Java Script Onine Exam1 Practice tests

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1. When a JavaScript object is sent to Java, the runtime engine creates a Java wrapper of type ___________.
ScriptObject	JSObject
JavaObject	Jobject

2. _______ class provides an interface for invoking JavaScript methods and examining JavaScript properties.
ScriptObject	JSObject
JavaObject	Jobject

3. _________ is a wrapped Java array, accessed from within JavaScript code.
JavaArray	JavaClass
JavaObject	JavaPackage

4. A ________ object is a reference to one of the classes in a Java package, such as netscape.javascript .
JavaArray	JavaClass
JavaObject	JavaPackage

5. The JavaScript exception is available to the Java code as an instance of __________.
netscape.javascript.JSObject	netscape.javascript.JSException
netscape.plugin.JSException	None of the above

6. To automatically open the console when a JavaScript error occurs which of the following is added to prefs.js?
user_pref(" javascript.console.open_on_error", false);	user_pref ("javascript.console.open_error ", true);
user_pref ("javascript.console.open_error ", false);	user_pref ("javascript.console.open_on_error", true);

7. To open a dialog box each time an error occurs, which of the following is added to prefs.js?
user_pref ("javascript.classic.error_alerts", true);	user_pref ("javascript.classic.error_alerts ", false);
user_pref ("javascript.console.open_on_error ", true);	user_pref("javascript.console.open_on_error ", false);

8. The syntax of a blur method in a button object is _______.
Blur()	Blur (contrast)
Blur(value)	Blur(depth)

9. The syntax of capture events method for document object is __________.
captureEvents()	captureEvents(args eventType)
captureEvents(eventType)	captureEvents(eventVal)

10. The syntax of close method for document object is _________.
Close(doc)	Close(object)
Close(val)	Close()

11. <script type="text/javascript"> x=4+"4"; document.write(x); Output------?
44	8
4	Error output

12. Is it possible to nest functions in JavaScript?
True	False
All of the above	None

13. <script> document.write(navigator.appCodeName);
get code name of the browser of a visitor	set code name of the browser of a visitor
All of the above	None

14. Scripting language are _______.
High Level Programming language	Assembly Level programming language
Machine level programming language	None

15. Which best explains getSelection()?
Returns the VALUE of a selected OPTION	Returns document.URL of the window in focus
Returns the value of cursor-selected text	Returns the VALUE of a checked radio input

16. Choose the client-side JavaScript object:
Database	Cursor
Client	FileUpLoad

17. What is mean by "this" keyword in javascript?
It refers current object	It referes previous object
It is variable which contains value	None of the above

18. In JavaScript, Window.prompt() method return true or false value ?
False	True
All of the above	None

19. <script language="javascript"> function x() { document.write(2+5+"8"); }
258	Error
7	78

20. <script type="text/javascript"> var s = "9123456 or 80000?"; var pattern = /\d{4}/; var output = s.match(pattern); document.write(output);
9123	91234
80000	None of the above