21 March 2018
If interest is from NRO Deposits, then the same would have been tax deducted at source by the Bank. The non resident has to file the return
21 March 2018
As for your third question, if the income is earned in India and is repatriated to the USA, the income is taxable in India fully. Remittance will not be taxed again in India as the tax would have paid already