Did you read the Wikipedia article they linked to? It was experience fighting against rockets in India that led the British to develop the Congrave Rocket, which was made famous in the "Rocket's Red Glare" line in the US National Anthem. Britain might have had military rockets at some point before that, but they hadn't used them for at least a century before that point.
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.
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.