what are default password of these users : root, daemon, bin, sys, sync, games, man, lp, mail, news, uucp, nobody.

You can check the status by looking in the shadow password file (/etc/shadow) at the second field. By default these accounts are locked (the password is set to *), which disables logins.

Can anyone login through ssh or ftp by these users ??

Not unless you have set a password for them.