Hi @Amol_D
You can still find out the topic that particular message was published. I’m guessing for dotnet you can use the IMessage.Destination properties ( ref )
But…
I had to ask, why would you want to do that? What is the objective?
A couple of points came to mind:
The idea of having Queues as your ‘consumption’ endpoint with topic subscriptions - means you get the flexibility of adding/changing topic subscriptions without any impact on the consumer apps. If you’d like to subscribe directly to such topics, but do not require persistency, then just do a direct topic subscription. Here’s the tutorial for dotnet for reference. Or, you could just create another Queue for that specific topic subscription 
-Ari