Rust MCQs with answers Page - 3

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. What is the purpose of the `mut` keyword in Rust?

  • (A) Marks a function as mutable
  • (B) Marks a variable as mutable
  • (C) Changes data type
  • (D) Imports a module

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Q. Which data type in Rust can store a dynamically sized string?

  • (A) &str
  • (B) String
  • (C) char
  • (D) str

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Q. Which Rust feature prevents data races at compile time?

  • (A) Garbage collection
  • (B) Ownership model
  • (C) Null pointers
  • (D) Thread pools

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Q. Which of the following is a valid function declaration in Rust?

  • (A) function greet() {}
  • (B) fn greet() {}
  • (C) def greet() {}
  • (D) func greet() {}

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Q. What will `vec![1, 2, 3]` create?

  • (A) A tuple
  • (B) A set
  • (C) A vector
  • (D) A string

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Q. What is the default behavior of variables in Rust?

  • (A) Mutable
  • (B) Constant
  • (C) Global
  • (D) Immutable

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Q. Which collection type allows key-value pairs in Rust?

  • (A) Vec
  • (B) Tuple
  • (C) HashMap
  • (D) Array

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Q. What is the result type of a function that doesn't return anything?

  • (A) None
  • (B) null
  • (C) ()
  • (D) void

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Q. What is the purpose of `impl` block in Rust?

  • (A) To import external packages
  • (B) To define function interfaces
  • (C) To implement methods for a struct or trait
  • (D) To execute main function

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Q. Which of the following is NOT a valid Rust macro?

  • (A) println!
  • (B) format!
  • (C) vec!
  • (D) list!

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