Top-notch Scala Test - 62+ MCQs: Scala test: Evaluate Your Expertise with Challenging Scala Questions and Answers

1. Which design pattern is commonly used in Scala for managing shared functionality across multiple classes?

Decorator Pattern

Singleton Pattern

Observer Pattern

Mixin Pattern

2. What is the purpose of 'implicit parameters' in Scala?

Method Overloading

Method Overriding

Type Inference

Default Parameter Values

3. Which collection type is immutable in Scala?

List

Array

Map

Set

4. How does Scala handle exceptions, and what is the primary construct for exception handling?

try-catch-finally

if-else

switch-case

goto

5. How does Scala handle concurrency, and what construct is commonly used for concurrent programming?

Threads

Futures

Callbacks

Promises

6. Explain the concept of pattern matching in Scala.

A mechanism to match values against a pattern and execute corresponding code

A technique for optimizing recursive functions

A way to create custom data types in Scala

A feature for handling exceptions in functional programming

7. Which type of exception handling is used in Scala?

try-catch-finally

if-else

switch-case

goto

8. Which collection type is mutable in Scala?

List

Array

Map

Set

9. What is the purpose of the 'getOrElse' method in Scala's Option type?

Retrieve the Value

Handle Exceptions

Return a Default Value

Transform the Value

10. In Scala, what is the purpose of the 'trait' keyword?

Class Declaration

Interface Declaration

Object Declaration

Enumeration Declaration

11. Which programming paradigm does Scala support?

Imperative

Functional

Procedural

Logical

12. How does Scala handle immutability, and why is it important in functional programming?

Scala enforces immutability through the 'mutable' keyword

Immutability is not supported in Scala

Scala encourages immutability, which helps in writing safer and more predictable code

Immutability is handled through the 'immutable' keyword

13. Which keyword is used for creating an anonymous function in Scala?

function

lambda

anonymous

14. In Scala, what does 'sealed' trait or class mean?

No Inheritance Allowed

Open for Extension

Final and Closed

Immutable

15. What is the significance of 'yield' in a for comprehension?

Terminate the Loop

Return a Value from the Loop

Skip the Iteration

Define a Variable

16. What is the purpose of the 'case' keyword in Scala?

Exception Handling

Pattern Matching

Conditional Statements

Looping Constructs

17. What is the purpose of 'unapply' method in Scala's extractor objects?

Generate Random Values

Destructure Objects

Handle Null Values

Create Instances

18. What is the purpose of the 'yield' keyword in Scala?

Terminate a Function

Indicate a Loop

Return a Value from a Loop

Define a Variable

19. Which keyword is used for defining a method in Scala?

function

method

def

procedure

20. In Scala, what is the purpose of the 'object' keyword?

Create an Instance of a Class

Declare a Variable

Define a Singleton Object

Implement an Interface

Scala MCQ Test 4