning to a val throws an error
C	Reassigning to a var doesn’t throw an error
D	All of the above

Question 10

Scala programming language is invented by___

A	Mr. Martin Odersky
B	James Gosling
C	Dennis Richie
D	None of the above

Question 11

Programming language which uses both object-oriented programming and functional programming paradigms is____

A	Scala
B	Ada
C	Pascal
D	Machine language

Question 12

What are the Scala variables?

A	var myVar : Int=0;
B	val myVal: Int=1;
C	both a and b
D	None of the above

Question 13

How should we end a stream to calculate sum of elements?

A	Sink.sum_
B	Sink.fold[Int, Int](0)(_ + _)
C	Sink.sum[Int](_)
D	Sink.map(_ + _)

Question 14

What are the few collections in Scala?

A	Array
B	List
C	Sets
D	All of the above

Question 15

What is Scala’s programming paradigm?

A	oops
B	Statically-Typed
C	Functional
D	All of the Above

Question 16

Which of the following is true about Scala type inference ?

A	The data type of the variable has to be mentioned explicitly
B	The type of the variable is determined by looking at its value
C	both a and b
D	None of the above

Question 17

Which of the following is true about Scala language ?

A	Scala is a statically typed language
B	Scala is an object oriented language
C	Scala is a functional programming language
D	All of the above

Question 18

What are three main part of akka streams?

A	Source, Flow, Sink
B	Source, Flow, BidirectionalFlow
C	ReactiveStream, Source, Flow
D	Stream, Source, Reactive

Question 19

The difference between a val and a var is that_____

A	val is a constant
B	var is a constant
C	var is a variable
D	reassigning a value to val is an error

Question 20

Is having ; ( semi-colon) at the end of the expressions in Scala an error ?

A	TRUE
B	FALSE
C	some times True
D	All of the above

Question 21

bt is an open-source build tool for Scala and Java projects. Can it execute tasks in parallel?

A	it can only execute one task at once
B	Yes
C	No
D	None of the above

Question 22

What is the output/error of the following statement ? val myA= Array(2,3,4) myA.update(1,5)

A	myA now contains 2,5,4
B	its a compilation error at line 2, of the update method's existant
C	Error as myA can not be updated as it is a val not var
D	None of the above

Question 23

Which of the following statements are true about Lists and Arrays?

A	Lists are immutable
B	Arrays are mutable
C	Once you have declared a List, you cannot add more elements later
D	All of the above

Question 24

What is the advantage of Scala?

A	Less error prone functional style
B	High maintainability and productivity
C	High scalability
D	All of the above

Question 25

When can you use traits?

A	If the behaviour will not be reused, then make it a concrete class. Anyhow it is not a reusable behaviour
B	In order to inherit from it in Java code, an abstract class can be used
C	If efficiency is a priority then lean towards using a class
D	All of the above

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