Chapter 1


Assam: Locational Significance, Physiographic 

Divisions,Climate, Soil

Exercises

1. (a) What percentage of the area of the whole of India is covered by the State of Assam?

Answer: The State of Assam covers 7.7 per cent of the total area of India.

(b) Name the two foreign countries bordering Assam?

Answer: Two foreign countries bordering Assam are Bhutan and Bangladesh.

(c) Name the states of the Indian Administration bordering Assam in order?

The states of India bordering Assam are Arunachal Pradesh, Nagaland, Manipur, Mizoram, Meghalaya, and West Bengal .

(d) What is the area of the plateau region of Assam?

Answer: The plateau region of Assam covers an area of 7400 sq. km.

(e) What is the name of the plain that separates the Karbi-Rengma Plateau from the Barail Bhangil Mountains?

Answer: The plain that separates the Karbi-Renka Plateau from the Barail Bhangil Mountains is called Kapili-Dabka.

(f) What is the name of the highest peak in Assam located in the Rengma Hills?

Answer: The highest peaks of Assam are located in the Rengma Hills and are called Singhasan and Dambuks.

(g) By what name are the Patkai Mountains known in the southern part of Myanmar?

The southern part of the Patkai Mountains is known as Reguyoma .

(h) What is the name of the sedimentary land extending from Jonai in the east to Sonkosh in the west in the northern part of the Brahmaputra Valley at the foot of the Himalayas?

Answer: The Bhavartarai region is a sedimentary area located in the northern part of the Brahmaputra Valley at the foot of the Himalayas and extending from Jonai in the east to Sonkosh in the west.

(i) The Barganga is a tributary of which river in Assam?

The Barganga is a tributary of the Brahmaputra on the north bank of Assam.

(j) What is the name of the Brahmaputra river flowing north of Majuli?

Answer: The cotton of the Brahmaputra flowing north of Majuli was called Kherkutia. 

(k) What is the average slope of the Barak Plain?

Answer: The average slope of the Barak Plain is 20 cm per km.

2. The Barail Mountains were formed during which two geological periods?

Answer: The Barail Mountains were formed during the Eocene and Oligocene geological periods.

3. The Luva aquifer separates two faults composed of rocks of which two ages?

Answer: The Luva watershed separates two land masses composed of Gondwana and Tertiary rocks.

4. The The 'Bhar-Tarai region' is located between which two places in Assam?

Answer: The Bhawar-Tarai region in Assam is situated between the Sonkosh River to the west of the Murk Tchelek region of the Brahmaputra Plain.

5. The Giripadi Plain on the southern bank of the Brahmaputra is seen between which two places?

The Giripadi Plain is located on the southern bank of the Brahmaputra between Golaghat and Dibrugarh.

6. Draw a model map of Assam and identify the main geographical divisions.

Answer: For Student

7. What climate model does Vladimir Kopen include in the climate of Assam?

Answer: The climate of Assam is included in the subtropical dry winter tropical model by Vladimir Kopen.

8. What is the name of the wind that flows around Rangali Bihu in Assam?

The winds blowing around Rangali Bihu are known as Bardaisila and Tornado in Assam .

9. The speed of the monsoon winds in Assam depends on-

(a) Speed of air pressure intensity

(b) Topography

(c) Friendship

(d) On all of A, B, and C above

Answer: (a) The speed of air pressure intensity.

10. Where does the Cancer Revolution Line cross in Assam?

(a) Northwards

(b) Southwards

(c) Through the right

(d) due east

11. What is the average temperature in summer and winter in Assam? 

The average temperature in Assam is 280 °C in summer and 130 °C  in winter . 

12. What is the average rainfall in Assam during summer and winter?

Answer: The average rainfall in Assam during summer and winter is-

    The summer rainfall is 220 cm and the winter rainfall is 12 cm.

13. The climate of Assam depends on which factors?

Answer: The factors that depend on the climate of Assam are:

    (a) Subtropical location,

    (b) Landscape and Friendship,

    (c) the completely opposite and opposite pressures formed in the northwest and northeast of the Bay of Bengal and their temporary displacement according to the seasons;

    (d) effects of tropical marine air currents, and

    (e) Effects of wind currents from local mountainous and valley areas.

14. In which region of Assam is concrete-mixed red clay found?

Answer: The areas where concrete-mixed red soil is found in Assam are Karbi Anglong, Dima Hasao, and in places in the southern part of the Brahmaputra Valley. Red soil is also found in the eastern part of Nagaon district and in the hilly areas of South Kamrup district.

15. Which soil is widely found in Assam and usually does not contain lime, iodine, potash, phosphorus etc.?

Answer: Red soil, which is widely found in Assam, usually does not contain lime, iodine, potash, phosphorus etc.

16. What is humus?

Answer: Humus means soil or earth.

17. Which soil in Assam is best for tea cultivation?

Answer: The loamy soils of Assam are excellent for tea cultivation.

18. New alluvial soils are found in which two floodplains of Assam?

Answer: New alluvial soils are found on both the north and south banks of the Brahmaputra Valley of Assam.

19. What are the other types of broadly divided land classes in Assam?

There are 4 types of broadly divided land classes in Assam and they are-

(a) Loamy soils,

(b) Hilly soil,

(c) Red soil, and

(d) Concrete or laterite soils.