Which of the following tributaries of the Brahmaputra River originates in Arunachal Pradesh and joins the main river from its northern (right) bank within Assam?

💡 Solution & Explanation

The Subansiri River is the largest tributary of the Brahmaputra, originating in the Himalayas of Tibet and Arunachal Pradesh before entering Assam and joining the Brahmaputra from the right bank. Plausible alternatives like the Kopili and south-bank Dhansiri originate from the Meghalaya and Naga hills respectively, joining from the left bank. The Subansiri basin holds significant hydroelectric potential currently harnessed through major infrastructure projects.