The Atmosphere

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1. stratosphere
2. troposphere
3. thermosphere
4. mesosphere

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1. 29 kms
2. 35 kms
3. 90 kms
4. 45 kms

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1. Zero to 5
2. 2 to 5
3. Zero to 4
4. 1 to 3

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1. The atmospheric vapour is received through the evaporation of moisture and water from the water bodies, vegetation and soil covers of the lithosphere and seas and oceans.
2. Vapour in the atmosphere decreases from the equator towards the poles
3. The moisture content in the atmosphere is responsible for the creation of several forms of condensation and precipitation(clouds, fogs, frost, rainfall, dew, ice, hailstorm, snowfall etc.)
4. Latitudinal trend of distributional pattern of atmospheric vapour does not affects vegetation

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1. scattering
2. refraction
3. diffusion
4. total internal refraction

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1. almost all of the weather events (e.g., fog. cloud, dew, frost, hailstorm, storms, cloud-thunder, lightning etc.) occur in this layer
2. at the upper limit of troposphere temperature becomes - 80°C
3. the height of troposphere changes from equator towards the poles (decreases) and from one season of a year to the other season (increases during summer while it decreases during winter)
4. the average height of the troposphere is about 18 km over the equator and 8 km over the poles

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Options:

1. tropopause
2. mesopause
3. stratopause
4. thermopause

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1. On an average, the upper limit of the stratosphere is taken to be 50 km
2. the upper limit of the stratosphere which is known as stratopause
3. temperature decreases with increasing height in the stratosphere
4. there is concentration of ozone in the lower part of this layer

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1. mesopause
2. thermopause
3. stratopause
4. tropopause

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1. At the upper limit of mesosphere (80 km) temperature becomes - 80°C
2. temperature decreases with increasing height in this layer
3. temperature increases with increasing height in this layer
4. mesosphere extends between 50 km and 80 km

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1. tropopause
2. mesopause
3. stratopause
4. thermopause

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1. 17 th century
2. 18 th century
3. 15 th century
4. 16 th century

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1. parts per million
2. parts per mile
3. parts per minute
4. none of the above

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1. It accounts for the largest percentage of atmospheric gases
2. It is as much active as other constant gases
3. Living organisms cannot use nitrogen directly
4. Animals get nitrogen from the plants and their products by eating them

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1. transfer of atmospheric nitrogen into soils (known as nitrogen fixation)
2. mineralization, nitrification and transfer of nitrogen from soils to plants and animals
3. denitrification and return of nitrogen to the atmosphere
4. all of the above

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1. It is chemically very active
2. It mostly occurs up to the height of 60 km in the lower atmosphere
3. oxygen is produced through the process of photosynthesis by autotrophic green plants of terrestrial ecosystems and byphytoplankton of marine ecosystems
4. green plants produce oxygen during respiration

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1. oxygen
2. ozone
3. carbon dioxide
4. nitrogen

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1. it filters the incoming shortwave solar radiation and absorbs ultraviolet rays
2. protects the earth from becoming too hot
3. ozone is present almost at all altitudes
4. the highest concentration of ozone is between the altitudes of 12km and 35 km in the stratosphere

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1. 1 and 3 are correct.
2. only 1 is correct.
3. 1, 2 and 4 are correct.
4. all are correct.

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1. carbon dioxide helps in the process of photosynthesis
2. carbon dioxide is transparent to incoming shortwave solar radiation but is opaque for outgoing longwave terrestrial radiation
3. the concentration of atmospheric carbon dioxide is gradually increasing due to anthropogenic activities
4. carbon dioxide (an example of variable gas) represents 0.93 per cent of the total atmospheric gases

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Options:

1. troposphere
2. mesosphere
3. thermosphere
4. ozonosphere

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