I recently asked a question on Arqade and getting downvotes after answering my own question.
What could be the possible reason of downvotes?
Please help me understand. I won't ask this type of questions again if it's an off-topic.
"Lack of research effort" would be my guess. It's right there in the tool-tip for the down-vote button.
Your question has not received a single close vote for being off-topic.
As a general advice, I'd ask back for downvote reasons in the comments when unsure. Most people will explain when asked.