In which one of the following layers of the atmosphere all weather phenomenon occur?
- A.Mesosphere
- B.Troposphere
- C.Thermosphere
- D.Stratosphere
Correct answer
Explanation
The correct answer is B, Troposphere. Almost all water vapour and dust of the atmosphere lie in the troposphere, so clouds, rain, storms and other weather events happen there.
The troposphere is the lowest layer, about 8 km thick at the poles and about 18 km at the Equator. Temperature falls with height here at roughly 6.5°C per kilometre, which keeps the air mixing and rising, so convection, condensation and precipitation take place. Its upper boundary is the tropopause. Above it, the stratosphere is calm and dry, which is why jet aircraft prefer to fly in its lower part.
A is wrong because the mesosphere, about 50 to 80 km up, is the coldest layer, where meteors burn up, and has no weather.
C is wrong because the thermosphere contains the ionosphere, which reflects radio waves, and is too thin for weather.
D is wrong because the stratosphere holds the ozone layer and has almost no clouds or weather.
Exam tip: order from the ground – troposphere (weather), stratosphere (ozone), mesosphere (meteors), thermosphere (ionosphere), exosphere.
Practice Questions
View allDoldrum are
1. equatorial calms
2. calm and light winds
3. roaring forties
4. variable both in position and in extent
Select the correct answer using the code given below:
- A.1, 2 and 4
- B.2 and 3 only
- C.1 and 3
- D.2, 3 and 4
Show answer
The doldrums are the equatorial belt of calm and light, variable winds, and the belt shifts with the seasons; they have nothing to do with the roaring forties.
Read the full explanation →Which one of the following Indian cities is not located on a river bank ?
- A.Agra
- B.Bhagalpur
- C.Bhopal
- D.Kanpur
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Bhopal, the capital of Madhya Pradesh, is not built on a river bank; it is known instead as the City of Lakes.
Read the full explanation →Milpa and Ladang are different names for
- A.shifting cultivation.
- B.mixed farming.
- C.truck farming.
- D.plantation agriculture.
Show answer
Milpa is the name for shifting cultivation in Mexico and Central America, and Ladang is its name in Malaysia and Indonesia.
Read the full explanation →The Tetrahedral Hypothesis of the origin of continents and ocean basin was proposed by
- A.F.B. Taylor
- B.Lowthian Green
- C.Alfred Wegener
- D.W.M. Davis
Show answer
The English geologist William Lowthian Green put forward the Tetrahedral Hypothesis in 1875 to explain how continents and ocean basins are arranged.
Read the full explanation →Which one of the following statements is correct?
For the purpose of Census 2011
- A.a person aged seven and above who can both read and write with understanding in any language is treated as a literate
- B.a person aged eight and above who can both read and write with understanding in any language is treated as a literate
- C.a person aged nine and above who can both read and write with understanding in any language is treated as a literate
- D.a person aged ten and above who can both read and write with understanding in any language is treated as a literate
Show answer
In Census 2011, a person aged seven and above who could both read and write with understanding in any language was counted as literate.
Read the full explanation →