Thank you for the quick and helpful response.
I am first searching for the top trends in my country(India) using the GET trends/place api using the following query:
https://api.twitter.com/1.1/trends/place.json?id=23424848
Then I use the query parameter received and use the GET search/tweets api to get the tweets for the trending topics.
I found that there is a response in most cases and in some cases there is not.
Since I am querying for the trending topics, I have been assuming there will be popular tweets for that topic.
Also, the number of tweets that are returned are always at a maximum of 15, even though I am passing the count parameter. The returned result also always gives a max_id = 0 while searching for popular tweets.
Thanks a lot for the help!