WebAssembly Quiz - MCQ - Multiple Choice Questions

WebAssembly (Wasm) is a low-level binary format that allows code to run at near-native speed in web browsers. It is designed as a compilation target for programming languages like C, C++, and Rust, enabling high-performance applications to run on the web.

This quiz will test your understanding of basic WebAssembly concepts, its role in web development, and how it interacts with other web technologies.

Let’s get started with these multiple-choice questions (MCQs) to test your knowledge of WebAssembly.

1. What is WebAssembly (Wasm)?

a) A high-level programming language

b) A low-level binary format for web browsers

c) A database management system

d) A front-end framework for web development

Answer:

b) A low-level binary format for web browsers

Explanation:

WebAssembly (Wasm) is a low-level binary format that runs in web browsers, enabling near-native performance for web applications.

2. Which languages can be compiled into WebAssembly?

a) JavaScript

b) C, C++, Rust

c) HTML and CSS

d) SQL

Answer:

b) C, C++, Rust

Explanation:

Languages like C, C++, and Rust can be compiled into WebAssembly, enabling high-performance code to run in web browsers.

3. How does WebAssembly run in the browser?

a) It runs directly on the CPU

b) It runs in a virtual machine

c) It is interpreted by the browser's JavaScript engine

d) It runs as part of the DOM

Answer:

b) It runs in a virtual machine

Explanation:

WebAssembly runs inside a virtual machine embedded in modern web browsers, providing a secure and performant execution environment.

4. Which of the following is a benefit of using WebAssembly?

a) It allows direct DOM manipulation

b) It enables high-performance code execution

c) It replaces JavaScript completely

d) It is not supported by modern browsers

Answer:

b) It enables high-performance code execution

Explanation:

WebAssembly allows near-native performance in web applications, making it suitable for tasks like video editing, gaming, and other computation-heavy tasks.

5. Is WebAssembly designed to replace JavaScript?

a) Yes, WebAssembly will fully replace JavaScript

b) No, WebAssembly complements JavaScript

c) Only for front-end development

d) Only for server-side programming

Answer:

b) No, WebAssembly complements JavaScript

Explanation:

WebAssembly is designed to complement JavaScript, enabling developers to use both technologies together to build faster and more efficient web applications.

6. What file extension is used for WebAssembly binaries?

a) .wasm

b) .wbin

c) .webasm

d) .wat

Answer:

a) .wasm

Explanation:

WebAssembly binaries use the .wasm file extension.

7. How is WebAssembly integrated into web applications?

a) By embedding it directly in HTML

b) By importing it as a JavaScript module

c) By compiling it in the browser

d) By running it inside a web worker

Answer:

b) By importing it as a JavaScript module

Explanation:

WebAssembly modules can be imported and executed in a web application using JavaScript's WebAssembly API.

8. What does WebAssembly Text Format (WAT) represent?

a) A compiled WebAssembly file

b) A human-readable format for WebAssembly binaries

c) A JavaScript framework for Wasm

d) A debugger tool for Wasm

Answer:

b) A human-readable format for WebAssembly binaries

Explanation:

WebAssembly Text Format (WAT) is a human-readable representation of WebAssembly binary files, making it easier for developers to read and understand the underlying code.

9. Which of the following is a primary use case for WebAssembly?

a) Basic HTML page rendering

b) High-performance applications like games and video editing

c) Styling web pages with CSS

d) Building simple websites

Answer:

b) High-performance applications like games and video editing

Explanation:

WebAssembly is primarily used for high-performance applications like games, video editing, and other tasks that require near-native speed.

10. Can WebAssembly directly manipulate the DOM?

a) Yes, it can directly manipulate the DOM

b) No, WebAssembly must interact with the DOM through JavaScript

c) Only in certain browsers

d) WebAssembly cannot interact with the DOM

Answer:

b) No, WebAssembly must interact with the DOM through JavaScript

Explanation:

WebAssembly does not have direct access to the DOM. Instead, it interacts with the DOM through JavaScript, allowing for integration with existing web technologies.

11. Is WebAssembly supported by all modern web browsers?

a) Yes, WebAssembly is supported by all major browsers

b) No, only Chrome supports WebAssembly

c) No, WebAssembly requires a special plugin

d) Only mobile browsers support WebAssembly

Answer:

a) Yes, WebAssembly is supported by all major browsers

Explanation:

WebAssembly is supported by all modern browsers, including Chrome, Firefox, Edge, and Safari.

12. Can WebAssembly be used in non-web environments?

a) Yes, it can be used in non-web environments like Node.js

b) No, WebAssembly is limited to browsers

c) Only on mobile apps

d) Only on server-side platforms

Answer:

a) Yes, it can be used in non-web environments like Node.js

Explanation:

WebAssembly can be used outside of the browser, such as in server-side environments like Node.js for high-performance computations.

13. What is the primary goal of WebAssembly?

a) To replace JavaScript

b) To enable near-native performance for web applications

c) To build mobile apps

d) To replace web browsers

Answer:

b) To enable near-native performance for web applications

Explanation:

The primary goal of WebAssembly is to enable high-performance applications, like games and video processing, to run efficiently in the browser with near-native performance.

14. Which of the following tools can compile C/C++ code into WebAssembly?

a) npm

b) Emscripten

c) Visual Studio

d) WebStorm

Answer:

b) Emscripten

Explanation:

Emscripten is a popular toolchain that compiles C and C++ code into WebAssembly, enabling high-performance applications to run in the browser.

15. Which of the following is a limitation of WebAssembly?

a) It cannot handle computationally intensive tasks

b) It cannot access browser features like localStorage directly

c) It cannot be used with JavaScript

d) It cannot be used for mobile development

Answer:

b) It cannot access browser features like localStorage directly

Explanation:

WebAssembly cannot directly access browser-specific features like the DOM or localStorage; instead, it relies on JavaScript for such interactions.

These questions cover the essential concepts of WebAssembly, including its use cases, advantages, and limitations. Understanding WebAssembly is key to building high-performance web applications.