Ocean currents<\/li>\n<\/ul>\n(iii) In India, why is the day temperature maximum in May and why not after summer solstice? \nAnswer: \nBecause in May, the North Pole is inclined 23’A\u00b0 toward the sun. As a result, the sun\u2019s rays are vertical at noon over Tropic of Cancer. The sun is always above the horizon throughout the day north of 66!\/2\u00b0N. So the North polar region experiences six months of sunlight in the summer. The northern hemisphere has longer day hours in summer.<\/p>\n
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(iv) Why is the annual range of temperature high in the Siberian plains? \nAnswer: \nAnnual range of temperature is the difference between the mean temperature of the hottest month and the mean temperature of the coldest month.<\/p>\n
It is much pronounced in Siberian plain. The mean January temperature along 60\u00b0E longitude is – 20\u00b0C both at 80\u00b0N and 50\u00b0N latitudes. The mean monthly January temperature is over 27\u00b0C in equatorial oceans, over 24\u00b0C in the tropics, and 2\u00b0C to 0\u00b0 in middle latitudes and -18\u00b0C to -48\u00b0C in Eurasian continental interior.<\/p>\n
Question 3. \nAnswer the following questions in about 150 words each :<\/p>\n
(i) How do the latitude and the tilt in the axis of rotation of the earth affect the amount of radiation received at the surface. \nAnswer: \nThe latitude determines the angle of inclination of solar rays. At the equator, the solar rays are nearly vertical and their inclination decreases towards the poles. Between the Tropic of Cancer 23 \u2018\/2\u00b0N and the Tropic of Capricorn (23’\/2\u00b0S), the solar rays fall vertically twice a year. On any day the inclination of solar rays decreases away from the latitude where the sun is overhead at noon.<\/p>\n
Another factor that determines the amount of insolation received at a place is the length of the day. The variation in day length in a year is caused by the tilt of axis of rotation of earth and the revolution of the earth around the sun. The axis of rotation of earth is inclined about 66V20 from the plane of ecliptic.<\/p>\n
On March 21st and September 23rd, the sun is overhead at noon over the equator. On these dates the days are 12 hours long all over the world.<\/p>\n
On about June 21st, the North pole is inclined 23’A0 towards the sun. As a result, the sun\u2019s rays are vertical at noon over the Tropic of Cancer.<\/p>\n
On about December 21st, sun\u2019s rays are vertical over Tropic of Capricorn. The southern hemisphere experiences longer day hours and northern hemisphere experiences shorter day duration.<\/p>\n
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(ii) Discuss the processes through which the earth atmosphere system maintains heat balance. \nAnswer: \nThere are variations in the amount of radiation received at the earth\u2019s surface caused by variation in angle of incidence of sun\u2019s rays, the length of the day and presence of clouds. In the net result, some part of the earth has surplus radiation balance and some other part has deficit radiation balance in the surface atmosphere.<\/p>\n
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The mean annual temperature of the earth as a whole remains the same. But balance between incoming and outgoing radiation is not uniform and varies from latitude to latitude. In the low latitudes (between 40\u00b0N and 40\u00b0S) heat gained by shortwave radiation is far more than the heat lost by long wave through the earth\u2019s radiation. While in the higher latitudes, more heat is lost by outgoing long wave than received in short waves.<\/p>\n
(iii) Compare the global distribution of temperature in January over the northern and the southern hemisphere of the earth. \nAnswer: \nThe global distribution of temperature is generaly shown on the map as isotherms. The deviation from this general trend is more pronounced in January than in July, especially in the northern hemisphere. In the northern hemisphere, the land surface area is much larger than in the southern hemisphere.<\/p>\n
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Hence, the effects of landmass and the ocean currents are well pronounced. In January the isotherms deviate to the north over the ocean and to south over the continent. The pressure of warm ocean currents, gulf stream and North Atlantic drift make the Northern Atlantic warmer and the isotherms bend towards the north. Temperature decreases over the land and the isotherms bend towards south in Eurasian continent. \n \n \n \n <\/p>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
Detailed, Step-by-Step NCERT Solutions for Class 11 Geography Chapter 9\u00a0Solar Radiation, Heat Balance and Temperature Questions and Answers were solved by Expert Teachers as per NCERT (CBSE) Book guidelines covering each topic in chapter to ensure complete preparation. Solar Radiation, Heat Balance and Temperature NCERT Solutions for Class 11 Geography Chapter 9 Solar Radiation, Heat …<\/p>\n
NCERT Solutions for Class 11 Geography Chapter 9 Solar Radiation, Heat Balance and Temperature<\/span> Read More »<\/a><\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","spay_email":""},"categories":[4],"tags":[],"yoast_head":"\nNCERT Solutions for Class 11 Geography Chapter 9 Solar Radiation, Heat Balance and Temperature - MCQ Questions<\/title>\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\t \n\t \n\t \n