Interop & Idioms interview questions

12 real Interop & Idioms questions from the Kotlin bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.

1. What is String template?

Junior
  1. A.syntax embedding a variable or expression inside a literal using a dollar sign prefix
  2. B.a marker exposing a companion member as a true static method for Java callers
  3. C.the seamless ability to call existing JVM library code and be called back from it without wrappers
  4. D.syntax that unpacks an object's components into several variables in one statement
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3. Which statement is correct?

Junior
  1. A.String template — syntax that unpacks an object's components into several variables in one statement
  2. B.String template — the seamless ability to call existing JVM library code and be called back from it without wrappers
  3. C.String template — syntax embedding a variable or expression inside a literal using a dollar sign prefix
  4. D.String template — a marker exposing a companion member as a true static method for Java callers
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4. What is Destructuring declaration?

Mid
  1. A.a marker exposing a companion member as a true static method for Java callers
  2. B.syntax that unpacks an object's components into several variables in one statement
  3. C.the seamless ability to call existing JVM library code and be called back from it without wrappers
  4. D.syntax embedding a variable or expression inside a literal using a dollar sign prefix
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6. Which statement is correct?

Mid
  1. A.Destructuring declaration — syntax that unpacks an object's components into several variables in one statement
  2. B.Destructuring declaration — syntax embedding a variable or expression inside a literal using a dollar sign prefix
  3. C.Destructuring declaration — the seamless ability to call existing JVM library code and be called back from it without wrappers
  4. D.Destructuring declaration — a marker exposing a companion member as a true static method for Java callers
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7. What is Java interoperability?

Senior
  1. A.syntax that unpacks an object's components into several variables in one statement
  2. B.syntax embedding a variable or expression inside a literal using a dollar sign prefix
  3. C.a marker exposing a companion member as a true static method for Java callers
  4. D.the seamless ability to call existing JVM library code and be called back from it without wrappers
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8. Which term means: "the seamless ability to call existing JVM library code and be called back from it without wrappers"?

Senior
  1. A.JvmStatic annotation
  2. B.Java interoperability
  3. C.String template
  4. D.Destructuring declaration
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9. Which statement is correct?

Senior
  1. A.Java interoperability — syntax that unpacks an object's components into several variables in one statement
  2. B.Java interoperability — the seamless ability to call existing JVM library code and be called back from it without wrappers
  3. C.Java interoperability — a marker exposing a companion member as a true static method for Java callers
  4. D.Java interoperability — syntax embedding a variable or expression inside a literal using a dollar sign prefix
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10. What is JvmStatic annotation?

Senior
  1. A.the seamless ability to call existing JVM library code and be called back from it without wrappers
  2. B.a marker exposing a companion member as a true static method for Java callers
  3. C.syntax that unpacks an object's components into several variables in one statement
  4. D.syntax embedding a variable or expression inside a literal using a dollar sign prefix
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12. Which statement is correct?

Senior
  1. A.JvmStatic annotation — a marker exposing a companion member as a true static method for Java callers
  2. B.JvmStatic annotation — syntax embedding a variable or expression inside a literal using a dollar sign prefix
  3. C.JvmStatic annotation — syntax that unpacks an object's components into several variables in one statement
  4. D.JvmStatic annotation — the seamless ability to call existing JVM library code and be called back from it without wrappers
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