How to make undefined host go to default Page in apache2 virtual hosts

I am using named Virtual hosts

NameVirtualHost *:80

<VirtualHost *:80>
    ServerAdmin [email protected]
    DocumentRoot "/usr/local/apache2/docs/thegeekstuff"
    ServerName test1.mydomain.com
    ServerAlias www.test1.mydomain.com
    ErrorLog "logs/thegeekstuff/error_log"
    CustomLog "logs/thegeekstuff/access_log" common
</VirtualHost>

<VirtualHost *:80>
    ServerAdmin [email protected]
    DocumentRoot "/usr/local/apache2/docs/top5freeware"
    ServerName test2.mydomain.com
    ServerAlias www.test2.mydomain.com
    ErrorLog "logs/top5freeware/error_log"
    CustomLog "logs/top5freeware/access_log" common
</VirtualHost>

At the moment i have not defined www.mydomain.com but when i open in browser it goes to my test1.mydomain.com

Is there any way that if i did not explicitly define that it redirect to either APache conf page

Also if i type ip address only then it also goes to that site.

I want that also to go to that undefiend page or something else

The site that gets served when no <VirtualHost> matches for that NameVirtualHost is the first one to load.

Just put a <VirtualHost> block above your others with a bogus ServerName, which serves the content that you want to be default.