Rust MCQs with answers Page - 13

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 `Default` trait provide?

  • (A) A way to clone values
  • (B) A default value for a type
  • (C) Formatted output
  • (D) Runtime error propagation

A

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Q. Which method converts a `String` into a `&str`?

  • (A) .parse()
  • (B) .trim()
  • (C) .as_str()
  • (D) .to_str()

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Q. Which trait is used for streaming output formatting?

  • (A) Debug
  • (B) Display
  • (C) Write
  • (D) Clone

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Q. What does the `IntoIterator` trait do?

  • (A) Turns a collection into an iterator
  • (B) Sorts a collection
  • (C) Converts numbers to strings
  • (D) Clones collections

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Q. Which function would you use to convert a string to an integer?

  • (A) str::as_i32()
  • (B) parse::<i32>()
  • (C) int::from_str()
  • (D) to_i32()

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Q. What is the result of `let a = &5;` in Rust?

  • (A) Move the value 5
  • (B) Create a reference to 5
  • (C) Create a mutable reference
  • (D) Create a raw pointer

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Q. Which keyword defines a module in Rust?

  • (A) mod
  • (B) module
  • (C) namespace
  • (D) use

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Q. Which macro should you use to include code from another file?

  • (A) import!
  • (B) include!
  • (C) use!
  • (D) mod!

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Q. Which of the following types guarantees at compile time that only one mutable reference exists?

  • (A) Rc<T>
  • (B) RefCell<T>
  • (C) &mut T
  • (D) Arc<T>

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Q. What happens when a value goes out of scope in Rust?

  • (A) It is moved to the heap
  • (B) It is duplicated
  • (C) Its memory is automatically deallocated
  • (D) It becomes global

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