Rigorous Ajax Test - 44+ MCQs: Ajax Quiz: Test Your Expertise with Asynchronous JavaScript and XML

1. What is the purpose of the 'onload' event in Ajax?

To handle errors during the request

To execute code when the request completes successfully

To set up the initial configuration of XMLHttpRequest

To track the progress of the data transfer

2. Which JavaScript function is commonly used to parse JSON data received in an Ajax response?

parseXML()

decodeJSON()

evalJSON()

JSON.parse()

3. What is the purpose of the 'responseType' property in the XMLHttpRequest object?

To set custom headers in the request

To define the response type

To monitor the change in the ready state of the request

To handle errors during the request

4. In Ajax, what is the purpose of the 'async' attribute in the 'script' tag?

To define the response type

To ensure the script is executed asynchronously

To set custom headers in the request

To handle errors during the request

5. What is the purpose of the 'onerror' event in Ajax?

To define the response type

To execute code when the request completes successfully

To handle errors during the request

To monitor the change in the ready state of the request

6. What is the purpose of the XMLHttpRequest readyState property?

To specify the HTTP method for the request

To determine the current state of the request

To define the response type

To set request headers

7. Which object is commonly used to perform asynchronous requests in Ajax?

XMLHttpRequest

AjaxRequest

AsynchronousRequest

HTTPAsyncObject

8. What does the term 'preflight request' mean in the context of Ajax?

A request sent before the main request to check server capabilities

A request to validate the status of the server

A request with pre-defined headers

A request sent to multiple servers in parallel

9. What is the role of the Ajax callback function?

To define the HTML structure of the page

To handle the server response after an asynchronous request

To initiate an Ajax request

To set up the initial configuration of XMLHttpRequest

10. Which method is used to send an asynchronous request to the server in Ajax?

sendRequest()

postAsync()

transmit()

open() and send()

11. What is the purpose of the same-origin policy in Ajax?

To restrict requests to a different domain for security reasons

To enable cross-origin resource sharing

To validate the content type of Ajax responses

To prevent caching of Ajax requests

12. Which method is used to perform parallel Ajax requests?

executeParallel()

sendAsync()

performRequest()

Promise.all()

13. What is the role of the 'onabort' event in Ajax?

To handle errors during the request

To initiate an Ajax request

To monitor the change in the ready state of the request

To execute code when the request is aborted

14. What is the purpose of the 'async' attribute in the XMLHttpRequest open method?

To specify the request method

To set the request headers

To indicate whether the request should be asynchronous or not

To define the response type

15. What is the main advantage of using Ajax in web development?

Improved server performance

Reduced client-side scripting

Synchronous data transfer

Dynamic and responsive user interfaces

16. What is the purpose of the XMLHttpRequest property 'onprogress' in Ajax?

To handle errors during the request

To monitor the change in the ready state of the request

To track the progress of the data transfer

To define the response type

17. Which property is used to access the status code of an Ajax response?

statusCode

responseStatus

status

HTTPStatus

18. What security measure is used to prevent Cross-Site Request Forgery (CSRF) in Ajax?

The 'same-origin policy'

The 'async' attribute in the 'script' tag

The 'CORS' policy

The 'X-Requested-With' header

19. Which attribute is used to set the content type of an Ajax request?

contentType

type

dataType

requestType

20. Which event is triggered when an Ajax request completes successfully?

onError

onAbort

onReadyStateChange

onSuccess

21. In Ajax, what does the term 'serialization' refer to?

The process of converting data into a string for transmission

The simultaneous execution of multiple functions

The handling of server responses

The validation of Ajax requests

22. In Ajax, what is the purpose of the 'FormData' object?

To track the progress of the data transfer

To handle errors during the request

To initiate an Ajax request

To facilitate the sending of form data in the request

23. What is the purpose of the 'Preflight request' in Ajax?

To execute code when the request is aborted

A preliminary request sent to check server capabilities before the main request

To track the progress of the data transfer

To initiate an Ajax request

24. Which method is used to set custom headers in an Ajax request?

setHeaders()

addHeaders()

customHeaders()

setRequestHeader()

25. In Ajax, what does the term 'cross-origin' refer to?

Multiple server requests in parallel

Requests sent using different HTTP methods

Accessing resources from a different domain

Simultaneous execution of multiple Ajax functions

26. What is the purpose of the 'crossOrigin' property in the 'Image' object in Ajax?

To handle errors during the request

To define the response type

To facilitate cross-origin requests for images

To track the progress of the data transfer

27. Which status code indicates a successful Ajax request?

200 OK

404 Not Found

500 Internal Server Error

302 Found

28. What does Ajax stand for?

Asynchronous JavaScript and XML

Advanced JavaScript and XML

Ajax is not an acronym

Automated JavaScript and XML

29. Which JavaScript function is commonly used to handle errors in Ajax?

errorHandler()

handleError()

onError()

catchError()

30. How does the 'CORS' policy impact Ajax requests?

It ensures the request is executed synchronously

It restricts requests to the same origin for security reasons

It allows cross-origin requests without any restrictions

It defines custom headers for cross-origin requests

Ajax MCQ Test 2