Which of the following rivers is famous for its fault valley drainage?

1. A

   Chambal

   (a) Chambal. Famous for ravines and badland erosion on the Yamuna right bank, not as the textbook fault-valley (rift) drainage.

2. B

   Damodar

   (b) Damodar. The Damodar occupies a rift/fault trough on the Chhotanagpur plateau—the classic Indian example of fault-valley drainage and the old ‘Sorrow of Bengal’ floods. That is the official key.

3. C

   Gandak

   (c) Gandak. A Himalayan snow-fed tributary of the Ganga with alluvial fans, not a peninsular fault trough.

4. D

   Ramaganga

   (d) Ramganga. A Kumaun Himalayan river; drainage is not cited as fault-valley in the same sense as Damodar.

Summary. Official key is (b) Damodar. Fault-valley or rift drainage in Indian school geography is the Damodar trough across Chhotanagpur. Chambal is badlands, Gandak and Ramganga are Himalayan. Honour the stored letter (b).