Jquery MCQs | Jquery Objective Type Questions and Answers

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Questions
21 What is the correct jQuery code to set the background color of all p elements to red?
A $("p").css("background-color","red");
B $("p").style("background-color","red");
C $("p").layout("background-color","red");
D $("p").manipulate("background-color","red");

Answer: $("p").css("background-color","red");
22 Which jQuery method is used to hide selected elements?
A hide()
B visible(false)
C display(none)
D hidden()

Answer: hide()
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23 Which statement is true?
A To use jQuery, you can refer to a hosted jQuery library at Google
B To use jQuery, you must buy the jQuery library at www.jquery.com
C To use jQuery, you do not have to do anything. Most browsers (Internet Explorer, Chrome, Firefox and Opera) have the jQuery library built in the browser
D None of the above

Answer: To use jQuery, you must buy the jQuery library at www.jquery.com
24 Which jQuery method should be used to deal with name conflicts?
A conflict()
B noConflict()
C nameConflict()
D noNameConflict()

Answer: conflict()
25 Which jQuery method is used to switch between adding/removing one or more classes (for CSS) from selected elements?
A switchClass()
B switch()
C toggleClass()
D None of the above

Answer: switchClass()
26 Which statement best explains what "unobtrusive JavaScript" is?
A JavaScript that is separate from HTML
B JavaScript that doesn't annoy users
C JavaScript that works even with scripting turned off
D JavaScript that does not affect a web page

Answer: JavaScript that is separate from HTML
27 Which of these is NOT a valid comment in JavaScript?
A /* This is a comment
B /* This is a comment. */
C // This is a comment
D All of the above

Answer: // This is a comment
28 In JavaScript, we can keep a reference to the context outside a function by assigning it to a variable: var self = this. In CoffeeScript, we use:
A printScope => console.log this
B self = this printScope -> console.log self
C printScope => console.log @
D All of the above

Answer: All of the above
29 What is the correct JavaScript syntax to write "Hello World"?
A document.write("Hello World")
B response.write("Hello World")
C ("Hello World")
D None of the above

Answer: document.write("Hello World")
30 jQuery is a...
A Ruby Gem
B PHP Frameworks
C JavaScript library
D None of the above

Answer: JavaScript library
31 $.foo() is equivalent to..
A jQuery.foo()
B javascript.foo()
C document.foo()
D None of the above

Answer: jQuery.foo()
32 var ps = $("p"); ps will be..
A A jQuery object
B An array
C A linked list
D A hash or dictionary

Answer: A jQuery object
33 The CSS selector engine that jQuery uses is called?
A Sizzle
B Mango
C Badaboom
D AwesomeX

Answer: Sizzle
34 The jQuery library contains the following features
A JavaScript Effects and animations. HTML DOM traversal and modification. AJAX. Utilities
B HTML element selections. HTML element manipulation .HTML event functions
C CSS manipulation. JavaScript Effects and animations. HTML DOM traversal and modification
D all of the above

Answer: all of the above
35 AJAX and jQuery
A With jQuery AJAX, you can request TXT, HTML, XML or JSON data from a remote server using both HTTP Get and HTTP Post
B jQuery provides a rich set of methods (functions) for AJAX web development
C a and b
D AJAX and jQuery are cross-platform (you can develop in Windows and serve on a Unix platform)

Answer: a and b

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