Question

what is modern currency accepted as a medium of exchange without any use of its own find out the reason

Answer 1

The modern currency is not made up of precious metal such as gold, silver or copper and unlike grain and cattle, they are neither every day use. Thus, the modern currency is without any use.
But still it is accepted as a medium of exchange as it is authorised by Government of the country.
In India, the Reserve Bank of India issues currency notes on behalf of the central Government.
Thus, modern currency is accepted as a medium of exchange without any use of its own.

Answer 2

1-modern currency is widely accepted as a medium of exchange.  
2- unlike the the things used earlier, modern currency is not made up of valuable items like gold and silver. 
3- neither it is of everyday use, like grains and cattles.
4-therfore, modern currency is accepted bcz the govt. of the country accepts it. 
5-in india, RBI looks over the production of currency. 
6- no individual or a group of individuals, can produce money.
7- neither can anyone deny the use of RUPEES in India