I got the solution.In weblogic10.3.0.0 for ear(consist of war and ejb jar),it wont show the welcomepage link while testing through webadmin cosonle unlike wl8 or wl10.3.2.0.We have to explicitly hit the url from browser.
e.g
Suppose your context root in appliication xml is like
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE application PUBLIC "-//Sun Microsystems, Inc.//DTD J2EE Application 1.2//EN" "http://java.sun.com/j2ee/dtds/application_1_2.dtd">
<application id="Application_ID">
<display-name>GMEReportingApp</display-name>
<module id="EjbModule_1050388015234">
<ejb>XYZ.jar</ejb>
</module>
<module id="WebModule_1050388594562">
<web>
<web-uri>ABC.war</web-uri>
<context-root>ABC</context-root> </web>
</module>
</application>
and in web.xml your welcomepage is mnc.html
then you have to hit
http://localhost:portno/ABC/mnc
it will work