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NCERT Solutions for Class 11 Geography Chapter 10 Atmospheric Circulation And Weather Systems

by aglasem
August 29, 2021
in 11th Class
Reading Time: 1 min read
0
NCERT Solutions

NCERT Solutions Class 11 Geography Chapter 10 Atmospheric Circulation And Weather Systems– Here are all the NCERT solutions for Class 11 Geography Chapter 10. This solution contains questions, answers, images, explanations of the complete chapter 1 titled  Of Atmospheric Circulation And Weather Systems taught in Class 11. If you are a student of Class 11 who is using NCERT Textbook to study Geography, then you must come across chapter 10 Atmospheric Circulation And Weather Systems After you have studied lesson, you must be looking for answers of its questions. Here you can get complete NCERT Solutions for Class 11 Geography Chapter 10 Atmospheric Circulation And Weather Systems in one place.

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NCERT Solutions Class 11 Geography Chapter 10 Atmospheric Circulation And Weather Systems

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Here on AglaSem Schools, you can access to NCERT Book Solutions in free pdf for Geography for Class 11 so that you can refer them as and when required. The NCERT Solutions to the questions after every unit of NCERT textbooks aimed at helping students solving difficult questions.

For a better understanding of this chapter, you should also see summary of Chapter 10 Atmospheric Circulation And Weather Systems , Geography, Class 11.

Class 11
Subject Geography
Book Fundamentals Of Physical Geography
Chapter Number 10
Chapter Name

Atmospheric Circulation And Weather Systems

NCERT Solutions Class 11 Geography chapter 10 Atmospheric Circulation And Weather Systems

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Class 11, Geography chapter 10, Atmospheric Circulation And Weather Systems solutions are given below in PDF format. You can view them online or download PDF file for future use.

Atmospheric Circulation And Weather Systems Download

NCERT Solutions for Class 11 Geography (Fundamental of physical geography) Chapter 10 Atmospheric Circulation and Weather System Download

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Question & Answer

Q.1: Multiple  choice  questions.
(i) If the surface air pressure is 1,000 mb, the air pressure at 1 km above the surface will be:
(a) 700 mb
(b) 1,100 mb
(c) 900 mb
(d) 1,300 mb
 
(ii) The  Inter  Tropical  Convergence  Zone  normally  occurs:
(a)  near  the  Equator
(b) near the Tropic of Cancer
(c) near the Tropic of Capricorn
(d)  near  the  Arctic  Circle


(iii) The direction of wind around a low pressure in northern hemisphere is:
(a)  clockwise
(b)  perpendicular  to  isobars
(c)  anti-clockwise
(d) parallel to isobars


(iv) Which  one  of  the  following  is  the  source  region  for  the  formation  of  air masses?
(a)  the  Equatorial  forest
(b)  the  Himalayas
(c)  the  Siberian  Plain
(d)  the  Deccan  Plate

Ans : (i) (c) 900 mb (ii) (a) near the Equator (iii) (c) anti-clockwise (iv) (c) the Siberian Plain

Q.2: Answer the following questions in about 30 words.
(i) What is the unit used in measuring pressure? Why is the pressure measured at station level reduced to the sea level in preparation of weather maps?
(ii) While  the  pressure  gradient  force  is  from  north  to  south,  i.e.  from  the subtropical  high  pressure  to  the  equator  in  the  northern  hemisphere, why are the winds north easterlies in the tropics.
(iii) What  are  the  geostrophic  winds?
(iv) Explain the land and sea breezes

Ans : (i) Millibar or Pascal is the unit used in measuring pressure. It is reduced to the sea level in the preparation of weather maps as the gravity of air at the surface is denser and hence has higher pressure. (ii) The Coriolis force acts perpendicular to the pressure gradient force. The pressure gradient force is perpendicular to an isobar. The higher the pressure gradient force, the more is the velocity of the wind and the larger is the deflection in the direction of wind. As a result of these forces operating perpendicular to each other, in the low-pressure areas the wind blows around it. The winds blow from high pressure to the low pressure, so this pressure gradient force is from north to south. Therefore the north easterlies blow from north east to south west. (iii) When isobars are straight and when there is no friction, the pressure gradient force is balanced by the Coriolis force and the resultant wind blows parallel to the isobar. This wind is known as the geostrophic wind. (iv) During the day the land heats up faster and becomes warmer than the sea. Therefore, over the land the air rises giving rise to a low pressure area, whereas the sea is relatively cool and the pressure over sea is relatively high. Thus, pressure gradient from sea to land is created and the wind blows from the sea to the land as the sea breeze. In the night the reversal of conduction takes place. The land loses heat faster and is cooler than the sea.The pressure gradient is from the land to the sea. This is known as land breeze.

Q.3: Answer the following questions in about 150 words.
(i) Discuss the factors affecting the speed and direction of wind.
(ii) Draw  a  simplified  diagram  to  show  the  general  circulation  of  the atmosphere over the globe. What are the possible reasons for the formation of subtropical high pressure over 30 o  N and S latitudes?
(iii) Why  does  tropical  cyclone  originate  over  the  seas?  In  which  part  of  the tropical cyclone do torrential rains and high velocity winds blow and why?

Ans : (i) The speed and direction of the wind is controlled by the combined effects of three forces:

  • Pressure Gradient Force: The differences in atmospheric pressure produces a force. The rate of change of pressure with respect to distance is the pressure gradient. The pressure gradient is strong where the isobars are close to each other and is weak where the isobars are apart.
  • Frictional Force: It affects the speed of the wind. It is greatest at the surface and its influence generally extends upto an elevation of 1 - 3 km. Over the sea surface the friction is minimal.
  • Coriolis Force: The rotation of the earth about its axis affects the direction of the wind. This force is called the Coriolis force after the French physicist who described it in 1844. It deflects the wind to the right direction in the northern hemisphere and to the left in the southern hemisphere.
(ii) The general circulation of the atmosphere also sets in motion the ocean water circulation which influences the earth's climate. The air at the Inter Tropical Convergence Zone (ITCZ) rises because of convection caused by high insolation and a low pressure is created. The winds from the tropics converge at this low pressure zone. The converged air rises along with the convective cell. It reaches the top of the troposphere up to an altitude of 14 km. and moves towards the poles. This causes accumulation of air at about 300 N and S. Part of the accumulated air sinks to the ground and forms a subtropical high. Another reason for sinking is the cooling of air when it reaches 300N and S latitudes. (iii) Tropical cyclones originate and intensify over warm tropical oceans. The conditions favourable for the formation and intensification of tropical storms are: (D Large sea surface with temperature higher than 270 C. (i) Presence of the Coriolis force. (iii) Small variations in the vertical wind speed. (iv) A pre-existing weak low-pressure area or low-level-cyclonic circulation. (v) Upper divergence above the sea level system. The torrential rains and high velocity winds, occur in the region of the 'eye-wall'. The eye is a region of calm with subsiding air. Around the eye is the eye wall, where there is a strong spiralling ascent of air to greater height reaching the tropopause. The wind reaches maximum velocity in this region, reaching as high as 250 km per hour.

NCERT / CBSE Book for Class 11 Geography

You can download the NCERT Book for Class 11 Geography in PDF format for free. Otherwise you can also buy it easily online.

  • Click here for NCERT Book for Class 11 Geography
  • Click here to buy NCERT Book for Class 11 Geography

All NCERT Solutions Class 11

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