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Kotlin Programming MCQ for Competitive Exams, Interviews, and Certifications

Ace your competitive exams, technical interviews, and certifications with these Kotlin programming MCQ questions. Perfect for Android developers and software engineers to test their Kotlin skills and knowledge. Page-7 section-3

Each section contains 100 MCQs on Kotlin Program .
61
What is the type of arr in the following code?
val arr = arrayof(1, 2, 3)
Discuss
Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
62
From the Supervisor subclass, how do you call the Employee class's display() method?
open class Employee(){
  open fun display() = println("Employee display()")
}
class Supervisor : Employee() {
  override fun display() {
    println("Supervisor display()")
  }
}
Discuss
Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
63
The code below shows a typical way to show both index and value in many languages, including Kotlin. Which line of code shows a way to get both index and value more idiomatically?
var ndx = 0;
for (value in 1..5){
  println("$ndx - $value")
  ndx++
}
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Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
64
This code does not print any output to the console. What is wrong?
firstName?.let {
  println("Greeting $firstname!")
}
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Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
65
What is the equivalent of the following Java expression in Kotlin?
int x = a ? b : c
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Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
66
You have an enum class Signal that represents the state of a network connection. You want to print the position number of the SENDING enum. Which line of code does that?
enum class Signal { OPEN, CLOSED, SENDING }
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Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
67
What is the output of the following code?
val list : List<Int> = listof(1, 2, 3)
list.add(4)
print(list)
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Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
68
What does the following code print?
val listA = mutableListOf(1, 2, 3)
val listB = listA.add(4)
print(listB)
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Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
69
What is the difference between the declarations of COLOR and SIZE?
class Record{
  companion object {
    const val COLOR = "Red"
    val SIZE = "Large"
  }
}
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Answer & Solution
Answer: Option D
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70
In the file main.kt, you ae filtering a list of integers and want to use an already existing function, removeBadValues. What is the proper way to invoke the function from filter in the line below?
val list2 = (80..100).toList().filter(_____)
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Answer & Solution
Answer: Option A
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