Q1. Name the left-bank tributary of the Brahmaputra River.
A Subansiri
B Kameng
C Burhi Dihing Correct
D Sankosh
Explanation
Burhi Dihing is treated as a left-bank tributary of the Brahmaputra, joining it from the south-bank side in Assam. The other names listed are commonly associated with the right-bank, or north-bank, drainage of the Brahmaputra system. Subansiri is a major northern tributary, Kameng also joins from the north, and Sankosh belongs to the northern tributary belt toward the western part of the basin. Since the question asks specifically for a left-bank tributary, Burhi Dihing is the correct match according to the official key.