Description : The oldest oil-field in India is in – (1) Haldia (2) Bombay High (3) Neyveli (4) Digboi
Last Answer : (4) Digboi Explanation: Digboi is a town and a town area committee in Tinsukia district in the northeastern part of the state of Assam. Today, though the crude production is not high, Digbot has ... , now a division of Indian Oil Corporation, is the world's oldest oil refinery still in operation.