Geography

Heating and cooling of the atmosphere

Q: Why does maximum temperature often occur after the time of maximum solar altitude?

Due to thermal lag net energy gain continues for some time After noon incoming energy can remain greater than outgoing energy for some time. In exams link maximum temperature with energy balance lag.

Q: Under which condition can horizontal cold advection lower temperature faster than local energy balance alone?

When strong wind brings a cold air mass from far away Arrival of a cold air mass can rapidly lower temperature. In exams understand advection as horizontal temperature change.

Q: How can a warm dry westerly wind change temperature and moisture in an area?

It may raise temperature and lower relative humidity Advection of warm dry air can raise temperature and reduce relative humidity. In exams focus on the source region of wind.

Q: By which combined process can dense vegetation reduce local temperature?

Shade and transpiration Trees reduce sunlight and transpiration converts energy into latent heat. In exams treat vegetation as a microclimate regulator.

Q: If surface temperature is much higher than air temperature which process may intensify?

Sensible heat from surface to air and convection A hot surface warms nearby air making it lighter and able to rise. In exams link surface-air temperature difference with convection.

Q: What is the main radiational reason for low daytime temperature over a snow surface?

High albedo Snow has a high albedo, which means it reflects a large fraction of incoming sunlight. Because much of the solar energy is reflected, only a smaller part is absorbed by the snow surface and converted into heat. Consequently, the surface receives less daytime heating and its temperature tends to remain low. Therefore, option B is correct. Low albedo would mean strong absorption and greater warming, while more sensible heat and low reflection contradict what happens on a bright snow surface. The answer follows from the meaning of albedo: it is the proportion of radiation reflected by a surface. Fresh, clean snow is among the most reflective natural surfaces, so its high albedo reduces the net solar energy available for heating. Some energy can still be absorbed, and air temperature also matters, but the principal radiational explanation in the choices is high albedo. Thus, option B gives the correct reason for the relatively low daytime temperature over snow.

Q: Under which condition can vertical air motion near an urban road be stronger at noon?

Black asphalt surface and strong solar absorption Black asphalt absorbs more energy and heats nearby air upward. In exams link low albedo with stronger convection.

In this Class 11 Geography topic, students learn how the atmosphere is heated and cooled through incoming solar radiation and outgoing terrestrial radiation. The lesson explains Earth’s heat balance and the roles of conduction, convection, advection, and latent heat in transferring energy through the atmosphere. Students also examine how land and water surfaces, cloud cover, humidity, and atmospheric circulation influence temperature patterns and help produce differences between places and times.

Expert · Level 4 · 25 questions

Practice questions

01Why does maximum temperature often occur after the time of maximum solar altitude?

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Answer and explanation

Correct answer: A. Due to thermal lag net energy gain continues for some time

After noon incoming energy can remain greater than outgoing energy for some time. In exams link maximum temperature with energy balance lag.

Heating and cooling of the atmosphere

Practice questions

01Why does maximum temperature often occur after the time of maximum solar altitude?किस कारण दोपहर के बाद अधिकतम तापमान अक्सर सौर ऊंचाई के अधिकतम समय से देर से आता है?

02Why is minimum temperature found just before sunrise?सूर्योदय से ठीक पहले न्यूनतम तापमान क्यों मिलता है?

04How can a warm dry westerly wind change temperature and moisture in an area?गर्म शुष्क पछुआ हवा किसी क्षेत्र में तापमान और नमी को कैसे बदल सकती है?

05By which combined process can dense vegetation reduce local temperature?घनी वनस्पति स्थानीय तापमान को किस संयुक्त प्रक्रिया से कम कर सकती है?

07What effect can high dust and aerosol amount have on surface heating during daytime?दिन में धूल और एरोसोल की अधिकता सतह ऊष्मन पर क्या प्रभाव डाल सकती है?

08What is the main radiational reason for low daytime temperature over a snow surface?हिम सतह पर दिन का तापमान कम रहने का मुख्य विकिरणीय कारण क्या है?

09Under which condition can vertical air motion near an urban road be stronger at noon?किस स्थिति में शहरी सड़क के पास दोपहर में ऊर्ध्व वायु गति अधिक तेज हो सकती है?

10Which statement correctly describes the limited but necessary role of conduction?किस कथन में चालकता की सीमित परंतु आवश्यक भूमिका सही बताई गई है?

11What is the correct directional difference between convection and advection?संवहन और अभिवहन में ताप स्थानांतरण की दिशा का सही अंतर क्या है?

12Why can a stable atmospheric layer prevent surface pollution from rising?स्थिर वायुमंडलीय परत सतही प्रदूषण को ऊपर जाने से क्यों रोक सकती है?

13Under which condition will buoyancy of surface air increase most?किस परिस्थिति में सतही वायु का उछाल अधिक बढ़ेगा?

15Why is the day night temperature range very large in deserts?किस कारण रेगिस्तान में दिन और रात का तापांतर बहुत बड़ा होता है?

17Why does water present on a surface regulate temperature through evaporation?किस कारण सतह पर मौजूद जल वाष्पीकरण के माध्यम से तापमान को नियंत्रित करता है?

20Why is water vapour considered a factor with a dual role in temperature control?जलवाष्प को तापमान नियंत्रण में दोहरी भूमिका वाला कारक क्यों माना जाता है?

21Under which condition is frost formation most likely?किस स्थिति में पाला बनने की संभावना सबसे अधिक होगी?

22Why can night temperature near a lake remain higher than over an open dry field?किस कारण किसी झील के पास रात का तापमान खुले सूखे मैदान से अधिक रह सकता है?

23How do surface colour and texture affect local temperature?सतह का रंग और बनावट स्थानीय तापमान को कैसे प्रभावित करते हैं?

25Which sequence best explains cloud formation from a moist surface in afternoon?किस क्रम से दोपहर में नम सतह से बादल बनने की प्रक्रिया सबसे सही समझी जाती है?

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Analytics choices

01Why does maximum temperature often occur after the time of maximum solar altitude?

02Why is minimum temperature found just before sunrise?

04How can a warm dry westerly wind change temperature and moisture in an area?

05By which combined process can dense vegetation reduce local temperature?

07What effect can high dust and aerosol amount have on surface heating during daytime?

08What is the main radiational reason for low daytime temperature over a snow surface?

09Under which condition can vertical air motion near an urban road be stronger at noon?

10Which statement correctly describes the limited but necessary role of conduction?

11What is the correct directional difference between convection and advection?

12Why can a stable atmospheric layer prevent surface pollution from rising?

13Under which condition will buoyancy of surface air increase most?

15Why is the day night temperature range very large in deserts?

17Why does water present on a surface regulate temperature through evaporation?

20Why is water vapour considered a factor with a dual role in temperature control?

21Under which condition is frost formation most likely?

22Why can night temperature near a lake remain higher than over an open dry field?

23How do surface colour and texture affect local temperature?

25Which sequence best explains cloud formation from a moist surface in afternoon?