Innovative Kotlin Test - 78+ MCQs: Kotlin test: Evaluate Your Programming Skills with Kotlin Questions and Answers

1. How do you define an extension function in Kotlin?

fun String.extendFunction() {}

String fun extendFunction() {}

extend fun String.extendFunction() {}

fun extendFunction() String {}

2. How do you declare a generic function in Kotlin?

fun <T> myFunction() {}

generic fun myFunction() {}

fun myFunction<T>() {}

T fun myFunction() {}

3. What is the syntax for a single-line comment in Kotlin?

// This is a comment

# This is a comment

/** This is a comment */

-- This is a comment

4. What is the purpose of the 'noinline' modifier in Kotlin?

To prevent inlining of a function

To mark a function as non-nullable

To enforce immutability for a variable

To specify the return type of a function

5. In Kotlin, what is the purpose of the 'by lazy' delegate?

To create a lazy-loaded variable

To delegate property initialization to another class

To implement lazy loading for functions

To define a variable with delayed initialization

6. What is the purpose of the 'trim' function in Kotlin?

To trim leading and trailing whitespace

To resize a collection

To remove null values from a collection

To handle program termination

7. How do you declare an array in Kotlin?

val myArray = array()

array myArray[]

val myArray = Array()

val myArray = arrayOf()

8. What is the purpose of the 'expect' keyword in Kotlin?

To define expected behavior for a function

To specify the return type of a function

To declare external declarations for platform-specific code

To create conditional expressions

9. What is the purpose of the 'sealed class' in Kotlin?

To restrict the inheritance of a class hierarchy

To declare a class with restricted access modifiers

To define a class with a limited number of instances

To create a class with private constructors

10. What is the purpose of the 'invoke' function in Kotlin?

To create a new instance of a class

To call instances of a function type

To handle program termination

To invoke a secondary constructor

11. In Kotlin, what is the purpose of the 'sequence' function?

To define a sequence of elements

To create an iterable collection

To handle program initialization

To apply a function to each element of a collection

12. How do you declare a top-level function in Kotlin?

function myFunction() {}

fun myFunction() {}

top fun myFunction() {}

fun: myFunction() {}

13. How do you define a class with a private constructor in Kotlin?

class MyClass { private constructor() }

class MyClass(private constructor()) {}

class MyClass private constructor() {}

class MyClass(private constructor) {}

14. In Kotlin, what is the 'invoke' operator used for?

To create an instance of a class

To define the behavior of calling an instance as a function

To specify the return type of a function

To declare external declarations for platform-specific code

15. What is the purpose of the 'reified' keyword in Kotlin?

To enforce immutability for a variable

To specify a type parameter at runtime

To create a recursive function

To mark a class as reusable

16. In Kotlin, what is the purpose of the 'reified' keyword?

To declare a variable as reified

To create a recursive function

To specify a function as reified

Kotlin does not have a 'reified' keyword

17. In Kotlin, what is the purpose of the 'let' extension function?

To create an extension function for nullable types

To handle program initialization

To apply a function to the result of a nullable expression

To define a lambda expression

18. What is the purpose of the 'when' statement in Kotlin?

To create switch-case statements

To define loops

To handle exceptions

To create conditional expressions

19. What is the purpose of the 'let' function in Kotlin?

To define a lambda expression

To create an extension function

To apply a function to the result of a nullable expression

To handle program initialization

20. What is the purpose of the 'use' function in Kotlin?

To utilize external libraries

To handle program initialization

To manage resource cleanup for AutoCloseable resources

To define a scope for exception handling

21. How do you declare a generic class in Kotlin?

class MyClass<T> {}

generic class MyClass {}

class MyClass : generic {}

T class MyClass {}

22. What is the purpose of the 'filter' function in Kotlin?

To apply a function to each element of a collection

To filter elements based on a predicate

To create a new collection with transformed elements

To remove null values from a collection

23. Which collection type is immutable in Kotlin?

List

MutableList

Array

Set

24. What is the purpose of the 'flatMap' function in Kotlin?

To apply a function to each element of a collection

To flatten a collection of collections

To create a new collection with transformed elements

To handle program initialization

25. What is the purpose of the 'crossinline' modifier in Kotlin?

To declare external declarations for platform-specific code

To create a cross-platform function

To mark a function as non-nullable

To prevent non-local returns in an inline function

26. In Kotlin, what is the purpose of the 'noinline' modifier for functions?

To indicate that a function should not be inlined

To define a function as non-recursive

To disable tail-call optimization

Kotlin does not have a 'noinline' modifier

27. What is the purpose of the 'tailrec' modifier in Kotlin?

To define a recursive function

To mark the last element of a collection

To specify the tail of a class

To optimize tail-recursive functions

28. How does Kotlin handle default arguments in functions?

By using the 'default' keyword

By declaring functions with an empty body

By specifying default values for parameters

Kotlin does not support default arguments

29. What is the purpose of 'lateinit' in Kotlin?

To specify a variable as constant

To indicate that a variable will be initialized later

To declare a variable with nullable type

To enforce immutability for a variable

30. What is the purpose of the 'inline' modifier in Kotlin?

To prevent inlining of a function

To mark a function as non-nullable

To create an inline function

To enforce immutability for a variable

Kotlin MCQ Test 3