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Here are 10 multiple-choice questions (MCQs) with their respective answers for Rust programming:

Which of the following best describes Rust’s primary focus?
A) Performance
B) Simplicity
C) Safety
D) Portability
Answer: C) Safety

What feature of Rust helps prevent null pointer dereferencing?
A) Option type
B) Result type
C) Ownership system
D) Borrowing
Answer: A) Option type

What is Rust’s mechanism for managing memory and preventing memory-related bugs?
A) Garbage collection
B) Reference counting
C) Borrowing and lifetimes
D) Automatic memory allocation
Answer: C) Borrowing and lifetimes

Which keyword in Rust is used to create a new variable binding?
A) let
B) var
C) const
D) def
Answer: A) let

What is the Rust programming language’s build system called?
A) Cargo
B) RustBuild
C) RustC
D) RustBuildSystem
Answer: A) Cargo

Which Rust feature ensures that only one reference can write to data at any given time?
A) Mutable references
B) Ownership
C) Borrowing
D) Mutexes
Answer: A) Mutable references

What does Rust’s ownership system enforce to manage memory safety?
A) Reference counting
B) Smart pointers
C) Ownership and borrowing rules
D) Automatic memory deallocation
Answer: C) Ownership and borrowing rules

Which of the following is a macro in Rust that prints text to the console?
A) log!
B) print!
C) debug!
D) println!
Answer: D) println!

What Rust feature allows multiple immutable references or one mutable reference at a time?
A) Locking
B) Borrowing
C) Synchronization
D) Concurrency
Answer: B) Borrowing

What is the Rust feature that ensures functions cannot access data after the owner is deleted or out of scope?
A) Lifetimes
B) Borrow checker
C) Ownership system
D) Mutexes
Answer: C) Ownership system