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 code minification in web development?
- To improve website aesthetics
- To make code easier to read
- To reduce the size of code files
- To enhance website security
The primary goal of code minification is to reduce the size of code files, leading to faster website loading.
2. Which of the following types of files are commonly minified in web development?
- Images
- HTML files
- Video files
- Audio files
HTML files are commonly minified to reduce their size.
3. What is the purpose of JavaScript minification?
- To improve code readability
- To make code files larger
- To reduce the size of JavaScript files
- To remove all JavaScript code
JavaScript minification is used to reduce the size of JavaScript files.
4. Which of the following is not a common JavaScript minification technique?
- Removing whitespace and comments
- Renaming variables to shorter names
- Adding extra line breaks
- Shortening function names
Adding extra line breaks is not a common JavaScript minification technique.
5. What does GZIP compression primarily target in web optimization?
- Minifying JavaScript
- Reducing image sizes
- Compressing text-based resources
- Improving website aesthetics
GZIP compression primarily targets the compression of text-based resources, such as HTML, CSS, and JavaScript files.
6. What is the primary benefit of using GZIP compression for web resources?
- Increasing the size of files
- Speeding up website loading times
- Making files more readable
- Improving website security
The primary benefit of GZIP compression is to speed up website loading times by reducing file sizes.
7. Which HTTP response header is commonly used to enable GZIP compression for web resources?
- Content-Type
- Content-Encoding
- Cache-Control
- Expires
The "Content-Encoding" HTTP response header is commonly used to enable GZIP compression for web resources.
8. Which image format is known for its lossless compression and is commonly used for web development?
- JPEG
- PNG
- GIF
- WebP
PNG is known for its lossless compression and is commonly used for web development when lossless quality is required.
9. Which of the following is not a common image optimization technique for web development?
- Reducing image dimensions
- Applying lossy compression
- Using responsive images
- Increasing image resolution
Increasing image resolution is not a common image optimization technique for web development.
10. What is the purpose of "minification" in the context of web development?
- To increase the size of code files
- To improve website aesthetics
- To reduce the size of code files
- To enhance website security
In web development, "minification" is the process of reducing the size of code files.
11. Which of the following is not a common minification technique for CSS files?
- Removing whitespace and comments
- Combining multiple CSS files into one
- Renaming selectors to longer names
- Shortening property names
Renaming selectors to longer names is not a common minification technique for CSS files.
12. What is the primary purpose of image compression in web development?
- To increase image dimensions
- To make images look worse
- To reduce image file size
- To slow down website loading times
The primary purpose of image compression in web development is to reduce image file size, improving website loading times.
13. Which HTTP status code indicates a successful request for a GZIP-compressed resource?
- 200 OK
- 304 Not Modified
- 404 Not Found
- 503 Service Unavailable
The HTTP status code "200 OK" indicates a successful request for a GZIP-compressed resource.
14. Which of the following is not a common minification technique for HTML files?
- Removing whitespace and comments
- Shortening attribute names
- Combining multiple HTML files into one
- Renaming HTML elements to longer names
Renaming HTML elements to longer names is not a common minification technique for HTML files.
15. What is the primary goal of image optimization in web development?
- To make images larger
- To improve image quality
- To reduce image file size
- To add visual effects to images
The primary goal of image optimization in web development is to reduce image file size, enhancing website performance.
16. Which type of image compression removes some image data permanently to reduce file size?
- Lossless compression
- Lossy compression
- GZIP compression
- PNG compression
Lossy compression removes some image data permanently to reduce file size, typically used for JPEG images.
17. What is the primary purpose of minifying HTML, CSS, and JavaScript files in web development?
- To make the code more readable
- To improve website aesthetics
- To reduce the size of code files
- To increase file sizes
The primary purpose of minifying HTML, CSS, and JavaScript files is to reduce their size, leading to faster website loading.
18. Which of the following is not a common image format used for web development?
- JPEG
- GIF
- BMP
- WebP
BMP is not a common image format used for web development due to its large file size.
19. Which web performance optimization technique involves loading only the visible part of a webpage initially?
- Code minification
- Image optimization
- Lazy loading
- GZIP compression
Lazy loading involves loading only the visible part of a webpage initially, improving loading times.
20. Which of the following is not a commonly used tool for code minification in web development?
- UglifyJS
- Terser
- Photoshop
- CSSNano
Photoshop is not a commonly used tool for code minification in web development.
21. Which of the following is a lossless image format used for web development?
- JPEG
- GIF
- WebP
- BMP
GIF is a lossless image format used for web development.
22. What is the primary purpose of GZIP compression in web development?
- To improve image quality
- To increase file sizes
- To reduce file sizes for faster loading
- To add visual effects to images
The primary purpose of GZIP compression in web development is to reduce file sizes for faster loading.
23. Which type of image compression retains all image data and does not result in any loss of quality?
- Lossless compression
- Lossy compression
- GZIP compression
- JPEG compression
Lossless compression retains all image data and does not result in any loss of quality.
24. What is the primary benefit of lazy loading images on a website?
- Slower loading times
- Faster initial page rendering
- Increased image dimensions
- Improved image quality
The primary benefit of lazy loading images is faster initial page rendering, especially on large or image-heavy websites.
25. Which type of file is commonly minified in web development to improve website performance?
- Video files
- JavaScript files
- Audio files
- Executable files
JavaScript files are commonly minified in web development to improve website performance by reducing their size.
