Q. Which of the following are south bank tributaries of the Brahmaputra in Assam?

1. Kopili
2. Kulsi
3. Beki
4. Digaru

Select the correct option from the codes given below:
Answer: 1, 2, and 4 only
Notes: Kopili, Kulsi, and Digaru originate from the Meghalaya Plateau and join the Brahmaputra from the south bank. Beki is a north bank tributary, originating in Bhutan as part of the Manas River system. Therefore, only 1, 2, and 4 are south bank tributaries influencing flood and sediment patterns in Assam.