Rust MCQs with answers Page - 19

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 of the following is true about traits in Rust?

  • (A) Traits are similar to interfaces
  • (B) Traits cannot have methods
  • (C) Traits are used only for debugging
  • (D) Traits can only be used with structs

A

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Q. What does unwrap_or() do in Rust?

  • (A) Always panics
  • (B) Returns an Option
  • (C) Returns the value or a default if None
  • (D) Converts the type

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Q. Which type is used to create atomic reference counting in multi-threaded Rust?

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

A

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Q. What is required to mutate a borrowed variable?

  • (A) Clone the variable
  • (B) Use RefCell<T>
  • (C) Use &mut reference
  • (D) Use Rc<T>

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Q. What does the ? operator do in Rust?

  • (A) Matches a pattern
  • (B) Handles errors by propagating them
  • (C) Makes a value optional
  • (D) Converts an Option to a Result

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Q. What is the size of a unit type in Rust?

  • (A) 1 byte
  • (B) 0 bytes
  • (C) Depends on the system
  • (D) Cannot be determined

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Q. Which syntax correctly defines a tuple?

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

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Q. What happens when a panic occurs in Rust?

  • (A) Program hangs
  • (B) Program continues
  • (C) Thread unwinds or aborts
  • (D) Compiler ignores it

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Q. Which method consumes an iterator and collects the results into a Vec?

  • (A) to_vec()
  • (B) gather()
  • (C) collect()
  • (D) combine()

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Q. Which operator is used to dereference a pointer in Rust?

  • (A) &
  • (B) @
  • (C) *
  • (D) ^

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