Kotlin Programming MCQ for Competitive Exams, Interviews, and Certifications

51

Which line of code shows how to call a Fibonacci function, bypass the first three elements, grab the next six, and sort the elements in descending order?

A) Val sorted = fibonacci().skip(3).take(6).sortedDescending().toList() B) Val sorted = fibonacci().skip(3).take(6).sortedByDescending().toList() C) Val sorted = fibonacci().skip(3).limit(6).sortedByDescending().toList() D) Val sorted = fibonacci().drop(3).take(6).sortedDescending().toList()

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Answer & Solution

Answer: Option D

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52

How many different kinds of constructors are available for kotlin classes?

A) Two B) None C) Four D) One

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Answer & Solution

Answer: Option B

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53

If a class has one or more secondary constructors, what must each of them do?

A) Each secondary constructor must call super() B) Each secondary constructor must call base() C) Each secondary constructor must directly or indirectly delegate to the primary D) Each secondary constructor must have the same name as the class

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Answer & Solution

Answer: Option C

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54

When can you omit the constructor keyword from the primary constructor?

A) It can be omitted only if an init block is defined B) It can be omitted anytime; it is not mandatory C) It can be omitted if secondary constructors are defined D) It can be omitted when the primary constructor does not have any modifiers or annotations

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Answer & Solution

Answer: Option D

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55

Which of the following targets are currently not supported by Kotlin?

A) LLVM B) .NET CLR C) Javascript D) None of These

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Answer & Solution

Answer: Option B

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56

Which of the following constructors are available in Kotlin?

A) Primary constructor B) Secondary constructor C) Both A & B D) None of These

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Answer & Solution

Answer: Option C

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57

You have created an array to hold three strings. When you run the code below, the compiler displays an error. Why does the code fail?

val names = arrayOf(3) names[3]= "Delta"

A) Arrays use zero-based indexes. The value 3 is outside of the array's bounds B) You accessed the element with an index but should have used .set() C) You declared the array with val but should have used var D) You cannot change the value of an element of an array. You should have used a mutable list

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Answer & Solution

Answer: Option A

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58

Which keyword is used to define an immutable variable?

A) var B) val C) immulvar D) immutableVar

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Answer & Solution

Answer: Option B

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59

Is Kotlin interoperable with Java programming language?

A) Yes, it is interoperable B) No, it is not interoperable

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Answer & Solution

Answer: Option A

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60

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

A) Range B) Sealed Class C) Elvis Operator D) Lambda Function

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Answer & Solution

Answer: Option C

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