JavaScript MCQs – Ajax

AJAX (Asynchronous JavaScript and XML) is a technique used in web development to create dynamic and interactive web applications. It allows data to be exchanged with a server without refreshing the entire page. AJAX is commonly used for operations like fetching data, submitting forms, or updating parts of a web page in real-time. Understanding AJAX is essential for developers, as many interview questions focus on its concepts, methods, and usage in JavaScript.

1.) What does AJAX stand for?

A) Asynchronous JavaScript and XML
B) Advanced JavaScript and XHTML
C) Asynchronous JSON and XML
D) Asynchronous Java and XML

Answer: Option A

Explanation: AJAX stands for Asynchronous JavaScript and XML, enabling dynamic updates without reloading the page.

2.) Which method in JavaScript is used to create an AJAX request?

A) fetch()
B) XMLHttpRequest()
C) requestAPI()
D) getRequest()

Answer: Option B

Explanation: The XMLHttpRequest() object is traditionally used to send and receive AJAX requests.

3.) The XMLHttpRequest() object is traditionally used to send and receive AJAX requests.

A) Fetch API
B) WebSockets
C) DOMParser
D) Event API

Answer: Option A

Explanation: The Fetch API provides a simpler, modern alternative for making HTTP requests.

4.) What is the default HTTP method used by AJAX?

A) POST
B) GET
C) PUT
D) DELETE

Answer: Option B

Explanation: By default, AJAX uses the GET method to retrieve data from the server.

5.) How do you check the status of an AJAX request?

A) statusCode
B) responseCode
C) status
D) readyState

Answer: Option C

Explanation: The status property of an XMLHttpRequest object indicates the HTTP response status code.

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

A) Indicates the server’s response time
B) Tracks the progress of the request
C) Specifies the HTTP method
D) Logs the request errors

Answer: Option B

Explanation: The readyState property represents the state of the request, from initialization to completion.

7.) Which readyState value indicates that the request is complete?

A) 1
B) 2
C) 3
D) 4

Answer: Option D

Explanation: A readyState of 4 indicates that the operation is complete, and the response is ready.

8.) What is the purpose of the onreadystatechange event?

A) To log errors in the request
B) To handle state changes in the XMLHttpRequest
C) To initialize the AJAX request
D) To set request headers

Answer: Option B

Explanation: The onreadystatechange event is triggered whenever the state of the XMLHttpRequest changes.

9.) Which method sends the AJAX request?

A) execute()
B) trigger()
C) send()
D) process()

Answer: Option C

Explanation: The send() method is used to send an HTTP request to the server.

10.) Which response type is used to receive data as JSON?

A) text
B) json
C) xml
D) blob

Answer: Option B

Explanation: The json response type parses the server’s response as JSON data.

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