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Sunday, January 17, 2016

JavaScript & AJAX interview questions

1.  Why so JavaScript and Java have a similar name?
A.  JavaScript is a stripped-down version of Java
B.  JavaScript’s syntax is loosely based on Java’s
C.  They both originated on the island of Java
D.  None of the above
Ans: B

2.  When a user views a page containing a JavaScript program, which machine actually executes the script?
A.  The User’s machine running a Web browser
B.   The Web server
C.  A central machine deep within Netscape’s corporate offices
D.  None of the above
Ans: A

3.  ______ JavaScript is also called client-side JavaScript.
A.  Microsoft
B.  Navigator
C.  LiveWire
D.  Native
Ans: B

4.  __________ JavaScript is also called server-side JavaScript.
A.  Microsoft
B.   Navigator
C.  LiveWire
D.  Native
Ans: C

5.  What are the variables used for in JavaScript Programs?
A.  Storing numbers, dates, or other values
B.   Varying randomly
C.  Causing high-school algebra flashbacks
D.  None of the above
Ans: A

6.  _____ JavaScript statements embedded in an HTML page can respond to user events such as mouse-clicks, form input, and page navigation.
A.  Client-side
B.   Server-side
C.  Local
D.  Native
Ans: A

7.  What should appear at the very end of your JavaScript?
The <script>tag
A.   The </script>
B.    The <script>
C.  The END statement
D.  None of the above
Ans: A

8.  Which of the following can’t be done with client-side JavaScript?
A.  Validating a form
B.   Sending a form’s contents by email
C.  Storing the form’s contents to a database file on the server
D.  None of the above
Ans: C

9.  Which of the following are capabilities of functions in JavaScript?
A.  Return a value
B.   Accept parameters and Return a value
C.  Accept parameters
D.  None of the above
Ans: C

10.  Which of the following is not a valid JavaScript variable name?
A.  2names
B.   _first_and_last_names
C.  FirstAndLast
D.  None of the above
Ans: A

11.  ______ tag is an extension to HTML that can enclose any number of JavaScript statements.
A.  <SCRIPT>
B.   <BODY>
C.  <HEAD>
D.  <TITLE>
Ans: A

12.  How does JavaScript store dates in a date object?
A.  The number of milliseconds since January 1st, 1970
B.   The number of days since January 1st, 1900
C.  The number of seconds since Netscape’s public stock offering.
D.  None of the above
Ans: A

13.  Which of the following the attribute can hold the JavaScript version?
A.  LANGUAGE
B.   SCRIPT
C.  VERSION
D.  None of the above
Ans: A

14.  What is the correct JavaScript syntax to write “Hello World”?
A.  System.out.println(”Hello World”)
B.   println (”Hello World”)
C.  document.write(”Hello World”)
D.  response.write(”Hello World”)
Ans: C

15.  Which of the following way can be used to indicate the LANGUAGE attribute?
A.  <LANGUAGE=”JavaScriptVersion”>
B.   <SCRIPT LANGUAGE=”JavaScriptVersion”>
C.  <SCRIPT LANGUAGE=”JavaScriptVersion”>    JavaScript statements…</SCRIPT>
D.  <SCRIPT LANGUAGE=”JavaScriptVersion”!>    JavaScript statements…</SCRIPT>
Ans: C

16.  Inside which HTML element do we put the JavaScript?
A.  <js>
B.   <scripting>
C.  <script>
D.  <javascript>
Ans: C

17.  What is the correct syntax for referring to an external script called ” abc.js”?
A.  <script href=” abc.js”>
B.   <script>
C.  <script src=” abc.js”>
D.  None of the above
Ans: C

18.  Which types of image maps can be used with JavaScript?
A.  Server-side image maps
B.  Client-side image maps
C.  Server-side image maps and Client-side image maps
D.  None of the above
Ans: B

19.  Which of the following navigator object properties are the same in both   Netscape and IE?
A.  navigator.appCodeName
B.   navigator.appName
C.  navigator.appVersion
D.  None of the above
Ans: A

20.  Which is the correct way to write a JavaScript array?
A.  var txt = new Array(1:”tim”,2:”kim”,3:”jim”)
B.   var txt = new Array:1=(”tim”)2=(”kim”)3=(”jim”)
C.  var txt = new Array(”tim”,”kim”,”jim”)
D.  var txt = new Array=”tim”,”kim”,”jim”
Ans: C

21.  What does the <noscript> tag do?
A.  Enclose text to be displayed by non-JavaScript browsers.
B.   Prevents scripts on the page from executing.
C.  Describes certain low-budget movies.
D.  None of the above
Ans: A

22. If para1 is the DOM object for a paragraph, what is the correct syntax to change the text within the paragraph?
A.  “New Text”?
B.  para1.value=”New Text”;
C.  para1.firstChild.nodeValue= “New Text”;
D.  para1.nodeValue=”New Text”;
Ans: B

23.  JavaScript entities start with _______ and end with _________.
A.  Semicolon, colon
B.   Semicolon, Ampersand
C.  Ampersand, colon
D.  Ampersand, semicolon
Ans: D

24.  Which of the following best describes JavaScript?
A.  a low-level programming language.
B.   a scripting language precompiled in the browser.
C.  a compiled scripting language.
D.  an object-oriented scripting language.
Ans: D

25.  Choose the server-side JavaScript object?
A.  FileUpLoad
B.   Function
C.  File
D.  Date
Ans: D

26.  Choose the client-side JavaScript object?
A.  Database
B.   Cursor
C.  Client
D.  FileUpLoad
Ans: D

27.  Which of the following is not considered a JavaScript operator?
A.  new
B.  this
C.  delete
D.  typeof
Ans: B

28.  ______method evaluates a string of JavaScript code in the context of the specified object.
A.  Eval
B.   ParseInt
C.  ParseFloat
D.  Efloat
Ans: A

29.  Which of the following event fires when the form element loses the focus: <button>, <input>, <label>, <select>, <textarea>?
A.  onfocus
B.  onblur
C.  onclick
D.  ondblclick
Ans: B

30.  The syntax of Eval is ________________
A.  [objectName.]eval(numeric)
B.  [objectName.]eval(string)
C.  [EvalName.]eval(string)
D.  [EvalName.]eval(numeric)
Ans: B

31.  JavaScript is interpreted by _________
A.  Client
B.   Server
C.  Object
D.  None of the above
Ans: A

32.  Using _______ statement is how you test for a specific condition.
A.  Select
B.  If
C.  Switch
D.  For
Ans: B

33.  Which of the following is the structure of an if statement?
A.  if (conditional expression is true) thenexecute this codeend if
B.   if (the conditional expression is true)execute this code end if
C.  if (conditional expression is true)   {then execute this code>->}
D.  if (conditional expression is true) then {execute this code}
Ans: B

34.  How to create a Date an object in JavaScript?
A.  dateObjectName = new Date([parameters])
B.   dateObjectName.new Date([parameters])
C.  dateObjectName := new Date([parameters])
D.  dateObjectName Date([parameters])
Ans: B

35.  The _______ method of an Array object adds and/or removes elements from an array.
A.  Reverse
B.   Shift
C.  Slice
D.  Splice
Ans: D

36.  To set up the window to capture all Click events, we use which of the following statement?
A.  window.captureEvents(Event.CLICK);
B.   window.handleEvents (Event.CLICK);
C.  window.routeEvents(Event.CLICK );
D.  window.raiseEvents(Event.CLICK );
Ans: A

37.  Which tag(s) can handle mouse events in Netscape?
A.  <IMG>
B.  <A>
C.  <BR>
D.  None of the above
Ans: B

38.  ____________ is the tainted property of a window object.
A.  Pathname
B.   Protocol
C.  Defaultstatus
D.  Host
Ans: C

39.  To enable data tainting, the end user sets the _________ environment variable.
A.  ENABLE_TAINT
B.   MS_ENABLE_TAINT
C.  NS_ENABLE_TAINT
D.  ENABLE_TAINT_NS
Ans: C

40.  In JavaScript, _________ is an object of the target language data type that encloses an object of the source language.
A.  a wrapper
B.   a link
C.  a cursor
D.  a form
Ans: A

41.  When a JavaScript object is sent to Java, the runtime engine creates a Java wrapper of type ___________
A.  ScriptObject
B.  JSObject
C.  JavaObject
D.  Jobject
Ans: B

42.  _______ class provides an interface for invoking JavaScript methods and examining JavaScript properties.
A.  ScriptObject
B.  JSObject
C.  JavaObject
D.  Jobject
Ans: B

43.  _________ is a wrapped Java array, accessed from within JavaScript code.
A.  JavaArray
B.   JavaClass
C.  JavaObject
D.  JavaPackage
Ans: A

44. A ________ object is a reference to one of the classes in a Java package, such as netscape.javascript .
A.  JavaArray
B.  JavaClass
C.  JavaObject
D.  JavaPackage
Ans: B

45.  The JavaScript exception is available to the Java code as an instance of __________
A.  netscape.javascript.JSObject
B.  netscape.javascript.JSException
C.  netscape.plugin.JSException
D.  None of the above
Ans: B

46. To automatically open the console when a JavaScript error occurs which of the following is added to prefs.js?
A.  user_pref(” javascript.console.open_on_error”, false);
B.   user_pref(”javascript.console.open_error “, true);
C.  user_pref(”javascript.console.open_error “, false);
D.   user_pref(”javascript.console.open_on_error”, true);
Ans:D 

47.  To open a dialog box each time an error occurs, which of the following is added to prefs.js?
A.  user_pref(”javascript.classic.error_alerts”, true);
B.   user_pref(”javascript.classic.error_alerts “, false);
C.  user_pref(”javascript.console.open_on_error “, true);
D.  user_pref(”javascript.console.open_on_error “, false);
Ans: A

48.  The syntax of a blur method in a button object is ______________
A.  Blur()
B.   Blur(contrast)
C.  Blur(value)
D.  Blur(depth)
Ans: A

49.  The syntax of capture events method for document object is ______________
A.  captureEvents()
B.   captureEvents(args eventType)
C.  captureEvents(eventType)
D.  captureEvents(eventVal)
Ans: C

50.  The syntax of close method for document object is ______________
A.  Close(doc)
B.   Close(object)
C.  Close(val)
D.  Close()
Ans: D

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