Discuss the mechanism of monsoons.
Following are the factors responsible for the mechanism of monsoon:
(i) Sun causes the differential heating and cooling of land and water. This creates low pressure on India's landmass and high pressure over the oceanic surface.
(ii) The inter tropical convergence zone (ITCZ) is normally positioned approx 5 N of the equator. It shifts over the ganga plains during the summers which is also called as the monsoon trough during the season of monsoon.
(iii) The high pressure area, east of Madagascar is about 20 S over the indian ocean which affects the Indian monsoon.
(iv) The Tibetan plateau gets intensely heated during the summers which results in strong vertical air currents and formation of high pressure over the plateau. This high pressure zone is approx. 9 km above the sea level . The westerly jet stream moves to the north of the himalayas and the tropical easterly jet stream moves over the Indian peninsula during the summers.
Popular Questions of Class 9 Social Science - Contemporary India
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Write short notes on the following.
(i) The Indian Desert
(ii) The Central Highlands
(iii) The Island groups of India - Q:-
Describe the regional variations in the climatic conditions of India with the help of suitable examples.
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Give reasons as to why.
(i) Seasonal reversal of wind direction takes place over the Indian subcontinent?
(ii) The bulk of rainfall in India is concentrated over a few months.
(iii) The Tamil Nadu coast receives winter rainfall.
(iv) The delta region of the eastern coast is frequently struck by cyclones.
(v) Parts of Rajasthan, Gujarat and the leeward side of the Western Ghats are drought-prone. - Q:-
Why does the rainfall decrease from the east to the west in Northern India.
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Name different types of Vegetation found in India and describe the vegetation of high altitudes.
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The central location of India at the head of the Indian Ocean is considered of great significance. Why?
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Answer the following questions briefly.
(i) What are the controls affecting the climate of India?
(ii) Why does India have a monsoon type of climate?
(iii) Which part of India does experience the highest diurnal range of temperature and why?
(iv) Which winds account for rainfall along the Malabar coast?
(v) What are Jet streams and how do they affect the climate of India?
(vi) Define monsoons. What do you understand by “break” in monsoon?
(vii) Why is the monsoon considered a unifying bond? - Q:-
Give the characteristics and effects of the monsoon rainfall in India.
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Describe how the Himalayas were formed.
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Give an account of weather conditions and characteristics of the cold season.
Recently Viewed Questions of Class 9 Social Science - Contemporary India
- Q:-
Write short notes on the following.
(i) The Indian Desert
(ii) The Central Highlands
(iii) The Island groups of India - Q:-
Describe how the Himalayas were formed.
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Answer the following questions briefly.
(i) What are tectonic plates?
(ii) Which continents of today were part of the Gondwana land?(iii) What is the bhabar?
(iv) Name the three major divisions of the Himalayas from north to south.
(v) Which plateau lies between the Aravali and the Vindhyan ranges?
(vi) Name the island group of India having coral origin. - Q:-
The central location of India at the head of the Indian Ocean is considered of great significance. Why?
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Name different types of Vegetation found in India and describe the vegetation of high altitudes.
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Choose the right answer from the four alternatives given below.
(i) The Tropic of Cancer does not pass through
(a) Rajasthan (c) Chhattisgarh
(b) Orissa (d) Tripura
(ii) The easternmost longitude of India is
(a) 97° 25' E (c) 77° 6' E
(b) 68° 7' E (d) 82° 32' E
(iii) Uttarakhand, Uttar Pradesh, Bihar, West Bengal and Sikkim have common frontiers with
(a) China (c) Nepal
(b) Bhutan (d) Myanmar
(iv) If you intend to visit Kavarati during your summer vacations, which one of the following Union Territories of India you will be going to
(a) Puducherry (c) Andaman and Nicobar
(b) Lakshadweep (d) Diu and Daman
(v) My friend hails from a country which does not share land boundary with India. Identify the country.
(a) Bhutan (c) Bangladesh
(b) Tajikistan (d) Nepal - Q:-
Distinguish between population growth and population change.
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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 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) Mahanadi (c) Krishna
(b) Tungabhadra (d) Tapi - Q:-
(i) Migrations change the number, distribution and composition of the population in
(a) the area of departure (c) both the area of departure and arrival
(b) the area of arrival (d) none of the above
(ii) A large proportion of children in a population is a result of
(a) high birth rates (c) high death rates
(b) high life expectancies (d) more married couples
(iii) The magnitude of population growth refers to
(a) the total population of an area
(b) the number of persons added each year
(c) the rate at which the population increases
(d) the number of females per thousand males
(iv) According to the Census 2001, a “literate” person is one who
(a) can read and write his/her name
(b) can read and write any language
(c) is 7 years old and can read and write any language with understanding
(d) knows the 3 ‘R’s (reading, writing, arithmetic) - Q:-
Answer the following questions briefly.
(i) Name the group of islands lying in the Arabian sea.
(ii) Name the countries which are larger than India.
(iii) Which island group of India lies to its south-east?
(iv) Which island countries are our southern neighbours?
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