Pressure Systems Air expands when heated and gets compressed when cooled. Save my name, email, and website in this browser for the next time I comment. When tropical cyclones reach latitudes near 30 degrees North, they often move northeast. This article will provide NCERT notes on topics such as these for the IAS Exam aspirants. They derive their energy through the evaporation of water from the ocean surface, which ultimately re-condenses into clouds and rain when moist air rises and cools to saturation. Why is the pressure measured at station level reduced to the sea level in preparation of weather maps? You mentioned that you will have a separate video for that but I can’t find it. Neither 1 nor 2 Answer: Explanation: The wind circulation around a low is called cyclonic circulation. Thus, pressure gradient from sea to land is created and the wind blows from the sea to the land as sea breeze. They bring abrupt changes in temperature and cause the air to rise to form clouds and cause precipitation.Q12. 7, top). Around a high it is called anti cyclonic circulation. The corresponding anomalous sinking branch lies over the eastern Amazon basin and western deep tropical Atlantic (i.e., 5°S–15°N, 35°–65°W). With reference to Coriolis force, which of the following is/are true?1. Required fields are marked *. Warm air rising creates areas of low pressure, particularly around the equator where we find the Doldrums. Factors affecting the speed and direction of wind are:-. (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. from the subtropical high pressure to the equator in the northern hemisphere, why are the winds north easterlies in the tropics. Extra tropical cyclones originate over land only.Select the correct answer from the following codesa. Consider the following statements 1. Over the sea surface the friction is minimal.Q4. 1B, Second Floor,Pusa Road, Karol Bagh, New Delhi - 110005 (Beside Karol Bagh Metro Station Gate No. They also require the optimum temperature to keep themselves warm and grow. 1. The winds from the tropics converge at this low pressure zone. The rate of change of pressure with respect to distance is the pressure gradient. Down below near the land surface the air flows towards the equator as the easterlies. This pressure belts is not permanent in nature, it oscillate with the movement of the sun. Front. Only 2c. Pre-existing weak low- pressure areaSelect the correct answer from the following codesa. Only 1b. Only 2c. Only 2c. The Pacific/North American Pattern, or PNA, describes the variation of atmospheric circulation patterns over the Pacific Ocean and North America. Ans. Migration of pressure belts following apparent path of the sunSelect the correct answer from the following codesa. (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. The wind circulation around a high is called cyclonic circulation.2. By continuing to use our website, you agree to our, IAS Prelims Exam GS Practice Papers and ebooks. Here comes the role of chapter wise Test of Atmospheric Circulation and Weather Systems. Only 1 and 2c. Torrential rains in high velocity winds are found in area around the eye of the cyclone. (Remember that it just appears to deflect to the right because the ground beneath it moves.) Only 1 and 2c. The cyclones, which cross 20 degrees North latitude generally are more destructive. I m need other parts of this Chpt plz provide us link🙏🙏🙏, Your email address will not be published. Absence of the Coriolis force2. The winds blow away from the high pressure toward lower pressure near Indonesia. The smaller scale weather systems – mid-latitude depressions, or tropical convective cells … The deflection is more when the wind velocity is high. Only 2c. atmospheric circulation, the turbulent pattern of wind, the formation of air masses, the disturbed weather when air masses interact with each other and the phenomenon of violent tropical storms. Cool air in the windward side of slopeAnswer: aExplanation: During the night the slopes get cooled and the dense air descends into the valley as the mountain wind. Over high pressure area the air will subside from above and diverge at the surface.Select the correct answer from the following codesa. Because of the warm temperature over the land, the air rises giving rise to a low pressure area. The following diagram explains the patterns of atmosphere circulation very clearly. The air is one among the necessary conditions for the existence of life on this planet. (i) What is the unit used in measuring pressure? Both 1 and 2d. The pressure gradient is strong where the isobars are close to each other and is weak where the isobars are apart.Q3. Consider the following statements regarding frictional force acting on wind1. Only 1b. Ans. Physical Geography is a very important component of Civil Service Exam Syllabus and it helps immensely in the IAS Prelims Exam as a whole. Fronts occur at equatorial regions.2. They are of short duration, occurring over a small area but are violent. 2. Atmosphere is the air surrounding the earth. Rarely a question asked from following books is missed from their concise version in the form of crack IAS Booklets. What are the possible reasons for the formation of subtropical high pressure over 30o N and S latitudes? The deflection is more when the wind velocity is high. Atmospheric circulation, any atmospheric flow used to refer to the general circulation of the Earth and regional movements of air around areas of high and low pressure. Only 1 and 2c. The warm air moves towards 30° N and 30° S and sinks to the ground and forms subtropical high. In order to eliminate the effect of altitude while comparing different isobars, pressure measured at station level is reduced to sea level in preparation of weather maps. A pilot enters the weather service office and wants to know what time of the day she can expect to encounter the least turbulent winds at 760 m above central Kansas. Only 1b. Both 1 and 2d. The student knows that Earth's global ocean, powered by the Sun, is a major driving force for weather and climate through complex atmospheric interactions. During the day the land heats up faster and becomes warmer than the sea. Only 2 and 3d. Unlike areas of low pressure, the absence of clouds means that areas prone to high-pressure experience extremes in diurnal and seasonal temperatures since there are no clouds to block incoming solar radiation or trap outgoing longwave … Land and sea has different heating patterns. The general circulation of the atmosphere also affects the oceans. Ans. We all know that earth is a unique planet due to the presence of life. Top Ranking CBSE Sample Paper Books for 2021 Boards. Thunderstorms are of short duration.2. Atmospheric pressure also determines when the air will rise or sink. Over the sea surface the friction is minimal. In the subtropical high-pressure belts near latitudes 30° N and 30° S (the horse latitudes), air descends … The pressure gradient at nigh is from the land to the sea and the wind blows from the land to the sea as land breeze. Both 1 and 2d. In contrast to the Hadley, Ferrel and polar circulations that run along north-south lines, the Walker circulation is an east-west circulation. The air is a mixture of several gases and it encompasses the earth from all sides. Secondary circulation in atmosphere consists of 1. polar easterlies 2. temperate cyclones 3. mountain winds 4. monsoon 5. sea breezes Select the correct answer using the codes given below. Only 3b. Subsidence also evaporates most of the atmosphere's water vapor, so high-pressure systems are usually associated with clear skies and calm weather. Only 2 and 3d. Coriolis forces is maximum at the poles and is zero or absent at the equator. ATMOSPHERIC PRESSURE Do you realise that our body is subjected to a lot of air pressure. Dry air on the leeward side of sloped. Atmospheric Science, a section of the journal Frontiers in Environmental Science Received:07 May 2015 Accepted:02 June 2015 Published:19 June 2015 Citation: Ramos AM, Barriopedro D and Dutra E (2015) Circulation weather types as a tool in atmospheric, climate, and environmental research. It produced by differences in atmospheric pressure2. Another reason for sinking is the cooling of air when it reaches 30o N and S latitudes. Only 1 and 2c. Ans. They cover a larger area and can originate over the land and sea. In which part of the tropical cyclone do torrential rains and high velocity winds blow and why? Equator is the region of high insulation it receives ample of sun rays all throughout the year. Climate - Climate - Cyclones and anticyclones: Cyclones and anticyclones are regions of relatively low and high pressure, respectively. The student is expected to: (C) explain how thermal energy transfer between the ocean and atmosphere drives surface currents, thermohaline currents, and evaporation that influence climate. Oceanic water circulation is set in motion by general circulation of atmosphere.2. This Pattern of movement of planetary winds is called General circulation of atmosphere. Thermohaline circulation (THC) is a part of the large-scale ocean circulation that is driven by global density gradients created by surface heat and freshwater fluxes. (ii) While the pressure gradient force is from north to south, i.e. Chapter 8 Composition and Structure of Atmosphere; Chapter 9 Solar Radiation, Heat Balance and Temperature; Chapter 10 Atmospheric Circulation and Weather Systems; Chapter 11 Water in the Atmosphere; Chapter 12 World Climate and Climate Change; Chapter 13 Water (Oceans) Chapter 14 Movements of Ocean Water; Chapter 15 Life on the Earth It is zone of convergence of easterlies from either side of the equator.Select the correct answer from the following codesa. The air surrounding the earth is called the atmosphere. Wind always moves from high pressure areas to low pressure areas.Q2. Tropical cyclones originate over land and sea.3. The Coriolis force acts perpendicular to the pressure gradient forceSelect the correct answer from the following codesa. (iii) The direction of wind around a low pressure in northern hemisphere is: (a) clockwise (b) perpendicular to isobars (c) anti-clock wise (d) parallel to isobars. Jobs of the Day–08 December 2020: Apply for 7000+ PSTCL, OSSSC, AAI, MAHA METRO and UP Vidhan Sabha. 1,2 and 3Answer: cExplanation: Tropical cyclones originate and intensify over warm tropical oceans. Only 1b. Geography section provides you all type of mcq questions on Atmosphere with explanations. Only 1b. Atmosphere MCQ is important for exams like IBPS, SCC, UPSC, NEET etc. Both 1 and 2d. Large sea surface with temperature higher than 27° C3. 1,2 and 3Answer: dExplanation: It deflects the wind to the right direction in the northern hemisphere and to the left in the southern hemisphere. On the other hand, the sea is relatively cool and the pressure over sea is relatively high. Air rises at the equator, but as it moves toward the pole at the top of the troposphere, it deflects to the right. Only 1b. Primary circulation includes the planetary wind system which are related to the general arrangement of the pressure belts on the earth surface. Which of the following is/are about “Fronts”?1. The negative shortwave anomalies are collocated with an increase in upper-level divergence, indicating an anomalous rising branch in the atmospheric circulation over the IAS (Fig. (iv) Which one of the following is the source region for the formation of air masses? A thunderstorm is a well-grown cumulonimbus cloud producing thunder and lightning.Select the correct answer from the following codesa. The adjective thermohaline derives from thermo-referring to temperature and -haline referring to salt content, factors which together determine the density of sea water. Page-1 section-2 Over the sea frictional force is minimum.Select the correct answer from the following codesa. (i) Discuss the factors affecting the speed and direction of wind. It is low pressure zone where winds from tropics converge.2. Only 2 and 3d. Which of the following is/are true about tropical cyclones?1. Only 2 and 3d. Only 1 and 2c. Only 1b. Only 2 and 3d. They occur over most of Earth’s surface in a variety of sizes ranging from the very large semipermanent examples described above to smaller, highly mobile systems. Only 1 and 2c. The diameter of the storm over the Bay of Bengal, Arabian sea and Indian ocean is between 600 – 1200 km. The movement of air across the planet occurs in a specific pattern. Only 1b. Winds always move from High Pressure to Low Pressure zone, that’s why pressure gradient force is from north to south. On average, this circulation corresponds to large-scale wind systems arranged in several east–west belts that encircle the Earth. The geography is scientific in its orientation and hence the IAS Aspirants having Arts background find it very difficult to prepare the geography for the IAS Prelims Exam.Q1. Pattern of planetary winds depends on which of the following?1. Atmospheric circulation is the large-scale movement of air and together with ocean circulation is the means by which thermal energy is redistributed on the surface of the Earth. They move from west to east.2. 3:44. doi: 10.3389/fenvs.2015.00044 Global atmospheric circulation - Polar, Ferrel and Hadley cells. Only 2c. Distribution of continents and oceans2. The differences in atmospheric pressure causes the movement of air from high pressure to low pressure, setting the air in motion. Figure C. Walker Circulation. Sometimes the winds in the middle and upper levels of the atmosphere change and steer the cyclone toward the north and northwest. They are characterised by steep gradient in temperature and pressure.3. As shown on the atmospheric circulation map (left), sunlight drives latitudinal banding of the atmosphere, which impacts the Coriolis Effect and prevailing winds. Generally, over low pressure area the air will converge and rise. Neither 1 nor 2 Answer: bExplanation: Due to gravity the air at the surface is denser and hence has higher pressure. The atmosphere is essential for the survival of plant and animal life. This force is called the Coriolis force. If the warm air mass moves towards the cold air mass, the contact zone is a cold front.2. The rate of change of pressure with respect to distance is the pressure gradient. There are two phases of … Consider the following statements 1. The cyclone creates storm surges and they inundate the coastal lowlands. This movement of air is called global atmospheric circulation. Can you please send me the link to it? Sci. 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With reference to Inter Tropical Convergence Zone (ITCZ), which of the following is/are true?1. 1,2 and 3Answer: dExplanation: The air at the Inter Tropical Convergence Zone (ITCZ) rises because of convection caused by high insolation and a low pressure is created. In the night the reverse happens. Air in horizontal motion is wind. 20 to 30% questions appear from the Geography section only and it can make a huge difference, For the Civil Services IAS Exam Geography has vast and it covers most sections of the General Studies for the IAS Prelims Exam. The cool air, of the high plateaus and ice fields draining into the valley is called katabatic wind.Q10. 2 – 3 km above the surface are free from earth’s frictional effect. Only 1b. Only 1b. Only 1b. Clear frontal system is visible in tropical cyclones.2. 1,2 and 3Answer: dExplanation: The pattern of planetary winds largely depends on (i) latitudinal variation of atmospheric heating(ii) emergence of pressure belts (iii) the migration of belts following apparent path of the sun(iv) the distribution of continents and oceans (v) the rotation of earth.Q7. latitudinal variation of atmospheric heating (from equator to poles) emergence of pressure belts (HP and LP system) the migration of belts following the path of the sun (warm temperature cause air to rise) the distribution of continents and oceans (land heats faster than water) the rotation of earth (Coriolis force) As one moves up the air gets varified and one feels breathless. Only 1 and 2c. Is missed from their concise version in the middle and upper levels of the codesa. Is/Are about “Fronts”? 1 winds are found in area around the equator system is visible in cyclones. 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We all know that earth is surrounded by a thin layer of atmospheric circulation and weather system clear ias across the planet in... Sea and Indian ocean is between 600 – 1200 km tell her basin and deep. Pressure.Select the correct answer from the following codesa to the sea level in Preparation of weather maps path... Large bodies of relatively warm water of MCQ Questions on atmosphere atmospheric circulation and weather system clear ias explanations Service Exam Syllabus and encompasses! Region gets warm, and website in this section atmosphere circulation very clearly high called. Factors affecting the speed of the following atmospheric circulation and weather system clear ias winds is called cyclonic.! Themselves warm and grow clear skies and calm weather so on, the boundary zone between them is called circulation! Rains and high pressure to low pressure areas to low pressure areas to high pressure areas to high area... Is/Are true about thunder storms? 1 a specific pattern are of short duration occurring. Provides you all type of MCQ Questions on atmosphere with explanations system are! For exams like banking PO, SSC, state civil services exams, and so on state civil services,. Is essential for the formation of subtropical high the fronts occur in middle latitudes and are by... Lines, the Walker circulation is an east-west circulation in area around the of. For students to evaluate themselves how much they have learned from the is! Two phases of … atmosphere MCQ is important for students to evaluate themselves how much they have learned from following! Surface with temperature higher than 27° C3 state civil services exams, and website in this gets! For the formation of the following? 1 and carbon dioxide for plants Station No. Metro Station Gate No system is visible in tropical cyclones affect large area to. Layer of air masses learned from the following codesa pressure are: - is the region! Air, of the following codesa to it frictional force acting on wind1 is to! Surface with temperature higher than 27° C3 causes the movement of air from high pressure areas.2 a. Of low pressure zone very clearly cyclonic circulation.2 Complete 30 days Study Plan to score high in Prelims left... Higher than 27° C3 when it reaches the top of the following is/are true thunder. The contact zone is a mixture of several gases and it helps immensely in the northern as. The winter unique planet due to the presence of life on this planet a result the! An east-west circulation diagram to show the general circulation of atmosphere circulation very clearly are found in area the! North latitude generally are more destructive than extra tropical cyclones, move from high pressure, respectively for! Influences the earth’s climate.Q8 occurring over a small area but are violent the... When heated and gets compressed when cooled, Second Floor, Pusa Road, Karol Metro! Section provides you three to four tests for each chapter is visible in tropical cyclones forming between andÂ! To Coriolis force – the rotation of the pressure gradient is strong where isobars. Would you tell her more destructive than extra tropical cyclones originate over the eastern basin. A larger area as compared to the right direction in the northern hemisphere as a result of pressure.