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Tuesday, December 1, 2020

In Search of the Source of Wind Summary, Notes, Question & Answers PDF Download

Download In search of the Source of Wind Questions and Answers, Summary, Activity, Notes, Kerala Syllabus 10th Standard Social Science Solutions Part 2 Chapter 2 help you to revise complete Syllabus and score more marks in your examinations.

 കാറ്റിന്റെ ഉറവിടം തേടി | In Search of the Source of Wind Malayalam PDF Download

ഇന്ത്യയുടെ ചരിത്രഗതിയെ മാറ്റിമറിച്ച വാസ്കൊ ഡ ഗാമ എന്ന നാവികൻ കാറ്റിന്റെ കൈകളിലേറി ഇന്ത്യയിലെത്തിയ വിവരണത്തിൽ കുട്ടികളുടെ ശ്രദ്ധ ആകർഷിച്ചാണ് ഈ യൂണിറ്റ് ആരംഭിക്കുന്നത്. അന്തരീക്ഷ വായുവിന്റെ ഭാരമാണ് അന്തരീക്ഷമർദ്ദമെന്നും, 

അന്തരീക്ഷമർദ്ദത്തിലുണ്ടാകുന്ന വ്യതിയാനങ്ങളാണ് കാറ്റുകൾക്ക് അടിസ്ഥാന കാരണമെന്നുമുള്ള മുന്നറിവ് പരിശോധിച്ച് അന്തരീക്ഷമർദ്ദവ്യതിയാനങ്ങൾക്കുള്ള കാരണങ്ങൾ ചിത്ര വിശകലനത്തിലൂടെ കണ്ടെത്തി വ്യത്യസ്ത പ്രദേശങ്ങളിലെ അന്തരീക്ഷ മർദ്ദം ബരോ മീറ്റർ ഉപയോഗിച്ച് കണ്ടെത്തി മാപ്പിൽ അടയാളപ്പെടുത്തി, ഒരേ മർദ്ദമുള്ള സ്ഥലങ്ങളെ തമ്മിൽ ബന്ധിപ്പിച്ച് സമമർദ്ദരേഖകൾ വരച്ച് ഭൂമിയിലെ മർദ്ദമേഖലകൾ കണ്ടെത്തി, വരച്ച്,അതുണ്ടാകാനുള്ള കാരണങ്ങൾ പരിശോധിച്ച് വിവരണം തയ്യാറാക്കുകയാണ്.

ഉച്ചമർദ്ദമേഖലയിൽ നിന്നും ന്യൂനമർദ്ദമേഖലയിലേക്കുള്ള വായുവിന്റെ തിരശ്ചീന ചലനമാണ് കാറ്റെന്ന് മനസ്സിലാക്കി, കാറ്റുകൾക്ക് പേര് നൽകി, കാറ്റിന്റെ വേഗതയേയും ദിശയേയും സ്വാധീനിക്കുന്ന ഘടകങ്ങൾ തിരിച്ചറിഞ്ഞ്, ടോറി സെല്ലി, കോറിയോലിസ്, ഫെറൽ എന്നിവരെ പരിചയപ്പെട്ട് വിവിധ തരം കാറ്റുകളെ പരിചയപ്പെടുകയാണ്. ആഗോള വാതങ്ങൾ, കാലികവാതങ്ങൾ, പ്രാദേശിക വാതങ്ങൾ എന്നിങ്ങനെയുള്ള കാറ്റുകളെ തിരിച്ചറിഞ്ഞ്, പട്ടികകൾ - ഫ്ലൊചാർട്ടുകൾ, കുറിപ്പുകൾ എന്നിവ തയ്യാറാക്കിയാണ് അനിമേഷന്റെ സഹായത്തോടെ തയ്യാറാക്കി ഈ പ്രസന്റേഷൻ അവസാനിക്കുന്നത്. നോട്ടുകൾ തയ്യാറാക്കാൻ pdf ഉം ഉപകാരപ്പെടും. അതുപോലെ 3 വീഡിയോയിലൂടെ ക്ലാസ്സ് പ്രക്രിയാ ബന്ധിതമായി കൊണ്ടുപോകാനും നേരിട്ട് അനുഭവങ്ങൾ നൽകാനും സാധിക്കും.

In Search of the Source of Wind Notes PDF Download


More Questions and Answers from In search of the Source of Wind

 
1. Why are Polar easterlies called so? 
The polar winds are the cold winds that blow from the high-pressure areas towards the sub-polar low pressure belts. These winds blow from the east in both hemispheres due to the Coriolis force. Hence these are known as Polar easterlies.


2. When temperature increases atmospheric pressure decreases, when temperature decreases atmospheric pressure increases. Why? 
Like any other matter, air also expands when it gets heated. The expanded air is less dense and hence it ascends. This leads to the lowering of atmospheric pressure. The ascending air spreads to the sides and cools. On cooling, it becomes dense and descends. As a result the atmospheric pressure increases. 


3. Which are the major local winds that are blown in India. 
$ Loo       
$  Mangoshowers  
$  Kalbaisakhi


4.  Monsoon doesn’t occur in the Northern European region. Why? 
The formation of the Monsoon winds happens only when the sun’s rays fall vertically from equator to Tropic of Cancer and to Tropic of Capricorn. Another important factor is the unproportional heating and cooling of the land and the sea. The North European zone locates near the Arctic zone. Therefore the availability of sun’s heat is very low. Because of this, monsoon does not occur in this area.


5. Why did monsoon winds cause trouble to Gama on his return to Malindi?
The south west monsoon gave a great help to Vasco da Gama in his arrival to India. His voyage was mainly depended on the favourable direction of the monsoon winds. But Gama tried to utilise the same wind for his return voyage to Portugal. But the direction of the south west monsoon was quite against his route. So his voyage to Malindi became too difficult.


6. How do friction affect the speed of wind?
The speed of wind will be high over ocean surfaces and level lands as the friction is less. On the other hand, as the friction being more along difficult terrains and places with dense forest cover, the  speed of wind will be less in those places. 


7. Given below are some of the chara- cteristics of Global winds. Identify each of them are related to which Global winds.
Answer:    a.   Westerlies
 b.   Polar winds    c.  Trade winds

8. How does the altitude, temperature and humidity influences atmospheric pressure?
Altitude : The atmospheric pressure decreases with altitude. The pressure decreases at the rate of 1 millibar (mb) per an altitude of 10 meters. The ratification of air with altitude is the reason for this decrease in atmospheric pressure. The ratification of air with altitude is the reason for this decrease in atmospheric pressure. The atmospheric pressure and the altitude are inversely proportional.
       Temperature : Air expands when it gets heated. The expanded air is less dense and hence it ascends. This leads to the lowering of atmospheric pressure. The ascending air spreads to the sides and cools. On cooling, it becomes dense and descends. As a result the atmospheric pressure increases. 
 
Humidity :  Humidity refers to the quantity of water present in the atmosphere. Water vapour is lighter than air and hence it ascends. If the quantity of water vapour is more in a unit volume of air, then naturally the atmospheric pressure will be less. Humidity and atmospheric pressure are inversely proportional. 

9. Which local wind is known as ‘Snow-eater’. Why is it called so?
Chinook is a local wind that blows down the eastern slope of the Rockie mountains in North America. As a result of these winds, the snow along the eastern slopes of the Rockies melts, away. The term Chinook means ‘snow eater’ a term that suits to its peculiarity.

10. The speed of wind will be high over ocean surfaces and level lands. Why?
The speed of wind will be high over ocean surfaces and level lands as the friction is less. On the other hand, the friction being more along difficult terrains, the speed of wind will be less.

11. Arrange the items in B and C columns suitable to column A.

12. Which wind is known as Roaring Forties from the following.
(a. Polar Easterlies.        b. Westerlies.  
 C. Monsoon winds.       d. Trade winds)
Ans: Westerlies

 
13. (i) Name the smooth lines in the diagram.
(ii) Among the places A and B, identify the place experiencing high pressure and the place experiencing low pressure.
(iii) The sun is in which hemisphere during the period?
Answer: i.  Isobars
           ii.  A- Low pressure, B- High pressure.
           iii.  Sun is in Northern hemisphere.
 
 
 
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