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Subjects

Geography

Insolation and factors affecting it

In Class 11 Geography, this topic explains insolation—the incoming solar radiation received by Earth—and its role in the chapter Solar Radiation, Heat Balance, and Temperature. Students learn how the angle of the Sun’s rays, duration of daylight, latitude, season, Earth–Sun distance, and atmospheric conditions affect the amount of energy reaching different places. The topic also helps them understand why heating varies across Earth’s surface and how these variations influence temperature patterns and the broader heat balance.

Expert · Level 5 · 25 questions

Practice questions

01In which condition does the same amount of solar energy concentrate on the smallest area and produce greater heating?

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Answer and explanation

02Why does less heat reach the surface at high latitudes due to oblique rays?

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03If two places have equally clear skies but one has a higher solar altitude, how will insolation there be?

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04Why is the effect of annual Earth-Sun distance change on insolation limited?

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05Why does the Northern Hemisphere have winter in January even though Earth is near the Sun?

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06Which pair would reduce surface insolation the most?

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07Why is surface insolation often high during daytime in deserts due to clear skies?

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08If a place has long daylight but a very low solar angle, how should total insolation be evaluated?

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09Why is surface heating not extremely high in polar summer despite long daylight?

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10What happens to absorbed insolation at the surface when albedo is high?

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11Between a dark rocky surface and fresh snow receiving equal solar radiation, which will absorb more energy?

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12Through which process does greater atmospheric thickness reduce insolation reaching the surface?

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13Why can south-facing slopes receive more insolation in the Northern Hemisphere?

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14Under which condition can a slope receive more effective insolation than a flat plain?

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15Why can direct solar radiation be higher at high altitude under clear skies?

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16What is the main reason surface insolation decreases even at noon during dense monsoon clouds?

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17If aerosols and dust suddenly increase in an area, what happens to direct insolation?

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18Why does annual insolation remain relatively more stable at the equator?

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19What combined reason explains high insolation near the Tropic of Cancer during the June solstice?

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20What is the main astronomical reason for higher seasonal insolation in the Southern Hemisphere in December?

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21Which statement best describes global insolation distribution on equinox days?

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22Which relationship is more suitable for intensity of insolation?

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23Which option lists only factors that reduce insolation?

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24After solar radiation enters the atmosphere, which processes change its quantity before it reaches the surface?

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25What can cause a major difference in surface insolation between two places at the same latitude?

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