Scala MCQ: Scala Multiple Choice Questions and Answers

Scala MCQ with answers and explanations for placement tests and job interviews. These solved Scala MCQs are useful for the campus placement for all freshers including Engineering Students, MCA students, Computer and IT Engineers, etc.

Our Scala MCQ (Scala Multiple Choice Questions ) focuses on various parts of the Scala programming language and its concept. It will be useful for anyone learning Scala Basics, Essentials, and/or Fundamentals. We will regularly update the quiz and most interesting thing is that questions come in a random sequence. So every time you will feel new questions.

You may have come across several Scala courses during your search for learning the Scala language. Our team of experts has carefully analyzed some Scala courses for you. You can check the courses, Trial of some courses is free.

 

Guideline of Scala MCQ:

This Scala MCQ is intended for checking your Scala programming knowledge. It takes 40 minutes to pass the Scala MCQ. If you don’t finish the Scala MCQ within the mentioned time, all the unanswered questions will count as wrong. You can miss the questions by clicking the “Next” button and return to the previous questions by the “Previous” button. Every unanswered question will count as wrong. MCQ on Scala has features of randomization which feel you a new question set at every attempt.

In this Scala MCQ, we have also implemented a feature that not allowed the user to see the next question or finish the Scala quiz without attempting the current Scala MCQ.

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Scala MCQ

Scala MCQ: Scala Multiple Choice Questions and Answers

1 / 35

What are defined inside a class definition?

2 / 35

What type of object does this code create?

val x = (1234, "Active")

 

3 / 35

You have created an array using val. Can you change the value of any element of the array—and why or why not?

4 / 35

When you convert a map to a list using the toList method of the map, the result will be of which type?

5 / 35

Which statement about if-else-if-else statements is true?

6 / 35

What term is used to specify a precondition?

7 / 35

Which is not a member of the collections hierarchy?

8 / 35

Which term makes the contents of packages available without prefixing?

9 / 35

What defines methods and fields that can then be reused by mixing into classes?

10 / 35

What value does this code return?

val m1 = Map("a"->1,"b"->2,"c"->3)
m1("a")

 

11 / 35

What do you call objects with immutable state?

12 / 35

What do you call the process of changing the definition of an inherited method?

13 / 35

You want to create an iteration loop that tests the condition at the end of the loop body. Which iteration would you use?

14 / 35

Scala bytecode can run on top of Java VM. What is the fundamental difference between Java object.clone() and Scala object.copy()?

15 / 35

You have written a Scala script. How would you access command-line arguments in the script?

16 / 35

What is an advantage of an immutable object?

17 / 35

What do you use in ScalaTest to see a detailed diagram of error messages when a test fails?

18 / 35

What is one way to implement pattern matching on methods?

19 / 35

Which is a subclass of all classes?

20 / 35

When using pattern matching, which character matches on any object?

21 / 35

If you wanted to find the remainder after division, what operator would you use?

22 / 35

What type of number is 1234.e5?

23 / 35

For the for-yield construct, is the scope separate between for-body and yield-body?

24 / 35

One way to improve code reliability is to use _, which will evaluate a condition and return an error if the conditions is violated.

25 / 35

To denote a parameter that may be repeated, what should you place after type?

26 / 35

What is the data type of y after this code is executed?

val y = (math floor 3.1415 * 2)

 

27 / 35

What is the code below equivalent to?

myClass.foreach(println _)

 

28 / 35

What is the output of this function?

def main () {
     var a = 0
     for (a<-1 until 5){println(a)}

 

29 / 35

After defining a function in the interpreter, Scala returns the following. What does the

myfnc: ()Unit

 

30 / 35

What is the value of z after executing this code?

val y = List('a','b')
val z = y::List('c')

 

31 / 35

What is one way to avoid low-level parallelization details?

32 / 35

Which statement returns a success or a failure indicator when you execute this code?

val MyFuture = Future {runBackgroundFunction() }

 

33 / 35

What does this code return? val x = 3; if (x >2) x = 4 else x = x*2

34 / 35

What is called when a superclass has more than one subclass in Scala?

35 / 35

What data type would you use to store an immutable collection of objects that contain a fixed number of varying types?

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