Rust MCQs with answers Page - 16

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 type in Rust can be used to handle operations that might fail?

  • (A) Option<T>
  • (B) Error<T>
  • (C) Try<T>
  • (D) Result<T, E>

A

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Q. What does the `unwrap()` method do on a Result or Option?

  • (A) Returns a default value
  • (B) Prints the value
  • (C) Returns the value or panics if it's an error or None
  • (D) Ignores the value

A

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Q. Which of these is a zero-cost abstraction in Rust?

  • (A) Smart pointers
  • (B) Traits
  • (C) Closures
  • (D) All of the above

A

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Q. What happens when two mutable references exist simultaneously in Rust?

  • (A) Compile-time error
  • (B) One is dropped
  • (C) Both succeed
  • (D) Runtime panic

A

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Q. Which operator is used to pattern match in Rust?

  • (A) =
  • (B) ->
  • (C) =>
  • (D) match

A

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Q. What does `String::new()` return?

  • (A) An empty string
  • (B) A static string
  • (C) A null pointer
  • (D) A formatted string

A

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Q. Which is the correct way to define a tuple in Rust?

  • (A) [1, 2]
  • (B) {1, 2}
  • (C) (1, 2)
  • (D) <1, 2>

A

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Q. Which type of variable can be reassigned in Rust?

  • (A) let
  • (B) const
  • (C) mut
  • (D) static

A

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Q. What is the purpose of `.expect()` in Rust?

  • (A) Ignores error silently
  • (B) Prints error and panics with custom message
  • (C) Retries the operation
  • (D) Always unwraps safely

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Q. Which trait is required for a type to be formatted using {:?}?

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

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