Scala MCQ Questions

Scala MCQ Questions

  • Satyam Jaiswal
  • 25th Nov, 2021

We are introducing here the best Scala MCQ Questions, which are very popular & asked various times. This Quiz contains the best 25+ Scala MCQ with Answers, which cover the important topics of Scala. for which, you can perform best in Scala Exams, Interviews, and Placement activities.

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Scala MCQ Questions

1) What are the Scala variables?

  • A. val myVal: Int=1
  • B.var myVar : Int=0;
  • C.Both A and B
  • D.None of the above

2) What is Scala?

  • A. API
  • B.UI development tool
  • C.framework
  • D.programming language

3) Scala stands for ________.

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

4) What are the few collections in Scala?

  • A. Array
  • B.Sets
  • C.List
  • D.All of the above

5) Is Scala is Case Sensitive language?

  • A. Yes
  • B.No
  • C.May be
  • D.Can't say

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

  • A. Yes
  • B.No
  • C.May be
  • D.Can't say

7) A closure is a function whose return value depends on a variable declared outside it.

  • A. True
  • B.False

8) What is Scala used for?

  • A. functional programming
  • B.strong static systems
  • C.Both A and B
  • D.None of the above

9) Which companies use Scala?

  • A. LinkedIn
  • B.Twitter
  • C.Tumblr
  • D.All of the above

10) Scala is written in ________ language.

  • A. C
  • B.Java
  • C.Python
  • D.C++

11) What is a monad in Scala?

  • A. An object that wraps another
  • B.A singleton object
  • C.A function with a single parameter
  • D.None of the above

12) The advantage of Scala are __________.

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

13) Without an explicit import, maps in Scala are by default ________.

  • A. Mutable
  • B.Immutable
  • C.Both A and B
  • D.None of the above

14) ______ is used to define a function in Scala.

  • A. function
  • B.def
  • C.func
  • D.All of the above

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

  • A. Command-line arguments
  • B.Default parameters
  • C.Implicit parameters
  • D.Named arguments

16) What is Scala’s programming paradigm?

  • A. Statically-Typed
  • B.Functional
  • C.Object-Oriented
  • D.All of the above

17) Left and Right are case classes.

  • A. Yes
  • B.No
  • C.May be
  • D.Can't say

18) Java compatibility makes Scala suitable for ________.

  • A. Apple Development
  • B.Android Development
  • C.Google Development
  • D.None of the above

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

  • A. Groups
  • B.Sets
  • C.Maps
  • D.Forums

20) Scala is designed by ______.

  • A. James Gosling
  • B.John Von Neumann
  • C.Guido van Rossum
  • D.Martin Odersky

21) _______ is a Scala compiler that compiles to JavaScript.

  • A. Scala.js
  • B.Scala.py
  • C.Scala.tkt
  • D.Scala.cpp

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

  • A. boolean contentEquals(StringBuffer sb)
  • B.String concat(String str)
  • C.byte getBytes()
  • D.All of the above

23) ________ abstraction from functional programming helps us deal with updating complex immutable nested objects.

  • A. Case classes
  • B.Lens
  • C.Extractors
  • D.None of the above

24) Which among the following is a Scala Web Frameworks?

  • A. The Play framework
  • B.The Lift Framework
  • C.The Bowler framework
  • D.All of the above

25) Scala was released in the year ______.

  • A. 2001
  • B.2002
  • C.2003
  • D.2004

26) We can execute a Scala program in ______ modes.

  • A. script mode
  • B.interactive mode
  • C.Both A and B
  • D.None of the above

27) Scala has singleton objects, which are essentially classes with only one instance.

  • A. True
  • B.False

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

  • A. It is mutable object.
  • B.It allows to create multiline strings by including the string inside three double-quotes.
  • C.It can be changed.
  • D.All of the above

29) How do you abruptly stop execution in the REPL?

  • A. Pressing Ctrl+C
  • B.Pressing Ctrl+X
  • C.Pressing Ctrl+Z
  • D.Pressing Ctrl+V

30) The null value is of type _________.

  • A. scl.Null
  • B.scala.n
  • C.scala.Null
  • D.None of the above

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