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Drainage : NCERT Exercise Questions


Q.1     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
           (b)  Centrifugal
           (c)  Dendritic
           (d) Trellis
Sol.      (c) Dendritic


(ii)     In which of the following states is the Wular lake located?
          (a) Rajasthan
          (b) Punjab
          (c) Uttar Pradesh
          (d) Jammu and Kashmir
Sol.    (d) Jammu and Kashmir


(iii)     The river Narmada has its source at
           (a) Satpura
           (b) Amarkantak
           (c) Brahmagiri
           (d) Slopes of the Western Ghats
Sol.     (b) Amarkantak


(iv)     Which one of the following lakes is a salt water lake?
           (a) Sambhar
           (b) Wular
           (c) Dal
           (d) Gobind Sagar
Sol.     (a) Sambhar


(v)     Which one of the following is the longest river of the Peninsular India?
          (a) Narmada
          (b) Godavari
          (c) Krishna
          (d) Mahanadi
Sol.    (b) Godavari


(vi)     Which one amongst the following rivers flows through a rift valley?
           (a) Mahanadi
           (b) Krishna
           (c) Tungabhadra
           (d) Tapi
Sol.     (d) Tapi


Q.2     Answer the following questions briefly.
(i)       What is meant by a water divide? Give an example.
Sol.     Any elevated area separates two drainage basins. Such upland is called a water divide.


(ii)     Which is the largest river basin in India?
Sol.    The Ganga River Basin


(iii)     Where do the rivers Indus and Ganga have their origin?
Sol.     In the Himalayas


(iv)     Name the two headstreams of the Ganga. Where do they meet to form the Ganga?
Sol.     Bhagirathi and Alaknanda are the two headstreams of Ganga. They meet at Devprayag to form the Ganga.


(v)     Why does the Brahmaputra in its Tibetan part have less silt, despite a longer course?
Sol.    Since Tibet is a cold and dry area, so Brahmaputra in this part carries less silt despite having a longer course.


(vi)     Which two Peninsular rivers flow through trough?
Sol.     Narmada and Tapi


(vii)     State some economic benefits of rivers and lakes.
Sol.      Lake can be used for generating hydroelectricity. A lake can be a good tourist attraction. Rivers have been the centre of human civilization since ancient times. Even today, many big cities are situated on the bank of a river. River water is used for irrigation, navigation, hydroelectricity, fisheries, etc.


Q.3     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) Hirakund
Sol.     Natural Lakes: Wular, Dal, Bhimtal, Loktak, Barapani, Chilika, Sambhar, Pulicat
Man-made Lakes: Gobind Sagar, Rana Pratap Sagar, Nizam Sagar, Nagarjuna Sagar, Hirakund


Q.4     Discuss the significant difference between the Himalayan and the Peninsular rivers.
Sol.

Himalayan Rivers Peninsular Rivers
Originate from the Himalayas.  Originate in the Deccan Plateau.
Most of then are very long. Most of them are shorter.
A perennial.   Many of them dry up during rainy season.
Have much larger basins. Have smaller basins.

 


Q.5     Compare the east flowing and the west flowing rivers of the Peninsular plateau.
Sol.      The east flowing rivers of the Peninsular part drain into Bay of Bengal and form deltas at their mouths. The west flowing rivers drain into the Arabian Sea and form estuaries. Most of the east flowing rivers are longer, compared to most of the west flowing rivers.


Q.6     Why are rivers important for the country’s economy?
Sol.      Rivers are the major source of water for irrigation and hence are important for a country where farming is still the occupation of the largest portion of population. Many major rivers serve as important channels for transporting goods and people and thus play important role in the supply chain. Many multipurpose projects have been built on most of the major rivers in India. Rivers are important source of fish to a large population.


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


2.     The longest river of India.
Sol.   Ganga


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


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


5.     The river which was known as the “Sorrow” of West Bengal.
Sol.   Damodar


6.     The river on which the reservoir for India Gandhi canal has been built.
Sol.  Sutlej


7.     The river whose source lies near Rohtang Pass.
Sol.  Ravi


8.     The longest river of Peninsular India?
Sol.  Godavari


9.     A tributary of Indus originating from Himachal Pradesh.
Sol.  Chenab


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


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


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


13.     An important river of the Indian desert.
Sol.     Luni


14.     The river which joins Chenab in Pakistan.
Sol.     Jhelum


15.     A river which rises at Yamunotri glacier.
Sol.    Yamuna

                                Class nine Geography drainage ncert crossword 15 



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