Sure Sanjeev, I am a job portal user myself.
I understand your question. I can help you with the same.
First of all - Naukri, Monster, and other credible job portals follow a pay-to-use policy. So, any employer who wants to post their job requirements must have paid for their need, and it is a pretty high cost for the same. Therefore, people, employers, or HR would think twice before posting any jobs there - I believe I have clarified whether the jobs posted are genuine.
If you still feel that this may not be a solution to your question, you can note that there is a possibility to contact the company via phone or email. Hence, you can always clarify if the position still exists and expect to receive a follow-up.
All you need to ensure is that you have a good covering letter (specific to the post you are applying for, addressing the recruiter) and mention your contact details correctly. If you are outside India, you can always ask the recruiter for the best time (Indian time) you can reach them to discuss the position. This way, the recruiter also feels that you are genuinely seeking feedback.