Anupa,
I feel I should warn you that some of the Web pages, in the Google search results that David posted, are quite old -- and therefore may be misleading.
I suggest you try to ascertain the age of the information in any Web page about EJB interview questions, and try to stick with recent ones only.
I believe most people are adhering to the 2.0 and 2.1 versions of the EJB specification, so I suggest concentrating on interview questions that relate to those. For your information, the specifications are available from here:
http://java.sun.com/products/ejb/docs.html Good Luck,
Avi.