India's oldest oil well and oldest operating refinery are located at which place in Assam?
- A.Duliajan
- B.Digboi
- C.Numaligarh
- D.Bongaigaon
Show answer
Digboi in the Tinsukia district is where oil was first struck in India in the late nineteenth century, and the refinery built there is the oldest in the country still working.
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