Rust MCQs with answers Page - 9

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. Which keyword is used to define a trait implementation for a struct in Rust?

  • (A) interface
  • (B) impl
  • (C) trait
  • (D) struct

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Q. Which keyword is used to define a generic function in Rust?

  • (A) generic
  • (B) fn<T>
  • (C) template
  • (D) typename

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

  • (A) Converts the value into a string
  • (B) Clones the value
  • (C) Converts Option<T> into Option<&T>
  • (D) Converts Option<T> into Result<T, E>

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Q. Which trait must be implemented to allow sorting with `.sort()`?

  • (A) Ord
  • (B) Clone
  • (C) Debug
  • (D) Eq

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Q. What is the purpose of `std::cell::RefCell<T>`?

  • (A) Immutable shared data
  • (B) Compile-time borrow checking
  • (C) Runtime-checked interior mutability
  • (D) Prevent references

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Q. Which of the following best describes `unsafe` in Rust?

  • (A) Turns off all type checks
  • (B) Allows using low-level operations
  • (C) Disables the compiler
  • (D) Used for testing only

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Q. Which of the following is used to define asynchronous functions in Rust?

  • (A) await fn
  • (B) async fn
  • (C) task fn
  • (D) future fn

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Q. What is the purpose of `.await` in Rust?

  • (A) Pauses the program forever
  • (B) Terminates a future
  • (C) Waits for an async operation to complete
  • (D) Starts a new thread

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Q. Which module is required to use file operations in Rust?

  • (A) std::fs
  • (B) std::file
  • (C) std::io::file
  • (D) std::dir

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Q. Which of the following defines a closure in Rust?

  • (A) fn(x) = x + 1;
  • (B) |x| x + 1
  • (C) lambda x: x + 1
  • (D) (x) -> x + 1

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