As you know, Science doesn't only give you knowledge but also more enthusiasm. You can use Science in different fields. When it comes to the field of nation developed here's what you'll consider.
1) You can use Science by creating more powerful weapons for our Indian Army, so that one day we'll beat the weaponaries of USA!
2) Wouldn't it be nice, if nobody was ill and everybody was cured? Use Science and remove diseases from India. Make It A Disease-Free Country.
3) Imagine you being a scientist and you see so much of pollution when touring India. Wouldn't you rather like to clean it? That might not be possible but you can surely make a change by finding techniques of making water cleaner and planting more trees :)
Hope it helps. Please vote it as the brainiest answer!