For the people who are using Airtel Broadband you can check your broadband speed by this simple test provided at their homepage itself. In order to check the speed of your Airtel Broadband connection your PC need to have Java installed or else you need to install it.
Here is the result what it shows on my Internet connection.
The results vary in different tools of internet speed test, just because of the different locations detected and the other reason being that the speed keeps varying. If at all we are downloading something and testing the speed of the broadband at the same time, the results would surely vary.