hi malat ,

Scholarships, grants, and fellowships are generally based on the student's academic ability and performance through the years. Only an academically outstanding student is considered for this type of a reward. Every year thousands of students, looking at studying abroad, hunt for information about scholarships that are available to them. the below link provides you a hige list of scholarships given by indian government to indian students to do their phd's in the united states of america and the eligibility required , procedure etc .

http://www.indiaeducation.net/studyabroad/usa/scholarships.html

all the best