It is known that the atmosphere is divided into some layers. In which one among the following layers, is the percentage composition of Helium gas maximum?

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Q: 55 (NDA-II/2013)
It is known that the atmosphere is divided into some layers. In which one among the following layers, is the percentage composition of Helium gas maximum?

question_subject: 

Geography

question_exam: 

NDA-II

stats: 

0,21,42,18,11,21,13

keywords: 

{'helium gas maximum': [0, 0, 0, 1], 'atmosphere': [1, 1, 4, 7], 'percentage composition': [0, 0, 0, 1], 'troposphere': [6, 1, 1, 1], 'stratosphere': [1, 0, 1, 0], 'exosphere': [3, 0, 3, 4], 'layers': [5, 2, 1, 10]}

In the Earth`s atmosphere, the percentage composition of different gases varies in each layer. Option 1, the troposphere, is the lowest layer of the atmosphere where weather conditions occur. While there is some presence of helium in the troposphere, it is not the layer where the percentage composition of helium gas is highest.

Option 2, the stratosphere, is the layer above the troposphere. This layer contains the ozone layer and is known for its stable weather conditions. Helium gas is present in the stratosphere, but it is not the layer with the maximum percentage composition of helium.

Option 3, the exosphere, is the outermost layer of the atmosphere. It is the layer where gases become very thin and eventually transition into outer space. The exosphere is known to have the highest concentration of helium gas compared to the other layers. Therefore, option 3 is the correct answer.

Option 4, the ionosphere, is a layer within the atmosphere characterized by the presence of ions and free electrons. While there may be some helium gas present in this layer, it does not have the maximum percentage composition of helium.

Therefore, option 3, the exosphere, is the layer in which the percentage composition of helium gas is the