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

1. 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

2. In Kotlin, how do you create a class with a primary constructor?

class MyClass { constructor() }

class MyClass : constructor() {}

class MyClass constructor() {}

class MyClass() {}

3. What is the 'when' expression used for in Kotlin?

To define switch-case statements

To create conditional expressions

To handle exceptions

To iterate over collections

4. 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

5. How do you declare an enum class in Kotlin?

enum class MyEnum {}

class enum MyEnum {}

enum MyEnum : class {}

class MyEnum : enum {}

6. What is the 'by' keyword used for in Kotlin?

To declare a new variable

To indicate that a class can be delegated to another class

To define the inheritance hierarchy

To create a binary operation

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

class MyClass<T> {}

generic class MyClass {}

class MyClass : generic {}

T class MyClass {}

8. What is the purpose of the 'first' function in Kotlin?

To specify the first element of a collection

To apply a function to the first element of a collection

To retrieve the first element that matches a predicate

To create a new collection with the first element

9. In Kotlin, what is the purpose of the 'repeat' function?

To create repeated sequences

To define a recursive function

To repeat the execution of a loop

Kotlin does not have a 'repeat' function

10. In Kotlin, what is the purpose of the 'init' block?

To initialize global variables

To execute code before program execution begins

To handle program termination

To initialize properties of a class

11. 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

12. 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

13. How do you define a function in Kotlin?

function myFunction() {}

fun myFunction() {}

define myFunction() {}

fun: myFunction() {}

14. In Kotlin, how do you declare a variable without initializing it?

var x: Int

val x = 0

var x: Int = 0

val x: Int = 0

15. How do you declare a package in Kotlin?

package com.example.myPackage

com.example.myPackage

declare package com.example.myPackage

package: com.example.myPackage

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

function myFunction() {}

fun myFunction() {}

top fun myFunction() {}

fun: myFunction() {}

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

fun String.extendFunction() {}

String fun extendFunction() {}

extend fun String.extendFunction() {}

fun extendFunction() String {}

18. 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

19. 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

20. How do you declare an array in Kotlin?

val myArray = array()

array myArray[]

val myArray = Array()

val myArray = arrayOf()

21. 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

22. In Kotlin, what is the purpose of the 'step' parameter in a range?

To define the range size

To specify the range increment

To determine the range start

To calculate the range average

23. 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

24. In Kotlin, what is the purpose of the 'also' function?

To apply a function to each element of a collection

To handle program initialization

To define a scope for the current object

To perform additional operations on an object and return it

25. 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

26. How do you declare an extension property in Kotlin?

property String myProperty

String myProperty property

val String.myProperty

val myProperty: String

27. Which collection type is immutable in Kotlin?

List

MutableList

Array

Set

28. Which keyword is used for type casting in Kotlin?

cast

convert

29. 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

30. 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

31. In Kotlin, what is the 'getter' keyword used for?

To specify the visibility modifier

To define the getter function for a property

To declare external declarations for platform-specific code

To create a lazy property

32. What is the default visibility modifier in Kotlin?

private

protected

internal

public

33. What is the purpose of the 'with' function in Kotlin?

To create a new instance of a class

To apply a function to each element of a collection

To define a scope for multiple function calls on the same object

To handle program termination

34. What is the purpose of the 'break' statement in Kotlin?

To end the program execution

To exit the current loop or when statement

To skip the next iteration of a loop

To return a value from a function

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

fun <T> myFunction() {}

generic fun myFunction() {}

fun myFunction<T>() {}

T fun myFunction() {}

36. How do you declare an interface in Kotlin?

interface MyInterface {}

MyInterface {}

class MyInterface {}

MyInterface : class {}

37. What is the purpose of the 'by lazy' keyword in Kotlin?

To specify lazy loading for classes

To create a lazy property that is computed the first time it is accessed

To declare external declarations for platform-specific code

To define the priority of operators

38. What is the purpose of the 'reduce' function in Kotlin?

To reduce the size of a collection

To combine elements of a collection into a single result

To apply a function to each element of a collection

To remove null values from a collection

39. How do you declare a nullable variable in Kotlin?

var x: Int = null

var x: Int? = null

val x: Int? = 0

val x: Int = null

40. 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

Kotlin MCQ Test 2