Consider the following tributaries.

1. Alaknanda
2. Bhagirathi
3. Dhansiri
4. Gandhak

Which of the above rivers are tributaries of River Ganges?
a) 1 and 2 only
b) 2, 3 and 4 only
c) 1, 2 and 4 only
d) 1, 2, 3 and 4

Ans-[C] 

Explanation – This is basic NCERT question. Ganga river is formed by the Gangotri Glacier, a vast expanse of ice, five miles by fifteen, at the foothills of the Himalayas in North Uttar Pradesh, is the source of Bhagirathi, which joins with Alaknanda to form Ganga at Devprayag. The Gandhak, which comes from near Katmandu, is another big Himalayan tributary.

Dhansiri is tributary of Brahamputra.