Whether unspent foreign exchange brought back to India is required to be surrendered by a traveler?
Yes. He can, however, retain foreign currency upto U.S. $ 2000/- or its equivalent (including foreign exchange, if any, already held by him) for personal purposes, under the general permission given to persons resident in India to hold foreign currency and surrender the balance within 180 days after his return to an authorized dealer or a money-changer against payment in rupees.