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Ajax MCQ Questions Answers

Quizack gives you a chance to learn advanced knowledge by preparing Ajax MCQs. subject matter experts have chosen topics from best reference books and ongoing testing techniques. Ajax multiple choice questions will boost your knowledge up to the required level. Moreover, you are going to get interactive online testing tools to know your strengths and weaknesses instantly.

Sample Ajax MCQ

Which protocol is used to transfer data in an AJAX request?

Asynchronous Binary Transfer Protocol, ABTP

Hypertext Transfer Protocol, HTTP

AJAX Object Protocol, AOP

Advanced Server Protocol, ASP

Answer:
Hypertext Transfer Protocol, HTTP

Ajax multiple choice questions List

1. Which protocol is used to transfer data in an AJAX request?

2. Which of the HTTP actions is an Ajax XML HTTP request capable of sending to a server?

3. What is the JavaScript syntax for generating an XML HTTP request object and assigning it to the "xhr" variable? Consider only modern browsers, plus IE7 and above.

4. Is it possible to add custom HTTP header to ajax request?

5. What is the difference between the XMLHttpRequest object's .status and .statusText attributes?

6. What is the purpose of Ajax long-polling?

7. For the "same origin policy" to always allow an Ajax request, what attributes must be the same between the requesting context and the server?

8. What is the preferred method for maintaining back/forward button and crawler functionality in Ajax-driven web applications?

9. Which HTML5 feature can improve the experience of a user using the "back" and "forward" buttons when using AJAX techniques?

10. What does the acronym "blob" stand for when referring to data types?

11. In standard JavaScript, what makes asynchronous execution of Ajax calls possible?

12. Which browser features and/or technologies must be enabled, at a minimum, for AJAX techniques to function properly?

13. What are the advantages of using JavaScript libraries (like jQuery) to implement Ajax?

14. The primary benefit of using AJAX techniques in a web application is:

15. Which method on the XMLHttpRequest object is used to send custom HTTP headers with a request?

16. What is the value of the "status" attribute of the completed XMLHttpRequest object if the Ajax request has pulled the response data from the browser cache? Consider only non-IE browsers.

17. The onreadystatechange change event is used to invoke behavior when

18. If an Ajax request loads JSON-formatted responseText into the variable returnedData, what code will turn the data into a readable JSON object in modern browsers, including IE8 and above?

19. True or false? A GET request submitted through Ajax can never cause the server to delete data.

20. Ajax can be used to open a connection from the server to the browser without the browser making an explicit request.

21. How do you manually abort an Ajax request after a certain amount of time?

22. Most JavaScript libraries that provide AJAX support include this header in AJAX requests by default.

23. Can an XMLHttpRequest object be used to receive binary data?

24. What does JSON do?

25. True or false? Ajax can be used to open a connection from the server to the browser without the browser making an explicit request.

26. Can you make an XMLHttpRequest asynchronous call to a page on a different top level domain from the current page's top level domain?

27. Can you perform file uploads using AJAX requests alone?

28. AJAX applications are browser- and platform-dependent!

29. How will the response be parsed if responseType is set to "document" and the request has been made asynchronously?

30. What is the value of the .status attribute of the completed XMLHttpRequest object if the Ajax request needed to follow a server-side redirect before successfully finding the intended resource?

31. If the server is expecting JSON-formatted information in the request, what code will turn the JavaScript object dataToSend into data you can send to the server (consider modern browsers only, including IE8 and above)?

32. What's wrong with the following code? function check_for_request_done() { if (xhr.readyState == 4) { clearInterval(timer); do_something_with_result(xhr); } } var xhr = new XMLHttpRequest(); xhr.open("GET", "/resource", true); xhr.send(); var timer = setInterval(check_for_request_done, 100);

33. What is the name of the object which provides CORS support in Internet Explorer 8 and Internet Explorer 9?

34. What does CORS stand for?

35. What is the CORS-enabled Ajax request object constructor in IE8-9?

36. What is XSS?

37. How can you load JavaScript from a different file into your web application?

38. What is the syntax for the event listener that monitors whether the XMLHttpRequest object's readyState attribute has changed?

39. How does Google recommend you make an Ajax-dependent page accessible to their web crawler?

40. When your Ajax request is complete, what attribute of the XML HTTP request object contains the returned data?

41. What is the proper way to execute a callback function while making a "synchronous" request?

42. How would you configure a *synchronous* GET request to "/resource" after instantiating a new XMLHttpRequest object: var xhr = new XMLHttpRequest();?

43. Which readystate value indicates the response has been fully received from the asynchronous request?

44. What is the technical limitation to implementing user login entirely on the client side using Ajax?

45. According to the W3C specification, which HTTP methods should throw a security exception when used with XMLHttpRequest?

46. Your cross-origin Ajax request is causing your console to throw the error "Resource interpreted as Script but transferred with MIME type application/json. Uncaught SyntaxError: Unexpected token :" What might be happening?

47. After a request completes, which property of the XMLHttpRequest object can be used to retrieve a DOM representation of a remote XML document?

48. Which of these is NOT an advantage of using Ajax over server-side processing?

49. What happens if an Ajax call completes (and calls its callback function) when other JavaScript is currently running?

50. What arguments MUST be supplied to an XMLHttpRequest object's .open() method, and in what order?

51. Ajax is frequently expanded as "asynchronous JavaScript and XML," which is misleading. Which of these words is not central to Ajax's functionality?

52. You're issuing a request to "/resource" using XMLHttpRequest (xhr) where the server returns a 301 or 302 status code, what happens?

53. What HTTP response header is expected in reply to a CORS request?

54. What value of the XMLHttpRequest object's readystate attribute indicates that the response data (i.e. not the headers) is currently being sent back from the server?

55. You've created an XMLHttpRequest object, xhr, and properly called open as well as send on the object. When you check xhr.status and it's 0 and your responseText is null. What's the most likely explanation of what happened?

56. How do you detect errors in Ajax REQUESTS?

57. What XMLHttpRequest method is used to override MIME type returned by the server?

58. How does JSONP work?

59. What HTML attribute would you use to indicate to a screenreader that an element of the page may update (for example, by using Ajax) while out of the user's focus?

60. When receiving an image from the server, the responseType attribute of your XMLHttpRequest object must be set to:

61. Which property of the popstate event contains a copy of the history entry's state object?

62. Sending asynchronous requests is a huge improvement for web developers. Many of the tasks performed on the server are very time consuming. Before AJAX, this operation could cause the application to hang or stop. so, what is the best way to be done by web developers when sending asynchronous requests?

63. What is the value of the response property of XMLHttpRequest object if readyState property equal to 3?

64. In non-IE browsers, what attribute should you check your XMLHttpRequest object for in order to see if it supports CORS?

65. How many types of triggers are present in update panel?

66. What is the 1st method that is fired during the page load?

67. The acronym AJAX stands for _____________________

68. Which of the following is not passed in the request-line?

69. What is the standardized name of JavaScript?

70. Can AJAX be used with HTTPS (SSL)?

71. Can you start multiple threads with JavaScript?

72. Which describe the term 'Asynchronous' correctly?

73. Javascript uses static bindings.

74. In the following list, which ones are used to fetch the result data of an XMLHttpRequest?

75. Which navigator properties is the same in both Netscape and IE?

76. Can AJAX be used with PHP?

77. How can you create an XMLHttpRequest under Internet Explorer 6?

78. which list is/are true regarding AJAX?

79. What is NOSCRIPT tag for?

80. Can an HTML form be sent with AJAX?

81. You want to update the following element with the XMLHttpRequest status. Which of the following approaches is correct for the purpose?

82. Is it possible to make a page 'reload-safe' when using AJAX?

83. The X in AJAX refers to XML, but is it possible to make a request for plain text data by using AJAX?

84. Can WebDav methods like PROPFIND be used with XMLHttpRequest.open()?

85. What is true regarding XMLHttpRequest.abort()?

86. Which HTTP server does AJAX require?

87. Which request types should be used with AJAX?

88. When a user views a page with JavaScript in it, which machine executes the script?

89. Which is/are not addressed by AJAX?

90. Which is not a valid variable name in JavaScript?

91. Which cannot be resolved by using AJAX?

92. Which attribute of the SCRIPT tag can be used to hold the JavaScript version?

93. Can you call responseBody or responseText to get a partial result when the readyState of an XMLHttpRequest is 3(receiving)?

94. function foo () { return 5; } What will the following code do? var myVar = foo;

95. When doing an AJAX request, will the page be scrolled back to top as with normal requests?

96. Correct way to execute the function 'calc()' when an XMLHttpRequest is loaded?

97. Which is/are true regarding AJAX?

98. Can AJAX be used with offline pages?

99. Which is a block comment in JavaScript?

100. It might be needed to set the request content-type to XML explicitly. How can you do so for an XMLHttpRequest Object?

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