Web Performance Optimization Quiz: Test Your Skills

Question 1

Which image optimization techniques effectively contribute to faster web page loading?

Accepted Answer

Eager loading and lazy loading

Accepted Answer

Implementing CSS sprites

Answer

Solely using SVG images

Question 2

Which code optimization technique combines multiple scripts or styles into a single file to reduce HTTP requests?

Accepted Answer

Minification

Answer

Caching

Answer

Image optimization

Answer

Database optimization

Question 3

What type of image optimization technique involves reducing the number of colors used in an image?

Accepted Answer

Quantization

Answer

Lossy compression

Answer

Lossless compression

Answer

Dithering

Question 4

What is the purpose of using a preloader in web applications?

Accepted Answer

To display a loading animation while content is being fetched

Answer

To cache frequently accessed data in memory

Answer

To minify CSS and JavaScript files

Answer

To optimize images for different devices

Question 5

How does HTTP/2's header compression improve page loading speed?

Accepted Answer

Reduces header size, decreasing data transmission and speeding up loading.

Answer

Affects HTML documents only, not other resources.

Answer

Is optional and effectiveness depends on header content.

Answer

Benefits websites with a small number of files.

Question 6

Which of the following is NOT a benefit of web caching?

Accepted Answer

Conserved bandwidth usage

Answer

Reduced server load

Answer

Improved page load speed

Answer

Enhanced user experience

Question 7

What is the primary objective of minification?

Accepted Answer

Reducing file size

Answer

Enhancing code readability

Answer

Optimizing database queries

Answer

Improving accessibility

Question 8

Which image format generally offers the optimal balance of file size and image quality?

Accepted Answer

JPEG

Answer

PNG

Answer

GIF

Answer

TIFF

Question 9

Define a Content Delivery Network (CDN).

Accepted Answer

A network of servers that deliver web content from multiple locations

Answer

A software program that optimizes page loading times

Answer

A tool for monitoring website performance

Answer

A protocol for secure web traffic

Question 10

What is the purpose of 'gzip' compression?

Accepted Answer

Reducing the size of web pages

Answer

Enhancing image quality

Answer

Improving security

Answer

Optimizing database performance

Question 11

Which is NOT considered a best practice for optimizing CSS performance?

Accepted Answer

Using inline CSS where appropriate

Answer

Using external stylesheets

Answer

Minimizing CSS file size

Answer

Combining multiple CSS files

Question 12

Explain the role of asynchronous JavaScript in website performance.

Accepted Answer

It prevents JavaScript from hindering page loading

Answer

It reduces the number of HTTP requests

Answer

It improves image loading speed

Answer

It optimizes server-side processing

Question 13

Which of the following accurately describes the advantages and disadvantages of lossy and lossless image compression techniques?

Accepted Answer

Lossy compression reduces file size more efficiently, but may introduce noticeable artifacts.

Accepted Answer

Lossless compression maintains image quality without any loss, but the resulting files tend to be larger.

Answer

Lossy compression is always better than lossless compression.

Answer

Lossless compression consistently produces smaller file sizes compared to lossy compression.

Question 14

Which of the following is a primary function of Google PageSpeed Insights and WebPageTest?

Accepted Answer

Analyze page load times and pinpoint performance issues

Answer

Automate website optimization tasks

Answer

Verify website compatibility with different browsers

Answer

Generate performance reports for marketing purposes

Question 15

Which technique significantly reduces the size of CSS and JavaScript files, thereby enhancing page loading times?

Accepted Answer

Minification

Answer

Compression

Answer

Obfuscation

Answer

Transpilation

Question 16

What type of caching stores frequently accessed data in the user's browser, reducing the load on the server and improving page load time?

Accepted Answer

Browser caching

Answer

Database caching

Answer

Proxy caching

Answer

Object caching

Question 17

Which image format generally offers the optimal balance between quality and file size for web applications?

Accepted Answer

JPEG

Answer

PNG

Answer

GIF

Answer

BMP

Question 18

What is the primary advantage of using Content Delivery Networks (CDNs)?

Accepted Answer

Distributing content closer to users, reducing latency, and enhancing performance.

Answer

Enhanced security

Answer

Unlimited bandwidth

Question 19

Which tool is effective in identifying and resolving performance bottlenecks within a web application?

Accepted Answer

Performance profiling

Answer

Code linting

Answer

Syntax highlighting

Answer

Version control

Question 20

What is the purpose of lazy loading images in web development?

Accepted Answer

Delaying the loading of images until they appear in the user's viewport, improving page load time.

Answer

Enhancing image quality

Answer

Preventing image theft

Question 21

What is the direct impact of minifying CSS and JavaScript on a web application?

Accepted Answer

Reduced file size, leading to faster loading times.

Answer

Increased security

Answer

Improved code readability

Question 22

Which performance optimization technique involves merging multiple CSS or JavaScript files into a single file?

Accepted Answer

Concatenation

Answer

Minification

Answer

Image compression

Answer

Lazy loading