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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.

Hard · Level 4 · 25 questions

Practice questions

01If a coast receives high insolation but temperature remains moderate, what is the most suitable reason?

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Answer and explanation

02If crops receive less light during a long cloudy spell, the reason is related to what?

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03Which combination is strongest for maximum effect of insolation?

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04Which combination is most suitable for minimum effect of insolation?

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05Why will energy receipt differ at two latitudes under similar atmospheric conditions?

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06If Earth's axis were not tilted, what would be the biggest change in annual insolation variation?

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07In which condition may crop surface not become very hot despite receiving more insolation?

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08If the surface colour of a region is changed to lighter, what effect is expected?

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09Why can a place have high insolation but lower felt temperature?

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10If a question asks the difference between direct and diffuse insolation, what is the correct clue?

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11If a region has much dust, why can insolation decrease even without shade?

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12If a region has long day with high albedo and oblique rays, which factor will reduce heating?

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13In which condition will surface energy gain be highest?

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14Which option includes both atmospheric and surface factors reducing insolation effect?

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15Why will wet grass and dry asphalt heat differently under the same sunlight?

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16In which condition will direct insolation decrease but the sky may still look bright?

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17If the zone of vertical sun rays shifts northward, what change will occur in the Northern Hemisphere?

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18If a region is cold even at perihelion, which conclusion is correct?

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19If water vapour is high in an atmospheric layer, which component of insolation can be affected?

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20If a surface is dark but remains wet, which effects will work together on temperature rise?

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21Why can actual insolation at a place not be stated only by knowing the solar constant?

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22If a place has few clouds but a high-albedo surface, which conclusion is correct?

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23In which condition can the effect of oblique rays be partly balanced by surface absorption?

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24If a region has long day, clear sky, and a water surface, how should final temperature be assessed?

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25What is the best method to avoid wrong conclusions in hard-level insolation questions?

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Answer and explanation

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