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

1. How do you declare a constant property in a class in Kotlin?

const val myProperty = 10

val constant myProperty = 10

property val myProperty = 10

val myProperty: Constant = 10

2. Which keyword is used to define a constant in Kotlin?

const

val

var

final

3. 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

4. In Kotlin, what is the purpose of the 'yield' function?

To yield control to another coroutine

To yield a value from a generator function

To yield the execution of a loop

Kotlin does not have a 'yield' function

5. How do you declare a function with an infix notation in Kotlin?

fun add(a: Int, b: Int) = a infixPlus b

fun add(a: Int, b: Int) = a + infix b

infix fun add(a: Int, b: Int) = a + b

fun infix add(a: Int, b: Int) = a + b

6. What is the purpose of the 'coroutine' keyword in Kotlin?

To create a coroutine function

To specify the return type of a coroutine

Kotlin does not have a 'coroutine' keyword

To handle program termination

7. What is the default visibility modifier in Kotlin?

private

protected

internal

public

8. 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

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

fun String.extendFunction() {}

String fun extendFunction() {}

extend fun String.extendFunction() {}

fun extendFunction() String {}

10. 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

11. 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

12. 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

13. What is the syntax for a multiline string in Kotlin?

`This is a multiline string`

'This is a multiline string'

"This is a multiline string"

'''This is a multiline string'''

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. What is the purpose of the 'forEach' function in Kotlin?

To iterate over a range of values

To perform a case-insensitive comparison

To iterate over elements of a collection

To apply a function to each element of a collection

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

class MyClass<T> {}

generic class MyClass {}

class MyClass : generic {}

T class MyClass {}

17. 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

18. How do you declare a package in Kotlin?

package com.example.myPackage

com.example.myPackage

declare package com.example.myPackage

package: com.example.myPackage

19. How do you define a function in Kotlin?

function myFunction() {}

fun myFunction() {}

define myFunction() {}

fun: myFunction() {}

20. 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

21. 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

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

fun <T> myFunction() {}

generic fun myFunction() {}

fun myFunction<T>() {}

T fun myFunction() {}

23. 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

24. 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) {}

25. Which collection type is immutable in Kotlin?

List

MutableList

Array

Set

26. 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

27. In Kotlin, how do you handle exceptions?

Using try-catch blocks

Using the 'throws' keyword

Exceptions are not supported in Kotlin

By using external exception handling libraries

28. 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

29. 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

30. 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

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

class MyClass { constructor() }

class MyClass : constructor() {}

class MyClass constructor() {}

class MyClass() {}

32. What is the purpose of the 'groupBy' function in Kotlin?

To create a new group of elements

To group elements based on a key selector

To handle program initialization

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

33. What is the purpose of the 'operator' keyword in Kotlin?

To define mathematical operations for a class

To declare the priority of operators

To mark a class as an operator

To create conditional expressions

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

cast

convert

35. 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

36. 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

37. What is the purpose of the 'apply' function in Kotlin?

To apply mathematical operations

To apply functions to each element of a collection

To configure the properties of an object during its creation

To handle program initialization

38. 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

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

function myFunction() {}

fun myFunction() {}

top fun myFunction() {}

fun: myFunction() {}

40. 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

Kotlin MCQ Test 2