What is the purpose of using external JavaScript files?
A). To keep HTML and JavaScript code separate
B). To reuse the JavaScript code on multiple pages
C). To improve the maintainability of the code
D). All of the above
Can an external JavaScript file contain HTML?
A). Yes
B). No
C). Only if it is within a <container><script></container> tag
D). Only if it is within a <container><body></container> tag
What is the difference between the defer and async attributes in the <container><script></container> tag?
A). defer delays execution until after the HTML document is fully parsed, while async executes as soon as it is downloaded
B). defer executes the script immediately, while async delays execution until after HTML parsing is complete
C). defer and async both delay script execution until after HTML parsing is complete
D). There is no difference between defer and async attributes
What is the effect of using the defer attribute in the <container><script></container> tag?
A). The script will be executed after the HTML document has been fully parsed
B). The script will be executed as soon as it is downloaded
C). The script will not be executed
D). The script will be executed before the HTML document is parsed
How can you include multiple external JavaScript files in a web page?
A). Use multiple <container><script></container> tags
B). Separate file names with commas
C). Separate file names with semicolons
D). Use a single <container><script></container> tag with multiple src attributes
What does the async attribute do when used in a <container><script></container> tag?
A). Executes the script immediately
B). Delays script execution until HTML parsing is complete
C). Executes the script asynchronously
D). Executes the script before the HTML parsing begins
How do you comment out code in JavaScript?
A). // This is a comment
B). /* This is a comment */
C). <!-- This is a comment --!>
D). ## This is a comment
How can you prevent an external JavaScript file from being cached by the browser?
A). Add a query string to the src attribute
B). Use the async attribute
C). Use the defer attribute
D). It is not possible to prevent caching
What is the correct syntax for referring to an external script called 'app.js'?
A). <container><script src='app.js'></container>
B). <container><script href='app.js'></container>
C). <container><script link='app.js'></container>
D). <container><script file='app.js'></container>
Which file extension is used for JavaScript files?
A). .java
B). .js
C). .javascript
D). .jsx