Rust MCQs with answers Page - 21

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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Shyam Dubey • 3.70K Points
Extraordinary

Q. What does the .len() method return for a string or vector?

  • (A) Number of bytes
  • (B) Number of elements
  • (C) Memory address
  • (D) Last element

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Shyam Dubey • 3.70K Points
Extraordinary

Q. Which collection type maintains insertion order?

  • (A) HashMap
  • (B) HashSet
  • (C) Vec
  • (D) BTreeMap

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Shyam Dubey • 3.70K Points
Extraordinary

Q. Which method is used to create an iterator from a vector?

  • (A) .new()
  • (B) .clone()
  • (C) .iter()
  • (D) .map()

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Shyam Dubey • 3.70K Points
Extraordinary

Q. What does the keyword ref do in a match pattern?

  • (A) Creates a clone
  • (B) Creates a mutable reference
  • (C) Creates an immutable reference
  • (D) Performs recursion

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Shyam Dubey • 3.70K Points
Extraordinary

Q. Which function is used to sleep a thread?

  • (A) thread::delay()
  • (B) thread::sleep()
  • (C) std::wait()
  • (D) pause()

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Shyam Dubey • 3.70K Points
Extraordinary

Q. Which type is used for shared mutability?

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

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Shyam Dubey • 3.70K Points
Extraordinary

Q. What is the main goal of lifetimes in Rust?

  • (A) Runtime memory allocation
  • (B) Garbage collection
  • (C) Prevent dangling references
  • (D) Faster performance

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Shyam Dubey • 3.70K Points
Extraordinary

Q. Which of the following is a correct lifetime annotation?

  • (A) 'lifetime
  • (B) &'a str
  • (C) &str'a
  • (D) str:'a

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Shyam Dubey • 3.70K Points
Extraordinary

Q. What does the static keyword mean when used with a variable?

  • (A) Stored on the stack
  • (B) Thread-local value
  • (C) Value lives for the entire duration of the program
  • (D) Value can’t be mutated

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Shyam Dubey • 3.70K Points
Extraordinary

Q. Which keyword is used for asynchronous functions?

  • (A) await
  • (B) sync
  • (C) async
  • (D) concurrent

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