Fundamentals of Front End Development MCQs with Answers
Practice important Fundamentals of Front End Development MCQs with answers and explanations.
Multiple Choice Questions
Q1621: What happens if you modify a file on the server but do not update the manifest file?
- A: The browser will show the updated file
- B: The browser will continue to show the cached version
- C: The file will be deleted from the cache
- D: The file will be re-downloaded
View Answer
B
Q1622: Which section would you use to list files that require an internet connection and should never be cached?
- A: CACHE MANIFEST
- B: NETWORK
- C: FALLBACK
- D: UPDATE
View Answer
B
Q1623: Fill in the blank: The fallback page specified in the FALLBACK section will be served in place of ______.
- A: cached files
- B: files listed in NETWORK
- C: files listed in CACHE MANIFEST
- D: all files
View Answer
B
Q1624: What is a Web Worker used for in HTML5?
- A: To create responsive web pages
- B: To run JavaScript in the background
- C: To handle DOM manipulations
- D: To store data locally
View Answer
B
Q1625: Which method is used to post a message back to the HTML page from a web worker?
- A: sendMessage()
- B: postMessage()
- C: receiveMessage()
- D: transferMessage()
View Answer
B
Q1626: What should you check before creating a Web Worker in JavaScript?
- A: Browser's version
- B: Support for Worker object
- C: Network connectivity
- D: File system access
View Answer
B
Q1627: What is the correct way to create a new Web Worker in JavaScript?
- A: var w = new Worker("worker.js");
- B: var w = new Worker("script.js");
- C: var w = new WebWorker("script.js");
- D: var w = Worker("worker.js");
View Answer
A
Q1628: Fill in the blank: To check for Web Worker support, you use if(typeof(Worker) !== "______").
- A: "undefined"
- B: "null"
- C: "object"
- D: "function"
View Answer
A
Q1629: What happens if you do not terminate a web worker after use?
- A: It will automatically terminate
- B: It will continue to listen for messages
- C: It will stop working after one message
- D: It will cause a memory leak
View Answer
B
Q1630: Fill in the blank: To terminate a web worker and free resources, use the ______ method.
- A: terminate()
- B: stop()
- C: close()
- D: end()
View Answer
A