UpWork (oDesk) & Elance AJAX Test Question & Answers

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Ques : Which of the following is/are true regarding AJAX?
Ans  : It's an engine developed by Microsoft to load web pages faster +  It's merely a concept with many implementation methods (XMLHttpRequest, iFrames...) + It's a good way to reduce network traffic, if used correctly

Ques : Which of the following browsers provide XMLHttpRequest property?
Ans  :Internet Explorer 7 + Firefox 2.0 + Safari 3.0

Ques : What is true regarding XMLHttpRequest.abort()?
Ans  : It can only be used with async requests + It will remove the onreadystatechange event handler

Ques : document.write ("Hello");  will pop a dialog box with "Hello" in it.
Ans  :  false

Ques : Is it possible to make a page "reload-safe" when using AJAX?
Ans  :  yes, if each AJAX request modifies the server side context, which would render a page similar to the actual JS modified page, if reloaded.

Ques : In the following list, which ones are used to fetch the result data of an XMLHttpRequest?
Ans  : responseXML

Ques : Is it always possible to make requests to multiple websites with different domain names from an AJAX client script?
Ans  :yes

Ques : Is the loading of an AJAX enabled web page any different from the loading of a normal page?
Ans  :  Yes

Ques : Can AJAX be used with HTTPS (SSL)?
Ans  : yes

Ques : Which of the following list is/are true regarding AJAX?
Ans  : It can be used to update parts of a webpage without reloading it

Ques : Can WebDav methods like PROPFIND be used with XMLHttpRequest.open()?
Ans  : Yes

Ques : Can AJAX be used with offline pages?
Ans  :  yes

Ques : Can a client AJAX application be used to fetch and execute some JavaScript code?
Ans  : no

Ques :  What language does AJAX use on the client side?
Ans  :  JavaScript

Ques : Can AJAX be used with PHP?
Ans  : yes

Ques : What is the correct way to execute the function "calc()" when an XMLHttpRequest is loaded?
Ans  : myRequest.onreadystatechange = calc;

Ques : Can an HTML form be sent with AJAX?
Ans  : yes

Ques : Can you call responseBody or responseText to get a partial result when the readyState of an XMLHttpRequest is 3(receiving)?
Ans  : No

Ques : Can an AJAX application communicate with other applications on the client computer?
Ans  : No

Ques : Which of the following describes the term 'Asynchronous' correctly?
Ans  : Ability to handle processes independently from other processes

Ques : What is the common way to make a request with XMLHttpRequest?
Ans  : myReq.send(null);

Ques : What is the correct way to have the function checkState called after 10 seconds?
Ans  :  window.setTimeout(checkState, 10000);

Ques : How can you create an XMLHttpRequest under Internet Explorer 6?
Ans  : var oReq = new ActiveXObject ("MSXML2.XMLHTTP.3.0");

Ques : The X in AJAX refers to XML, but is it possible to make a request for plain text data by using AJAX?
Ans  : yes

Ques : Is it possible to create and manipulate an image on the client with AJAX?
Ans  : yes

Ques : Is it possible to make some system calls on the client with AJAX?
Ans  : No

Ques : What is the third (async) parameter of the XMLHttpRequest open method?
Ans  :  If true, callbacks are executed

Ques : Which HTTP server does AJAX require?
Ans  : Any HTTP server will work

Ques : Which of the following is a block comment in JavaScript?
Ans  :  /* */

Ques : It might be needed to set the request content-type to XML explicitly. How can you do so for an XMLHttpRequest Object?
Ans  : myReq.setRequestHeader ("Content-Type", "text/xml");

Ques : Does JavaScript 1.5 have exception handling?
Ans  : yes

Ques : Which of the following cannot be resolved by using AJAX?
Ans  : Server crashes (failover)

Ques : Which of the following request types should be used with AJAX?
Ans  : HTTP GET request for retrieving data (which will not change for that URL)

Ques : When may asynchronous requests be used?
Ans  :  All of the above

Ques : Is it possible to access the browser cookies from a javascript application?
Ans  :    yes

Ques : Which of the following is not a JavaScript operator?
Ans  :  All of the above are Javascript operators

Ques : The server returns data to the client during an AJAX postback. Which of the following is correct about the returned data?
Ans  :  It only contains the data of the page elements that need to be changed

Ques : When doing an AJAX request, will the page be scrolled back to top as with normal requests?
Ans  : No

Ques : Javascript uses static bindings.
Ans  :  false

Ques : Which of the following is not a valid variable name in JavaScript?
Ans  :  2myVar

Ques : Is JavaScript the same as Java?
Ans  : no

Ques : What is NOSCRIPT tag for?
Ans  : To enclose text to be displayed if the browser doesn't support JS

Ques : In the following list, which states are valid?

XMLHttpRequest.readyState
Ans  : All of the above.

Ques : What is the standardized name of JavaScript?
Ans  : ECMAScript

Ques : which language does AJAX use on the server side?
Ans  : Any language supported by the server

Ques : Which of the following is/are not addressed by AJAX?
Ans  :  Offline browsing

Ques : Which of the following are drawbacks of AJAX?
Ans  : The browser back button cannot be used in most cases

Ques : What is the correct syntax to create an array in JavaScript?
Ans  : var array = new Array ();

Ques : Consider the following
function:


function foo ()
{
return 5;
}

What will the following code do?

var myVar = foo;
Ans  :  Assign the pointer to function foo to myVar

Ques : What should be called before 'send ()' to prepare an XMLHttpRequest object?
Ans  : open ()

Ques : Can you start multiple threads with JavaScript?
Ans  : No

Ques : Can AJAX be used to move files on the client-side?
Ans  :  No

Ques : Which of the following status codes denotes a server error?
Ans  :  500

Ques : When a user views a page with JavaScript in it, which machine executes the script?
Ans  :  The client machine running the Web Browser

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