Scala Constructs MCQs Solution | TCS Fresco Play

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1. Which of the following are the key concepts of Functional Programming a. Immutability b. Pure functions c. Inheritance d. Referential Transparency .

a,b,d

2. Functional programming language cannot be an object oriented language too (True/False)

False

3. Scala is a pure functional programming language (True/False)

False

4. You can modify an immutable object once created (Yes/No)

No

5. Can the following pseudo function be considered a pure function ? function getMeTimeAdded(arg Integer) = currentTime + Integer

No

6. For the given statement,

val s = List(1,2,3)

7. What would be the type of s?

.......List[Int]

8. Is this a valid expression val f: Int = (x: Int) => x + 1

No

9. What is the preferred qualifier for defining a variable in Scala.

val

10. What would be the output of following snippet

val s = List(1,2,3,4)

val t = List(5,6,7,8)

val n = s ++ t

println(n)

.......List(1, 2, 3, 4, 5, 6, 7, 8)

11. What is the default class List is imported from ?

scala.collection.immutable

12. What would be the output of following code snippet.

val l = List(1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 5, 5, 8)

println(l.take(3))

.............List(1,1,1)

13. AnyVal is best type of all primitive data types

True

14. Scala supports only single inheritance

False

15. Scalability is an important trait of a functional programming language?

False

16. Consider the following code snippet

def prnt = {print("scala"); 1}

def fun(a:Int,b: => Int) = print(a)

17. What will be the output for function call fun(prnt,5)?

............scala1

18. Is this operation valid

var s = "String 1"

...

...

s = "String 2"

................Yes

19. Which of the following programming paradigm does Scala support?

All the above

20. Scala classes can contain static members

False

21. AnyVal is best type of all primitive data types

False

22. Which of the following type allows only single instance to exist in global scope

def.....object

23. Which of the following cannot have a constructor

trait

24. Functions are first class objects in function programming

True

25. Consider the following code snippet (a: Int) => a*a. Above code snippet is an example of

anonymous function

26. Which one is the correct expression?

val f = (x: Int) => x + 1

27. Expressions in Scala evaluated using method called?

substitution

28. Scala compiler will compile the following expression successfully

val s: Int = 5.5

False

29. Which all frameworks are developed using Scala

Spark

30. Object keyword is used to define a singleton class in Scala

True

31. Given the following snippet, what would be the output

val l = List(1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 5, 5, 8)

println(l.drop(10)

................List(3, 5, 5, 8)

32. Which of the following expression has side effect

var y = 0; def Inc = y=y+1

33. Which of the following feature in Java resembles trait in Scala

abstract class

34. Scala can be run only on JVM.

False

35. Singleton is created in Scala using keyword

Object

36. In functional programming language functions can be

can only be passed as call by value.....can pass as an argument

37. Singleton object in Scala can be made executable

by extending App or with the main function

38. Scala has immutable collections

True

39. What would be the output of this code

val n = List(1,2,3,4,5)

println(n.map(_ % 2))

............List(1, 0, 1, 0, 1)

40. Mentioning function return type is optional in Scala

True

41. Mathematical functions are best implemented in?

functional programming language

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