Which river is the longest tributary of the Ganga?
A. Yamuna
B. Son
C. Ghaghara
D. Gandak
Answer: Option A
Solution (By JKSSB Mock Tests)
The Yamuna is the longest and the westernmost tributary of the Ganga. It originates from the Yamunotri Glacier in the Uttarakhand Himalayas and joins the Ganga at Triveni Sangam in Prayagraj.
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