Programming with Scala MCQs Solution | TCS Fresco Play
Programming with Scala 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)
What would be the type of s?
.......List[Int]
7. Is this a valid expression val f: Int = (x: Int) => x + 1
No
8. What is the preferred qualifier for defining a variable in Scala.
val
9. 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)
10. What is the default class List is imported from ?
scala.collection.immutable
11. 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)
12. AnyVal is best type of all primitive data types
True
13. Scala supports only single inheritance
False
14. Scalability is an important trait of a functional programming language?
False
15. Consider the following code snippet
def prnt = {print("scala"); 1}
def fun(a:Int,b: => Int) = print(a)
16. What will be the output for function call fun(prnt,5)?
............scala1
17. Is this operation valid
var s = "String 1"
...
...
s = "String 2"
................Yes
18. Which of the following programming paradigm does Scala support?
All the above
19. Scala classes can contain static members
False
20. AnyVal is best type of all primitive data types
False
21. Which of the following type allows only single instance to exist in global scope
def.....object
22. Which of the following cannot have a constructor
trait
23. Functions are first class objects in function programming
True
24. Consider the following code snippet (a: Int) => a*a. Above code snippet is an example of anonymous function. Which one is the correct expression?
val f = (x: Int) => x + 1
25. Expressions in Scala evaluated using method called?
substitution
26. Scala compiler will compile the following expression successfully
val s: Int = 5.5
False
27. Which all frameworks are developed using Scala
Spark
28. Object keyword is used to define a singleton class in Scala
True
29. 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)
30. Which of the following expression has side effect
var y = 0; def Inc = y=y+1
31. Which of the following feature in Java resembles trait in Scala
abstract class
32. Scala can be run only on JVM.
False
33. Singleton is created in Scala using keyword
Object
34. In functional programming language functions can be
can only be passed as call by value.....can pass as an argument
Singleton object in Scala can be made executable
by extending App or with the main function
Scala has immutable collections
True
35. 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)
36. Mentioning function return type is optional in Scala
True
37. Mathematical functions are best implemented in?
functional programming language
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