NCERT Questions : Drainage - Class 9 PDF Download

Class IX, NCERT Geography - Contemporary India I

Lesson 3, DRAINAGE

Question.1: Which is the largest tributary of the Ganga?

Answer: The Yamuna is the largest and main tributary of the River Ganga.

Question.2: Which is the main watershed in Peninsular India?

Answer: The main watershed in Peninsular India is formed by the Western Ghats. 

Question.3: Define: (a) Oxbow lake, (b) Drainage, (c) Distributary, (d) Meandering and Meanders, (e) Delta, (f) Estuary, (g) Lake, (h) River.  

Answer:

(a) Oxbow Lake - Due to continuous erosion and deposition along the sides of the meanders, the end of meander loop come closer and closer. In due course of time the meander loops cut off from the river and forms a cut off lake also known as ‘Oxbow Lake’.

(b) Drainage - It can be defined as a system of flowing water from the higher level to the lower level. However, the term drainage is widely used to describe the river system of an area.

(c) Distributary - A channel which branches of from the main river and carries away a part of its water.

(d) Meandering and Meanders - The phenomenon of bending (winding) of a river in its lower course into small U-shaped loops is called as ‘Meandering’. Winding sections or loops of a river that swing from side-to-side as it flows over a level tract normally along its lower course are known as ‘Meanders’.

(e) Delta - A more or less triangular and level tract of alluvium formed at the mouth of a river entering a relatively quite body of a river. e.g. Sunderban delta.

(f) Estuary - It is the tidal mouth of a river where sweet and salty waters mix together. Estuaries are biologically one of the most productive zones in the world.

(g) Lake - a deep and vast depression on the surface of the earth filled with water.

(h) River - Rivers may be defined as natural streams of flowing water from a mountain, lake, spring etc. to the sea, lake or another water body.     

Question.4: Which river streams constitute the Northern Plains?

Answer: The Indus in the west and the Ganga-Brahmaputra in the east are the river streams which constitute the Northern Plains.

Question.5: What is the name of the important river found in the Indian desert?

Answer: Luni.

Question.6: With which river Nagarjuna Sagar river valley project is associated?

Answer: Krishna River.

Question.7: Which river originates from a place known as Beas Kund?

Answer: Beas (Also known as Vipasha).

Question.8: Which river is known as the “sorrow” of west Bengal?

Answer: Damodar River.

Question.9: Name the river(s) on which the Indira Gandhi canal has been built.

Answer: Beas and Sutlej.

Question.10: Which river flows through Ladakh, Gilgit and Pakistan?  

Answer: Indus River.

Question.11: Name the river whose source lies near Rohtang Pass. 

Answer: Beas.

Question.12: Name the states through which river Mahanadi flows.

Answer: River Mahanadi flows through MP, Chhattisgarh and Orissa before falling into the Bay of Bengal.

Question.13: Name the longest westward flowing river of Peninsular India.  

Answer: Narmada.

Question.14: What do you mean by ‘inland drainage’?

Answer: When waters of a river do not reach the oceans but fall into an inland sea or lake, such a drainage is called as ‘inland drainage’. Most of the rivers of Rajasthan are governed by inland drainage.