Rust MCQ Questions with answers and solutions Page 2

Q. What is the purpose of the 'cargo' tool in Rust?

(A) Memory management
(B) Code formatting
(C) Package management and building
(D) Debugging

💬 Discuss

✅ Correct Answer: (C) Package management and building

Explanation: 'cargo' is Rust's package manager and build system.

Published by Admin ⭐ 38.23K Points at 26-Sep-2025 08:00 pm in Rust

Q. Which of the following is a valid way to print to the console in Rust?

(A) echo("Hello")
(B) print("Hello")
(C) println!("Hello")
(D) console.log("Hello")

💬 Discuss

✅ Correct Answer: (C) println!("Hello")

Explanation: Rust uses the macro 'println!' to print to the console.

Published by Admin ⭐ 38.23K Points at 26-Sep-2025 08:00 pm in Rust

Q. What is the result of the following code?

Code:

fn main() {
    let s = String::from("hello");
    let t = s;
    println!("{}", s);
}

(A) hello
(B) Compilation error
(C) Undefined behavior
(D) Nothing

💬 Discuss

✅ Correct Answer: (B) Compilation error

Explanation: Ownership of 's' is moved to 't', so 's' is no longer valid.

Published by Admin ⭐ 38.23K Points at 26-Sep-2025 08:00 pm in Rust

Q. Which keyword is used to return a value from a function in Rust?

(A) return
(B) yield
(C) break
(D) exit

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✅ Correct Answer: (A) return

Explanation: Rust uses 'return' to return values from functions.

Published by Admin ⭐ 38.23K Points at 26-Sep-2025 08:00 pm in Rust

Q. What is the purpose of the 'Result' type in Rust?

(A) To store strings
(B) To handle errors
(C) To define structs
(D) To manage memory

💬 Discuss

✅ Correct Answer: (B) To handle errors

Explanation: 'Result' is used for error handling and represents success or failure.

Published by Admin ⭐ 38.23K Points at 26-Sep-2025 08:00 pm in Rust

Q. Which of the following is a valid way to define a struct in Rust?

(A) struct MyStruct { name: String }
(B) class MyStruct { name: String }
(C) type MyStruct = { name: String }
(D) object MyStruct { name: String }

💬 Discuss

✅ Correct Answer: (A) struct MyStruct { name: String }

Explanation: Rust uses the 'struct' keyword to define custom data types.

Published by Admin ⭐ 38.23K Points at 26-Sep-2025 08:00 pm in Rust

Q. What is the output of this code?

Code:

fn main() {
    let x = vec![1, 2, 3];
    println!("{}", x[1]);
}

(A) 1
(B) 2
(C) 3
(D) Compilation error

💬 Discuss

✅ Correct Answer: (B) 2

Explanation: Indexing starts at 0, so x[1] is 2.

Published by Admin ⭐ 38.23K Points at 26-Sep-2025 08:00 pm in Rust

Q. Which keyword is used to implement traits in Rust?

(A) trait
(B) impl
(C) interface
(D) define

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✅ Correct Answer: (B) impl

Explanation: Rust uses 'impl' to implement traits for types.

Published by Admin ⭐ 38.23K Points at 26-Sep-2025 08:00 pm in Rust

Q. What does the 'unwrap()' method do on a Result type?

(A) Returns the error
(B) Returns the value or panics
(C) Ignores the value
(D) Converts to Option

💬 Discuss

✅ Correct Answer: (B) Returns the value or panics

Explanation: 'unwrap()' returns the value if Ok, or panics if Err.

Published by Admin ⭐ 38.23K Points at 26-Sep-2025 08:00 pm in Rust

Q. Which of the following is a macro in Rust?

(A) print
(B) println!
(C) format
(D) debug

💬 Discuss

✅ Correct Answer: (B) println!

Explanation: Macros in Rust are marked with a '!' like 'println!'.

Published by Admin ⭐ 38.23K Points at 26-Sep-2025 08:00 pm in Rust

Rust MCQs with answers Page - 2

Q. What is the purpose of the 'cargo' tool in Rust?

Q. Which of the following is a valid way to print to the console in Rust?

Q. What is the result of the following code?

Q. Which keyword is used to return a value from a function in Rust?

Q. What is the purpose of the 'Result' type in Rust?

Q. Which of the following is a valid way to define a struct in Rust?

Q. What is the output of this code?

Q. Which keyword is used to implement traits in Rust?

Q. What does the 'unwrap()' method do on a Result type?

Q. Which of the following is a macro in Rust?

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