Fundamentals of Front End Development MCQs with Answers
Practice important Fundamentals of Front End Development MCQs with answers and explanations.
Multiple Choice Questions
Q1641: How can you append received data to an element in the HTML document using SSE?
- A: res.innerHTML += event.data + "
- B: res.innerHTML = event.data;
- C: res.appendChild(event.data);
- D: res.textContent += event.data;
View Answer
A
Q1642: Fill in the blank: The server-side event stream syntax requires starting with the header "Content-Type: ______".
- A: text/event-stream
- B: application/json
- C: text/html
- D: application/x-www-form-urlencoded
View Answer
A
Q1643: What is a key feature of Server-Sent Events compared to older methods of receiving server updates?
- A: The updates are sent automatically
- B: The updates require a user prompt
- C: The updates are sent less frequently
- D: The updates are encrypted
View Answer
A
Q1644: Which JavaScript event is triggered when a message is received from the EventSource?
- A: onmessage
- B: onload
- C: onerror
- D: onchange
View Answer
A
Q1645: Fill in the blank: Server-Sent Events only work if the browser supports the ______ object.
- A: EventSource
- B: XMLHttpRequest
- C: Fetch
- D: WebSocket
View Answer
A
Q1646: What header should be set to enable Server-Sent Events in PHP?
- A: Content-Type: application/json
- B: Content-Type: text/html
- C: Content-Type: text/event-stream
- D: Content-Type: application/xml
View Answer
C
Q1647: Fill in the blank: In the PHP code, the header('Cache-Control: ______') ensures that the page is not cached.
- A: no-cache
- B: private
- C: public
- D: max-age=0
View Answer
A
Q1648: What is the correct format for sending data in a Server-Sent Event?
- A: data: Your data here
- B: content: Your data here
- C: message: Your data here
- D: info: Your data here
View Answer
A
Q1649: Which event occurs when a connection to the server is successfully opened using EventSource?
- A: onopen
- B: onmessage
- C: onerror
- D: onload
View Answer
A
Q1650: What is the default behavior for caching in Server-Sent Events?
- A: Caching is enabled
- B: Caching is disabled
- C: Caching is optional
- D: Caching is automatic
View Answer
B