Why are On Hold Questions included in 'Active'
Since they might have been edited, and the edit is so good that the question qualifies to be reopened. Yes, we have a review queue for that, but it's also good that the questions are visible in the regular Q&A pages. Also, if somebody vandalizes their post or edits in some offensive language, we want to be able to monitor that.
Can we please have a tab that gives us the questions that are eligible for answers.
This is part of the aim of the new 'Custom Questions Lists' functionality. For more information about that, see Custom question lists: finding questions you can answer. If you don't want to use those, note that the default tab on the Questions page is 'Newest', not 'Active'. (Though the system remember your choice.) New questions can be on hold as well, but this won't happen that often as on the active tab. There's also a special Unanswered tab which might help you finding questions you can answer.