Olete.in – MCQs, Mock Tests & Government Job Prep | Scala framework Scala Multiple Choice Questions

Which of the following technology is good for Stream technology?

1. Apache Spark
2. Apache Hadoop
3. Apache Flinkcorrect
4. None of the above

✅ Correct Answer: 3

What are the types of scala identifiers?

1. Alphanumeric identifiers
2. Operator identifiers
3. Mixed identifiers
4. All of these

✅ Correct Answer: 4

Scala is short form of

1. Scalable language
2. Sequential language
3. Script language
4. Scalar language

✅ Correct Answer: 1

This optimizer is based on functional programming construct in A. Java B. Scala C. D. R

1. Java
2. Scala
3. Python
4. R

✅ Correct Answer: 2

What is the three main part of Akka streams?

1. Source, Flow, Sink
2. Source, Flow, BidirectionalFlow
3. ReactiveStream, Source, Flow
4. Stream, Source, Reactive

✅ Correct Answer: 3

What is the advantage of Scala?

1. High testability
2. Provides features of concurrent programming
3. High scalability
4. All of these

✅ Correct Answer: 4

What are the different types of Scala literals?

1. Character Literalswrong
2. String Literals
3. Multi-Line strings
4. All of the above mentioned

✅ Correct Answer: 4

How do we implement loops functionally?

1. Loop Constructs
2. Mutability
3. Side Effects
4. All of the these

✅ Correct Answer: 4

What are the utility methods used in Scala?

1. String utility methods
2. Implicit conversion methods
3. Assertion utility methods
4. All of the above

✅ Correct Answer: 4

10. Now a days Scala's Java compatibility makes well suited for

1. Microsoft developmentwrong
2. Google development
3. Android developmentcorrect
4. Apple development

✅ Correct Answer: 3

In Scala, apply() serves the purpose of closing the gap between Object-Oriented and Functional paradigms

1. True
2. False
3. both (a) and (b)
4. Error

✅ Correct Answer: 1

The ___ method is utilized to select an element in the list by its index.

1. apply()
2. unapply()
3. Both A and B
4. All of the above

✅ Correct Answer: 1

Without an explicit import, maps in Scala are by default:

1. Immutable
2. Mutable
3. None
4. None of the above

✅ Correct Answer: 1

What is Scala’s programming paradigm?

1. Statically-Typed
2. Functional
3. Object-Oriented
4. All of these

✅ Correct Answer: 4

Which of the following not shows how to declare variables of the basic numeric types?

1. val b: Byte = 1 B.
2. val s: Short = 1
3. val f: Float = 3.0
4. None of the above

✅ Correct Answer: 4

A list is a collection which contains ___ data.

1. immutable
2. mutable
3. both (a) and (b)
4. None of the above

✅ Correct Answer: 1

Which one of the following is a feature of Scala strings?

1. It can be changed.
2. It is a mutable object.
3. It allows creating multiline strings by including the string inside three double quotes.
4. All of the above

✅ Correct Answer: 3

How can you format a string?

1. Val formatted= “%s %i”.format (mystring.myInt)
2. Val formatted= “%s %i”.formatted (mystring.myInt)
3. Val formatted= “%s %i”.formatstring(mystring.myInt)
4. Val formatted= “%s %i”.formatstrings(mystring.myInt)

✅ Correct Answer: 1

Scala is designed by _______.

1. Guido van Rossum
2. John Von Neumann
3. Martin Odersky
4. None of the above

✅ Correct Answer: 3

Scala runs on the _____ platform.

1. C
2. C++
3. JavaScript
4. Java

✅ Correct Answer: 4

____ is a Scala compiler that compiles to JavaScript.

1. Scala.py
2. Scala.js
3. Scala.tkt
4. None of the above

✅ Correct Answer: 2

Scala was released in the year ______.

1. 2002
2. 2004
3. 2003
4. 2005

✅ Correct Answer: 3

Which among the following is a Scala Web Frameworks?

1. The Lift Framework
2. The Bowler framework
3. The Play framework
4. All of the above

✅ Correct Answer: 4

We can execute a Scala program in ______ modes.

1. interactive mode
2. script mode
3. both (a) and (b)
4. None of the above

✅ Correct Answer: 3

What are the Scala variables?

1. val myVal: Int=1
2. var myVar : Int=0;
3. both (a) and (b)
4. None of the above

✅ Correct Answer: 3

What is Scala?

1. API
2. UI development tool
3. framework
4. programming language

✅ Correct Answer: 4

Scala stands for ________.

1. Scalable language
2. Script language
3. Scalar language
4. Sequential language

✅ Correct Answer: 1

What are the few collections in Scala?

1. Array
2. Sets
3. List
4. All of the above

✅ Correct Answer: 4

Is Scala is Case Sensitive language?

1. Yes
2. No
3. Maybe
4. Can't say

✅ Correct Answer: 1

Omitting a semicolon(;) at the end of a statement causes the compiler to throw an error.

1. Yes
2. No
3. May be
4. Can't say

✅ Correct Answer: 2

What is Scala used for?

1. functional programming
2. strong static systems
3. both (a) and (b)
4. None of these

✅ Correct Answer: 3

Which companies use Scala?

1. LinkedIn
2. Twitter
3. Tumblr
4. All of the above

✅ Correct Answer: 4

Scala is written in ________ language

1. C
2. Java
3. Python
4. C++

✅ Correct Answer: 2

What is a monad in Scala?

1. An object that wraps another
2. A singleton object
3. A function with a single parameter
4. None of the above

✅ Correct Answer: 1

The advantage of Scala are __________.

1. High scalability
2. High maintainability and productivity
3. Less error-prone functional style
4. All of the above

✅ Correct Answer: 4

Without an explicit import, maps in Scala are by default _______

1. Mutable
2. Immutable
3. both (a) and (b)
4. None of the above

✅ Correct Answer: 2

_____ is used to define a function in Scala

1. function
2. def
3. func
4. All of the above

✅ Correct Answer: 2

It is not required to pass these __________ parameters to a method while calling it. D.

1. Command-line arguments
2. Default parameters
3. Implicit parameters
4. Named arguments

✅ Correct Answer: 3

Left and Right are case classes.

1. Yes
2. No
3. May be
4. Can't say

✅ Correct Answer: 1

Java compatibility makes Scala suitable for _______

1. Apple Development
2. Android Development
3. Google Development
4. None of the above

✅ Correct Answer: 2

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

1. Groups
2. Sets
3. Maps
4. Forums

✅ Correct Answer: 2

_______ is a Scala compiler that compiles to JavaScript.

1. Scala.js B.
2. Scala.py
3. Scala.tktcorrect
4. Scala.cppwrong

✅ Correct Answer: 3

Which one of the following is not a method defined by java.lang.String class?

1. boolean contentEquals(StringBuffer sb)
2. String concat(String str)
3. byte getBytes()
4. All of the above

✅ Correct Answer: 4

____ abstraction from functional programming helps us deal with updating complex immutable nested objects.

1. Case classes
2. Lens
3. Extractors
4. None of the above

✅ Correct Answer: 2

Which among the following is a Scala Web Frameworks?

1. The Play framework
2. The Lift Framework
3. The Bowler framework
4. All of the above

✅ Correct Answer: 4

How do you abruptly stop execution in the REPL?

1. Pressing Ctrl+C
2. Pressing Ctrl+X
3. Pressing Ctrl+Z
4. Pressing Ctrl+V

✅ Correct Answer: 1

The null value is of type _______

1. scl.Null
2. scala.n
3. scala.Null
4. None of the above

✅ Correct Answer: 3

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

1. Sink.sum_
2. Sink.fold[Int, Int](0)(_ + _)
3. Sink.sum[Int](_
4. Sink.map(_ + _)

✅ Correct Answer: 2

What is the advantage of Scala?

1. Less error prone functional style
2. High maintainability and productivity
3. High scalability
4. All of the above

✅ Correct Answer: 4

When can you use traits?

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

✅ Correct Answer: 4

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

1. Scala
2. Ada
3. Pascal
4. Machine language

✅ Correct Answer: 1

Scala is a short form of

1. Scalable language
2. Sequential language
3. Script language
4. Scalar language

✅ Correct Answer: 1

One of the following is an erroneous function definition, can you spot it

1. def functionName(x:Int,y:Int):Int=x+ywrong
2. def functionName(x:Int,y:Int):Int={return x+y}
3. Sets
4. All of these

✅ Correct Answer: 4

One of the following is an erroneous function definition, can you spot it

1. def functionName(x:Int,y:Int):Int=x+ywrong
2. def functionName(x:Int,y:Int):Int={return x+y}
3. def functionName(x:Int,y:Int):Int{x+y} ()
4. def functionName(x:Int,y:Int)={x+y

✅ Correct Answer: 4

What are three main part of akka streams?

1. Source, Flow, Sink
2. Source, Flow, BidirectionalFlow
3. ReactiveStream, Source, Flow
4. Stream, Source, Reactive

✅ Correct Answer: 4

What is Scala?

1. Programming language
2. Framework
3. Platform
4. None of the above

✅ Correct Answer: 1

What are the Scala variables?

1. var myVar : Int=0;
2. val myVal: Int=1;
3. both (a) and (b)
4. None of the above

✅ Correct Answer: 3

Which one of the following Programming languages uses both object-oriented programming and functional programming paradigms?

1. Scala
2. Machine language
3. Pascal
4. Ada

✅ Correct Answer: 1

Scala stands for “____.”

1. Scalable language
2. Sequential language
3. Script language
4. Scalar language

✅ Correct Answer: 1

What are the few collections in Scala?

1. Array
2. List
3. Sets
4. All of the above

✅ Correct Answer: 4

Which of the following are the IDEs(Integrated Development Environments) for Scala?

1. IntelliJ IDEA
2. VS Code
3. GNU Emacs
4. All of the above

✅ Correct Answer: 4

The ___ is a representation of a map of all published Scala libraries.

1. Scala Library Index
2. Scaladex
3. Scala Document
4. Both A and B

✅ Correct Answer: 4