Download 9-social-ans

Standard
: IX
(FA-1-Answer Key)
Subject
: Social Science
---------------------------------------------------------------------------------------------------------------------------------Multiple choice questions
12 x ½ = 6
1.Orissa
2. 97° 25’ E 3. Nepal
4. Lakshadweep
5. two hours 6. East
7. Bhabar
8. Diverging 9. Bhangar
10. Khadar
11. 82030 E 12. 7,516.6
Give one word answer
6 x 1= 6
13.Tajikistan
14. Lakshadweep
15. Maldives and Sri Lanka 16. Lakshadweep
17. The Malwa plateau
18. converging
Short answers
6 x 3 = 18
19. Tectonic plates : The crust of the earth is not in the form of a continuous plate rather in the form of
broken pieces. These pieces of the earths crust are called tectonic plates.
20. Three major division of the Himalayas from north to south are:
*The Great or Inner Himalaya *The Lesser Himalaya or Himachal *The Shiwaliks
21.
Western Ghats
Eastern Ghats
They lie along the Arabian Sea.
They lie along the Bay of Bengal.
Average height is 900 m 1600 m
Average height is 600 m
They are almost continuous
They are interspersed by rivers
22. Describe how the Himalayas were formed.
The Indian Peninsula drifted towards the north and finally collided with the much larger Eurasian Plate. As a
result of this collision, the sedimentary rocks which were accumulated in the geosynclines (known as
Tethys) got folded and formed the mountain systems of the West Asia and Himalaya.
23. Write short notes on : The Island groups of India
The Lakshadweep Islands are in the Arabian Sea. Its area is 32 sq km. The administrative headquarters of
Lakshadweep is at Kavaratti island. This group of islands is rich in terms of biodiversity.
The Andaman and Nicobar Islands are bigger in size and has more number of islands. This group of islands
can be divided into two groups. The Andaman is in the north and the Nicobar is in the south. These islands
too have rich biodiversity.
24. Distinguish between : Bhangar and Khadar
Bhangar is the largest part of the Northern Plains and is formed by the oldest alluvium. On the other hand,
Khadar is the younger deposit of alluvium
Answer in detail
4 x 5 = 20
25. The sun rises two hours earlier in Arunachal Pradesh as compared to Gujarat in the west but the watches
show the same time. How does this happen?
The longitudinal gap between Arunachal Pradesh and Gujarat is about 30°. Due to this, there is time lag of
about two hours between these states. Since Arunachal Pradesh is in the east hence the sun rises earlier here;
compared to in Gujarat. The Indian Standard Time is taken from the time of Standard Meridian of India and
hence the watches show the same time in both the states.
26. The central location of India at the head of the Indian Ocean is considered of great significance. Why?
India is centrally located between the East and the West Asia. India is strategically located at the centre of
the trans-Indian Ocean routes which connect the European countries in the west and the countries of East
Asia. Thus, India could establish close contact with West Asia, Africa and Europe from the western coast.
Moreover, it could establish close contact with Southeast and East Asia from the eastern coast. This shows
the significance of India’s location in the Indian Ocean.
27. Which are the major physiographical divisions of India? Contrast the relief of the Himalayan region with
that of the Northern Plains of India.
The landmass of India can be divided into following major physiographic divisions:
The Himalayan Mountains The Northern Plains
The Peninsular Plateau
The Indian Desert
The Coastal Plains
The Islands
The Himalayan region is rugged and shows great variations in terms altitude. The Northern Plains, on the
other hand, is more or less level and has least variations in terms of altitude. The Himalayan region is
formed by rocks and unconsolidated sediments. The Northern Plains is composed of alluvial deposits.
28. Short notes on :(a) The Indian Desert : The Indian desert lies towards the western margins of the Aravali
Hills. This region gets scanty rainfall which is less than 150 mm in a year. Hence they climate is arid and
vegetation is scanty. Luni is the only large river but some streams appear during rainy season. Crescentshaped dunes (barchans) abound in this area.
(b) The Central Highlands
Answer: The Central Highlands lies to the north of the Narmada river. It covers the major portion of the
Malwa plateau. The rivers in this region flow from southwest to northeast; which indicates the slope of this
region. It is wider in the west and narrower in the east. Bundelkhand and Baghelkhand mark the eastward
extension of this plateau. The plateau further extends eastwards into the Chhotanagpur plateau.