Greetings,

The marksheet of 10th class is the usual document required as proof of DOB almost everywhere unless the organization or institution you are applying to has specified otherwise:

In the case of Inspire scholarship, they do accept 10th marksheet as proof of DOB as it is clearly stated in their call for applications advertisement:

here is a link to the ad wherein you can check the eligibility (in the last page)

file:///C:/Users/PKP/Downloads/Advertisement.pdf

good luck