Kotlin Programming MCQ for Competitive Exams, Interviews, and Certifications

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Each section contains 100 MCQs on Kotlin Program .

What does the !! operator do?

A) It converts any value to a non-null type and throws anexception if the value is in fact null B) It compares two values for identity rather than equality C) It returns the left-hand operand if the operand is not null: otherwise it returns the right have operand D) It's the modulo operator in Kotlin, similar to Java's %

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Answer & Solution

Answer: Option A

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What is the syntax for calling a method in Kotlin?

A) object.method() B) object.function() C) object.procedure() D) object.call()

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Answer & Solution

Answer: Option A

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What is the correct way to define a primary constructor in Kotlin?

A) constructor() B) class constructor() C) primary constructor() D) class Person()

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Answer & Solution

Answer: Option D

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Does Kotlin have primitive data types, such as int, long, float?

A) No, not at language level. But the Kotlin compiler makes use of JVM primitives for best performance B) Yes, but Kotlin internally always converts them to their non-primitive counterparts C) No, Kotlin does not have nor use primitive data types D) Yes, Kotlin is similar to Java in this respect

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Answer & Solution

Answer: Option A

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How do we throw an exception in Kotlin?

A) throw Exception() B) raise Exception() C) Exception.throw() D) None of the above

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Answer & Solution

Answer: Option A

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What does the data class not provide?

A) An auto-generated "toString()" method B) Automatic conversion from/to JSON C) Auto-generated equals() and hashcode() method D) A generated copy(....) method for creating copies of the instances

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Answer & Solution

Answer: Option B

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What is the entry point for a Kotlin application?

A) fun static main(){} B) fun main(){} C) fun Main(){} D) public static void main(){}

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Answer & Solution

Answer: Option B

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The function to print a line in Kotlin is?

A) Printline() B) println() C) print() D) Both B & C

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Answer & Solution

Answer: Option D

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Which of the following separates function parameters

A) The character : B) The character , C) The character = D) The character -

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Answer & Solution

Answer: Option B

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Which lifecycle method is called to make an activity visible?

A) onPause() B) onVisible() C) onStart() D) onDestroy()

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Answer & Solution

Answer: Option C

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