Here are Top 25 multiple-choice questions (MCQs) focused on the HTML5 features and elements in Web Performance Optimization MCQs, along with their answers and explanations.
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1. What is the primary goal of performance profiling in web development?
- To slow down website loading times
- To improve website aesthetics
- To identify and fix performance bottlenecks
- To add visual effects to web pages
The primary goal of performance profiling is to identify and fix performance bottlenecks in a web application.
2. Which tool is commonly used for JavaScript profiling and performance optimization in web development?
- Photoshop
- Google Chrome DevTools
- MySQL
- Notepad
Google Chrome DevTools is commonly used for JavaScript profiling and performance optimization in web development.
3. What is the purpose of minification in web performance optimization?
- To increase file sizes
- To reduce file sizes for faster loading
- To slow down website loading times
- To improve website aesthetics
Minification aims to reduce file sizes for faster website loading.
4. What is a common technique to optimize images for web performance?
- Adding watermarks
- Reducing image dimensions
- Increasing image quality
- Using BMP format
Optimizing images often involves reducing their dimensions to reduce file size.
5. Which of the following is not a common technique for web performance optimization?
- Caching
- Content delivery networks (CDNs)
- Adding watermarks to images
- Code minification
Adding watermarks to images is not a common web performance optimization technique.
6. What is a common technique to reduce the number of HTTP requests in web development?
- Code minification
- Adding watermarks to images
- Increasing image dimensions
- Using BMP format
Code minification helps reduce the number of HTTP requests by reducing file sizes.
7. What is the purpose of lazy loading images in web development?
- To increase website traffic
- To add watermarks to images
- To slow down website loading times
- To improve initial page loading speed
Lazy loading images improves initial page loading speed by loading images only when needed.
8. What is a common technique to reduce server response times in web development?
- Code minification
- Optimizing database queries
- Adding watermarks to images
- Increasing image dimensions
Optimizing database queries is a common technique to reduce server response times.
9. What is the primary benefit of using a CDN for content delivery in web development?
- Adding watermarks to images
- Reducing website traffic
- Faster content delivery to users
- Slowing down website loading times
The primary benefit of using a CDN is faster content delivery to users.
10. What is the primary purpose of code splitting in web development?
- To add watermarks to images
- To reduce file sizes
- To increase website traffic
- To improve initial page loading speed
Code splitting aims to improve initial page loading speed by loading only essential code.
11. What does the "Critical Rendering Path" refer to in web performance optimization?
- The path to accessing website resources
- The path to adding watermarks to images
- The sequence of steps required to render a webpage
- The path to increasing image dimensions
The Critical Rendering Path is the sequence of steps required to render a webpage in a browser.
12. Which of the following is a common technique to optimize web fonts for performance?
- Increasing font size
- Using BMP format for fonts
- Subsetting and compressing fonts
- Adding watermarks to fonts
Subsetting and compressing fonts are common techniques to optimize web fonts for performance.
13. What is the purpose of "tree shaking" in JavaScript code optimization?
- To add watermarks to images
- To remove unused code from the final bundle
- To increase file sizes
- To improve website aesthetics
Tree shaking is the process of removing unused code from the final JavaScript bundle.
14. What is the primary benefit of using responsive web design for web performance optimization?
- Slower website loading times
- Improved server performance
- Increased image dimensions
- Consistent user experience across devices
Responsive web design provides a consistent user experience across devices and screen sizes.
15. What is the purpose of "defer" and "async" attributes in script tags in HTML?
- To add watermarks to images
- To improve website aesthetics
- To control script execution and loading
- To increase file sizes
The "defer" and "async" attributes in script tags control script execution and loading in HTML.
16. What is the primary purpose of "content compression" in web performance optimization?
- To slow down website loading times
- To improve website aesthetics
- To reduce file sizes for faster loading
- To add watermarks to web pages
Content compression reduces file sizes for faster loading.
17. What is a common technique to optimize the loading of JavaScript files for web performance?
- Using the "async" attribute
- Increasing JavaScript file size
- Adding watermarks to JavaScript files
- Loading JavaScript files synchronously
Using the "async" attribute is a common technique to optimize the loading of JavaScript files.
18. What is a common technique to optimize web performance by reducing the number of HTTP requests?
- Code minification
- Adding watermarks to images
- Increasing image dimensions
- Using BMP format
Code minification helps reduce the number of HTTP requests by reducing file sizes.
19. What is the purpose of "caching" in web performance optimization?
- To increase file sizes
- To improve website aesthetics
- To store and reuse web resources
- To add watermarks to web pages
Caching involves storing and reusing web resources to improve performance.
20. What is a common technique to optimize the loading of CSS files for web performance?
- Using the "async" attribute
- Increasing CSS file size
- Adding watermarks to CSS files
- Inlining critical CSS
Inlining critical CSS is a common technique to optimize the loading of CSS files.
21. What is the primary benefit of using a service worker in web development?
- To slow down website loading times
- To add watermarks to web resources
- To improve website aesthetics
- To provide offline and caching capabilities
Service workers provide offline and caching capabilities in web development.
22. What is the purpose of "resource preloading" in web performance optimization?
- To slow down website loading times
- To increase file sizes
- To load resources in advance of user interaction
- To add watermarks to web resources
Resource preloading involves loading resources in advance of user interaction to improve performance.
23. What is a common technique to optimize web performance by reducing unnecessary redirects?
- Increasing the number of redirects
- Decreasing the number of redirects
- Adding watermarks to web resources
- Using BMP format for redirects
Optimizing web performance involves reducing unnecessary redirects.
24. What is the primary goal of web performance optimization techniques?
- To increase website traffic
- To slow down website loading times
- To improve website speed and user experience
- To add watermarks to web resources
The primary goal of web performance optimization techniques is to improve website speed and user experience.
25. What is the purpose of the "preload" attribute in web performance optimization?
- To increase file sizes
- To slow down website loading times
- To instruct the browser to preload a resource
- To add watermarks to web resources
The "preload" attribute instructs the browser to preload a resource for better performance.
