Rust MCQs with answers Page - 10

Here, you will find a collection of MCQ questions on Rust. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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Q. What does `.map()` do on an Option type?

  • (A) Converts Option into Result
  • (B) Applies a function to the value if it is Some
  • (C) Clones the value
  • (D) Returns the same Option

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Q. Which method can be used to combine two iterators in Rust?

  • (A) join()
  • (B) merge()
  • (C) zip()
  • (D) group()

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Q. Which keyword is used to break from a loop in Rust?

  • (A) stop
  • (B) break
  • (C) exit
  • (D) return

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Q. What will `None.unwrap()` do?

  • (A) Return None
  • (B) Return an error code
  • (C) Panic at runtime
  • (D) Convert to zero

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Q. What is the return type of `async fn` in Rust?

  • (A) Future
  • (B) Thread
  • (C) Option
  • (D) Result

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Q. Which type allows interior mutability in Rust?

  • (A) Box<T>
  • (B) RefCell<T>
  • (C) Rc<T>
  • (D) Option<T>

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Q. Which standard trait allows you to compare two values for equality?

  • (A) Ord
  • (B) Eq
  • (C) PartialEq
  • (D) Compare

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Q. What does the `drop` function do in Rust?

  • (A) Deletes the variable
  • (B) Forces the value to be dropped (deallocated) immediately
  • (C) Increments the reference count
  • (D) Freezes the variable

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Q. Which type is used to share mutable state across threads?

  • (A) Box<T>
  • (B) Rc<T>
  • (C) Arc<Mutex<T>>
  • (D) RefCell<T>

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Q. Which macro is used to define unit tests in Rust?

  • (A) unit!
  • (B) check!
  • (C) test!
  • (D) #[test]

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