Lesson 1: Kotlin basics

1. Which file extension is used to save Kotlin files?

   .java

   .kot

   .kt or .kts

   .android

2. Which keyword is used to define an immutable variable?

   var

   val

   immulvar

   immutableVar

3. Is Kotlin interoperable with Java programming language?

   Yes, it is interoperable

   No, it is not interoperable

4. Which command will return the length of a String in Kotlin?

   str.length

   length(str)

   str.lengthOf

   str.getLength()

5. Which of the following options is used to write null-safe code in Kotlin?

   Range

   Sealed Class

   Elvis Operator

   Lambda Function

6. What is the correct way to create an Arraylist in Kotlin?

   val map = hashMapOf(1 to "one", 2 to "two", 3 to "three")

   enum class Color {RED, GREEN, BLUE}

   val set = hashSetOf(1, 2, 3)

   val list = arrayListOf(1, 2, 3)

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