Rust MCQs with answers Page - 28

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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S

Shyam Dubey • 3.70K Points
Extraordinary

Q. Which trait is required to use a type in a HashMap key?

  • (A) Display
  • (B) Hash
  • (C) Clone
  • (D) Copy

S

Shyam Dubey • 3.70K Points
Extraordinary

Q. Which keyword is used to create a lifetime parameter?

  • (A) lifetime
  • (B) &life
  • (C) 'a
  • (D) $life

S

Shyam Dubey • 3.70K Points
Extraordinary

Q. What happens when a program uses an invalid reference?

  • (A) Compile-time error
  • (B) Silent failure
  • (C) Runtime warning
  • (D) Undefined behavior

S

Shyam Dubey • 3.70K Points
Extraordinary

Q. Which of these allows interior mutability?

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

S

Shyam Dubey • 3.70K Points
Extraordinary

Q. Which type of closure takes ownership of captured variables?

  • (A) |x| x + 1
  • (B) move |x| x + 1
  • (C) &|x| x + 1
  • (D) *|x| x + 1

S

Shyam Dubey • 3.70K Points
Extraordinary

Q. Which macro is commonly used for unit testing?

  • (A) unit_test!
  • (B) check!
  • (C) test!
  • (D) #[test]

R

Ravina • 3.96K Points
Extraordinary

Q. What is the purpose of the `dyn` keyword in Rust?

  • (A) Defines a dynamic variable
  • (B) Specifies a trait object
  • (C) Creates a macro
  • (D) Marks a function as dynamic

R

Ravina • 3.96K Points
Extraordinary

Q. Which trait is required to use the `==` operator?

  • (A) Copy
  • (B) Ord
  • (C) PartialEq
  • (D) Eq

R

Ravina • 3.96K Points
Extraordinary

Q. Which macro is used to include the contents of a file as a string?

  • (A) read_file!
  • (B) include_str!
  • (C) include!
  • (D) read_str!

R

Ravina • 3.96K Points
Extraordinary

Q. Which type is used to represent a slice of data?

  • (A) &str
  • (B) &[T]
  • (C) &Vec<T>
  • (D) &Box<T>

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