Class 9 Exam  >  Class 9 Notes  >  Social Studies (SST) Class 9  >  Extra Question & Answers (Part - 1) - Drainage

Class 9 Geography Chapter 3 Extra Question Answers - Drainage

1) What is the common characteristic of the Sambhar, Pulicat and Chilika lakes?

Answer:They are all salt water lakes.  

2) Which is the largest natural inland lake in India?

Answer:The Wular lake in Jammu and Kashmir, with a maximum area of 260 sq km, is the largest natural inland lake in India.     

3) The Satluj is a tributary of which river?

Answer:The river Satluj is a tributary of the Indus and joins it in Pakistan.  

4) What are other names given to the Brahmaputra river?

Answer: Tsangpo is the name of the Brahmaputra in Tibet (China) and Dihang is its name in Arunachal Pradesh.  

5) What is the Sunderban famous for?

Answer:Sunderban is famous for being the home of the Royal Bengal tiger.  

6) Through which states in India does the river Satluj flow?

Answer:The river Satluj flows through the states of the  Himachal Pradesh and the Punjab in India. 

7) What is the major objective of the National River Conservation Plan (NRCP)?

Answer:Under this action plan, pollution abatement works in Indian rivers are being taken up. Initially, 215 schemes of pollution abatement have been sanctioned. So, far 69 schemes have been completed under this plan. A total of one million litres of sewage is targeted to be intercepted, diverted and treated.  

8) Identify the rivers of which the following are tributaries: the Gandak, the Dibang, the Ganga and the Tungabhadra.

Answer: The Gandak is a tributary of the Ganga, the Dibang is a tributary of the Brahmaputra, the Ganga is a tributary of the Meghna (in Bangladesh) and the Tungabhadra is a tributary of the Krishna.  

9) Which of the three rivers, the Chenab, the Ravi and the Beas, flows in India only through the state of Jammu and Kashmir?

Answer:The Chenab flows only through the state of Jammu and Kashmir in India. The Ravi and the Beas rivers flow through the Punjab and the Himachal Pradesh in India.  

10)   List three salient features of inland salt lakes.

Answer: The three features are
(i) They are found in arid or semi-arid regions of the country.
(iii) They dry up during summers.
(iii) They are fed by short and intermittent streams.  

11) Is it true that the water in a delta is salty, as it is close to the sea?

Answer:Since, the sea is at a lower level than the river in a delta, normally the delta will not be salty.  

12) Which river in South India receives water both in summer and winter?

Answer:The river Kaveri rises in the Western Ghats and thus receives water from the summer monsoon. Since, it flows through Tamil Nadu into the Arabian sea, it receives rainfall from the winter monsoon also.                

13) Which of the rivers Beas, Ghaghara, Indus and Yamuna rises from a glacier in Uttarakhand?

Answer:  The Yamuna rises from the Yamunotri glacier in  Uttarakhand. The Beas rises in Himachal Pradesh, the Indus in China (Tibet) and the Ghaghara in Nepal.  

14) Which is the highest waterfall in India?

Answer: The Kunchikal falls on the river Varahi in Karnataka have a drop of 455 m. 

15) Which river flows for the longest length in India?

Answer:The Ganga river flows for 2525 km in India. Although other rivers like the Brahmaputra and Indus may be longer in their total length, their length of flow in India is much less than that of the Ganga. 

16) Which of the lakes out of Nagaijuna Sagar, Loktak, Chilika and Gobind Sagar are artificial lakes?

Answer:Nagarjuna Sagar is an artificial lake created by damming the Krishna river. Gobind Sagar lake in Himachal Pradesh has been artificially created by damming the Satluj river with the Bhakra dam.  

17) Why has industrial development flourished along rivers?

Answer:The reason for industries being near rivers is because of the free availability of fresh water required for industrial processes.  

18) Out of the tributaries Ghaghara, Son, Kosi and Yamuna, which ones join the Ganga from the South and which from the North?

Answer:The Yamuna and Son rivers join the river Ganga from the South, while the Ghaghara and Kosi Join it from the North.  

19) What is the meaning of the word 'doab'?

Answer: In the Persian language, 'do' means 'two' and 'ab' mean 'water'. So 'doab' means a tract of land lying between two confluent rivers 

20) The Kaveri basin covers parts of which Indian states?

Answer: The Kaveri basin covers parts of Karnataka, Tamil Nadu and Kerala.  

21) Which is the longest river of peninsular India?

Answer:  The river Godavari, with a length of 1465 km, is the longest river of peninsular India.  

22) What do you understand by the term "Drainage Basin"?

Answer:The area drained by a single river system is called "Drainage Basin".  

23) Name the place where the Ganga emerges from the mountains on to the plains.

Answer: At Haridwar, the Ganga emerges from the mountains on to the plains.  

24) Name the Indian state where river Brahmaputra enters in India.

Answer:At the Indian state of Arunachal Pradesh river Brahmaputra enters in India.  

25) Which is the longest river of the peninsular plateau?

Answer: River Godavari is the longest river of peninsular plateau.  

26) Which river is known as "Dakshin Ganga"?

Answer:The Godavari, because of its length and area it cover is known as 'Dakshin Ganga'.  

27) Which is the largest freshwater lake of India?

Answer: The Wular lake is the largest freshwater lake of India. 

28) Name the saline water lake located in Rajasthan,

Answer: The saline water lake located in Rajasthan is the Sambhar lake.   

29) Name the Indian states through which Kaveri river passes.

Answer:Kaveri river passes through Indian states of Karnataka, Kerala and Tamil Nadu. 

30) At which place do the Satluj, the Beas, the Ravi, the Chenab and the Jhelum rivers join together to enter the river Indus?

Answer: The Satluj, the Beas, the Ravi, the Chenab and the Jhelum rivers join together to enter river Indus at Mithankot in Pakistan. 

31) What is the origin of the River Krishna?

Answer: River Krishna rises from a spring near Mahabaleshwar (Maharashtra).  

32) Which drainage pattern does the river Ganga forms?

Answer: River Ganga forms dendritic drainage pattern.  

33) Where does river Narmada has its source?

Answer:The Narmada rises in the Amarkantak hills in Madhya Pradesh. 

34) Which is the largest brackish water lake in India? Where it is located? 

Answer:The Chilika lake is the largest brackish water lake in India. It lies in the state of Odisha to the South of Mahanadi delta.  

35) Make a comparison in tabular form between the East flowing and West flowing rivers of the Peninsular plateau. Or Differentiate between East flowing and West flowing rivers of Peninsular plateau. Mention their name also. Or Differentiate between the salient features of East flowing and West flowing rivers of Peninsular India.

Answer: Comparison between the East/lowing and West flowing rivers of the Peninsular plateau

  • East Flowing Rivers
    West Flowing Rivers
    These rivers originate from the Western Chats and flow Eastwards.
    These rivers originate in central India and flow Westwards.
    These rivers flow into the Bay of Bengal.
    These rivers flow into the Arabian sea.
    These rivers form deltas at their mouths.
    These rivers form estuaries at their mouths.
    They carry larger amount of water.
    They carry a lesser amount of water.
    Examples are Mahanadi, Godavari, Krishna and Kaveri.
    Examples are Narmada and Tapi.

36) Explain what life would be like if freshwater is not available.

Answer:For survival, man depends on water. It circulates and goes through our bodies, replenishing nutrients and carrying away waste materials. Without freshwater, no activities of human beings and life would be possible. Seawater is salty and it cannot substitute for freshwater. Life as we know it, will not be there. No, trees will be able to grow and no land based animals can survive. Even birds will not exist.  

37) Describe inland drainage, giving its main features.

Answer: When rivers do not reach a sea or ocean, but empty their water in an inland sea or lake, this is known as inland drainage. Its main features are (i) The streams joining lakes or inland seas are fed by rainwater. (ii) During the rainy season, we may have flash floods and during other seasons they may dry up. (iii) In some cases they may form salt water lakes, like the Sambhar lake in Rajasthan.  

38)  Make a comparison in tabular form between a delta and an estuary.

Answer: Comparison between a delta and an estuary                

These are triangular deposits made by rivers at their mouths.
These are sharp edged mouths of rivers without any deposits.
Formed in regions of low tides and coastal plaints.
Formed in regions of high tides and rift valleys.
These are agriculturally fertile lands.
They are not agriculturally fertile lands

39)  List the differences between glaciers and rivers.

Answer:  Differences between glaciers and rivers

  • Feature
    Composition and speed
    It is composed ice  moving at a very slow speed.
    It is composed of water flowing at a faster speed.
    These are found either on snow-capped mountains or in higher latitudes.
    These are found from mountain tops to the oceans and all latitudes.
    They are wide and deep, filling a whole valley.
    They are shallower and confined to a narrower channel. 

40) Distinguish between a tributary and a distributary.

Answer: A tributary is a stream which flows into a main stream (or parent) river. A tributary does not flow directly into a sea, ocean or lake.  Tributaries  and the main stream river drain the surrounding drainage basin of its surface water and groundwater. The reverse to a tributary is a distributary, a river that branches off and flows away from the main stream. The Yamuna is a tributary of the Ganga, whereas the Hugli is a distributary of the Ganga.  

41) Make a list of natural and artificial lakes with the help of the atlas.

Answer:Natural Lakes Wular lake, Dal lake, Nainital lake, Bhimtal lake, Loktak lake, Barapani lake, Chilika lake, Sarnbhar lake, Pulicat lake, Kolleru lake, Vembanad lake. Artificial Lakes Guru Gobind sagar, Rana Pratap sagar, Nizam sagar, Nagarjuna sagar, Hirakud.  

42) Below are given names of a few lakes of India. Group them under two categories, natural and created by human beings. _____________________________ (a) Wular________ (b) Pal________ (c) Nainital_______ (d) Bhimtal______ (e) Gobind Sagar_____(f) Loktak_______ (g) Barapani_______ (h) Chilika_______ (i) Sambhar_______ (j) Rana Pratap Sagar (k) Nizam Sagar_____ (I) Pulicat_______ (m) Nagarjuna Sagar (n) Hirakud

Answer:Natural Lakes Wular, Dal, Nainital, Bhimtal, Loktak, Barapani, Chilika, Sambhar and Pulicat. Manmade Lakes Gobind Sagar, Rana Pratap Sagar, Nizam Sagar, Nagarjuna sagar and Hirakud.  

43) Why are rivers important for the country's economy?
Answer: Rivers are important for the country's economy because water from the rivers is a basic natural resource is essential for various human activities. The importance of the rivers for the country's economy are
(i) The rivers provide water for irrigation.
(ii) They provide fertility to the soil.
(iii) They are useful for navigation.
(iv) They help to generate hydroelectricity.
(v) They help to develop tourism.
(vi) They provide water for various domestic uses.
(vii) They provide livelihood to fishermen.
(viii) They help to moderate the climate and environment of nearby areas.

The document Class 9 Geography Chapter 3 Extra Question Answers - Drainage is a part of the Class 9 Course Social Studies (SST) Class 9.
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FAQs on Class 9 Geography Chapter 3 Extra Question Answers - Drainage

1. What is drainage and why is it important?
Ans. Drainage refers to the system of removing excess water from an area, such as from fields, roads, or buildings. It is important because it helps prevent waterlogging, which can lead to various problems like reduced crop yield, damage to infrastructure, and the spread of diseases.
2. What are the different types of drainage systems?
Ans. There are two main types of drainage systems: surface drainage and subsurface drainage. Surface drainage involves the removal of excess water from the surface through channels, ditches, or drains. Subsurface drainage, on the other hand, involves the use of pipes or drains installed below the ground surface to remove excess water from the soil.
3. How does surface drainage work?
Ans. Surface drainage works by creating a slope or gradient in the land, which allows water to flow away from the area. This can be achieved by constructing channels, ditches, or drains that direct the water towards a suitable outlet, such as a river or a reservoir. Surface drainage is commonly used in agricultural fields and urban areas.
4. What are the benefits of subsurface drainage?
Ans. Subsurface drainage offers several benefits. It helps improve soil structure by preventing waterlogging, which can lead to compaction and reduced fertility. It also helps control the water table and prevents the accumulation of excess salts and minerals in the soil. Subsurface drainage is particularly useful in areas with high rainfall or poor soil drainage.
5. How can I improve the drainage in my garden?
Ans. To improve drainage in your garden, you can take several measures. First, ensure that the soil is well-drained by adding organic matter, such as compost or peat moss, to improve its structure. Second, avoid overwatering your plants and provide proper spacing to prevent waterlogging. Third, consider installing a drainage system, such as French drains or gravel-filled trenches, to redirect excess water away from the garden area.
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