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NCERT Solutions

Atmospheric Circulation and Weather Systems

Madhya Pradesh Board · Class 11 · Geography

NCERT Solutions for Atmospheric Circulation and Weather Systems — Madhya Pradesh Board Class 11 Geography.

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EXERCISES

1(i)If the surface air pressure is 1,000 mb, the air pressure at 1 km above the surface will be:Show solution
From the table, pressure decreases by about 1 mb for each 10 m rise in height in the lower atmosphere. At 1 km = 1000 m, the decrease is about 100 mb. So, if surface pressure is 1000 mb, the pressure at 1 km is:

1000−100=9001000 - 100 = 900 mb

So the correct option is (c) 900 mb.

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1(ii)The Inter Tropical Convergence Zone normally occurs:Show solution
The Inter Tropical Convergence Zone (ITCZ) is the low-pressure belt where the trade winds from both hemispheres converge. It normally occurs near the Equator.

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1(iii)The direction of wind around a low pressure in northern hemisphere is:Show solution
In the Northern Hemisphere, winds around a low-pressure system circulate in an anticlockwise direction due to the Coriolis force.

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1(iv)Which one of the following is the source region for the formation of air masses?Show solution
Air masses form over homogeneous source regions such as vast plains or oceans. Among the given options, the Siberian Plain is the suitable source region for air-mass formation.

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2(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?Show solution
The unit used to measure atmospheric pressure is millibar (mb). Pressure measured at a station is reduced to sea level so that places at different heights can be compared fairly on weather maps, because pressure decreases with height.

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2(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.Show solution
Although the pressure gradient force acts from the subtropical high towards the equator, the winds in the tropics become north-easterlies because the Coriolis force deflects moving air to the right in the Northern Hemisphere. So the air moving southward is turned toward the west, producing north-easterly trade winds.

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2(iii)What are the geotrophic winds?Show solution
Geostrophic winds are winds in the upper atmosphere where friction is negligible and the pressure gradient force is balanced by the Coriolis force. As a result, the wind blows parallel to the isobars.

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2(iv)Explain the land and sea breezes.
3(i)Discuss the factors affecting the speed and direction of wind.
3(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° N and S latitudes?
3(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?
(i)Collect weather information over media such as newspaper, TV and radio for understanding the weather systems.
(ii)Read the section on weather in any newspaper, preferably, one having a map showing a satellite picture. Mark the area of cloudiness. Attempt to infer the atmospheric circulation from the distribution of clouds. Compare the forecast given in the newspaper with the TV coverage, if you have access to TV. Estimate, how many days in a week was the forecast were accurate.

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Frequently Asked Questions

What are the important topics in Atmospheric Circulation and Weather Systems for Madhya Pradesh Board Class 11 Geography?
Atmospheric Circulation and Weather Systems covers several key topics that are frequently asked in Madhya Pradesh Board Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Atmospheric Circulation and Weather Systems — Madhya Pradesh Board Class 11 Geography?
Understand the core concepts first, then work through the 65 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
Where can I get free NCERT Solutions for Atmospheric Circulation and Weather Systems Class 11 Geography?
This page has free step-by-step NCERT Solutions for every exercise question in Atmospheric Circulation and Weather Systems (Madhya Pradesh Board Class 11 Geography) — written the way examiners award marks: given, formula, working, answer.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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