Kotlin Basic Quiz

Welcome to your Kotlin Basic Questions

Name

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

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

List

Set

Array

None

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

fun

func

proc

method

None

Which Kotlin feature helps prevent null pointer exceptions?

Unicorn operator (->>)

Arrow operator (->)

Star operator (*)

Elvis operator (?:)

None

How do you declare a nullable variable in Kotlin?

Using the ? operator

Using the # symbol

Using the * symbol

Using the ! operator

None

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

foreach loop

while loop

repeat loop

for-in loop

None

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,

This program will not compile.

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

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

None

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

Using the "get" keyword

Using the "var" keyword

Using the "readonly" keyword

Using the "val" keyword

None

10.

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

11.

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")
}

After swapping: a = 0, b = 0

After swapping: a = 5, b = 10

After swapping: a = 10, b = 5

This program will not compile.

None

12.

What is the entry point of a Kotlin program?

execute() function

start() function

run() method

main() function

None

13.

What does the following Kotlin program do?

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

Calculates the factorial of 10.

Prints the first 10 prime numbers.

Calculates the sum of the first 10 numbers.

Prints the numbers from 10 to 1 in reverse order.

None

14.

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

const

let

var

val

None

15.

What is the output of the following Kotlin program?

fun main() { 
 var sum = 0
 for (i in 1..10) {
 sum += i
 } 
 println(sum) 
}

None

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