Kotlin Kotlin Basics and Syntax

Question 1

Which keyword is used to declare an immutable variable in Kotlin?

Accepted Answer

val

Answer

var

Answer

let

Answer

const

Question 2

What is the correct way to define a nullable String in Kotlin?

Accepted Answer

String?

Answer

String

Answer

String!

Answer

Nullable<String>

Question 3

Which of the following is NOT a valid Kotlin data type?

Accepted Answer

Integer

Answer

Int

Answer

Double

Answer

Float

Question 4

What does the `?.` operator in Kotlin do?

Accepted Answer

Performs a safe call on a nullable object

Answer

Forces a non-null assertion

Answer

Casts a type forcefully

Answer

Checks equality of two nullable values

Question 5

Which keyword is used to define a constant at the top level in Kotlin?

Accepted Answer

const val

Answer

val

Answer

static val

Answer

final val

Question 6

What will `println(10 / 3)` output in Kotlin?

Accepted Answer

3

Answer

3.33

Answer

3.0

Answer

Error