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|What is jQuery?|
|Why jQuery and features of jQuery?|
jQuery philosophy is “Write less, do more”
Open source and has large community of users and contributors
Tested and optimized for modern browsers
Lightweight, robust and expandable
Offers plug-ins and ready-made functionality
Can be used for event-driven programming
|How we can use jQuery on a web page?|
We can use jQuery in web page by two way
Use of content delivery network (CDN) to include a version of jQuery.
|What is a CDN? Why a CDN is Useful to jQuery and advantage of it?|
Content delivery network is geographically distributed worldwide high-speed collection of servers, which can serve content to end-users in lowround-trip times.
We can start using jQuery from CDN simply by adding a <script> tag in web page without locally downloaded.
Browsers reused cached jQuery files for web sites that are located in different domains, which significantly improve performance.
CDN offers reliable high-speed access on jQuery library withminimum round-trip time.
|Which are the popular jQuery CDN? How to load jQuery from CDN?|
Google, Microsoft and jQuery are popular jQuery CDN.
To load a hosted library from CDN, copy and paste the below HTML snippet for that library (shown below) in your web page
|How to load jQuery locally when CDN unavailable?|
To allow to loading jQuery from a local path on your own website if the CDN happens to be unavailable, add the following element immediately after the element referencing the CDN:
<script src=" /jquery/jquery-1.9.0.min.js"></script>
<script src=" /jquery/jquery-1.9.0.min.js"></script>
|What is the difference between jQuery and its alias $?|
jQuery and $ are the same thing and work same. $ is just a shortcut.
For example, the following statement will create an <a>element wrapped inside of a <p>element with a text node encapsulated inside of the <p>and <a>elements:
|Can we replace any character or variable instead of $ in jQuery?|
We can replace $ by using no Conflict () method, see below snippet to replace $ to jqwrite
var jqwrite = $.noConflict()
|Explained jQuery document.ready() function?|
Everything inside the $(document).ready() function will load as soon as the DOM (Document Object Model) is loaded and before the page contents are loaded.
jQuery Document Ready Snippet
Different ways to write jQuery Document Ready Snippet
jQuery document ready function can be used as many times in page as you like.
|What are selectors in jQuery and how many types of selectors are there?|
jQuery selectors are used to select html elements to in order to operate on the element based on their id, class, element type, attributes, and many more. There are many types of selectors but important selectors are:
Element Selector (“element”):Selects all elements with the given tag name
All Selector (“*”): select all HTML elements at a time.
Id Selector (“#id”): Selects a single element with the given id attribute.
Class Selector (“.class”): Selects all elements with the given class.
Attribute Selector [name=”value”]: Select elements based on its attribute value.
Multiple Selector (“selector1, selector2, selectorN”): Select elements that match all selector condition.
|Height and Distance|
An aeroplane flying at a height of 300 m above the ground passes vertically above another plane at an instant when the angles of elevation of the two planes from the same point on the ground are 60º and 45º respectively. What is the height of the lower plane from the ground?
From the top of a building 90 m high, the angles of depression of the top and the bottom of a tree are 30º and 45º respectively. What is the height of the tree?
What is the value of sinx √( 1 /1+cosx + 1 /1-cosx ) ?
What is cos4 A - sin4 A / cos2 A - sin2 A equal to?
If 7sin2 x +3cos2 x = 4, 0 < x < 90º ,then what is the value of tan x?
If x = a cosθ + b sinθ and y = a sinθ - b cosθ then what is x2 + y2 equal to?
The mean of 5 numbers is 15. If one more number is included, the mean of the 6 numbers becomes 17. What is the included number?
The mean marks obtained by 300 students in a subject are 60. The mean of top 100 students was found to be 80 and the mean of last 100 students was found to be 50. The mean marks of the remaining 100 students are?
In an asymmetrical distribution, of the mean and median of the distribution are 270 and 220 respectively, then the mode of the data is?
Let a, b, c, d, e, f, g be consecutive even numbers and j, k, l, m, n be consecutive odd numbers. What is the average of all the numbers?
|Alligation or Mixture|
25 kg of alloy X is mixed with 125 kg of alloy Y. If the amount of lead and tin in the alloy X is the ratio 1 : 2 and the amount of lead and tin in the alloy Y is in the ratio 2 : 3, then what is the ratio of lead to tin in the mixture?
The ratio of two numbers is 1 : 5 and their product is 320. What is the difference between the square of these two numbers?
What is the value of cot 4π/3 ?
Article-24 of the Indian Constitution ‘Prohibition of employment of children in factories, etc’ deals with?
Article-134A of the Indian Constitution ‘Certificate for appeal to the Supreme Court’ deals with?
Who invented Aspirin?
A larger force on a rotating body results in larger?
What is the unit of the physical quantity, magnetic flux density?
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