Kotlin MCQs with answers Page - 3

Here, you will find a collection of MCQ questions on Kotlin. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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Q. Which extension is used for Kotlin source files?

  • (A) .kt
  • (B) .kotlin
  • (C) .kot
  • (D) .java

A

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Q. Which of the following is true about Kotlin arrays?

  • (A) They are fixed-size and immutable
  • (B) They are dynamic and can grow
  • (C) They are fixed-size but mutable
  • (D) They are always null-safe

A

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Q. Which keyword in Kotlin is used to inherit a class?

  • (A) inherits
  • (B) extends
  • (C) :
  • (D) by

A

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Q. What is the default visibility modifier in Kotlin?

  • (A) public
  • (B) private
  • (C) protected
  • (D) internal

A

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Q. How do you create a singleton in Kotlin?

  • (A) Using the singleton keyword
  • (B) Using object declaration
  • (C) Using static keyword
  • (D) Using companion class

A

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Q. Which collection is immutable in Kotlin?

  • (A) arrayListOf()
  • (B) mutableListOf()
  • (C) listOf()
  • (D) arrayOf()

A

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Q. How do you check if a variable is of a specific type in Kotlin?

  • (A) is
  • (B) typeof
  • (C) instanceof
  • (D) check

A

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Q. Which keyword is used for abstract classes in Kotlin?

  • (A) virtual
  • (B) abstract
  • (C) base
  • (D) interface

A

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Q. What does the !! operator do in Kotlin?

  • (A) It checks for null
  • (B) It converts nullable to non-nullable forcibly
  • (C) It is a comment operator
  • (D) It throws a warning

A

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Q. Which Kotlin feature helps avoid boilerplate code for data holding classes?

  • (A) object
  • (B) data class
  • (C) enum class
  • (D) sealed class

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