21 - Jquery Interview Questions

1. What is jQuery?
Ans. JQuery is a Lightweight Javascript Library.

2. What is the alias for jQuery?
Ans. dollar sign ($) is used as an alias in jQuery.

3.Types of selectors in jQuery.
Ans. 1. Class selectors
         2. ID selectors
         3. Element selectors

4. What are the slow selectors in jQuery?
Ans. Class selectors are slow compared to ID and Element.

5. Who is the founder of jQuery?
Ans. John Resig

6. What is the difference between Javascript and Jquery?
Ans. Javascript is the language and Jquery is the library built in the Javascript language.

7. How to check the data type of any variable in Jquery?
Ans. Using $.type(Object)

8. How to Hide Elements in Jquery?
Ans. Using hide()
         For Example : $("#ID").hide();

9. Is Jquery a W3C standard?
Ans. No

10. Which sign does Jquery use as a shortcut for Jquery?
Ans. $ sign.

11. List down Jquery effects methods.
Ans. Show()
         Hide()
         Toggle()
         FadeIn()
         FadeOut()

12. Which Jquery command used to check the version of Jquery?
Ans, $.ui.version

13. What is JQuery.noConflict?
Ans. JQuery.noConflict is used to overcome the conflicts between different JQuery frameworks.

14. What is the use of the JQuery.each() function?
Ans. JQuery.each() function is used to loop through the collection or array.

15. What is the use of the .first() function?
Ans. .first() function returns first element of the selected element.

16. What is the use of the .last() function?
Ans. .last() function returns last element of the selected element.

17. What is the use of the next() method?
Ans. next() method returns the next sibling element of the selected element.

18. What is the use of the prev() method?
Ans. prev() method returns the previous sibling method of the selected element.

19. What is the use of the parent() function?
Ans. parent() function returns the parent element of the selected element.

20. What is the use of the children() function?
Ans. children() function returns the children elements of the selected element.

21. What is the use of the siblings() function?
Ans. siblings() function returns all the sibling elements of the selected element.