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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.

Hard · Level 5 · 25 questions

TOPIC PRACTICE

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  1. Long day increases energy time but high albedo reduces heating
  2. Snow will always absorb all energy
  3. Long day will make oblique rays vertical
  4. Insolation is never received at poles
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  1. Insolation will reach the surface without any loss
  2. Dust and smoke can reduce direct radiation
  3. Sun altitude will turn dust into energy
  4. Smoke will increase day duration
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  1. Evaporation in wet soil uses heat
  2. Dry soil always reflects the Sun
  3. Insolation does not reach wet soil
  4. Black soil always has high albedo
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  1. Consider it maximum only due to vertical rays
  2. Consider it zero only due to short day
  3. Consider both ray intensity and sunshine duration
  4. Treat albedo as day duration
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  1. A white surface can reflect more energy
  2. Absence of clouds makes energy zero
  3. A bright surface shortens the day
  4. The Sun does not shine on white surfaces
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  1. Under strong scattering of radiation
  2. In complete absence of the Sun
  3. When Earth stops rotating
  4. When albedo becomes zero
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  1. Slope aspect gives different insolation
  2. Both slopes receive equal energy
  3. Shade increases day duration
  4. The Sun does not reach valleys
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  1. The Northern Hemisphere is tilted toward the Sun
  2. Distance is the only cause of seasons
  3. The Sun gives more heat when far
  4. Atmosphere creates summer
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  1. Always in the heavily cloudy tropical region
  2. Possibly in the clear-sky desert
  3. Zero at both places
  4. Only over the ocean
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  1. Reflection decreases and absorption increases
  2. Absorption decreases and reflection increases
  3. Day duration will end
  4. Sun altitude will decrease
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  1. Under maritime influence and high moisture
  2. On a dry black surface
  3. In clear desert sky
  4. On land with low water vapour
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  1. Low clouds and low water vapour allow energy gain by day and loss by night
  2. Dense clouds stop temperature day and night
  3. High snow albedo is the main cause
  4. Sea water warms slowly
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  1. Shade and evaporation decrease and asphalt absorbs more energy
  2. Asphalt will reflect all energy
  3. The Sun will stop when forest is removed
  4. The atmosphere will disappear
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  1. Local atmospheric transparency
  2. Change of latitude
  3. Different Sun
  4. Different Earth shape
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  1. High surface albedo
  2. Earth's rotation
  3. Solar constant
  4. Day duration
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  1. Scattering due to more dust or haze
  2. Complete vacuum
  3. Absence of the Sun
  4. Earth being stationary
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  1. Due to high heat capacity and mixing of water
  2. Water always returns all sunlight completely
  3. Energy never reaches water
  4. Water stops day duration
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  1. Lower incoming energy but higher absorption of received energy
  2. Both insolation and absorption are zero
  3. Black surface will create high albedo
  4. Low Sun altitude will double energy
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  1. It is more exposed to the Sun and receives more insolation
  2. It always remains in shade
  3. Sunlight never falls on it
  4. Its albedo is always infinite
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  1. Long day is positive but clouds can reduce energy reaching the surface
  2. Dense clouds always double energy
  3. Long day makes clouds inactive
  4. Insolation will be decided only by day duration
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  1. Insolation and air temperature always increase in the same way
  2. Air temperature can be lower at altitude
  3. Sunlight can feel harsh
  4. Atmospheric obstruction can be lower
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  1. Heat is used in evaporation and transpiration
  2. Grass destroys the Sun
  3. Moisture stops the day
  4. Grass absorbs all energy
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  1. When local angle, clouds, dust, and day duration affect it
  2. When the Sun gives no energy
  3. When Earth does not exist
  4. When no atmospheric effect is possible
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  1. When the surface is high-albedo snow
  2. When the surface is black asphalt
  3. When the surface is dry dark soil
  4. When day is long and surface has low albedo
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  1. Surface albedo, heat capacity, moisture, and altitude
  2. Only the name of the Sun
  3. Only river flow
  4. Only population of the country

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