I wanted to know if there is an effect on Adsense Earnings through adding irrelevant tags for a Blog. For example if a user adds a Tag related to Finance in a Technology Article written on a blog and the tag is totally irrelevant to the Post Would Google penalize the User Posting that Tag.
If you go for advanced details, then yes. A laser targeted topic attracts ads from companies which want laser targeted traffic. Thus you know high earnings.
it depends, tags are made to list content pages on your blog with the same tag. If you put many unrelated tags with no other content than your blog post, it becomes useless and will not work. Better have fewer tags but listing many content.