1. Can zope do basic site management. for example missing link checks. say if we call an object which doesnt exist. can zope show us where we have gone wrong.(without actually checking each and every object manually)

No.

2. I have large number of small html documents(17,000). I want them to go in a database. can we automate this in zope to be uploaded it in the database.

Yep. Search the mail archives for loadsite.py

3. Say, i want to use a zope enable webiste on a non zope enabld server, so i need all the objects(e.g. html files) from the database to come out as files. can we do this(sort of Zope to non zope convertion)

If this is what you want, use Jonothan Farr's LocalFS product.

4. Which file do i need to upload to the isp end from the programmer end ,to make the site work. If we have to upload a single database it will take a lot of time. is there any incremental upload facility available. i have only ftp access with my ISP.

I'm not sure what you mean.

5. i need to build a directory like site somewhat like yahoo!, is there any toolkit available for it in zope.

I'm not sure. Check the Download section of Zope.org and click on Products.