I have done mturk but if one is doing it from India, there are very less opportunities ( i feel) and the money you get is not worth the time.
I have done it while here in US and the situation is almost similar. There are tasks but the return is not that great.
I earned about 45 $ in amazon GC balance through this.
Many of these opportunities are only for US residents. When i came to US i created a spam email id to register for such websites which pay for surveys etc etc but eventually i found that it is not worth the time and all those spam popups and registering at different sites to get those 10 - 50 cents is not worth it. I have stopped doing those now.
Till some time i was doing Swagbucks and that too only because i used a bot which would watch the videos automatically on swagbucks website and get me SBs. In that i have earned like 25 $ in Paypal money, 20 $ amazon GC and 25 $ JCPenney GC. But now the bot has stopped working and swagbucks has implemented captchas to get the points and i have stopped doing SBs too.