NCERT Solutions for Class 9 Social Science Contemporary India Unit 3

Drainage Class 9

Unit 3 Drainage Exercise Solutions

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Exercise : Solutions of Questions on Page Number : 23

Q1 :  

Choose the right answer from the four alternatives given below.

(i) Which one of the following describes the drainage patterns resembling the branches of a tree?

(a) Radial

(c) Centrifugal

(b) Dendritic

(d) Trellis

(ii) In which of the following states is the Wular Lake located?

(a) Rajasthan

(c) Punjab

(b) Uttar Pradesh

(d) Jammu and Kashmir

(iii) The river Narmada has its source at

(a) Satpura

(c) Amarkantak

(b) Brahmagiri

(d) Slopes of the Western Ghats

(iv) Which one of the follow


Answer :

(i) Which one of the following describes the drainage patterns resembling the branches of a tree?

(a) Radial

(c) Centrifugal

(b) Dendritic

(d) Trellis

(ii) In which of the following states is the Wular Lake located?

(a) Rajasthan

(c) Punjab

(b) Uttar Pradesh

(d) Jammu and Kashmir

(iii) The river Narmada has its source at

(a) Satpura

(c) Amarkantak

(b) Brahmagiri

(d) Slopes of the Western Ghats

(iv) Which one of the following lakes is a salt water lake?

(a) Sambhar

(c) Wular

(b) Dal

(d) Gobind Sagar

(v) Which one of the following is the longest river of the Peninsular India?

(a) Narmada

(c) Godavari

(b) Krishna

(d) Mahanadi

(vi) Which one amongst the following rivers flows through a rift valley?

(a) Damodar

(c) Krishna

(b) Tungabhadra

(d) Tapi

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Q2 :  

Answer the following questions briefly.

(i) What is meant by a water divide? Give an example.

(ii) Which is the largest river basin in India?

(iii) Where do the rivers Indus and Ganga have their origin?

(iv) Name the two headstreams of the Ganga. Where do they meet to form the Ganga?

(v) Why does the Brahmaputra in its Tibetan part have less silt, despite a longer course?

(vi) Which two Peninsular rivers flow through trough?

(vii) State some economic benefits of rivers and lakes.


Answer :

(i) Any elevated area, such as a mountain or an upland, which separates two drainage basins is known as water divide; for example, the water divide between the Indus and the Ganga river systems. Ambala is located on this water divide. The Western Ghats form the main water divide in Peninsular India.

(ii) The Ganga, which is over 2,500 km long, forms the largest river basin in India.

(iii) The river Indus rises in Tibet, near Lake Mansarowar.

The Ganga originates at the Gangotri Glacier on the southern slopes of the Himalayas.

(iv) The two headstreams of the Ganga are Bhagirathi and Alaknanda. They meet to form the Ganga at Devaprayag in Uttarakhand.

(v) Since Tibet has a cold and dry climate, the Brahmaputra carries a smaller volume of water and less silt in this region.

(vi) Narmada and Tapi are the two peninsular rivers flowing through trough.

(vii) Economic benefits of rivers and lakes:

(a) Source of fresh water

(b) Irrigation

(c) Navigation

(d) Hydro-power generation

(e) Development of tourism

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Q3 :  

Below are given names of a few lakes of India. Group them under two categories - natural and created by human beings.

(a) Wular

(b) Dal

(c) Nainital

(d) Bhimtal

(e) Gobind Sagar

(f) Loktak

(g) Barapani

(h) Chilika

(i) Sambhar

(j) Rana Pratap Sagar

(k) Nizam Sagar

(l) Pulicat

(m) Nagarjuna Sagar

(n) Hirakud


Answer :

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Q4 :  

Discuss the significant difference between the Himalayan and the Peninsular rivers.


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Q5 :  

Compare the east-flowing and the west-flowing rivers of the Peninsular Plateau.


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Q6 :  

Why are rivers important for the country's economy?


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Q7 :  

Project/Activity

Solve this crossword puzzle with the help of the given clues.

Across

1. Nagarjuna Sagar is a river valley project. Name the river?

2. The longest river of India.

3. The river which originates from a place known as Beas Kund.

4. The river which rises in the Betul district of MP and flows westwards.

5. The river which was known as the “Sorrow” if West Bengal.

6. The river on which the reservoir for Indira Gandhi canal has been built.

7. The river whose source lies near Rohtang Pass.

8. The longest river of Peninsular India.

Down

9. A tributary of Indus originating from Himachal Pradesh.

10. The river flowing through fault, drains into the Arabian Sea.

11. A river of South India, which receives rain water both in summer and winter.

12. A river which flows through Ladakh, Gilgit and Pakistan.

13. A important river of the Indian desert.

14. The river which joins Chenab in Pakistan.

15. A river which rises at Yamunotri glacier.


Answer :

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