Rust MCQs with answers Page - 15

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 the `String::from("hello")` function do?

  • (A) Returns a static string
  • (B) Creates a new `&str`
  • (C) Creates a heap-allocated `String`
  • (D) Returns a `char`

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Q. Which keyword is used to return a value from a function in Rust?

  • (A) exit
  • (B) ret
  • (C) return
  • (D) end

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Q. What is the default behavior of Rust when accessing an index out of bounds in a vector?

  • (A) Returns None
  • (B) Panic at runtime
  • (C) Wraps around
  • (D) Returns -1

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Q. Which Rust macro asserts that a condition is true?

  • (A) assume!
  • (B) expect!
  • (C) assert!
  • (D) check!

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Q. What is the result of `Some(5).unwrap_or(10)`?

  • (A) 10
  • (B) 5
  • (C) None
  • (D) Error

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Q. Which standard trait allows conversion from one type to another?

  • (A) From
  • (B) Convert
  • (C) Into
  • (D) Map

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Q. Which function checks if a vector is empty?

  • (A) is_none()
  • (B) check()
  • (C) empty()
  • (D) is_empty()

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Q. What is the result of the expression `vec![1, 2, 3].contains(&2)`?

  • (A) false
  • (B) true
  • (C) Error
  • (D) None

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Q. Which macro is used to write formatted output to the console?

  • (A) printline!
  • (B) write!
  • (C) log!
  • (D) println!

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Q. What is the main difference between `Box<T>` and `Rc<T>`?

  • (A) `Box` allows multiple ownership, `Rc` doesn't
  • (B) `Box` is for shared ownership, `Rc` is for unique ownership
  • (C) `Box` is for unique ownership, `Rc` is for shared ownership
  • (D) They are identical

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