It's interesting to note that much of the tradition of western rocketry is descended from captured and reverse-engineered Mysorean rockets. And most of the rest of the western tradition of rocketry is descended from half-crazed Russian mystics and Egyptian ceremonial magicians. But that's another story entirely...
I find it hard to believe. Any references?
India wasn't as backwards as you might suppose, there were lots of areas of technology they were very good at such as chemistry and metalurgy. After the Battle of Plassey, I believe, the British captures a number of Indian cannons and found that they were better than the guns that the British had. Of course, they all had different bores and it was too logistically difficult to keep that many different kinds of ammunition, so the British just destroyed them. Which, I think, goes a long way towards illustrating the actual reasons the British ended up ruling India.