Q1. Which of the following rivers is not a part of the Indus River System?
A Chenab
B Kosi Correct
C Ravi
D Satluj
Explanation
Kosi is not part of the Indus River System; it belongs to the Ganga system and flows from the Himalayan region into Bihar before joining the Ganga. Chenab is one of the major Indus tributaries. Ravi is also a recognised river of the Indus system. Satluj, or Sutlej, is another major Indus-system river and is associated with the Punjab river network. Since the question asks for the river outside the Indus system, Kosi is the correct answer.