Kotlin Basic Quiz

Welcome to your Kotlin Basic Questions

Name

What is the Kotlin equivalent of a "for loop" in other programming languages?

foreach loop

for-in loop

while loop

repeat loop

None

Given the following Kotlin program, what will be the value of max?

val num1 = 10
val num2 = 25
val num3 = 15
val max = if (num1 >= num2 && num1 >= num3) num1
else if (num2 >= num1 && num2 >= num3) num2
else num3

None

In Kotlin, which keyword is used to declare a variable that cannot be reassigned?

val

const

var

let

None

What is the output of the following Kotlin program?

fun main() {
 val numbers = arrayOf(1, 2, 3, 4, 5)
 val sum = numbers.reduce { acc, num -> acc + num }
 println(sum)
}

120

None

In Kotlin, which collection type represents an ordered list of elements?

Map

Set

Array

List

None

What is the output of the following Kotlin program?

fun main() {
 var a = 5
 var b = 10
 a = b.also { b = a }
 println("After swapping: a = $a, b = $b")
}

This program will not compile.

After swapping: a = 10, b = 5

After swapping: a = 5, b = 10

After swapping: a = 0, b = 0

None

Which Kotlin feature helps prevent null pointer exceptions?

Unicorn operator (->>)

Arrow operator (->)

Star operator (*)

Elvis operator (?:)

None

What is the entry point of a Kotlin program?

run() method

start() function

execute() function

main() function

None

In Kotlin, what keyword is used to declare a function?

method

fun

func

proc

None

10.

How can you define a read-only property in Kotlin?

Using the "readonly" keyword

Using the "var" keyword

Using the "get" keyword

Using the "val" keyword

None

11.

In Kotlin, what is the purpose of the "fun" keyword?

It declares a function

It defines a new data type

It specifies a variable's data type

It stands for "funny"

None

12.

What does the following Kotlin program do?

fun main() {
 var n = 10
 var factorial = 1
 while (n > 0) {
 factorial *= n
 n--
 }
 println(factorial)
}

Prints the first 10 prime numbers.

Prints the numbers from 10 to 1 in reverse order.

Calculates the sum of the first 10 numbers.

Calculates the factorial of 10.

None

13.

What is the range operator used to create a range of numbers in Kotlin?

None

14.

What is the output of the following Kotlin program?

fun main() {
 var fib1 = 0
 var fib2 = 1
 for (i in 1..10) {
 print("$fib1, ")
 val next = fib1 + fib2
 fib1 = fib2
 fib2 = next
 }
}

1, 1, 2, 3, 5, 8, 13, 21, 34, 55,

0, 1, 2, 3, 4, 5, 6, 7, 8, 9,

This program will not compile.

0, 1, 1, 2, 3, 5, 8, 13, 21, 34,

None

15.

How do you declare a nullable variable in Kotlin?

Using the # symbol

Using the * symbol

Using the ? operator

Using the ! operator

None

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