Consider the following tributaries of River Yamuna and arrange them from West to East : 1) Betwa 2) Ken 3) Sindh 4) Chambal Select the correct answer from the codes given below

Sort these by where each joins the Yamuna, moving from west to east. The Chambal meets the Yamuna at Pachnada in Etawah district, the westernmost of the four, so it comes first. Next is the Sindh, which joins in the Jalaun-Kalpi belt, a little east of the Chambal. The Betwa joins near Hamirpur, and the Ken joins further east near Chilla in Banda, the easternmost of the four.

So the order is 4, 3, 1, 2, which is option A. The wrong options fail on this sequence:

• B puts Betwa first, but Betwa lies east of both Chambal and Sindh.
• C puts Sindh first, though Sindh joins east of Chambal.
• D puts Ken at the western end, which is the wrong end entirely.

Concept: the Chambal system (Chambal, Sindh, Betwa, Ken) drains the Vindhyan and Malwa plateau into the Yamuna's right bank. Mains link: inter-state river management, including the Ken-Betwa link project.

Trap: candidates sort by the source regions or the size of the rivers rather than by the confluence points on the Yamuna, and so swap Sindh and Betwa.