Kotlin Basic Quiz

Welcome to your Kotlin Basic Questions

Name

How do you declare a nullable variable in Kotlin?

Using the # symbol

Using the * symbol

Using the ! operator

Using the ? operator

None

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

while loop

for-in loop

repeat loop

foreach loop

None

Which Kotlin feature helps prevent null pointer exceptions?

Arrow operator (->)

Star operator (*)

Unicorn operator (->>)

Elvis operator (?:)

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

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 = 10, b = 5

This program will not compile.

After swapping: a = 5, b = 10

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
 }
}

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,

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

None

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

It specifies a variable's data type

It defines a new data type

It declares a function

It stands for "funny"

None

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

Using the "readonly" keyword

Using the "var" keyword

Using the "val" keyword

Using the "get" keyword

None

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

val x = 5
val y = 3
val result = x * y

None

10.

What is the entry point of a Kotlin program?

run() method

main() function

execute() function

start() function

None

11.

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

Set

Array

Map

List

None

12.

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

None

13.

What is the output of the following Kotlin program?

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

None

14.

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 numbers from 10 to 1 in reverse order.

Prints the first 10 prime numbers.

Calculates the factorial of 10.

Calculates the sum of the first 10 numbers.

None

15.

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

let

val

const

var

None

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