Kotlin MCQs with answers Page - 4

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. How do you define an interface in Kotlin?

  • (A) interface MyInterface {}
  • (B) def MyInterface {}
  • (C) abstract class MyInterface {}
  • (D) protocol MyInterface {}

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Q. What does the keyword 'open' signify in Kotlin?

  • (A) Variable is open to null
  • (B) Method or class can be overridden
  • (C) Indicates a getter method
  • (D) Creates a public method

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Q. Which function is used to print a message to the console in Kotlin?

  • (A) echo()
  • (B) console.log()
  • (C) print() or println()
  • (D) printf()

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Q. What will happen if you try to assign null to a non-nullable type in Kotlin?

  • (A) It compiles and runs
  • (B) It throws a warning
  • (C) It results in a compile-time error
  • (D) It skips the assignment

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Q. How do you call a superclass constructor in Kotlin?

  • (A) super()
  • (B) parent()
  • (C) base()
  • (D) super.constructor()

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Q. Which of the following represents a Kotlin lambda expression?

  • (A) lambda(x) => x*x
  • (B) fun x -> x*x
  • (C) { x -> x * x }
  • (D) x -> x*x

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Q. Which of the following is used to perform multi-branch conditional expressions in Kotlin?

  • (A) if-else
  • (B) when
  • (C) switch
  • (D) select

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Q. What does the keyword 'in' do in a for-loop in Kotlin?

  • (A) Checks the data type
  • (B) Declares a new variable
  • (C) Indicates the range to loop through
  • (D) Includes a file

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Q. Which function in Kotlin can be used to filter a list?

  • (A) select()
  • (B) filter()
  • (C) map()
  • (D) choose()

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Q. Which Kotlin collection allows duplicates?

  • (A) Set
  • (B) Map
  • (C) List
  • (D) Dictionary

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