Question

what is ballot paper? name the machine by which they have been replaced.

Answer 1

ballot paper is a device which is used to cast a vote during the time of election
EVM is the machine by which it is replaced

Answer 2

Ballot papers were used for election purpose earlier in india...on the paper information about the voters were given...ballot paper method for conducting elections was very time taking....hence ballot paper was replaced by EVM (electronic voting machine)