NCERT Solutions for Class 9 Social Science Contemporary India Unit 4

Climate Class 9

Unit 4 Climate Exercise Solutions

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Exercise : Solutions of Questions on Page Number : 39

Q1 :  

Choose the right answer from the four alternatives given below.

(i) Which one of the following places receives the highest rainfall in the world?

(a) Silchar

(c) Cherrapunji

(b) Mawsynram

(d) Guwahati

(ii) The wind blowing in the Northern Plains in the summers is known as

(a) Kaal Baisakhi

(c) Trade Winds

(b) Loo

(d) None of the above

(iii) Which one of the following causes rainfall during winters in north-western part of India?

(a) Cyclonic depression

(c) Western disturbances

(b) Retreating monsoon

(d) Southwest monsoon

(iv) Monsoon arrives in India approximately in


Answer :

(i) Which one of the following places receives the highest rainfall in the world?

(a) Silchar

(c) Cherrapunji

(b) Mawsynram

(d) Guwahati

(ii) The wind blowing in the Northern Plains in the summers is known as

(a) Kaal Baisakhi

(c) Trade Winds

(b) Loo

(d) None of the above

(iii) Which one of the following causes rainfall during winters in north-western part of India?

(a) Cyclonic depression

(c) Western disturbances

(b) Retreating monsoon

(d) Southwest monsoon

(iv) Monsoon arrives in India approximately in

(a) Early May

(c) Early June

(b) Early July

(d) Early August

(v) Which one of the following characterises the cold weather season in India?

(a) Warm days and warm nights

(c) Cool days and cold nights

(b) Warm days and cold nights

(d) Cold days and warm nights

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Q2 :  

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?


Answer :

(i) The controls affecting the climate of India are: latitude, altitude, pressure and wind system, distance from the sea, ocean currents and relief features.

(ii) The climate of India is strongly influenced by monsoon winds. Hence, it has a monsoon type of climate.

(iii) The north-western part of India comprising the Indian Desert experiences the highest diurnal range of temperature. This is because of the fact that sand (found in ample quantity in this region) gains and loses heat very quickly. As a result of this phenomenon, there is a wide difference between day and night temperatures in this region. The day temperature may rise to 50°C and drop down to near 15°C the same night.

(iv) The south-west monsoon winds are responsible for rainfall along the Malabar Coast.

(v)Jet streams are a narrow belt of high-altitude winds in the troposphere. The sub-tropical westerly jet stream blowing south of the Himalayas are responsible for the western cyclonic disturbances experienced in the north and north-western parts of the country during the winter months. The sub-tropical easterly jet stream blowing over peninsular India is responsible for the tropical cyclones that affect the eastern coastal regions of India during the monsoon as well as during the October to November period.

(vi) Monsoon refers to the complete reversal of winds over a large area leading to a change of seasons.

“Break” in monsoon refers to the wet and dry spells of the monsoon. In other words, the monsoon rains take place for a few days at a time. They are interspersed with rainless intervals.

(vii) Despite variations in temperature conditions across India, a sense of unity is imposed by the monsoon. The seasonal alteration of the wind systems and the associated weather conditions provide a rhythmic cycle of seasons that binds the entire country.

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Q3 :  

Why does the rainfall decrease from the east to the west in Northern India?


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Q4 :  

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.


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For doing it yourself : Solutions of Questions on Page Number : 40

Q1 :  

In Table-I the average mean monthly temperatures and amounts of rainfall of ten representative stations have been given. It is for you to study on your own and convert them into 'temperature and rainfall' graphs. A glance at these visual representations will help you to grasp instantly the similarities and differences between them. One such graph (Figure 1) is already prepared for you. See if you can arrive at some broad generalisations about our diverse climatic conditions. We hope you are in for a great joy of learning. Do the following activities.

Figure 1: Temperature and Rainfall of Delhi


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Q2 :  

Re-arrange the ten stations in two different sequences:

(i) According to their distance from the equator.

(ii) According to their altitude above mean sea-level.


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Q3 :  

(i) Name two rainiest stations.

(ii) Name two driest stations.

(iii) Two stations with most equable climate.

(iv) Two stations with most extreme climate.

(v) Two stations most influenced by the Arabian branch of southwest monsoons.

(vi) Two stations most influenced by the Bay of Bengal branch of south-west monsoons.

(vii) Two stations influenced by both branches of the south-west monsoons

(viii) Two stations influenced by retreating and north-east monsoons.

(ix) Two stations receiving winter showers from the western disturbances.

(x) The two hottest stations in the months of

(a) February (b) April (c) May (d) June


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Q4 :  

Describe the regional variations in the climatic conditions of India with the help of suitable examples.


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Q5 :  

Discuss the mechanism of monsoons.


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Q6 :  

Give an account of weather conditions and characteristics of the cold season.


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Q7 :  

Give the characteristics and effects of the monsoon rainfall in India.


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Q8 :  

Now find out:

(i) Why are Tiruvanantapuram and Shillong rainier in June than in July?

(ii) Why is July rainier in Mumbai than in Tiruvanantapuram?

(iii) Why are south-west monsoons less rainy in Chennai?

(iv) Why is Shillong rainier than Kolkata?

(v) Why is Kolkata rainier in July than in June unlike Shillong which is rainier in June than in July?

(vi) Why does Delhi receive more rain than Jodhpur?


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Q9 :  

Now think why

- Tiruvananthapuram has equable climate?

- Chennai has more rains only after the fury of monsoon is over in most parts of the country?

- Jodhpur has a hot desert type of climate?

- Leh has moderate precipitation almost throughout the year?

- While in Delhi and Jodhpur most of the rain is confined to nearly three months, in

Tiruvanantapuram and Shillong it is almost nine months of the year?

In spite of these facts see carefully if there are strong evidences to conclude that the monsoons still provide a very strong framework lending overall climatic unity to the whole country.


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Contemporary India - Social Science : CBSE NCERT Exercise Solutions for Class 9th for Climate will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

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