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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

TOPIC PRACTICE

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  1. Sun rays fall vertically
  2. Sun rays fall obliquely
  3. Sky is fully cloudy
  4. Atmospheric dust is high
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  1. Energy spreads over a larger area and atmospheric path is longer
  2. Solar constant becomes zero
  3. Earth's rotation stops
  4. Ocean currents disappear
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  1. Higher
  2. Lower
  3. Same
  4. Higher only at night
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  1. The distance variation is proportionally small
  2. Atmosphere fixes the distance
  3. Earth's axis becomes vertical
  4. Oceans block solar radiation
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  1. Rays are oblique and days are short
  2. The Sun stops giving energy
  3. The equator shifts northward
  4. Ozone layer blocks all energy
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  1. Dense clouds and high water vapour
  2. Clear sky and dry air
  3. Long day and high Sun
  4. Low dust and high transparency
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  1. Clouds and water vapour are low
  2. Surface moves closer to the Sun
  3. Night duration disappears
  4. Latitude becomes zero everywhere
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  1. Combined effect of duration and angle should be considered
  2. Day length alone is sufficient
  3. Distance alone is sufficient
  4. Nearness to sea alone is sufficient
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  1. Solar angle remains low and ice albedo is high
  2. Sun never rises at poles
  3. Atmosphere is completely absent
  4. Earth's rotation stops
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  1. Absorbed energy will decrease
  2. Absorbed energy will increase
  3. Solar constant will double
  4. Air pressure will become zero
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  1. Dark rocky surface
  2. Fresh snow
  3. Both exactly equal
  4. Only Himalayan snow
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  1. Scattering absorption and reflection increase
  2. Earth's shape changes
  3. Solar brightness permanently decreases
  4. Sea level rises
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  1. They face the Sun at a more favourable angle
  2. They are always below sea level
  3. They have no atmosphere
  4. Their albedo is always one hundred percent
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  1. When the slope is nearly perpendicular to sun rays
  2. When the slope is fully shaded
  3. When the slope has thick snow cover
  4. When air has excessive dust
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  1. Atmospheric path and obstruction are lower
  2. The Sun becomes permanently closer
  3. Gravity creates solar energy
  4. Oceans send radiation
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  1. Clouds reflect and absorb shortwave radiation
  2. Earth moves away from the Sun at noon
  3. Solar angle becomes zero
  4. Latitude changes daily
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  1. It decreases because scattering increases
  2. It increases because dust creates sunlight
  3. It stays same because air has no effect
  4. It increases only at night
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  1. Solar angle remains relatively high throughout the year
  2. Day and night always last for months
  3. Earth's orbit becomes circular there
  4. Atmosphere is absent there
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  1. Nearly vertical rays and longer day length
  2. More clouds and shorter day
  3. Low solar angle and high albedo
  4. Complete night and polar winds
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  1. Southern Hemisphere is tilted toward the Sun
  2. Southern Hemisphere has no atmosphere
  3. Sun is located in the Southern Ocean
  4. Earth's rotation reverses
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  1. Day and night are nearly equal in both hemispheres
  2. Only Northern Hemisphere has day
  3. Sun is vertical at all latitudes
  4. Sun is overhead at poles at noon
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  1. Intensity increases as angle of incidence increases
  2. Intensity is always independent of latitude
  3. Intensity depends only on wind speed
  4. Intensity depends only on ocean depth
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  1. Oblique rays dense clouds high dust
  2. Vertical rays clear sky long day
  3. Low albedo clear air high Sun
  4. Short atmospheric path dry air
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  1. Absorption scattering and reflection
  2. Rotation revolution and tides
  3. Weathering erosion and deposition
  4. Magnetism volcanism and earthquake
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  1. Cloud amount and atmospheric transparency
  2. Name of the country
  3. Time zone boundary
  4. Colour of the map

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