Scala 101 Cognitive Class Exam Answers:-

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 Course Name:- Scala 101

Scala 101 Cognitive Class  Final Exam Answers:-

Question 1. A higher-order function allows us to:

• Be more declarative and not write “how” to perform work
• Pass a function to a data container
• Compose multiple transformations within a context
• Remain immutable
• All of the above

Question 2. How does Scala determine types when they are not specified?

• Implicit typing
• Type compliance
• Type inference
• Dynamic typing
• Type coercion

Question 3. What are valid members in objects?

• Class factories
• None of the above
• All of the above
• Utility methods
• Constant definitions

Question 4. What do default values and named parameters help you avoid in your code?

• Method overriding
• Singleton instances
• Method overloading
• Type declarations
• None of the above

Question 5. What does the Scala REPL stand for?

• Read, Evaluate and Print Loop
• React, Evaluate and Print Loop
• React, Emulate and Print Loop
• Read, Emulate and Print Loop
• Read, Emulate and Process Loop

Question 6. What is not true about class parameters?

• They are automatically immutable
• You must specify their type
• They live for the life of the class
• They are visible to outsiders
• None are true

Question 7. What is the maximum number of elements in a tuple?

• 22
• 11
• 2
• 32
• 12

Question 8.  What keyword does not exist in Scala?

• new
• val
• implicit
• for
• static

Question 9. Which accessibility rule is not true?

• private is visible within a package
• private does not allow outsiders to see a field
• public does allow outsiders to see a field
• public is not visible outside of a package
• All are true

Question 10. Which are valid collection types in the Scala standard library?

• Vector
• ByteSet
• HashSeq
• LinkedSet
• All are valid

Question 11. Which collection type has effectively constant time performance characteristics for all operations?

• Vector
• Stream
• HashMap
• List
• Array

Question 12. Which combination is thread-safe?

• val and mutable data
• var and mutable data
• var and immutable data
• val and immutable data
• None are thread-safe

Question 13. Which feature is not synthetically generated for case classes?

• Companion object
• clone method
• equals method
• apply and unapply
• All are generated

Question 14. Which is not a valid data container type in Scala?

• Try
• Future
• Companion object
• Option
• None of the above

Question 15. Which is the top-most collection type in the Scala collections hierarchy?

• Interpretable
• Transformable
• Iterable
• Traversable
• Observable

Question 16. Which keyword constructs a new instance of a class?

• make
• new
• instance
• create
• None of the above

Question 17. Which language cannot be compiled to run on the JVM?

• JRuby
• C
• Clojure
• Scala
• Java

Question 18. Which language features are true about Scala?

• Statically typed
• Multi-Platform
• Object-Oriented
• Functional
• All of the above

Question 19. Which statement is not true about infix notation?

• You can omit parentheses
• You can use it when you pass multiple parameters
• You can use it with symbolic method names (+, -, etc)
• All are true
• None are true

Quesstion 20. Which statement is true about field and method evaluation?

• Fields are evaluated at the call site, methods are evaluated at construction
• Fields are evaluated at construction, methods are evaluated at the call site
• Fields and methods are evaluated at construction
• Fields and methods are evaluated at the call site
• None of the above